Training Manual 42PQ30 Plasma Display PRELIMINARY Advanced Single Scan Troubleshooting 720p 1 NOTICE: ALL INFORMATION CONTAINED WITHIN THIS PACKAGE IS BASED ON PRE-SALES MODEL.
OUTLINE Overview of Topics to be Discussed Section 1 Contact Information, Preliminary Matters, Specifications, Plasma Overview, General Troubleshooting Steps, Disassembly Instructions, Voltage and Signal Distribution Section 2 Circuit Board Operation, Troubleshooting and Alignment of : • Switch mode Power Supply • Y SUS Board • Y Drive Boards (Receives Y Drive signals from Y-SUS PWB) • Z SUS Output Board (Connects directly with FPC to Panel) • Control Board NEW • X Drive Boards (2) • Main Board • Main P
Overview of Topics to be Discussed 42PQ30 Plasma Display Section 1 This Section will cover Contact Information and remind the Technician of Important Safety Precautions for the Customers Safety as well as the Technician and the Equipment. Basic Troubleshooting Techniques which can save time and money sometimes can be overlooked. These techniques will also be presented. This Section will get the Technician familiar with the Disassembly, Identification and Layout of the Plasma Display Panel.
Preliminary Matters (The Fine Print) IMPORTANT SAFETY NOTICE The information in this training manual is intended for use by persons possessing an adequate background in electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major Product, personal injury and property damage can result. The manufacturer or seller maintains no liability for the interpretation of this information, nor can it assume any liability in conjunction with its use.
ESD NOTICE (Electrostatic Static Discharge) Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage the electronics in a manner that renders them inoperative or reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively, you can touch your finger repeatedly to a ground connection point or unpainted metal in the product.
CONTACT INFORMATION Customer Service (and Part Sales) (800) 243-0000 Technical Support (and Part Sales) (800) 847-7597 USA Website (GCSC) Customer Service Website aic.lgservice.com us.lgservice.com LG CS Academy lgcsacademy.com LG Web Training lge.webex.com Published March 2009 by LG Technical Support and Training LG Electronics Alabama, Inc. 201 James Record Road, Huntsville, AL, 35813.
SECTION 1: PLASMA OVERVIEW Safety & Handling Regulations 1. Approximately 10 minute pre-run time is required before any adjustments are performed. 2. Refer to the Voltage Sticker inside the Panel when making adjustments on the Power Supply, Y SUS and Z SUS Boards. Always adjust to the specified voltage level (+/- ½ volt). 3.
Basic Troubleshooting Steps Define, Localize, Isolate and Correct Look at the symptom carefully and determine what circuits could be causing •Define the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material and give off a distinct odor. Frequency of power supplies will change with the load, or listen for relay closing etc. Observation of the front Power LED may give some clues.
42PQ30 Product Information This section of the manual will discuss the specifications of the 42PQ30 Advanced Single Scan Plasma Display Panel.
42PQ30 Specifications 720P PLASMA HDTV 42” Class (41.5” diagonal) • 720p HD Resolution • Dual XD Engine™ • 20,000:1 Contrast Ratio • Fluid Motion • 3x HDMI™ V.1.
42PQ30 Specifications Logo Familiarization 1024 (H) × 768 (V) Actual Pin Count HD RESOLUTION 720p HD Resolution Pixels: 1365 (H) × 768 (V) High definition television is the highest performance segment of the DTV system used in the US. It’s a wide screen, high-resolution video image, coupled with multi-channel, compact-disc quality sound. HDMI (1.3 Deep Color) Digital multi-connectivity HDMI (1.3 Deep color) provides a wider bandwidth (340MHz, 10.2Gbps) than that of HDMI 1.
42PQ30 Specifications Logo Familiarization AV Mode "One click" - Cinema, Sports, Game mode. TAKE IT TO THE EDGE is a true multimedia TV with an AV Mode which allows you to choose from 3 different modes of Cinema, Sports and Game by a single click of a remote control. Clear Voice Clearer dialogue sound Automatically enhances and amplifies the sound of the human voice frequency range to provide high-quality dialogue when background noise swells.
42PQ30 Specifications FluidMotion Familiarization FluidMotion (180 Hz Effect) Enjoy smoother, clearer motion with all types of programming such as sports and action movies. The moving picture resolution give the impression of performance of up to 3x the panels actual refresh rate. PDP 180Hz LCD 60Hz Moving Picture Response Time is 16.5 milliseconds Moving Picture Response Time is 5.44 milliseconds (120Hz takes MPRT to 8.
42PQ30 Remote Control TOP PORTION BOTTOM PORTION 14 Preliminary Information 42PQ30
Rear and Side Input Jacks USB Software Upgrades AC In 15 Preliminary Information 42PQ30
42PQ30 Product Dimensions There must be at least 4 inches of Clearance on all sides Wattage Avg: 181W Stby: 0.13W 40-1/2" 1028.7mm 4-1/8" 104mm 15-3/4" 400mm 12-3/16" 310mm 3-1/8" 78.7mm 15-3/4" 400mm 28-5/16" 718.8mm 15-3/4" 400mm Center 25-13/16" 655.3mm Model No. Serial No. Label 12-13/16" 325mm 5-13/16" 148mm Remove 4 screws to remove stand for wall mount 2-9/16" 65mm Weight without Stand: 50 lb Weight with Stand: 54.7 lb 23-5/8" 600mm 16 12-1/8" 307.
DISASSEMBLY SECTION This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 42PQ30 Advanced Single Scan Plasma Display Panel. Upon completion of this section the Technician will have a better understanding of the disassembly procedures, the layout of the printed circuit boards and be able to identify each board.
42PQ30 Removing the Back Cover To remove the back cover, remove the 26 screws (The Stand does not need to be removed). Indicated by the arrows. PAY CLOSE ATTENTION TO THE TYPE, SIZE AND LENGTH Of the screws when replacing the back cover. Improper type can damage the front.
42PQ30 Circuit Board Layout Y Drive Panel ID Label Panel Voltage Label FPC FPC Power Supply (SMPS) PWB FPC FPC Z-SUS PWB Y SUS PWB FPC FPC FPC Side Input (part of main) Control PWB FPC TCP Heat Sink Main PWB AC In Left “X” Master Power Right “X” Control Keys Invisible Speakers 19 Conductive Tape Under Main PWB Preliminary Information 42PQ30
Disassembly Procedure for Circuit Board Removal Notes: 1) All Plugs listed are from left to right Pin 1,2, 3, ETC. 2) Remember to be cautious of ESD as some semiconductors are CMOS and prone to static failure Switch Mode Power Supply Board Removal Disconnect the following connectors: P811, P813, SC101 Remove the 8 screws holding the PWB in place Remove the PWB When replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label. Confirm VSC, -Vy and ZBias as well.
Disassembly Procedure for Circuit Board Removal (2) Z-SUS Board Removal Disconnect the following connectors: P3, P2. Disconnect the following connectors: P6 and P7. These are the FPC cables. Pull the locking caps to the right. Lift carefully the Flexible Printed Circuits (FPCs) and slide them out to the right. Remove the 5 screws holding the PWB in place Lift the PWB up and remove the PWB. When replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label.
X Drive Circuit Board Removal Continued Lay the Plasma down carefully on a padded surface. Make sure AC is removed and remove the Back Cover and the Stand. Carefully remove the LVDS Cable P121 from the Control Board by pressing the Locking Tabs together and Pull the connector straight back to remove the cable see illustration below. (This prevents possible damage). Press Inward Press Inward LVDS Cable Connector (A) (B) (C) (D) Remove the Stand mount (4 Screws removed during back removal).
Getting to the X Circuit Boards Warning: Never run the TV with the TCP Heat Sink removed B E E Right Left C D Heat Sink B F A Warning Shorting Hazard: Conductive Tape. Do not allow to touch energized circuits.
Left and Right X Drive Removal After removing the back cover, Main PWB is lifted out of the way, 6 screws removed from heat sink covering heat sink and TCPs removed, the X-Drive PWBs can be removed. Showing the tape on the connectors P232 or P331 Peel the tape off the connectors Gently pry the locking mechanism upward and remove the ribbon cable from the connector. Removing TCPs. Carefully lift the TCP ribbon up and off.
TCP (Tape Carrier Package) Generic Removal Precautions Note: These picture are taken from a different model. But the precautions are the same. TCP Connector Removal Lift up the lock as shown by arrows. (The Lock can be easily broken. It needs to be handled carefully.) Pull TCP apart as shown by arrow. (TCP Film can be easily damaged. Handle with care.
Left and Right X Drive Removal Remove the 4 screws for either PWB or 7 total for both.
SECTION 2: CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT ALIGNMENT SECTION 42PQ30 Plasma Display This Section will cover Circuit Operation, Troubleshooting and Alignment of the Power Supply, Y-SUS Board, Y Drive Boards, Z-SUS Board, Control Board, Main Board and the X Drive Boards. At the end of this Section the technician should understand the operation of each circuit board and how to adjust the controls.
42PQ30 SIGNAL and VOLTAGE DISTRIBUTION BLOCK DIAGRAM Display Panel Horizontal Address Reset Y Drive PWB FPCs M5V, Vs, Va P201 Y-SUS PWB P811 P201 SMPS OUTPUT VOLTAGES IN RUN STB +5V, 17V, 12V to Main PWB Vs, Va and M5V to Y-SUS SMPS PWB P202 Floating Ground P203 SMPS OUTPUT VOLTAGES IN STBY STB +5V (AC Voltage Det) SN101 P101 SMPS Relay On Turn On M5 On Commands VS On P813 P203 P103 AC Input Filter P208 P204 Vs and Er Com FPCs Z SUS PWB Vs P3 P206 P102 P205 P7 V Scan P205 P207
Panel Label Explanation (9) (1) (8) (2) (11) (12) (3) (4) (5) (6) (10) (13) (14) (15) (7) (1) Model Name (2) Bar Code (3) Manufacture No. (4) Adjusting Voltage DC, Va, Vs (5) Adjusting Voltage (Set Up / -Vy / Vsc / Ve / Vzb) (6) Trade name of LG Electronics (7) Manufactured date (Year & Month) (8) Warning 29 (9) TUV Approval Mark (10) UL Approval Mark (11) UL Approval No. (12) Model Name (13) Max. Watt (Full White) (14) Max. Volts (15) Max.
ADJUSTMENT NOTICE It is critical that the DC Voltage adjustments be checked when; 1) SMPS, Y-SUS or Z-SUS PWB is replaced.
SWITCH MODE POWER SUPPLY Troubleshooting This Section of the Presentation will cover troubleshooting the Switch Mode Power Supply for the Single Scan Plasma. Upon completion of the section the technician will have a better understanding of the operation of the Power Supply Circuit and will be able to locate voltage and test points needed for troubleshooting and alignments. • • DC Voltages developed on the SMPS Adjustments VA and VS.
Switch Mode Power Supply Part Number SMPS P/N EAY58349601 Check the silk screen label on the top center of the PWB of the Power Supply itself to identify the PWB P/N. We will examine the Operation of this Power Supply.
42PQ30 SMPS PWB LAYOUT (POWER SUPPLY) P811 10 L602 P811 P813 L601 T901 VR502 Va F801 4A/250V Stby 338V Run 388V Hot Ground Hot Ground Both F801 and F302 read from Hot Gnd RL103 F302 RL101 1 Primary Bridge Rectifier 1 Hot Ground M5V M5V Gnd VA VA Gnd Gnd N/C VS VS Hot Ground: Represents a Shock Hazard VR901 Vs IC701 T301 8A/250V AC In SC101 33 17V 2 17V 3 Gnd 4 Gnd 5 12V 6 12V 7 Gnd 8 Gnd 9 5V 10 5V 11 5V 12 5V 13 Gnd 14 Gnd 15 Gnd 16 N/C 17 18 5V Det 19 R
Switch Mode Power Supply Overview The Switch Mode Power Supply Board Outputs to the : Y-SUS Board Main Board VS Drives the Display Panel Horizontal Grid VA Primarily responsible for Display Panel Vertical Grid M5V VCC Used to develop Bias Voltages on the Y-SUS, X Drive, and Control Boards 16V Audio B+ Supply 5V Signal Processing Circuits There are 2 adjustments located on the Power Supply Board VA and VS. The 5V VCC is pre-adjusted and fixed.
Switch Mode Power Supply Circuit Layout P811 To Y-SUS 338V Stby 388V Run Fuse F801 PFC Circuit Main Bridge Rectifier VA Source 380V Source VS Source VS VR901 VA VR502 4Amp/250V 338V Stby 388V Run Fuse F302 STBY 5V 17V, 12V Source 1Amp/250V Main Fuse F101 AC Input SC 101 6.
Power Supply Basic Operation AC Voltage is supplied to the SMPS Board at Connector SC101 from the AC Input Filter. Standby 5V is developed from 90V source supply (which during run measures 359V). This supply is also used to generate all other voltages on the SMPS. The 5V (standby) voltage is routed to the Sub Micon circuit (IC701) on the SMPS and through P813 to the Main PWB for Micon (IC1) operation.
42PQ30 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB M5V Reg 7 In Stand-By Primary side is 90V AC In 1 In Run (Relay On) Primary side is 370V 5 Stand By 5V Reg AC Det. 15 Vs Reg 12 M5V (DC Voltage) Also develops 15V Vs/Va (DC Voltage) Va Reg 12V 5V Det. 2 5 M5V On 6 5V 15V 17V Relay On 5 9 Vs Va 13 Stand By 5V 3 12V/16V Regulators 8 6 7 15 Vs On 5V and 15V From Y-SUS to Vs from Y-SUS 11 15V Turns on Red LED 12V 16V Video Audio 5V Reg 10 2 5 AC Det.
Power Supply Generic Troubleshooting Tips Remember if a voltage is missing check for proper resistance before proceeding Understanding the Power On Sequence when Troubleshooting a possible Power Supply Failure will simplify the process of isolating which circuit board failed to operate properly. In this Section we will investigate the Power on Sequence and examine ways to locate quickly where the failure occurred.
Switch Mode Power Supply Static Test This test can confirm the proper operation of the SMPS without the need to exchange the board. This Power Supply can operate in a No Load State. This means that by applying AC power to SC101 and all other plugs disconnected, this power supply will function. Simply removing P813 (Lower Right Hand Side of the PWB), will cause the “AUTO” Pin 22 to go high from its normal low state allowing the Power Supply to go to full power on mode when AC Power is Supplied.
42PQ30 SMPS (LIGHT BULB) STATIC TEST UNDER LOAD Using two 100 Watt light bulbs, attach on end to Vs and the other end to ground. Apply AC to SC101. If the light bulbs turn on, allow the the SMPS to run for several minutes to be sure it will operate under load. If this test is suscessful and all other voltages are generated, you can be assured the power supply is OK.
Switch Mode Power Supply Static Test (Forcing on the SMPS in stages) P811 and P813 are removed from the Power Supply Remove AC apply the next step and then reapply AC (A) Ground the Auto Ground (Pin 22) on P813 (a) When AC Power is applied, Check AC Det (Pin 18) and 5V Stand-By (Pins 9 ~ 12) are 5V. (B) 100Ω ¼ watt resistor added from 5V STB (Pins 9 ~ 12) to RL ON (Pin 19) closes relay RL101 and RL103 turning on the 17V and 12V Supplies.
SMPS Va and Vs Adjustments Use Full White Raster “White Wash” Pull P813. Apply AC Power. Power Supply Starts Automatically. Va TP P811 Pin 6 or 7 This Power Supply will come up and run with “NO” load on P811. But, check using 200W light bulb test. With P811 in circuit, Y & Z SUS Run. Both Y and Z waveforms are generated. Vs TP P811 Pin 1 or 2 Important: Use the Panel Label Not this book for all voltage adjustments.
SC101 and P811 Pin ID and Voltages Voltage and Resistance Measurements for the SMPS. SC101 AC INPUT Connector Pin Number SC101 Standby Run 120VAC 120VAC 1 and 3 Diode Mode Open P811 CONNECTOR "Power Supply PWB“ to Y-SUS Pin Label STBY Run Diode Mode 1 Vs 0V *194V Open 2 Vs 0V *194V Open 3 Gnd 0V 0V Gnd 4 n/c n/c n/c n/c 5 Gnd 0V 0V Gnd 6 Va 0V *60V Open 7 Va 0V *60V Open 8 Gnd 0V 0V Gnd 9 M5V 0V 5V 2.99V 10 M5V 0V 5V 2.
P813 Odd Pins ID and Voltages Voltage and Diode Mode Measurements for the SMPS (Page 1 of 2) P813 CONNECTOR “SMPS" to “Main PWB" P301 Pin Label STBY Run Diode Mode Pin Label STBY Run Diode Mode 1 17V 0V 17.3V Open 2 17V 0V 17.3V Open 3 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd 5 12V 0V 12V Open 6 12V 0V 12V Open 7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 9 5V 5V 5V 1.1V 10 5V 5V 5V 1.1V 11 5V 5V 5V 1.1V 12 5V 5V 5V 1.
Y-SUS PWB SECTION (Overview) Y-SUS Board develops the Y-Scan to the Y-Drive boards. This Section of the Presentation will cover troubleshooting the Y-SUS Board for the Single Scan Plasma. Upon completion of the Section the technician will have a better understanding of the operation of the circuit and will be able to locate voltage and resistance test points needed for troubleshooting and alignments.
Y-SUS PWB Layout FS202 (Vs) 4A 250V P203, P208, P205 and P207 Plugs into Y-Drive board Pin 1 Y-SUS opposite on Y-Drive Y-Drive board P201 P203 VS, VA and M5V Input from the SMPS SET UP VR 601 P203, P208 and P205 All Floating Ground V SET DN VR 401 VSC TP R520/J263 P208 -VY TP R201 P207 Pins 1 and 2 Y Scan signal P206 P205 Vs to Z-SUS FS203 (Va) 10A FS201(5V) 4A 5V and 15V Floating Gnd 5V Pins 4 and 5 Pins 7, 8, 9, 10 and 11 Logic (Drive) Signals to the Y Drive PWBs P207 P101 c Ribbon VSC
Y-SUS PWB P207 Explained Use the Left Side of C213 to test for Y Scan signal Y-Drive Board Y-SUS Board P104 P207 Pins 1 and 2 Y Scan signal P207 c FL1 P205 c 1. Scan Sig 2. Scan Sig 3. n/c 4. 5V FG 5. 5V FG 6. SUS Dn 7. CLK 8. STB 9. OC1 10. DATA 11. n/c 12.
VSC and -VY Adjustments CAUTION: Use the actual panel label and not the book for exact voltage settings. Y SUSTAIN ADJUSTMENT DETAILS Voltage Reads Positive These are DC level Voltage Adjustments + -Vy -Vy TP R201 VSC Lower Left Side Of PWB -Vy TP VR501 VR502 - Just below Heat Sinks VSC TP R520 / J263 J263 + Vsc TP Set should run for 15 minutes, this is the “Heat Run” mode. Set screen to “White Wash” mode or 100 IRE White input.
Y-Drive Signal Overview Y-Drive PWB Test Point (Top of Y-Drive Board) c Overall signal observed 4mS/div d Highlighted signal from waveform above observed 400uS/div 528V p/p e Highlighted signal from waveforms above observed 100uS/div NOTE: The Waveform Test Point is fragile. If by accident the land is torn and the run lifted, make sure there are no lines left to right in the screen picture. NOTE: The two test points just below and to the left will also work for the Y-Drive waveform Test Point.
Observing (Capturing) the Y-Drive Signal for Vsetup Ramp-Up (RAMP) Set must be in “WHITE WASH” All other DC Voltage adjustments should have already been made. Fig 1: As an example of how to lock in to the Y-Drive Waveform. Fig 1 shows the signal locked in at 4ms per/div. Note the 2 blanking sections. The signal for SET-UP is outlined within the Waveform Outlined Area Blanking Blanking FIG1 4mS Area to be adjusted Fig 2: At 2mSec per/division, the waveform to use for SET-UP Is now becoming clear.
Observing (Capturing) the Y-Drive Signal for Vsetup Ramp-Down Set must be in “WHITE WASH” All other DC Voltage adjustments should have already been made. Fig 1: As an example of how to lock in to the Y-Drive Waveform. Fig 1 shows the signal locked in at 4ms per/div. Note the 2 blanking sections. The signal for SET-DN is outlined within the Waveform Outlined Area Blanking Blanking FIG1 4mS Area to be adjusted Fig 2: At 2mSec per/division, the waveform to use for SET-DN is now becoming clear.
V-Set Up and V-Set Down Adjustments Y SUSTAIN ADJUSTMENT DETAILS (Vs, Va, VSC and –VY must have already been completed). Set in White Wash. Observe the Picture while making these adjustments. Normally, they do not have to be done. Y-Drive PWB Test Point SET-UP ADJUST: 1) Adjust VR601 and set the (A) portion of the signal to match the waveform above. SET-DN ADJUST: 2) Adjust VR401 and set the (B) time of the signal to match the waveform above.
V Set Up Too High or Low Panel Waveform Adjustment The center begins to wash out and arc due to Vset UP Peeking too late and alters the start of the Vset DN phase. Ramp (Vset UP) too high Very little alteration to the picture, the wave form indicates a distorted Vset UP. The peek widens due to the Vset UP peeking too quickly.
V Set Dn Too High or Low Vset Dn swing is Minimum 110uS Max 200uS+ Panel Waveform Adjustment NOTE: If Vset DN too high, this set will go to excessive bright, then shutdown. To correct, remove the LVDS from control PWB and make necessary adjustments. Vset DN too high All of the center washes out due to increased Vset_DN time. Vset DN too low The center begins to wash out and arc due to decreased Vset DN time.
Y SUS Block Diagram Block Diagram of Y-Sustain Board Power Supply Board - SMPS Z-SUS Board Distributes 15V Receive M5V, Va, Vs from SMPS Distributes VA Circuits generate Y Sustain Waveform Left X Board Distributes 15V and 5V Control Board Logic signals needed to generate drive waveform Generates Vsc and -Vy from Vs by DC/DC Converters Also controls Ramp Up/Down FETs amplify Sustain Waveform Y Drive Board Generates Floating Ground 5V by DC/DC Converters Receives Scan Waveform 55 Display Panel
Y-SUS How to Check the Output FETs Name is printed on the components. Readings “In Circuit”. IRFP4332 IRFP4332 IRFP4332 Forward: 0.5V ~ 0.7V Reverse: 1.1V Forward: 0.4V ~ 0.5V Reverse: Open Forward: 1.6V Reverse: Open IRGP4086 IRGP4086 IRGP4086 Forward: 0.6V ~ 0.7V Reverse: 1.3V Forward: 0.39V ~ 0.5V Reverse: Open Forward: 0.6V ~ 0.7V Reverse: 1.3V RF2001 RF2001 RF2001 Forward: Shorted Reverse: Shorted Forward: 0.4V Reverse: Open Forward: 0.38V Reverse: Open 30N45T 30N45T Forward: 0.
Y–SUS P201 to SMPS P812 Plug Information Voltage and Resistance Measurement P201 CONNECTOR "Y-SUS" to "Power Supply PWB" P811 Pin Label STBY Run Diode Mode 1 Vs 0V *193V Open 2 Vs 0V *193V Open 3 NC NC NC NC 4 Gnd Gnd Gnd Gnd 5 Gnd Gnd Gnd Gnd 6 Va 0V *60V Open 7 Va 0V *60V Open 8 Gnd Gnd Gnd Gnd 9 M5V 0V 5V 1.1V 10 M5V 0V 5V 1.1V * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected.
Y-SUS P202 to X Drive P211 and P311 Plug Information Voltage and Diode Mode Measurements for the Y SUS Board P202 CONNECTOR "Y-SUS PWB" to "X-Drive” Left P233 Pin Label STBY Run Diode Mode 1 Gnd Gnd Gnd Gnd 2 Gnd Gnd Gnd Gnd 3 Gnd Gnd Gnd Gnd 4 nc nc nc nc 5 VA 0V *60V Open 6 VA 0V *60V Open 7 VA 0V *60V Open * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode.
Y-SUS P801 to Z Drive P1 Plug Information Voltage and Diode Mode Measurements for the Y SUS Board P206 Connector Y-SUS to Z Drive P1 Plug Information Pin Label STBY Run Diode Mode 1 Er Com 0V * 94.9V Open 2 Er Com 0V *94.9V Open 3 nc nc nc nc 4 Gnd Gnd Gnd Gnd 5 Gnd Gnd Gnd Gnd 6 nc nc nc nc 7 VS 0V *193V Open 8 VS 0V *193V Gnd * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected.
P101 Y-SUS to Control PWB P111 Plug Information Voltage Measurements for the Y SUS Board These connector pins are too close to read without possible damage to the PWB Actually a 30 Pin Connector “Measurements can be made on the Control PWB Y-SUS Board B+ checks for the P101 connector. FS201 5V to run the Control Board. Also sent to the Z-SUS Board. Routed through the Control Board. Leaves the Control Board on P101 pins 10. Standby: 0V Run: 5V Diode Check: 1.1V FS501 15V to run the Z-SUS Board.
Y-SUS P101 to Control P111 Plug Information “Y-SUS" P101 CONNECTOR to “Control PWB" P111 Pin Label STBY Run Diode Mode Pin Label STBY Run Diode Mode 1 Gnd Gnd 0V Gnd 2 n/a 0V 0.12V 0.65V 3 n/a 0V 0.1V 0.65V 4 n/a 0V 0.13V 0.65V 5 n/a 0V 1.28V 0.65V 6 n/a 0V 0.2V 0.65V 7 n/a 0V 0V 0.65V 8 n/a 0V 1.05V 0.65V 9 n/a 0V 0.6V 0.65V 10 n/a 0V 0.17V 0.65V 11 n/a 0V 2.96V 0.65V 12 n/a 0V 2.5V 0.65V 13 n/a 0V 1.4V 0.65V 14 n/a 0V 0V 0.
Y-SUS P207 Voltage Readings All voltages taken from Floating Ground. Warning: Do not hook scope ground up unless set plugged into an isolation transformer. P207 Pin Label Voltage 1) VSC 2) VSC 3) Nc 4) 5V VF 5) 5V VF 6) SUS_DN 7) CLK 8) STB 9) OC1 10) DATA 11) Nc 12) SUS_DN n 62 140V 140V 5V 5V FGnd 0.96V 2.3V 2.
Y-SUS P207 (Drive Output Plug) TESTING P104 OF THE P207 OF THE Y-DRIVE PWB Y-DRIVE PWB c CHECKING THE Y-SUS PWB Disconnected from the Y-DRIVE PWB Readings from Floating Ground (Pin 1) RED LEAD Blk Lead FG Y Drive Sig Y Drive Sig Floating Gnd c Floating Gnd Pin 1 Floating Ground Pin 1 on Y-SUS is backwards compared to Y-Drive 1.) VSC 2.) VSC 3.) nc 4.) FG+5V 5.) FG+5V 6.) SUS Dn 7.) CLK 8.) LE 9.) OC1 10.) Data 11.) nc 12.) SUS Dn BLACK LEAD Red Lead FG Open Open Open 1.78V 1.78V 0V 1.57V 1.
Y-DRIVE PWB SECTION (Y-Drive Explained) Y-Drive Board works as a path supplying the Sustain and Reset waveforms which are made in the Y SUSTAIN PWB and sent to the Panel through SCAN DRIVER IC’s. The Y Drive Boards supply a waveform which selects the horizontal electrodes sequentially. * 42PQ30 uses 8 DRIVER ICs on 1 Y Drive Board Y DRIVE WAVEFORM Y DRIVE WAVEFORM TEST POINT To facilitate scope attachment, solder a small wire (Stand Off) at this point.
Y Drive PWB ID 5 Volts, Y Drive and Logic Signals from Y SUS Board are supplied to the Drive Board on Connectors P104. Y Drive and Logic Signals (Clock and Data) from the Y SUS Board Y Drive Scan Signal Input Y-SUS SIDE P101 TOP Floating Gnd +5V Floating Ground from the Y SUS Board P101, P103, P102 and pins 1 and 7 of P104 P103 PANEL SIDE P102 P104 BOTTOM FL1 Check 5V supply using FL1 or across C18.
Y Drive P207 Voltage Readings All voltages taken from Floating Ground. Pin Label Voltage Warning: Do not hook scope ground up unless set plugged into an isolation transformer. n 66 1) VSC 2) VSC 3) Nc 4) 5V VF 5) 5V VF 6) SUS_DN 7) CLK 8) STB 9) OC1 10) DATA 11) Nc 12) SUS_DN 140V 140V 5V 5V FGnd 0.96V 2.3V 2.
Y-Drive PWB Buffer Troubleshooting CHECKING THE Y-DRIVE PWB Disconnected from the Y-SUS PWB P104 OF THE P207 OF THE Y-DRIVE PWB Y-DRIVE PWB c Readings from Floating Ground (Pin 1) RED LEAD Blk Lead FG Y Drive Sig Y Drive Sig Floating Gnd Floating Gnd 12.) VSC 11.) VSC 10.) nc 9.) FG+5V 8.) FG+5V 7.) SUS Dn 6.) CLK 5.) LE 4.) OC1 3.) Data 2.) nc 1.) SUS Dn BLACK LEAD Red Lead FG 1.15V 1.15V Open 0.4V 0.4V 0V 0.5V 0.5V 0.5V 0.62V 0.48V 0V Open Open Open Open Open 0V 2.9V 2.
Removing (Panel) Flexible Ribbon from Y Drive Flexible Ribbon Cables shown are from a different model, but process is the same. To remove the Ribbon Cable from the connector first carefully lift the Locking Tab from the back and tilt it forward ( lift from under the tab as shown in Fig 1). The locking tab must be standing straight up as shown in Fig 2. Lift up the entire Ribbon Cable gently to release the Tabs on each end. (See Fig 3) Gently slide the Ribbon Cable free from the connector.
Y Drive Flexible Ribbon Incorrectly Seated The Ribbon Cable is clearly improperly seated into the connector. You can tell by observing the linearity. The Locking Tab will offer a greater resistance to closing in the case. Note the cable is crooked. In this case the Tab on the Ribbon cable was improperly seated at the top. This can cause bars, lines, intermittent lines abnormalities in the picture. Remove the ribbon cable and re-seat it correctly.
Y Drive BUFFER Troubleshooting YOU CAN CHECK ALL 8 BUFFER ICs USING THIS PROCEDURE BACK SIDE OF Y-DRIVE PWB Using the “Diode Test” on the DVM, check the pins for shorts or abnormal loads. - + BUFFER IC FLOATING GROUND (FGnd) RED LEAD ON BUFFER IC FGnd Indicated by white outline BLACK LEAD ON “ANY” OUTPUT LUG. READING 0.78 V 128 Output Pins - + BLACK LEAD ON BUFFER IC FGnd Indicated by white outline 43 43 42 RED LEAD ON “ANY” OUTPUT LUG.
Troubleshooting the Z-SUS Drive section of the Y-SUS PWB This Section of the Presentation will cover troubleshooting the Z-Drive section of the Y-Z-SUS Board Assembly. Upon completion of this section the Technician will have a better understanding of the circuit and be able to locate voltage and resistance test points needed for troubleshooting and alignment.
Z-SUS Board Layout No IPMs Read the Label on the back of the upper left hand side of the panel.
Z-SUS Waveform Provides the SUSTAIN PULSE and ERASE PULSE for generating SUSTAIN discharge in the panel by receiving Drive signals from the Y-Z-SUS PWB. Z-SUS PWB This waveform is supplied to the panel through FPC (Flexible Printed Circuit). Z-Bias is a “DC” adjustment. The effects of this adjustment can be observed on the scope looking at the Z-SUS output. Z Drive Waveform Oscilloscope Connection Point. (Vzb) Z Bias VR8 J27 to check Z Output waveform. Right Hand side Center.
VZ (Z-Bias) Adjustment Read the Label on the back of the upper left hand side of the panel. Adjust using VR8. Z Bias VR8 + Bottom Center of Z-SUS Board VZ (Z-Bias) TP Right Side R49 or R50 Set should run for 15 minutes, this is the “Heat Run” mode. Set screen to “White Wash” mode or 100 IRE White input.
Z-SUS Block Diagram Diagram of Z Sustain Board NO IPMs POWER SUPPLY Board Distributes Logic Signals M5V, VA, VS Control Board 5V, 15V 5V, 15V Y-SUS Board VS Z-SUS PWB Receives VS from Y-SUS and 15V, 5V from Control PWB Circuits generate erase, sustain waveforms Generates Z Bias 100V Display Panel FET Makes Drive waveform Via FPC (flexible printed circuit ) 75 Preliminary Information 42PQ30
Z-SUS P3 Connector to Y-SUS P206 Voltages and Resistance Voltage and Diode Mode Measurements P3 CONNECTOR “Z-SUS PWB" to “Y-SUS Out" P206 Pin Label STBY Run Diode Mode 1 ER COM 0V *94.9V Open 2 ER COM 0V *94.9V Open 3 nc nc nc Open 4 Gnd Gnd Gnd Gnd 5 Gnd Gnd Gnd Gnd 6 nc nc nc Open 7 VS 0V *193V Open 8 VS 0V *193V Open * Note: This voltage will vary in accordance with Panel Label Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode.
Z-SUS P2 Connector to Control P101 Voltages and Resistance Voltage and Diode Mode Measurements P2 CONNECTOR “Z-SUS PWB" to “Control" P101 Pin Label STBY Run Diode Mode 1 Z SUS DN 0V 0.79V 2.8V 2 Z SUS UP 0V 0.13V 2.8V 3 Z ER UP 0V 0.19V 2.8V 4 Z ER DN 0V 0.4V 2.8V 5 Z BIAS 0V 1.9V 2.8V 6 OE 0V 0.8V Open 7 CTRL_OE 0V 1.9V Open 8 Gnd Gnd Gnd Gnd 9 Gnd Gnd Gnd Gnd 10 +5V 0V 4.9V Open 11 +15V 0V 16.9V Open 12 +15V 0V 16.
CONTROL PWB SECTION This Section of the Presentation will cover troubleshooting the Control Board Assembly. Upon completion of this section the Technician will have a better understanding of the circuit and be able to locate voltage and resistance test points needed for troubleshooting.
Control PWB Identified To P1002 Main n/c Waveform Generation Software Download Connection P121 P131 LVDS 3.3V 4.8V 5V FL111 FL112 1.8V 0V 0V IC221 IC231 3.3V To P101 Y-SUS 5V P111 IC201 MCM 3.3V P101 IC252 FL204 1V Protect 1) 3.3V 2) 0V 3) 3.3V 4) 0V 5) 3.3V 6) 3.3V 7) 0V 8) 3.3V IC1 Pin 1 EEPROM 3.3V 0V IC211 ROM IC101 1V 3.3V IC1 Part Number Label 5V X101 Crystal 25Meg To P2 Z-SUS AUTO GEN TEST PATTERN P161 D201 Data LED Vs DA 3.
Control PWB Pictorial Note: IC221 (3.
Control PWB Testing For quick PWB test. (All PWB connectors Disconnected). Jump 5V from Power Supply to IC201 Pin 1. (Bottom Pin) If the LED blinks, Pretty much guaranteed, PWB is OK. Confirm B+ to Control PWB VS_DA Control PWB Check 3V ~ 3.3V (Note, this TP can also be Used as an External Trigger For scope when locking onto the Y-Drive signal). Quick observation Of LED blinking Tell if the Control Board is running.
Checking the Crystal X101“Clock” on the Control Board DC Voltage Check 1.5V ~ 1.8V X101 Osc. Check: 25Mhz Check the output of the Oscillator (Crystal). The frequency of the sine wave is 25 MHZ. Missing this clock signal will halt operation of the panel drive signals.
Control LVDS Signals Pins are close together, Use Main PWB side. LVDS Cable P121 on Control PWB shown. Press two outside tabs inward to release. P1002 on Main Board Connector P1002 Configuration - indicates signal pins. 2 1 4 3 6 5 8 7 10 9 12 11 14 13 16 15 18 17 20 19 22 21 24 23 26 25 LVDS Video Signals from the Main Board to the Control Board are referred to as Low Voltage Differential Signals or LVDS.
Control PWB Signal Block The Control Board supplies Video Signals to the TCP (Tape Carrier Package) ICs. If there is a bar defect on the screen, it could be a Control Board problem. Control Board to X Board Address Signal Flow Basic Diagram of Control Board IC201 This Picture shows Signal Flow Distribution to help determine the failure depending on where the it shows on the screen.
Removing the LVDS Cable from the Control PWB The LVDS Cable has two “Interlocks” that must be disengaged to remove the LVDS Cable. To Disengage, press the two Locking Tabs Inward and pull the plug out.
Control PWB Connector P111 to Y-SUS P101 Voltages and Resistance P111 These pins are very close together. When taking Voltage measurements use Caution. Pin c FL111 and FL112 +5V Fuse Pins 1, and 2 Receive +15V from the Y-SUS. The +15V is not used by the Control board, it is routed to the Z-SUS leaving on P101 Pins 11 and 12. Pins 3, 4, 5, 6, and 7 Receive +5V from the Y-SUS.
Control PWB Connector P111 Silkscreen Can Be Misleading P111 The silkscreen indicates the left side is 1~15 and the right side is 16~30, however this is not correct. Use the normal Left Side Odd and Right Side Even pin configuration. Example: Pin c Odd Pins Even Pins Silkscreen Label: The pin numbers are correct. Remember Odd pins on the left and even pins are on the right. 87 Pin d Silkscreen Label: The pin numbers are correct. Remember Odd pins on the left and even pins are on the right.
Control P111 to Y-SUS P101 Plug Information P111 CONNECTOR “Control PWB" to “Y-SUS" P101 Pin Label STBY Run Diode Mode Pin Label STBY Run Diode Mode 1 15V 0V 15V Open 2 15V 0V 15V Open 3 5V 0V 5V 0.97V 4 5V 0V 5V 0.97V 5 5V 0V 5V 0.97V 6 5V 0V 5V 0.97V 7 5V 0V 5V 0.97V 8 Gnd Gnd Gnd Gnd 9 Gnd Gnd Gnd Gnd 10 Gnd Gnd Gnd Gnd 11 Gnd Gnd Gnd Gnd 12 Dummy 2 0V 2.16V 2.8V 13 OE 0V 0V Open 14 OC2 0V 1.89V 2.8V 15 SUS-DN 0V 0V 2.
Control P101 to Z-SUS P2 Plug Information Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. P101 CONNECTOR “Control PWB" to “Z-SUS" P2 Pin Label STBY Run Diode Mode 1 Z SUS Dn 0V 0.75V Open 2 Z SUS Up 0V 0.18V 0.65V 3 Z ER Up 0V 0.16V 0.65V 4 Z ER Dn 0V 0.3V 0.65V 5 Z Bias 0V 2V 0.65V 6 OE 0V 0.07V 0.65V 7 CTRL_OE 0V 0.06V 0.65V 8 Gnd Gnd Gnd Gnd 9 Gnd Gnd Gnd Gnd 10 5V 0V 4.9V 0.
Control PWB Connector P161 and P162 to X-Drive PWBs P161 and P162 Connectors from the "Control PWB" to "X Drive These pins are covered with tape for transportation issues. (Tape can be removed). P162 P161 Tape removed 3.3V TP 3.3V TP 3.3V TP 3.3V created by IC221 90 The rest of the pins are much too close together for a safe test.
Left and Right X Drive (Commonly known as A-BUS) The X Drive PWBs deliver the Color drive signals to the Vertical Grids. The 42PQ30 has a Left and a Right X-Drive board. Each with 6 connectors to a TCP. And each TCP with 2 buffers. Each buffer controls 128 vertical grids lines. Generally speaking, there isn’t many active components on the X-Drive PWBs (Printed Circuit Boards). So they are not prone to failure.
Left and Right X Drive (Commonly known as A-BUS) Warning: DO NOT attempt to run the set with the Heat Sink over the TCPs removed. After a very short time, these ICs will begin to self destruct due to overheating.
TCP (Tape Carrier Package) X Drive TCP ICs supply RGB 16 bit signal to the PDP by connecting the PAD Electrode of the PANEL with the X Board.
+ TCP Testing On any Gnd Typical Reading 0.65V 10,11,12,13,14,27,28,2 9,30,37,38,39,40,41 - On any Va Reverse leads Reading Open 4,5,6,7,44,45,46,47 Va Gnd 1 5 10 15 Look for any TCPs being discolored. Ribbon Damage.
TCP 3.3V B+ Check Checking IC221 for 3.3V, use center pin. IC221 5V 3.3V 0V Warning: DO NOT attempt to run the set with the Heat Sink over the TCPs removed. 3.3V Check for 3.3V Check for 3.3V P232 P331 Top C231 Top C363 Left C307 Left C206 3.3V in on Pins 49-50-51 Left X PWB Right X PWB 95 3.
TCP Visual Observation. Damaged TCP Warning: DO NOT attempt to run the set with the Heat Sink over the TCPs removed. After a very short time, these ICs will begin to self destruct due to overheating.
X Drive Left Connector P211 Voltages and Resistance Voltage and Diode Mode Measurements for the X Drive Board P211 CONNECTOR "X Drive Left" to "X-Drive Right" P311 Pin Label STBY Run Diode Mode 1 Gnd 0V Gnd Gnd 2 Gnd 0V Gnd Gnd 3 15V 0V 15.4V Open 4 n/c 0V n/a n/a 5 n/c 0V n/a n/a 6 VPP/ER1 0V *61.4V Open 7 VPP/ER1 0V *61.4V Open 8 VA 0V *64.
X Drive Right Connector P311 Voltages and Resistance Voltage and Diode Mode Measurements for the X Drive Board P311 CONNECTOR "X Drive Right" to "X-Drive Left" P211 Pin Label STBY Run Diode Mode 1 Gnd Gnd Gnd Gnd 2 Gnd Gnd Gnd Gnd 3 15V 0V 15V Open 4 n/c 0V n/a n/a 5 n/c 0V n/a n/a 6 VPP/ER2 0V *61.4V Open 7 VPP/ER2 0V *61.4V Open 8 VA 0V *64.
X Drive Left and Right Connector P232 and P331 Voltage and Diode Mode Measurements for the X Drive Board Voltage and Diode Mode Measurements for these connectors are difficult to read. They are too close together for safe test. The pins are also protected by a layer of tape to prevent the tab from being released causing separation from the Cable and the connector.
Main PWB Troubleshooting This Section of the Presentation will cover troubleshooting the Main Board. Upon completion of this Section the technician will have a better understanding of the operation of the circuit and will be able to locate voltage and resistance test points needed for troubleshooting and alignments. • • DC Voltage and Waveform Checks Resistance Measurements Operating Voltages SMPS Supplied 5V Stand-By 12V 16V Developed on the Main Board 5V 3.3V (2) 2.5V 1.
Main PWB Layout and Identification LVDS (Video) To Control To Power Supply P301 P1001 P1002 IC203 IC503 USB IC302 To Front Controls IC204 Reset SW100 IC1 X1 12 Mhz Micro.
Main PWB Back Side (Regulator Checks) 1) 0.6V 2) 1.8V 3) 3.3V 1) 0V 2) 3.3V 3) 5V IC304 IC201 IC502 IC201 1,2) 3.4V 3) 0V 4) 3.4V 5,6,7,8) 0V IC305 1) 0.2V 2) 1.2V 3) 3.2V IC506 1) 3.
Main PWB (Regulator Checks) 103 Preliminary Information 42PQ30
Main PWB Tuner Check (Shield Off) Pins Exposed TU1001 Video Pin 19 Video Test Point SIF Pin 16 Audio Test Point Pin 15 Tuner B+ (5V) DIG IF (-) Pin 13 DIG IF (+) Pin 12 Digital Channel Test Point Data Pin 9 Clock Pin 8 Pin 4 Tuner B+ (5V) MAIN PWB Pin 1 Tuner Location 104 Preliminary Information 42PQ30
Main PWB Tuner Video and SIF Output Check Note: “Video Out” Signal only when receiving an analog Channel. USING COLOR BAR SIGNAL INPUT 2.24Vp/p Pin 19 “Video” Signal MAIN PWB Tuner Location Pin 1 500mV / 10uSec Pin 16 “SIF” Signal 450mVp/p Pin 12 and Pin 13 “Dig IF” Signal 700mVp/p 200mV / 2uSec Note: “Dig IF” Signal only when receiving a Digital Channel.
Main PWB Crystal X1 and X501 Check X1 (1.5V DC) / (2.4V p/p) 12Mhz Runs all the time X1 X501 (1.5V DC) / (110mV p/p) 25Mhz X501 MAIN PWB Crystal Location Runs only at first turn on when LD501 is illuminated.
Main PWB P1002 LVDS Video Signal Check USING GRAY SCALE SIGNAL INPUT Pin 11 10uSec per/Div Pin 11 2uSec per/Div Pin 1 P1002 Location Pin 18 10uSec per/Div MAIN PWB Pin 18 2uSec per/Div 700mVp/p 107 Preliminary Information 42PQ30
Main PWB Plug P1002 “LVDS” Resistance Voltage and Resistance Measurements for the Main Board Pin c P1002 CONNECTOR "Main" Odd Pins to P121 "Control PWB" P1002 CONNECTOR "Main" Even Pins to P121 "Control PWB" Pin SBY Run Diode Mode Pin SBY Run Diode Mode 1 0V 0V Open 2 0V 0V Open 3 0V 3.29V 2.49V 4 0V 3.28V 2.49V 5 Gnd Gnd Gnd 6 Gnd Gnd Gnd 7 Gnd Gnd Gnd 8 Gnd Gnd Gnd 9 0V 3.29V 2.49V 10 0V 3.29V 2.44V 11 0V 1.25V 0.85V 12 0V 1.21V 0.77V 13 0V 1.
Main PWB Plug P1001 to Ft Keys Voltages and Resistance Pin c Voltage and Diode Mode Measurements for the Main Board P1001 CONNECTOR "MAIN PWB" to "Front Keys" Stand By 5V Pin Label STBY Run Diode Mode 1 IR 5V 5V 3.17V 2 Gnd Gnd Gnd Gnd 3 Key1 3.29V 3.29V 1.85V 4 Key2 3.29V 3.29V 1.85V 5 P Key 0V *(5V) 0V Open 6 Gnd Gnd Gnd Gnd 7 EYE-SCL 0V 3.28V 2.49V 8 EYE-SDA 0V 3.28V 2.49V 9 Gnd Gnd Gnd Gnd 10 5VST 5V 5V 1.06V 11 3.3VST 0V 5.13V 1.
Main PWB Plug P301 to Power Supply Voltages “Odd Pins” P301 Voltage and Diode Mode Measurements P301 CONNECTOR "Main" to "SMPS PWB" P813 Pin c front Pin Label STBY Run Diode Mode Pin Label STBY Run Diode Mode 1 17V 0V 17.3V Open 2 17V 0V 17.3V Open 3 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd 5 12V 0V 12V Open 6 12V 0V 12V Open 7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 9 5V 5V 5V 1.1V 10 5V 5V 5V 1.1V 11 5V 5V 5V 1.1V 12 5V 5V 5V 1.
Main PWB Speaker Plug P1005 Voltages and Resistance Voltage and Diode Mode Measurements for the Main Board Speaker Plug P1005 CONNECTOR "Main" to "Speakers" Pin Label SBY Run Diode Mode 1 R+ 0V 8.65V Open 2 R- 0V 8.65V Open 3 L+ 0V 8.65V Open 4 L- 0V 8.65V Open P1005 Speaker Connector Board Location MAIN PWB Resistance Readings with the PWB Disconnected. DVM in the Diode mode.
Ft Control PWB and Power LED (IR) PWB Removal The Control Switch PWB and Power Switch PWB are located (as viewed from the rear) in the lower left hand section. REMOVAL: Remove the 2 screws and unplug the connector P101. Then remove the 2 screws from the Front IR and Power LED PWB. Remove J1connector. FRONT KEY PWB NEW: Master Power Switch Set will not function With this Mechanical” switch down in the open position.
Ft Power LED (IR) PWB Layout The Ft Power LED PWB includes the IR Receiver and the Intelligent Sensor. The Front POWER LED is also located on this board.
Front LED PWB Plug J1 to Main Voltages and Resistance Voltage and Diode Mode Measurements for the Main Board J1 CONNECTOR "MAIN PWB" to "Front Keys" Stand By 5V Pin Label STBY Run Diode Mode 1 IR 5V 5V 3.2V 2 Gnd Gnd Gnd Gnd 3 Key1 3.29V 3.29V 1.6V 4 Key2 3.29V 3.29V 1.6V *5 P Key 0V *(5V) 0V Open 6 Gnd Gnd Gnd Gnd 7 EYE-SCL 0V 3.28V 2.5V 8 EYE-SDA 0V 3.28V 2.5V 9 Gnd Gnd Gnd Gnd 10 5VST 5V 5V 1.06V 11 3.3VST 0V 5.13V 1.
Front LED PWB Plug J2 to Key PWB Voltages and Resistance Voltage and Diode Mode Measurements for the Main Board *STBY1 Main Power Switch “OUT” J2 CONNECTOR “Ft LED PWB" to "Ft Keys" Pin *STBY1 *STBY2 Run Diode Mode 1 0V 3.29V 3.29V Open 2 0V 3.29V 3.29V Open 3 4.38V Gnd 0V Gnd 4 Gnd Gnd Gnd Gnd J2 Pin c *STBY2 Main Power Switch “IN” Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode.
Front Key PWB Layout The Ft Key PWB contains the Master Power Switch, Volume Up/Down and Channel Up/Down keys. Also the Menu and Select keys.
Front LED PWB Plug P101 to Ft LED PWB Voltages and Resistance Voltage and Diode Mode Measurements for the Main Board *STBY1 Main Power Switch “OUT” P101 CONNECTOR “Ft Key PWB" to "Ft LED" Pin *STBY1 *STBY2 Run Diode Mode 1 0V 3.29V 3.29V Open 2 0V 3.29V 3.29V Open 3 4.38V Gnd Gnd Open 4 Gnd Gnd Gnd Gnd P101 Pin c *STBY2 Main Power Switch “IN” Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode.
Invisible Speakers Section The Invisible Speaker System keeps the speaker grills off the front of the TV. The speakers actually point downward. Bottom of TV Speaker Housing Housing Screw The picture above shows the additional “plastic support” Housing Under the speaker. Screw Bottom of TV Cushion Speaker Diode Mode Readings taken with all connectors Disconnected. DVM in Diode Mode. Cushion At the top of the speaker is a rubber cushion.
11 X 17 Foldout Section This section shows the 11X17 foldout that’s available in the Paper and Adobe version of the Training Manual.
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42PQ30 CIRCUIT INTERCONNECT DIAGRAM P813 V Set-Up (Ramp) P811 4mS A M5 (9,10) Va (6,7) 0V VR401 B P201 Y-SUS and P811 SMPS 50VAC rms 100uS 528V P/P Connect Scope between Waveform TP on Y-Drive and Gnd Use RMS information just to check for board activity.
Connector P1002 Configuration - indicates signal pins.
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End of Presentation This concludes the Presentation Thank You 123 Preliminary Information 42PQ20
