High-Definition LCD TV Service Manual Models: LT3200, LT3700, LT4200, LT4700
Copyright 2007 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. Microsoft and Windows are trademarks of Microsoft Corporation in the U.S. and other countries. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services.
Table of Contents Important Service Safety Precautions ................................................................................................................. 1 Warnings and Cautions.................................................................................................................................... 1 Safe Handling and Servicing ............................................................................................................................. 2 Repair Tips .................
Four Models – Comparison Pictures ...................................................................................................................42 LT3200 ......................................................................................................................................................42 LT3700.......................................................................................................................................................42 LT4200 .................................
LED Display abnormal................................................................................................................................. 84 LCD Panel Troubleshooting Tips ........................................................................................................................ 84 Inverter board ............................................................................................................................................ 84 Control board (panel driver).................
Important Service Safety Precautions BEFORE SERVICING THE LCD MODULE, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. WHEN REPLACEMENT PARTS ARE REQUIRED, BE SURE TO USE REPLACEMENT PARTS SPECIFIED BY THE MANUFACTURER. Proper service and repair is important to the safe, reliable operation of all HP equipment. The service procedures recommended by HP and described in this service manual are effective methods of performing service operations.
• The LCD module uses a high-voltage (maximum WARNINGS: Safety regulations require that after a repair the set must be returned in its original condition. In particular attention should be paid to the following points: NOTE: The wiring should be routed correctly and fixed with the mounted cable clamps. The insulation of the main leads should be checked for external damage. • Do not touch the signal and the power connector while this product is operating.
• Be sure to handle the circuit board by holding the large parts such as the heat sink or transformer. Failure to observe this precaution may result in the occurrence of an abnormality in the soldered areas. • Do not stack the circuit boards. Failure to observe this precaution may result in problems resulting from scratches on the parts, the deformation of parts, and short-circuits due to residual electric charge.
• Special information for Pb-free BGA-ICs: These ICs will be delivered in so-called dry-packaging to protect the IC against moisture and with the Pb-free logo on it. This packaging may only be opened shortly before it is used (soldered). Otherwise the body of the IC gets wet inside, and during the heating time the structure of the IC will be destroyed from steam pressure. If the packaging was opened before usage the IC has to be heated up for about 90 hours to dry.
Attachment of SMDs 1 Locate the SMD on the solder lands by means of tweezers and solder the component on one side. Ensure that the component is positioned correctly on the solder lands (A). 2 Complete the soldering of the terminals of the component (B). Rework on Ball Grid Array (BGA) ICs General information Although (LF) BGA assembly yields are very high, there may still be a requirement for component rework.
Product Information and Specifications Product Information This specification table describes the key areas of all hardware service requirements of large entertainment HighDefinition LCD Television models LT3200, LT3700, LT4200, and LT4700. This document is for HP service personnel (bench and in-home technicians) and ASP technicians in the repair and refurbishment of HP flat-panel televisions.
General TV Specifications LT3200 and LT3700 Model number LT3200 LT3700 Description 32” HDTV 37” HDTV Availability June 2007 June 2007 Brightness 500 cd/m2 500 cd/m2 Resolution 1366 x 768 1366 x 768 Contrast Ratio 1200:1 1000:1 Viewing Angle 176 degrees 178 degrees Response Time 8 ms 6 ms Scalar Trident PX66 Trident PX66 Supported Input 480i, 480p, 720p, 1080i, 1080p (HDMI only) 480i, 480p, 720p, 1080i, 1080p (HDMI only) ATSC/NTSC/Clear -QAM 1 1 Unidirectional Cable Card No
General TV Specification Continued Model number Convenience Finish and Color Accessories General Regulatory compliance 8 LT3200 LT3700 OSD Languages English/French/Spanish English/French/Spanish Custom Input Presets Yes Yes Custom Input Labeling Yes Yes V-Chip Yes Yes Closed Captioning Yes Yes Sleep Timer Yes Yes Favorite Channels Yes Yes PIP/POP No No Split Screen No No Clock No No Auto On No No EPG TV Guide Support No TV Guide No TV Guide Bezel and Stand 40%-6
General TV Specifications LT4200 and LT4700 Model number LT4200 LT4700 Description 42” HDTV 47” HDTV Availability (On Ad) June 2007 June 2007 Brightness 500 cd/m2 500 cd/m2 Resolution 1920 x 1080 1920 x 1080 Contrast Ratio 1200:1 1200:1 Viewing Angle 176 degrees 176 degrees Response Time 8 ms 6.
General TV Specification Continued Model number Convenience Finish and Color Accessories General Regulatory compliance 10 LT4200 LT4700 OSD Languages English/French/Spanish English/French/Spanish Custom Input Presets Yes Yes Custom Input Labeling Yes Yes V-Chip Yes Yes Closed Captioning Yes Yes Sleep Timer Yes Yes Favorite Channels Yes Yes PIP/POP No No Split Screen No No Clock No No Auto On No No EPG TV Guide Support No TV Guide No TV Guide Bezel and Stand 40%-
I/O Connectors Name Description HDMI Digital High Definition Input Video Input Connector with HDCP — Type A • HDMI 1 (with HDMI audio in L and R) • HDMI 2 • HDMI 3 Audio L and R must be set to PCM at the source across HDMI.
Controlling the Onscreen Display The onscreen display (OSD) is controlled by using the remote control or the bezel buttons on the left side of the TV. The TV indicators (A and B) are located on the front of the TV. TV Indicators and Controls POWER Power button turns on the TV or places it in standby mode. MENU Menu displays the onscreen display (OSD) or closes the OSD menu. SELECT SELECT starts the Auto Sync function for a connected PC signal. In an OSD menu, selects the highlighted item in the OSD.
Remote Control (IR protocol: RC6) Remote control Remote control button label Remote control function Power Use to turn power on or place TV into standby mode. SAP/MTS Turn secondary audio program on and off. Sound Select audio mode: Voice, Music, Standard, User. Picture Select video mode: Vivid, Standard, Movie, or User. Source Display list of input source. Menu Open and exit OSD menu.
TV Connectors The connectors listed in the table following the images are located on the right and left sides and back of the TV. While only one model is shown below, all four models (LT3200, LT3700, LT4200, LT4700) use the same connector configurations.
HP High-Definition LCD TV Service Manual 15
16 HP High-Definition LCD TV Service Manual
Connectors AV Input You can connect two sources of AV (audio/video) input simultaneously. The left column of ports is for Source 1 and the right column of ports is for Source 2. Each set consists of four ports: • The yellow ports labeled Video connect single-channel composite video, which provides a sharper image than a coaxial RF connection. • The adjacent red and white input ports labeled Audio connect the stereo audio soundtrack corresponding to composite or S-Video connections.
Component video cables transmit video in three channels—Y, Pb, and Pr. Some cables are five-headed with three channels of video and two of audio, whereas others are three-headed and require a separate stereo audio cable. The cables are connected as follows: • • • • • The green port labeled Y connects to the cable carrying the Y signal. The blue port labeled Pb connects to the cable carrying the Pb signal. The red port labeled Pr connects to the cable carrying the Pr signal.
HDMI devices are usually HDTV receivers or DVD players. They connect using a single cable with a multipin connector. These TVs have three HDMI ports, so up to three HDMI devices can be connected at the same time. The HDMI 1 port additionally supports separate HDMI audio. This configuration requires a DVI-to-HDMI converter that connects a DVI cable from optional DVI equipment and connects to the HDMI audio in ports using a pair of stereo audio connectors.
Basic Operation Basic Operation For more information about using your HP LCD TV, refer to the HP HD LCD TV User’s Guide included with your TV. There are two menus available – a customer-based menu (Simplemenu) and an advanced menu (Fullmenu). Simplemenu is the default setting. Default selections are shown in bold.
OSD Functions – Fullmenu To access Fullmenu, select SETUP > Caption. Note that Caption Menu is only valid when current input selection is either TV, AV1/S-Video, or Component. Otherwise, caption menu will be disabled. Press the following remote keys: MTS > 7 > 0 > 4. To return to Simplemenu, select Simplemenu from Fullmenu.
Audio Speaker Channel Channel Scan Parental Channel List Signal Strength Change Password Lock Enable MPAA US TV Rating Canadian English Canadian French Setup Time On Off Air Cable Show/Hide channel On Off G PG PG-13 R NC-17 X Not Rated FV, V, S, L, D TV-Y TV-Y7 TV-G TV-PG TV-14 TV-MA E C C8+ G PG 14+ 18+ E G 8 ans+ 13 ans+ 16 ans+ 18 ans+ Clock Mode Clock Set Time Zone 22 HP High-Definition LCD TV Service Manual Auto Manual Month, Day, YR, Hr.
Setup (cont) Time (cont) Daylight Saving Sleep Timer Caption Mode Service Analog Service Digital Style On Off Off 15 min 30 min 60 min 120 min 150 min On Off On Mute CC1 CC2 CC3 CC4 Text1 Text2 Text3 Text4 Service1 Service2 Service3 Service4 Service5 Service6 Font Size Font Style Foreground Color Background Color Active for "Auto".
Setup (cont) Caption (cont) Style (cont) Background Color (cont) Foreground Opacity Background Opacity Edge Style OSD Language English Spanish French Setup Wizard [ Start ] Input Labels AV1 AV2 Component 1 Component 2 HDMI 1 HDMI 2 HDMI 3 VGA Default Settings [ Reset ] SimpleMenu™ 24 HP High-Definition LCD TV Service Manual Default AVR DVD PVR CABLE DEC AUX SAT VCR Blue Yellow Magenta Cyan Default Solid Translucent Transparent Flashing Default Solid Translucent Transparent Flashing Default Edge
Command Table RS232 COMMAND: 3 bytes PARAMETER: 4 byte CR (Carriage Return) at the end of string “OK” + CR: success “ERR” + CR: fail 20 Remote Commands Over RS232c Port Set the RS-232c communications settings on the PC to match the TV’s communication conditions.
Control Item Position Command Parameter H-Position H P O S * * * _ PC mode (0–100) V-Position V P O S * * * _ PC mode (0–100) Clock C L C K * * * _ ONLY PC mode (0–100) Phase Aspect P H S E * * * _ ONLY PC mode (0–100) A S P T 0 _ _ _ Auto mode Mute M U T E Dolby Virtual A C D V Audio Selection A C H A Sleep Timer Channel Control Contents O F T M 1 _ _ _ 16:9 mode 2 _ _ _ 4:3 mode 3 _ _ _ Zoom1 mode 4 _ _ _ Zoom2 mo
Control Item Command CC operation C L Parameter C P 0 Control Contents _ _ _ CC off 1 _ _ _ CC on 2 _ _ _ CC Mute Brightness B R T N * * * _ Brightness (0–100) Contrast C T R T * * * _ Contrast (0–100) Color C L O R * * * _ Color (0–100) Hue H U E E * * * _ Hue (0–100) Sharpness S H R P * * * _ Sharpness (0–100) Color temperature C T E P 0 _ _ _ Warm 1 _ _ _ Normal Blue screen B L S C 2 _ _ _ Cold 0 _ _ _ O
Control Item Command Set time mode S Set time Set time year S T T Parameter M T D Y Control Contents 0 _ _ _ Auto 1 _ _ _ Manual * * * * Year, if time mode is manual (1990~2037) Set time month S T T M * * _ _ Month, if time mode is manual Set time day S T T D * * _ _ Day, if time mode is manual Set time hour S T T H * * _ _ Hour, if time mode is manual Set time minute S T T I * * _ _ Minute, if time mode is manual (01~12) (01~31) (00~23) (
Control Item Command Select digital CC service S Select OSD language All screen white mode Standby mode PWR MANAGE S S S P D O R B M Parameter C L W M G S G M D Control Contents 1 _ _ _ Select a certain service 1 2 _ _ _ Service 2 3 _ _ _ Service 3 4 _ _ _ Service 4 5 _ _ _ Service 5 6 _ _ _ Service 6 0 _ _ _ English 1 _ _ _ French 2 _ _ _ Spanish 0 _ _ _ Off 1 _ _ _ On 0 _ _ _ Slow Boot mode 1 _ _ _ Fast Boot mode * _
Control Item Command REMOTE CON MODE R C Parameter M * _ _ Control Contents _ REMOTE ACTIVE 0 = PC. 1 = Remote control. 2 = Enable both PC and remote (Default). START CHANNEL S T C * * * _ SELECT (Analog Channel) Channel a Power ON. 1-125=channel 1-125. 126=map to Ch3. 127=map to Ch4. 255=tune to last channel before turn power OFF.
Return messages For every command, TV should return reply. Controller waits before sending another command because some commands take time before TV is ready to accept next command. For example, the “channel scan” command takes minutes.
Replaceable Parts This chapter contains the service parts lists of each model. Parts List by Model To see the pictures of the replaceable parts, go to the “Replacement Parts List Reference Picture” section. Model LT3200 Picture Number Part Description OEM Part Numbers 60.3YI02.
Model LT3700 To see the pictures of the replaceable parts, go to the “Replacement Parts List Reference Picture” section. Picture Number Part Description OEM Part Number 60.3YG11.001 HP Part Number 452085-001 1 Stand base 2 Stand neck assy Stand neck Repair screw kit Power supply assy - For 3x models -230W Power supply - 3x model Main board to power supply cable Main board assy Main board Main board to power supply cable Back cover - bucket 91.3YW10.002G 50.3YJ02.001 60.3YI07.
Model LT4200 To see the pictures of the replaceable parts, go to the “Replacement Parts List Reference Picture” section. Picture Number Part Description OEM Part Number 60.3YJ17.001 HP Part Number 452086-001 1 Stand base 2 Stand neck assy Stand neck Repair screw kit Power supply assy - For 4x models -338W Power Supply - 4x model System board to power supply cable Main board assy Main board System board to power supply cable Back cover - bucket 91.3YW10.003G 50.3YJ02.001 60.3YJ05.
Model LT4700 To see the pictures of the replaceable parts, go to the “Replacement Parts List Reference Picture” section. Picture Number Part Description OEM Part Number 60.3YK13.001 HP Part Number 452087-001 1 Stand base 2 Stand neck assy Stand neck Repair screw kit Power supply assy - For 4x models -338W Power supply - 4x model System board to power supply cable Main board assy Main board System board to power supply cable Back cover - bucket 91.3YW10.003G 50.3YJ02.001 60.3YK04.
Replacement Parts List Reference Pictures Note: Not every individual part for every model is shown here. However, you can use the pictures as a reference for all models.
Picture Reference Number Picture of Replacement Part 4 5 6 7 HP High-Definition LCD TV Service Manual 37
Picture Reference Number Picture of Replacement Part 8 9 10 11 38 HP High-Definition LCD TV Service Manual
Picture Reference Number Picture of Replacement Part LT3200 LT3700 LT4200 12 LT4700 Note: 37”, 42”, 47” models will include two inverter boards. Only one inverter board is shown for each model.
Picture Reference Number Picture of Replacement Part LT3200 LT3700 13 LT4200 40 HP High-Definition LCD TV Service Manual LT4700
Removal and Replacement This section includes information about disassembling the LCD TV for service. Equipment and Tools Needed for Removal and Replacement Tools • • • • • #1 and #2 magnetic Philips screwdriver with 6-inch shaft, no greater than 3/8-inch in diameter 3/16-inch hex driver 5/8-inch hex driver ESD protect gloves ESD protect wristband Note: An HDMI to DVI converter is for use on notebook computers with DVI connectors.
Four Models – Comparison Pictures This section provides pictures of each TV model with the rear cover removed. Use these images to familiarize yourself with each TV and its associated parts.
LT4200 LT4700 HP High-Definition LCD TV Service Manual 43
Removal Procedures Included in this section are the following procedures and illustrations: • • • • • • • • • • • • • • • Removing the TV Pedestal Disassembling the Pedestal Removing the Back Cover Removing the Function Keyboard Installing the Keyboard PCA Removing the Infrared Board Removing the Wall Mount Bracket Removing the Board Cover Removing the Main Board Removing the Power Supply Removing the Main Bracket Removing the Inverters Removing the Speakers Removing the Control Board Removing the Front B
Removing the Pedestal 1 Carefully place the TV with the glass screen facing downward on a padded, stable table. 2 Position the bottom of the TV near the edge of the table so the pedestal hangs off the edge of the table. 3 Remove the four screws. 4 Carefully lift the pedestal off the TV.
Disassembling the Pedestal 1 Position the pedestal so you can access the screws from the bottom of the pedestal. 2 Remove the four screws that hold the two pieces of the pedestal together. Note: Hole usage varies depending on model. Model LT3200/LT3700 shown 3 Separate the two pieces of the pedestal.
Removing the Back Cover 1 Remove the thirteen screws as shown. Note: Screws 9, 10, 11, 12, and 13 are sheet metal screws. During reassembly, make sure you return these sheet metal screws to their proper location. Note: The 47-inch model has two extra screws (total of 15), one on each side toward the bottom of the unit. 2 On all sides of the unit, press the side of the back cover inward to release it from the inner latches.
3 Carefully lift the back cover straight up off the unit. Removing the Function Keyboard Lift the function keyboard from the slot and detach the cable from the connector.
Installing the PCA into the Keyboard The keyboard PCA may not come installed into the keyboard. If not installed, use the following procedure to install: 1 Make sure the connector on the PCA is facing outward so it fits into the slot in the keyboard, and make sure the buttons on the PCA are facing down and aligned with the buttons on the keyboard. 2 One side of the keyboard has two tabs. Snap the PCA into the slot below the two tabs.
Note: On 32-inch models, to replace the IR board, plug the cable into the connector on the IR board before you replace the screws. Removing the Wall Mount Brackets Remove the four screws and lift the wall mount brackets away from the board cover.
Removing the Board Cover Remove the seven screws from the board cover and remove the board cover. Note: When replacing the board cover, do NOT replace the screws above the s-video connectors and the red and white RCA jacks (audio output) as indicated by the arrows in the first of the two pictures above. You will replace these screws when you replace the back cover.
1 Detach all the cables connected to the main board. You must remove one screw to remove the LVDS cable.
Speaker IR cable (above) LVDS cable, requires screw removal (above) HP High-Definition LCD TV Service Manual 53
2 Remove the six screws from the I/O bracket. 3 Remove the five screws securing the main board to the main bracket.
4 Remove the main board together with the I/O bracket. 5 To remove the brackets from the main board: a. Remove the collar nut from the antenna/cable in connector. b. On the black-faced bracket that has the row of TV connectors, remove the three black machine screws located over the HDMI ports. c. Remove the five remaining black, self-tapping screws, and then remove the bracket from the main board. d.
Use the following image to note of the wiring when replacing the cables to their respective connectors. The image is representative of all four models except for the 32-inch model, which has only one inverter.
Inverter cables (above) The Master inverter cable connector is closer to the outside of the board.
2 Remove the four screws securing the power supply to the main bracket. 3 Remove the power supply.
Removing the Main Bracket You can remove the main bracket with the power supply and main board in place. This is useful when replacing speakers, the control board, the IR board, or the inverters. 1 Remove the ten screws from the main bracket. 2 Remove the main bracket from the LCD panel Note: When replacing the main bracket on the 32-inch model, place the bottom of the bracket about 1/2-inch above the bottom of the speakers.
Removing the Inverters When replacing inverters, first replace the board(s), and then test the unit. If the TV still does not work, replace the inverter cable(s). Inverters are spared as a pair (except for the 32-inch model), so you should replace both. The inverters are NOT the same – there is a Master and a Slave. If you are facing the back of the unit, the Master inverter is on the left side above the speaker marked L (for left).
LT 3700 Inverter Removal Note: The 37-inch model has different sized inverters, as well as an additional flat ribbon cable from the inverter to the control board. 1 Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and out of the unit. 2 Disconnect the cables from the connectors on the inverter board. Note: 4 total cables on Master. 3 total cables on Slave.
LT 4200 Inverter Removal 1 Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and off the unit. 2 Disconnect the 10 cables from the connectors on the rear of the inverter board, and the remaining cables from the connectors on each side of the board. Note: Grasp both sides of the cable connector and pull it straight from the connector on the board. 3 Lift the inverter board up and off the unit.
LT 4700 Inverter Removal 1 Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and off the unit. 2 Disconnect the 15 cables from the connectors on the rear of the inverter board, and the remaining three cables from the connectors on each side of the board. Cable notes: 15 total cables on each board – 12 on back of board, 1 on each side. Pull the blue tabs straight out to disconnect the cables. 3 Lift the inverter board up and off the unit.
1 Release the speaker cables from the latches. 2 Remove the two screws from each speaker. Note: For the 47-inch model, remove the wires from the clip holders.
3 Remove the speakers from the LCD module. Removing the Control Board You have to remove the main bracket, but do not have to remove the main board or power supply to remove the control board. LT3200 Control Board Removal 1 Disconnect the front LVDS cable by pressing the spring-loaded latches on each side of the cable connector, and then pulling the cable from the connector. 2 Remove the five screws that secure the control board cover to the unit. 3 Lift the cover from the unit.
4 Lift the board from the unit. Note: When replacing the cover, insert the edge of the cover into the slots on the main bracket. LT 3700 Control Board Removal 1 Disconnect the front LVDS cable by pulling the cable from the connector. Note: The latches are not spring-loaded on the 37-inch model. 2 Pull the small white ribbon cable straight out to remove it from the connector. 3 Remove the three screws that secure the control board cover to the unit. 4 Lift the cover from the unit.
LT4200 Control Board Removal 1 Disconnect the front LVDS cable by pressing in on the spring-loaded latches on each side of the cable connector, and then pulling the cable from the connector. 2 Remove the four screws that secure the control board cover to the unit. Two of the screws are hidden under the pads. 42-inch model shown 3 Lift the cover from the unit.
5 Remove the flat ribbon cables from the connectors on the main TV chassis. 6 Lift the board from the unit. Note: When replacing the control board cover, place the lip on the back of the cover into the slot on the main bracket, and then rotate the cover down into place. LT4700 Control Board Removal 1 Disconnect the front LVDS cable by pressing in on the spring-loaded latches on each side of the cable connector, and then pulling the cable from the connector.
Removing the Front Bezel To remove the front bezel, remove the back cover, then put the unit back on the stand, as follows: 1 2 3 4 5 Remove the stand. Remove the back cover. Remove the IR/keypad assembly. Remove the speakers. Replace the stand and set the TV upright on the stand. 37-inch model with back cover removed 6 Unlatch the plastic tabs that secure the bezel to the unit. 7 Remove the bezel from the unit.
Diagnostics This section identifies potential service modes used for service along with their function and purpose. This section also identifies error detection LEDs and error codes.
How to get back to normal TV operation after running diagnostics 1 After the diagnostic test finishes, power off the TV and disconnect the power cord. 2 Wait for about 30 seconds; and then plug the power cord back in. The TV returns to normal mode. Installation menu The TVs incorporate custom menus that are accessible only through a special combination of the keys on the remote control.
Black Level format Black Level Light (0 IRE) Dark (7.5 IRE) Active only for Component 480i input. This menu is enabled Component input only, The selection is only effective for 480i format. Audio re-map The audio remap option allows a custom installer to use the Composite/S-Video audio ports as extra input audio ports for DVI sources.
Hotel mode Hotel mode allows hotels to not allow their guests to change TV configurations. This mode blocks some remote buttons and TV functionality, including the MENU and FAV buttons How to enable and disable TVs are delivered to hotels in normal mode. To access the installation menu: 1 Run the Setup wizard (or channel scan and time setup) through the main menu. 2 Access the install menu and change to HOTEL mode from Normal TV mode. To access the installation menu: 1 Turn the TV on.
Troubleshooting Remote Control Remote control does not work YES Change battery Replace battery NO Try another remote YES Replace remote control Check IR receiver Change LED & IR board YES OK NO Change LED & IR cable YES Replace LED & IR cable NO Replace main board 74 HP High-Definition LCD TV Service Manual
Function Key The buttons do not work YES Check switches Replace tact switch NO YES Check key board Replace key board NO Check the key board cable Change the key board cable YES OK NO Replace the main board HP High-Definition LCD TV Service Manual 75
Power: TV Does Not Turn On 76 HP High-Definition LCD TV Service Manual
Audio No sound YES Check the connecter Reconnect NO YES Check the speaker wire Replace the speaker wire NO YES Check the speaker set Replace the speaker set NO Replace the main board HP High-Definition LCD TV Service Manual 77
VGA Input No picture on the screen NO Check if PC is working Check PC YES YES Check VGA connect OK NO Check VGA cable YES Replace VGA cable NO Replace the main board 78 HP High-Definition LCD TV Service Manual
HDMI Input No picture on the screen Check if HDMI source works NO Check HDMI source NO Check HDMI connection YES Reconnect NO Check HDMI cable YES Replace HDMI cable NO Replace the main board HP High-Definition LCD TV Service Manual 79
DVI Input No picture on the screen Check if PC is working NO Check PC YES Check DVI connection YES Reconnect NO Check DVI-toHDMI adapter YES Replace adapter NO Check the HDMI cable YES Replace the HDMI cable NO Check the DVI cable YES Replace the DVI cable NO Replace the main board 80 HP High-Definition LCD TV Service Manual
YPbPr Input No picture on the screen Check the Source; is it working? NO Check the Source device YES Check connect YES Reconnect NO Check wires (green, blue, red) YES Replace wires NO Replace the main board HP High-Definition LCD TV Service Manual 81
TV/Video/S-video Input No picture on the screen Check if the Source is working NO Check signal source YES Check connect YES Reconnect NO Check cable YES Replace cable NO Check tuner & audio board YES Replace tuner & audio board NO Replace the main board 82 HP High-Definition LCD TV Service Manual
Troubleshooting Tips No Power • Check the power supply unit (PSU) – Is the PSU board defective? • Is the power cord connector grounded? • Check the cable between the PSU board and the main board. • Is the keypad/remote control power button working? • Is the power connector connected? No Video • Is there an input source connected? • Is the LED on? o Check the main board and panel cable connection.
LED Display abnormal The front panel LED uses the following blinking patterns to indicate failures: Indicator Blink Frequency Failure Part Location Amber and aqua LED blinking 1 sec interval MCU-Host link error Main board Amber LED blinking 1 sec interval TAFE does not respond Main board Aqua LED blinking 1 sec interval Tuner does not respond Main board Amber LED blinking 2 sec interval Digital Demodulator does not respond Main board Aqua LED blinking 2 sec interval Audio process does
Example of defective LCDs The pictures below are some of the example of what a defective LCD looks like and how to solve the problem: Problem: LCD crack Solution: Change LCD panel Problem: Scrape on the LCD panel (1) Solution: Change LCD panel HP High-Definition LCD TV Service Manual 85
Problem: Scrape on the LCD panel (2) Solution: Change LCD panel or change Polarizer Problem: Mura (cloudiness) Solution: Change LCD panel 86 HP High-Definition LCD TV Service Manual
Problem: Line Solution: Change LCD panel HP High-Definition LCD TV Service Manual 87
Chassis Layout and Overall Wiring Diagrams Boards Layout (Typical of all models except 32-inch*) * The 32-inch model has only one inverter. No.
Connectors Main Board Connector Specification Description CN19 13 pins/ROHS Power supply from power converter board CN114 CN15 28 pins/ROHS LVDS output signal (Between main board and panel) CN18 4 pins/ROHS Audio power CN12 11 pins/ROHS Keypad and IR control (connect to keypad board and IR board) HP High-Definition LCD TV Service Manual 89
Keypad and IR Boards Keypad Board IR Board Connector Specification Description CN1 9 pins/ROHS Keypad control signal from main board CN12 CN1 6 pins/ROHS IR signal and LED control from main board CN12 90 HP High-Definition LCD TV Service Manual
Wires and Cables Wiring Main Board No.
Wiring Diagram 92 HP High-Definition LCD TV Service Manual
Firmware Update Procedure Overview Firmware updates are available for download from the HP Web site. The updates consist of two files, as follows: • For the LT3200 and LT3700 — The update_LCD720.tgz and safe-kernel.img1 files • For the LT4200 and LT4700 — The update_LCD1080.tgz and safe-kernel.img1 files To transfer the firmware onto the TV, copy the update to a FAT32-formatted USB flash drive. Note: The USB flash drive must be formatted in FAT32 or the update will not work.
Software Feature Requirement 1 safe-kernel.img1 reads images with different names, as follows: a. update _LCD720.tgz b. update_LCD1080.tgz 2 safe_kerenl.img1 uncompresses update_xxx.tgz, and then reads product IDs from it. Product IDs are as follows: a. LCD720: all 720P LCD TVs b. LCD 1080: all 1080P LCD TVs 3 Assume all TV boards are loaded and initially tested by the ODM and product IDs are embedded into a flash memory block. Software Update Procedure 1 Load Safe Kernel from a USB drive key.
Appendix A – LCD Panel Specifications See the following Web sites for specification information for the TVs: Chi Mei Optoelectronics Corporation: • Model: V470H1-L02: http://www.cmo.com.tw/cmo/english/product/showtv.jsp?flag=20040804204008 • Model: V420H1-L05: http://www.cmo.com.tw/cmo/english/product/showtv.jsp?flag=20050408182850 AU Optronics Corporation LCD Panel Product Specifications • Model: T315XW02 http://www.auo.com/auoDEV/products.
Part Number 454404-001
