TopPage LC-90LE740X SERVICE MANUAL No. SY2A4LC90LE74 LCD COLOR TELEVISION MODEL LC-90LE740X In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used. CONTENTS SAFETY PRECAUTION IMPORTANT SERVICE SAFETY PRECAUTION ............................................................i PRECAUTIONS FOR USING LEAD-FREE SOLDER .....................................................
LC-90LE740X LC-90LE740X SAFETY PRECAUTION Service Manual IMPORTANT SERVICE SAFETY PRECAUTION Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: WARNING • Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.
LC-90LE740X PRECAUTIONS FOR USING LEAD-FREE SOLDER Employing lead-free solder • “PWBs” of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder. Example: Indicates lead-free solder of tin, silver and copper. Indicates lead-free solder of tin, silver and copper.
LC-90LE740X LC-90LE740X OUTLINE Service Manual MAJOR SERVICE PARTS PWB Unit No. N N N N N N N PARTS CODE DKEYMF953FMJ6 DUNTKF800FMF8 DUNTKF975FM18 DUNTKG014FMF7 DUNTKG015FMF7 DUNTKG017FMF7 RUNTKB096WJQZ DESCRIPTION MAIN Unit KEY Unit LCD CONTROL Unit EMBLEM Unit R/C LED Unit 3D IR Unit POWER/DRIVE UNIT NOTE: *1 Replace MAIN PWB Units (DKEYMF953FMJ6) in case of IC3104 failure. OTHER Unit No.
LC-90LE740X CHAPTER 1.
LC-90LE740X CHAPTER 2.
LC-90LE740X 2–2
LC-90LE740X 2–3
LC-90LE740X 2–4
LC-90LE740X CHAPTER 3.
LC-90LE740X Service CHAPTER 4. REMOVING OF MAJOR PARTS LC-90LE740X Manual [1] REMOVING OF MAJOR PARTS 1. Removing of Stand Unit and Rear Cabinet Ass’y. 1. Remove the 4 lock screws (1) and detach the Stand Unit (2). 2. Remove the 3 lock screws (3), 20 lock screws (4), 10 lock screws (5) and detach the Rear Cabinet (L) Ass’y (6), Rear Cabinet (R) Ass’y (7). 3. Remove the 5 lock screws (8), 8 lock screws (9), 2 lock screws (10), 2 angles (11) and detach the Rear Cabinet (C) Ass’y (12).
LC-90LE740X 2. Removing of Speaker (L/R), Speaker (Woofer) and KEY Unit. 1. Disconnect the SP wire. 2. Remove the 2 lock screws (1) and detach the Speaker (L) (2), Speaker (R) (3). 3. Disconnect the RC wire. 4. Detach the KEY Unit Ass’y (4). 5. Disconnect the KM wire. 6. Remove the 2 lock screws (5) and detach the Key Button (6) from Key Cover (8). 7. Detach the KEY Unit (7) from Key Button (6). 8. Disconnect the SB wire. 9. Detach the Speaker (Woofer) (9).
LC-90LE740X 3. Removing of Connectors, 90” LCD Panel Module Unit Ass’y. 1. Disconnect the following connectors from the MAIN Unit. (LV, PD) 2. Disconnect the following connectors from the POWER/DRIVE Unit. (L1, L2, PD) 3. Disconnect the following connectors from the LCD Control Unit. (PL, LV) 4. Remove the 16 lock screws (1) and detach the 16 Module Fix Angles (2) 5. Remove the 7 Hooks and detach the 90” LCD Panel Module Unit Ass’y (3). 6. Detach the 2 Bottom cover (4).
LC-90LE740X 4. Removing of LCD CONTROL Unit, MAIN Unit, POWER/DRIVE Unit. 1. Remove the 5 lock screws (1) and detach the Shield (MAIN) (2). 2. Remove the 3 lock screws (3) and detach the MAIN Unit (4) and Terminal Angle (Bottom) (5). 3. Remove the 6 lock screws (6) and detach the POWER/DRIVE Unit (7). 4. Remove the 4 lock screws (8) and detach the 2 Speaker Holders (9).
LC-90LE740X 5. Removing of R/C LED Unit, EMBLEM Unit, 3D IR Unit. 1. Detach the R/C LED Unit (1). 2. Disconnect the RA wire. 3. Detach the EMBLEM Unit (2). 4. Disconnect the CI wire. 5. Detach 3D IR Unit (3). 6. Disconnect the IR wire.
LC-90LE740X [2] The location putting on the heat measure sheet 1. MAIN PWB Unit PSPAZC871WJKZ 2.
LC-90LE740X [3] Precautions for assembly 1. Points to be checked and precautions when servicing the unit Mount the main PWB Ass’y on the backlight chassis and check that the EMI-prevention parts are not peeled and twisted from the access holes. (The EMI-prevention parts, conductive nonwoven fabric gaskets, must be seen from the access holes.) [Countermeasure] Attach the conductive nonwoven fabric gaskets on the shielded case on the main PWB.
LC-90LE740X The following is a drawing mounting the main PWB Ass’y on the backlight chassis. (The parts indicated by -> are the access holes for confirmation.
LC-90LE740X CHAPTER 5. ADJUSTMENT LC-90LE740X Service Manual [1] ADJUSTMENT PROCEDURE Main unit supplied as service unit was adjusted on some item. However, W/B adj is not finished because it needs to be done by final set condition. So the main unit is in the adjustment condition when it is supplied and K mark is shown up in display when you use it. After finishing Factory setting, K -mark disappear so please do it as following ADJUSTMENT PROCUDURE.
LC-90LE740X 2.2.3 How to upgrade the software 1. Unplug the AC cord. 2. Insert the USB Memory for version upgrade into USB1. 3. Plug in the AC cord with power button pressed down. 4. After 5 seconds, unpress the power button. 5. After the unit startup, the system upgrade screen as shown below within 20-40 seconds. Software Update 90LE740X MAIN 50% SUB MICOM NO DATA PANEL EEPROM NO DATA 3D IR MICOM 101X1207302 MAIN Version SUB MICOM Version 㧙㧙㧙㧙㧙 PANEL EEPROM 㧙㧙㧙㧙 3D IR MICOM Version 6.
LC-90LE740X 2.3. Monitor microprocessor software version upgrade Create the USB memory for monitor microprocessor software version upgrade in the same manner as explained in the “Main software version upgrade”. Copy the file LEON_LE740X_xxx.USB and LEONSUBxxx.SMB. (named temporarily) for monitor microprocessor software version upgrade to the USB memory. 2.3.1 How to upgrade the software 1. Unplug the AC cord. 2. Insert the USB Memory for version upgrade into USB1. 3.
LC-90LE740X 3. Entering and exiting the adjustment process mode 1) Before entering the adjustment process mode, the AV position RESET in the video adjustment menu. 2) While holding down the “VOL(-)” and “INPUT” keys at a time, plug in the AC cord of the main unit to turn on the power. The letter “” appears on the screen. 3) Next, hold down the “VOL(-)” and “CH( (The “VOL (—)” and “CH ( )” keys at a time. )” keys should be pressed and held until the display appears.
LC-90LE740X 5. List of adjustment process mode menu The character string in brackets [ ] will appear as a page title in the adjustment process menu header. Page 1/20 Line Item Description 1xxx(xxxxx) xxxxxxx xxxxxxx xxxxxxxx/xxxx xxx/xxxx xxxxx/NO Remarks (adjustment detail, etc.
LC-90LE740X Page 5/20 Line Item Description Remarks (adjustment detail, etc.) 1 2 3 4 5 HDMI CEC TEST HDMI EDID WRITE INSPECT USB TERM MONIDATA READ [TEMP/OPC] CAUSE RESET Enter HDMI CEC test Enter HDMI EDID WRITING PORT ALL : - - - - - - Reading inspection of USB memory terminal OFF MONITOR Temperature/OPC Acquisition tool.
LC-90LE740X Page 14/20 Line Item 1 2 3 4 T-CON VERSION EXT.1 T-CON VERSION EXT.2 T-CON VERSION EXT.3 T-CON VERSION EXT.4 1 2 3 4 3D HDMI FPGA Version 2D→3D FPGA Version 3D LED BRIGHTNESS 3D IR EMITTER CONTROL 1 2 3 4 5 6 7 8 CROSS TALK ADJ MODE CROSS TALK TH1 CROSS TALK TH2 CROSS TALK TH3 CROSS TALK TH4 CROSS TALK GAIN1 CROSS TALK GAIN2 CROSS TALK GAIN3 1 2 3 4 5 6 7 WIFI SSID 2.4GHz WIFI SSID 5GHz WIFI RSSI 2.4GHz WIFI RSSI 5GHz WIFI TIME 2.
LC-90LE740X 6. Special features * STANDBY CAUSE (Page 1/20) Display of a cause (code) of the last standby The cause of the last standby is recorded in EEPROM whenever possible. Checking this code will be useful in finding a problem when you repair the troubled set. * EEP SAVE (Page 20/20) Storage of EEP adjustment value * EEP RECOVER (Page 20/20) Retrieval of EEP adjustment value from storage area 7.
LC-90LE740X Display 11 16 1A 1D 1E 1F 21 23 Communication Error H LCD Module Error Other Error 2 Power supply Error1 Power supply Error 2 Power supply Error 3 Power supply Error 5 Other Error 3 Error Reason Regular communication Time-out Lamp Error Monitor Temperature Error PS_ON(AC_DET) Error D_POW(DET_13V) Error D_POW(DET_D3V3) Error Panel Power Error Error Standby request from Main CPU 8.
LC-90LE740X 10. Video signal adjustment procedure The adjustment process mode menu is listed in Section 5. Signal generator level adjustment check (Adjustment to the specified level) • • • Composite signal PAL/SECAM RGB signal 15K component signal (50 Hz) • 33K component signal (50 Hz) • Composite signal NTSC : 0.7Vp-p ± 0.02Vp-p (Pedestal to white level) : 0.7Vp-p ± 0.02Vp-p : Y level : 0.7Vp-p ± 0.02Vp-p (Pedestal to white level) : PB, PR level : 0.7Vp-p ± 0.02Vp-p : Y level : 0.7Vp-p ± 0.
LC-90LE740X 10.4. NTSC signal adjustment 1 Adjustment point Setting Adjustment conditions [Signal] N358 Full field colour Bar Signal • Adjustment procedure Feed the NTSC full field colour bar signal (75% colour saturation) to INPUT6 video input. [VIDEO input signal] [Terminal] INPUT6 video input 100% white 2 Auto adjustment performance Adjustment process [N358 ADJ] page 4/20 Black Bring the cursor on [N358 ADJ] and press [ENTER]. [N358 ADJ OK] appears when finished. 10.5.
LC-90LE740X 10.7. ADC adjustment (Component 33K) 1 Adjustment point Setting Adjustment conditions [Signal] COMP33K, 50Hz (1080i/50Hz) 100% Full field colour bar Signal • Adjustment procedure Feed the COMPONENT 33K 100% full field colour bar signal (100% colour saturation) to INPUT5 COMPONENT IN. [Terminal] INPUT5 COMPONENT IN 100% white 2 Auto adjustment performance Adjustment process [HDTV ADJ] page 7/20 Black Bring the cursor on [HDTV ADJ] and press [ENTER]. [HDTV ADJ OK] appears when finished.
LC-90LE740X 12. Key writing 12.1. EDID writing (Main PWB: QPWBXF953WJ**) 1 Adjustment point HDMI EDID writing ANALOG RGB EDID writing (Main PWB) Adjustment conditions Process mode Model discrimination check Adjustment procedure 1) Enter the process mode. 2) Point the cursor to [HDMI EDID WRITE] and press the [ENT] key. The writing is complete when [OK] is displayed. (If not written, HDMI does not function.) CAUTION: Perform the data writing after setting the model discrimination.
LC-90LE740X [2] PUBLIC MODE SETTING PROCEDURE 1. How to start Public Mode Starting the Public Mode • There is one following ways to display the PUBLIC Mode setting screen. 1) Method of needing password a) Press the "INPUT" and "VOL (+)" keys on the set at once and turn on the power. b) Display the Pass Word input screen. Enter password Enter password Enter password Operation procedure • The initial input position is the digit at the left end.
LC-90LE740X 4. Public Mode Menu The guidance is not displayed on screen. Setup procedure • To move the cursor up and down, use the “cursor UP/DOWN” key (remote controller) and “CH ( )/( )” key (remote controller and set). • To change the settings, use the “cursor RIGHT/LEFT” key (remote controller) and “VOL (+)/(–)” key (remote controller and set). • To save new settings, keep the cursor at “EXECUTE” and use “ENTER” key (remote controller and set). 27$.+% /1&' 219'4 10 (+:'& =8#4+#$.
LC-90LE740X 5. On Setting Items 1) Power ON fixed [POWER ON FIXED] Option Default Function Key disabled when set other than default Remarks “VARIABLE”, “FIXED_ALL”, “FIXED_BODYKEY” or “RCRESPOND” (loop enabled) “VARIABLE” : “POWER/RECEPTION” key on TV unit or remote control is enabled. • VARIABLE : “POWER/RECEPTION” key on TV unit or remote control is disabled. • FIXED_ALL • FIXED_BODYKEY : Only the “MAIN POWER” key on TV unit is disabled (The remote control is enabled).
LC-90LE740X 4) Volume fixed [VOLUME FIXED] Option Default Function Exception Disabled key when setting to FIXED Remarks “VARIABLE”, “FIXED”, “ACCTRL” or “AC/RCCTRL” (loop enabled) “VARIABLE” • VARIABLE : The volume is not fixed. • FIXED : The volume is fixed to the value adjusted in the volume fixed level. • AC CTRL : The unit starts at the volume specified in the volume fixed level, when power is turned on in the case of the AC-ON only.
LC-90LE740X 8) Menu operation [MENU BUTTON] Option Default Function Exception Disabled key excluding Menu key when setting to not default Remarks “RESPOND” or “NO RESPOND” (loop enabled) “RESPOND” The MENU key on the main unit and remote control is decided whether it is enabled or disabled. • RESPOND : The manu key is enabled. • NO RESPOND : The manu key is disabled. : All the keys are enabled regardless of this setting while entering the process mode, inspection mode or Public Mode setting screen.
LC-90LE740X 11) Start mode [INPUT MODE START] Option Default Function Remarks “NORMAL” or “Input source 1 (input selection or channel)” ... (loop enabled) “NORMAL” Which kinds of input source or channel is decided when the power turning on. NORMAL : The content of the last memory is followed. • When setting to not Normal, ON TIMER (Watching reservation) has priority. • When setting to “NORMAL”, [INPUT MODE FIXED] is set to “VARIABLE” and [INPUT MODE FIXED] is prohibited to select. (selection impossible.
LC-90LE740X 15) 232C power ON control [232C POWON] Option Default Function “ENABLE” or “DISABLE” (loop enabled) DISABLE The item decide whether Power ON by the 232C command is enabled/disabled in the standby state. The same function as 232C command “RSPW”. ENABLE : POWR0001 is always enabled. DISABLE : Start-up may be impossible at POWR0001. (If the 232C command reception module is set to OFF, the command is invalid.
LC-90LE740X [3] USB Clone Specifications Input “369” as password on the copy mode screen using the same input method as Public Mode on the previous page. 1. Screen Specifications (copy mode ) • TV→USB (sucking from TV) * Do not focus on button before recognition of USB device and use is possible. Copy mode TV USB USB [ Start ] TV [ Start ] USB USB USB [ Wait… ] [ Start TV ] Processing failed or multiple insertion.
LC-90LE740X 3. USB Clone Restrictions • Be sure to set the network setting (Setup/View setting/Network setup) after writing the data by USB Clone (USB→TV). • Use USB memory with a memory capacity of 1M byte or greater. • The USB memory file system is FAT (FAT32). • No connection of multiple USB memories to the USB port. • If the USB memory connection is one connection, carry out clone operations regardless of what USB port it is connected to.
LC-90LE740X Service CHAPTER 6. TROUBLESHOOTING TABLE LC-90LE740X Manual [1] Failure diagnosis by LED in front of cabinet START Is the Center Icon flashing? Yes Check "[2] LED flashing specification at the time of an error (Center icon LED used)". No Is the Center Icon lighting When AC plug on? No Check Power-Unit and AC-cable. Yes Is the Backlight lighting? No Check "LED Backlight does not turn on.". Yes Check "Picture does not display.".
LC-90LE740X Table 1. Concrete flashing pattern Item Inverter/Lamp system failure Power PWB failure (Power failure, etc.) Detail display Slow flashing Flashes once Flashes twice Main PWB failure (Communication failure, etc.) Flashes 3 times Others Flashes 4 times Fast flashing Flashes once Flash once Flash twice Flash 3 times Flash 5 times Flashes once Flashes twice Flashes 3 times Flashes 5 times Flashes once Flashes 3 times *2: They depend on the system.
LC-90LE740X 3. New method LED flashing timing chart at the time of an error 100ms 400ms 1.6sec 1) Inverter/Lamp failure details (Flashes slowly once and flashes fast) Error type Lamp failure Flashes fast once Center icon LED operation H: On L: Off 2) Power failure details (Flashes slowly twice and flashes fast) SM_POW Main 13V failure Flashes fast twice D_POW Digital 3.
LC-90LE740X 4) Other failure details (Flashes slowly 4 times and flashes fast) Error type Monitor temperature failure Flashes fast once Note Center icon LED operation H: On L: Off Main failure Flashes fast 3 times H: On L: Off 6–4 Pins are monitor microprocessor pins unless otherwise specified. If the panel temperature is 60°C or more for 15 seconds or more in a row, CAUTION appears on the OSD (flashes in red in the lower right screen).
LC-90LE740X [3] TROUBLESHOOTING TABLE • LED Backlight does not turn on. If it is not an error of power supply/LED driver, It is start-up in the lamp error disregard mode. Do you start? YES When main unit is replaced, does it start normally? YES Replace main unit. NO When LCD control unit is replaced, does it start normally? YES Replace LCD control unit. NO When the parts in the panel can be replaced. →Replace all LED-bars in the panel module. When the parts in the panel cannot be replaced.
LC-90LE740X Trouble Shooting Panel Module When C-S FPC is replaced, does screen display normally? YES Replace C-S FPC. NO When C-PWB is replaced, does screen display normally? YES Replace C-PWB. (Adjust “VCOM ADJ” after replace C-PWB) NO Replace Panel HIRAKI.
LC-90LE740X • Picture does not display. Trouble Shooting LCD controller board(C-PWB) A screen isn't displayed. (The LED Backlight has shone at start-up) YES NO Please enter the adjustment process mode and display "LCD TEST PATTERN 2" of 13 page. Please press volume (-)/(+) keys and a test pattern is displayed. Is it all usually displayed? • • It is checked whether PL/LW is connected correctly. Replace another C-PWB. YES It isn't the fault of a C-PWB.
LC-90LE740X No video (1)-1 HDMI: No external input video [INPUT-1] Is INPUT-1 selected on the input select menu screen? NO Select INPUT-1 on the input select menu screen for the right input signal. YES Does the HOT PLUG detection function? Does the DDC5V signal come from pin (18) of SC1501 to pin (60) of IC2601 (HDMI_SW)? NO Check the line between the pin(18) of SC1501 and the pin(60) of IC2601. NO Check the line between the pin (19) of SC1501 and the pin (59) of IC2601.
LC-90LE740X No video (1)-2 HDMI: No external input video [INPUT-2] Is INPUT-2 selected on the input select menu screen? NO Select INPUT-2 on the input select menu screen for the right input signal. YES Does the HOT PLUG detection function? Does the DDC5V signal come from pin (18) of SC1502 to pin (75) of IC2601 (HDMI_SW)? NO Check the line between the pin(18) of SC1502 and the pin(75) of IC2601.
LC-90LE740X No video (1)-3 HDMI: No external input video [INPUT-3] Is INPUT-3 selected on the input select menu screen? NO Select INPUT-3 on the input select menu screen for the right input signal. YES Does the HOT PLUG detection function? Does the DDC5V signal come from pin (18) of SC1503 to pin (56) of IC2601 (HDMI_SW)? NO Check the line between the pin(18) of SC1503 and the pin(56) of IC2601. NO Check the line between the pin (55) of IC2601 and the pin (19) of SC1503.
LC-90LE740X No video (1)-4 HDMI: No external input video [INPUT-4] Is INPUT-4 selected on the input select menu screen? NO Select INPUT-4 on the input select menu screen for the right input signal. YES Does the HOT PLUG detection function? Does the DDC5V signal come from pin (18) of SC1504 to pin (51) of IC2601 (HDMI_SW)? NO Check the line between the pin(18) of SC1504 and the pin(51) of IC2601. NO Check the line between the pin (50) of IC2601 and the pin (19) of SC1504.
LC-90LE740X No video (2) COMPONENT: No external input video [INPUT-5] Is INPUT-5 selected on the input select menu screen? Is the INPUT-SELECT for the input signal? NO Select INPUT-5 on the input select menu screen for the right input signal. Is "COMPONENT" selected on the input select menu screen? NO Select "COMPONENT" on the input menu screen for the right input signal.
LC-90LE740X No video (3) COMPSITE: No external input video [INPUT-5] COMPSITE: No external input video [INPUT-6] Is INPUT-5 selected on the input select menu screen? Is INPUT-6 selected on the input select menu screen? NO Select INPUT-5 on the input select menu screen for the right input signal. NO Select INPUT-6 on the input select menu screen for the right input signal. NO Is "VIDEO" selected on the input select menu screen? YES Select "VIDEO" on the input menu screen for the right input signal.
LC-90LE740X No video (4) PC: No external input video [INPUT7] Is the INPUT-7 selected on the input select menu screen? NO Select INPUT-7 on the input select menu screen for the right input signal. YES Is IC2601 (HDMI-SW) accessed by I2C, with PC connected, to read the VGA_SCL/SDA data? Check the DDC-12C line and its peripheral circuits. (IC2601 and its peripherals).
LC-90LE740X No video (5) No video at UHF/VHF broadcast signal reception No video at digital broadcast signal reception Is the specified TV signal selected on the input select menu screen? Are there the IF signal at input pins(AT32/AU32)(TUN_IFN/P) of IC3301(CPU)? Are there the IF signal at input pins(AT32/AU32)(TUN_IFN/P) of IC3301(CPU)? Is there IF-AGC signal at input pin(12) of TU1104? NO Check the IF signal line between IC3301 and TU1104, and their peripheral circuits. Check the Tuner I2C lines.
LC-90LE740X No video (6) MHL:No external input video [INPUT-4] (using MHL Cable with Mobile Phone) Is INPUT-4 selected on the input select menu screen? NO YES Does the MHL Cable detection function? Does the CD_SENSE signal (High level) come from pin(2) of SC1504 to pin(69) of IC2601(HDMI-SW)? NO YES Does the CBUS signal come from pin(50) of IC2601 to pin(19) of SC1504? NO YES Does the VBUS signal (5V valtage power signal) output from pin(6) of IC1507 to pin(18) of SC1504? NO YES Are there the TMDS s
LC-90LE740X • Does not sound. No audio (1) INPUT-6 No audio. INPUT-5 No audio. Is INPUT-6 selected on the input select menu screen? Is INPUT-5 selected on the input select menu screen? NO Refer to “: No external input video [INPUT-6]”. NO Refer to “: No external input video [INPUT-5]”.
LC-90LE740X No audio (2) [PC analog audio input] INPUT-7 No audio. [HDMI analog audio input] INPUT-2 No audio. Is INPUT-7 selected on the input select menu screen ? Is INPUT-2 selected on the input select menu screen? NO Refer to ": No external input video [INPUT-7]". NO Refer to “: No external input video [INPUT-2]”.
LC-90LE740X No audio (3) No audio at UHF/VHF broadcast signal reception. No audio at digital broadcast signal reception. Is TV selected on the input select menu screen? Is TV selected on the input select menu screen? NO Refer to “No video at UHF/VHF broadcast signal reception”. NO Refer to “No video at digital broadcast signal reception”.
LC-90LE740X No audio (4) INPUT-1 No audio (HDMI connected) INPUT-2 No audio (HDMI connected) INPUT-3 No audio (HDMI connected) INPUT-4 No audio (HDMI connected or MHL connected) [INPUT-1 input] Is INPUT-1 selected on the input select menu screen? [INPUT-2 input] Is INPUT-2 selected on the input select menu screen? [INPUT-3 input] Is INPUT-3 selected on the input select menu screen? [INPUT-4 input] Is INPUT-4 selected on the input select menu screen? YES NO Refer to “: No external input video [INPUT-1/2/
LC-90LE740X No audio signal at Digital Audio Output terminal (Analog sound heard) No INPUT-1/2/3/4 (HDMI) audio. No audio at digital broadcast signal reception. If no video appears, refer to “No external input video (HDMI) [INPUT-1/2/3/4]”. If no video appears, refer to “No video at digital broadcast signal reception”. Is there the SPDIF signal output (CPU_ASPDIF) at pin (AR16) of IC3301 (CPU)? NO Check the IC3301 and its peripheral circuits.
LC-90LE740X No monitor audio output Are there the audio signal outputs at pins (AN34) (HP_MONITOR_L) and (AN3532) (HP_MONITOR_R) of IC3301 (CPU)? NO Check IC3301 (CPU) and its peripheral circuits. YES Does the audio signal come from pins (2) (MONI_HP_L) and (11) (MONI_HP_R) of IC1702 (Line-out Amplifier) to pins (3) (L) and (2) (R) of J504? NO Check the line between IC1702 and J504 and their peripheral circuits. Check the LINE_MUTE line and its peripheral circuits(Q506/Q510, etc).
LC-90LE740X CHAPTER 7. MAJOR IC INFORMATIONS Service LC-90LE740X Manual [1] MAJOR IC INFORMATIONS 1. MAJOR IC INFORMATIONS 1.1. IC2601 (VHiSii9387A-1Q) This IC is 5 input and 1 output HDMI port processor. The TMDS cores run at 2.25Gbps. (Supports video resolutions up to 1080p, 60Hz, 12bit.) The adaptive equalizer provides long cable support. This IC has been pre-programmed with HDCP keys. EDID and DDC support for 5 HDMI/DVI ports and 1 VGA port.
LC-90LE740X 1.12. IC1703 (VHiYSS952QZ-1Y) Audio DSP (YSS952QZ) has digital audio adjustment function (for example, PEQ, bass/treble, balance, bass enhancer, etc.) and adjusts TVs audio quality.
LC-90LE740X CHAPTER 8.
LC-90LE740X [2] SYSTEM BLOCK DIAGRAM SYSTEM BLOCK DIAGRAM J /#+0 +0276 %8$5 .4 /KPK 2NWI +0276 %QORQPGPV /KPK 2NWI %8$5 .4 +0276 /KPK 2NWI %8$5A5+&'A+0 %8$5A5+&'A+0A. 4 %1/2 A; 2D 2T %8$5 A+0 %8$5 A+0A. 4 I 8$1A.1%-0 8$1A*62&0 + %A4'#&; 20.A'0 0A20.A'0 20.A92 1(. A(4%456 ޣ.8ޤ5% R #/2A#A59 +% 8 ''241/ MDKV 8 +% 4GUGV 7%1/A456 6WPGT EKTEWKV % 0 0A670A456 67A&'/1&A5%.
LC-90LE740X PartsGuide PARTS GUIDE No. SY2A4LC90LE74 LCD COLOR TELEVISION MODEL LC-90LE740X CONTENTS [1] PRINTED WIRING BOARD ASSEMBLIES [2] LCD PANEL MODULE UNIT [3] CABINET AND MECHANICAL PARTS [4] SUPPLIED ACCESSORIES/ PACKING PARTS (NOT REPLACEMENT ITEM) [5] SERVICE JIG (USE FOR SERVICING) Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.
LC-90LE740X NO.
LC-90LE740X [3] CABINET AND MECHANICAL PARTS 43 20 4-5 11 44 25-1 20 39 4-4 SB 12 28 17 3-3 3-4 44 19 43 2-2 20 3-3 25 25-1 25-4 12-2 12-1 30 41 35 3-2 3-1 2-3 2-1 33 SP 2-2 SB 32 LW RC 21 2 2-2 37 SP G 10 3 3-3 44 19 MAIN PD Unit 12-3 38 3-3 4-1 47 25-2 9 4-2 4-5 25-3 46 45 4-3 4-6 KEY KM Unit 48 4 4-5 8 55 44 18 41 18 J 21 36 7 13 13 C 7 13 16 90" LCD Panel Module Unit 1 1-14 15 15 14 16 PL LW 42 14 16 13 16 1-1 1-14 1-
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LC-90LE740X [4] SUPPLIED ACCESSORIES/PACKING PARTS (NOT REPLACEMENT ITEM) X7 Remote control unit X9 “AAA” size battery X5 AV cable Stand unit X6 Component cable Other accessories X4 AC cord X1 Stand Base Ass'y X2 Support Ass'y • X8 Operation manual • X10 Antenna Adaptor • X12 Skype Information sheet X3 Screw X4 X5 X6 S5 S7 X2 X7 X9 X3 X12 X8 X10 S11 S7 S7 X1 S9 S10 S3 S1 S8 S9 S8 S8 S2 S6 S16 S4 5
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LC-90LE740X COPYRIGHT © 2012 BY SHARP CORPORATION ALL RIGHTS RESERVED. No Part of this publication may be reproduced, stored in a retrieval system, or transmitted in any from or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher. Dec. 2012 YK.
