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Mitsubishi Electric LT-37131, Service Manual

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Mitsubishi Electric LT-37131 Service Manual Download Page 24

Page 24

MODELS:  LT-37131 / LT-37132 / LT-46131 / LT-46231

LCD Panel Assembly Removal

1.

Remove the 2 Stand Brackets (3 screws each).

2.

Remove the PWB-AT-SW Assembly (2 screws).

3.

Remove the Upper Panel Mounting Bracket (7 screws).

4.

Remove the Lower Panel Mounting Bracket (8 screws).

STAND MOUNTING
BRACKET (3 SCREWS)

STAND MOUNTING
BRACKET (3 SCREWS)

PWB-AT_SW
ASSEMBLY
(2 SCREWS)

LOWER PANEL MOUNTING

BRACKET (8 SCREWS)

UPPER PANEL MOUNTING

BRACKET (

7

 SCREWS)

Summary of Contents for LT-37131

Page 1: ... 3 Standard Audio 480i 480p 720p 1080i VLP33 2 Rear VLP33 3 Rear PC DVI I Input Analog or Digital VGA W VGA SVGA W w Analog SVGA XGA 1280x720 720p at 60 Hz Stereo Audio Digital Only SXGA WXGA at 60Hz 1920x1080 1080p at 24 30 60Hz Inputs Outputs HDMI EIA 861 B Standard Digital 480p 720p 1080i at 60Hz 1080p at 24 30 60Hz w DVI Analog Stereo Audio 2 Rear IEEE1394 MPEG 2 2 Rear Digital Audio Output Do...

Page 2: ......

Page 3: ...Y PRECAUTIONS 5 RESET INITIALIZATION 7 OPTION MENU 11 FRONT LED INDICATOR DIAGNOSTICS 12 CableCARD 13 TV GUIDE ON SCREEN 15 USING LEAD FREE SOLDER 18 DISASSEMBLY 19 REPLACEMENT PARTS 26 Quick Reference 27 Service Parts List 28 CIRCUIT BLOCK DIAGRAMS 37 INTERCONNECT SCHEMATIC BLOCK DIAGRAM ...

Page 4: ...MODELS LT 37131 LT 37132 LT 46131 LT 46231 Page 4 ...

Page 5: ...d be kept away while the panel is being handled Keep the panel away from the body while handling 3 When service is required observe the original lead dress Where a short circuit has occurred replace those components that indicate evidence of overheating 4 If the LCD Panel is damaged crystaline liquid may leak from the LCD panel and broken glass may be scattered The crystaline liquid is toxic Avoid...

Page 6: ...th to the chassis should be a minimum of 1Meg Ohm Any resistance below this value indicates an abnormal condition and requires corrective action 2 Hot Check Use the circuit shown below to perform the hot check test 1 Keep switch S1 open and connect the receiver to the measuring circuit Immediately after connection and with the switching devices of the receiver in their operating positions measure ...

Page 7: ...t of pencil or end tip of a paperclip The changes you made most recently before using the SYSTEM RESET may be lost Changes you made previously how ever are not lost TV Reset To reset all customer settings Press M ENU 1 2 3 ENTER All customer settings except V Chip are reset Initialize User Level To reset all consumer adjusted settings and memories to the original factory defaults Press FORMAT and ...

Page 8: ...n 3 Perform while the set is Off Initial Factory Default Customer Settings Setup Menu Input Name Menu For VLP33 Language Idioma English NetCommand Menu VLP33 Memorize Channels Edit For VLP33 Review Ant1 Air Input Name Ant1 Cable Input 1 Ant2 Air Input 2 Ant2 Cable Inout 3 Clock Comp 1 Clock Setting Manual Comp 2 Time 12 00PM Comp 3 For VLP33 Date 1 1 2006 HDMI 1 Time Zone Eastern HDMI 2 Daylight S...

Page 9: ...rpness 50 Analog Captions On if Mute Brilliant Color Temp High Background Gray Perfect Color Press Enter Digital Captions On if Mute Perfect Tint VLP33 Manual center Appearance Default Deep Field Imager VLP33 On Digital Settings Gray out SharpEdge VLP33 On Font Font 3 Video Noise Off Low Medium High Medium Size Large BackLight 100 Color White Video Mute On Background Black Film Mode Auto Opacity T...

Page 10: ...er VLP33 On On On On On n a On Back Light MAX MAX MAX MAX MAX MAX MAX Video Noise Standard Standard Standard N A Standard n a N A Film Mode Auto Auto Auto N A Auto n a N A SharpEdge VLP33 Bass Center Center Center Center Center Center Center Treble Center Center Center Center Center Center Center Balance Center Center Center Center Center Center Center Surround Off Off Off Off Off Off Off Listen T...

Page 11: ...ignal Strength 3 Press Enter Example using CableCARD on ANT1 Signal Noise Ratio Tuner 0 Tuner 1 OOB Tuner Frequency MHz 597 0 75 2 Signal Level 8 0 0 Modulation 256 QAM Unknown Carrier Lock Locked Unknown Locked SQI 100 0 SNR 34 3 0 23 77 Correctable errors 0 0 UnCorrectable errors 0 0 MENU 2 4 7 0 OPTION MENU Initial Power Restore OFF Production Mode OFF Software xxx Digital Signal Strength xx xx...

Page 12: ...Fast Blinking Wait until blinking stops before turning on approximately 1 minute Normal operation If blinking does not stop unplug set and re apply power Or press System Reset LED Diagnostics Error Code Check Note The TV must be in Shut Down and not manually switched Off to perform the Error Code Opera tional Check When the TV is switched Off the code automatically resets to 12 No Error Press the ...

Page 13: ...NPUT FORMATkeys onthe front panel 3 ReplaceCableCARDwith newcard 4 Try 3rd CableCARD 5 ReplaceDM PWB 5 Individual channel cannot bereceived example HBOHDis no video and no audio but other HBO channels areOK The TV has nomeans toblock individual channels Proper authorizationis not received Contact service provider 6 Certain tier of channels is not received example Premium channels or all HD channel...

Page 14: ...6 Certain tier of channels is not received example Premium channels or all HD channels not received Authorizations to display scrambled channels are sent via OOB data Contact service provider 7 Unable to tune to a channel example Pressing 1055 has no response and stays on current channel 1055 is not available in the channel map Channel map is sent via OOB from the service provider Verify OOB is lo...

Page 15: ...old for the comparator based on the level of the incoming SUB Y signal Pin 2 of the PIC Micro provides a hold function to stabilize the H Sync during the vertical blank time The SUB Y signal is sent to IC7R02 where the slicing is preformed The output of IC7R02 is serial data and is sent to Pin 1 of PIC Micro See figure2 This data is assembled by the PIC Micro and is then transfered by serial commu...

Page 16: ... of good C packets received CErrs Amount of C packets with errors that could not be corrected CBad Amount of C packets rejected by unit TotFrTape Alargenumberindicatesthatincorrectdataiscomingthrough TVGuide VBI Slicing Test Only to be used with VBI test signal that has known good TVGuide data or at a time when TVGuide data is known to be present see figure1 on previous page 1 Connect known good s...

Page 17: ...C TypeC is below 10 000 All data on page is all ZEROs Do an Initialize and wait 48 hours Issue is resolved Check System Statistics Page in TVGOS DIAG Mode Is HOST Chann or VBI Chann listed in the 90 s Verify that channel has same program as expected host channel It is the same station Use channel editor to change the tune number for the host channel to this channel Do VBI Slicing Test see previous...

Page 18: ...surface oxidation resulting in poor solder spread ability and wet ability The flux is more corrosive The time required for a good solder connection may take longer Poor wet ability can cause solder balls Higher temperatures can cause flux spattering Soldering iron tip life is shortened Dull finish solder joints not shiny can appear to be a cold solder joint In general a tip temperature of 700 F wi...

Page 19: ...7132 Stand Removal 1 Place the TV face down on a soft clean surface with the stand extending over the edge of the table 3 Unplug the motor drive cable from the rear of the TV 4 Remove 4 screws A 4 Remove the stand by sliding it towards the bottom of the TV Unplug Cable A A A A ...

Page 20: ... MODELS LT 37131 LT 37132 LT 46131 LT 46231 Cabinet Back Removal 1 Remove the screws indicated by the arrows on Cabinet Back 2 Lift the Cabinet Back off the TV Example of Arrows indicating screws to be removed ...

Page 21: ...46231 Page 21 PWB Locations and Removal 1 To remove PWBs remove wall mount brackets screws shields and connectors as necessary PWB DM Behind Shield PWB SIGNAL Behind Shield PWB POWER PWB FRONT PWB AT_SW PWBs LED PREAMP WALL MOUNT BRACKETS ...

Page 22: ...7131 LT 37132 LT 46131 LT 46231 PWB Locations and Removal Continued PWB SIGNAL Shield Removed PWB DM Shield Removed PWB E2P Note When replacing the PWB DM transfer the PWB E2P from the old PWB DM to the replacement PWB DM ...

Page 23: ...ottom Disconnect ES from the right side and remove the cable from the wire clamps 4 From the PWB DM remove connectors VR VT 37 and the Ground Screw s B 5 From the TV Chassis Mounting Plate remove 6 Screws C 6 Lift the complete TV Chassis Assembly up and off the LCD Panel Assembly WALL MOUNT BRACKETS 3 Screws Each PD PF ES VR VT 37 Only AT AN CE LE SCREW C SCREW C SCREW C GROUND SCREWS B SCREW C PW...

Page 24: ...s each 2 Remove the PWB AT SW Assembly 2 screws 3 Remove the Upper Panel Mounting Bracket 7 screws 4 Remove the Lower Panel Mounting Bracket 8 screws STAND MOUNTING BRACKET 3 SCREWS STAND MOUNTING BRACKET 3 SCREWS PWB AT_SW ASSEMBLY 2 SCREWS LOWER PANEL MOUNTING BRACKET 8 SCREWS UPPER PANEL MOUNTING BRACKET 7 SCREWS ...

Page 25: ...o secure the cables as original 2 New cushion spacers also supplied should be attached to the replacement panel as original 3 Reverse the Removal Procedure making sure to install all screws with the same type as those removed 4 Dress all wiring harnesses in the original positions DISASSEMBLY LT 46131 LT 46231 Disassembly of the LT 46131 LT 46231 is similar to the LT 37131 LT 37132 Specific details...

Page 26: ...essing of orders will result Critical and Warranty Parts Designation Critical Electrical Components are indicated by Bold Type in the Parts List and in the schematic diagrams by shading Parts Tolerance Codes Refer to the following chart for tolerance characteristics of electrical components MARK B C D F G J K Tolerance 0 1 0 25 0 5 1 2 5 10 MARK M N V X Z P Q Tolerance 20 30 10 40 80 100 30 20 20 ...

Page 27: ...1 921C534002 921C534003 921C534004 PWB FRONT 920D719002 920D719001 920D719003 920D719004 PWB AT_SW 920D723001 920D723001 920D723002 920D723002 PWB LED 920D720001 920D720001 920D720001 920D720001 PWB PREAMP 920D721001 920D721001 920D721001 920D721001 PWB E2P 920D722001 920D722001 920D722001 920D722001 LCD MODULE 289P084010 289P084010 289P085010 289P085010 Remote Control 290P137010 290P137020 290P13...

Page 28: ...040 IC C MOS PIC 18F2510 T I SO021 bd IC7P03 263P154010 IC C MOS SN74HC132DB bd IC7P04 271P023010 IC SN74CBTD1G125DBVR bd IC7P05 276P400010 IC C MOS 74LVC1G125GV bd IC7R01 276P331020 IC C MOS PIC18F1320TI SO bd IC7R02 271P212010 IC LM311M bd IC7R03 271P023010 IC SN74CBTD1G125DBVR bd IC7R04 276P329010 IC C MOS 74HCT4053PWT bd IC7R05 276P334010 IC C MOS MM1108XFBE bd IC7R06 271P023010 IC SN74CBTD1G1...

Page 29: ...P MC2836 T112 1 D2305 262P828010 D CHIP MC2838 T112 1 D2E00 262P163010 D CHIP MALS068X0L bd D2E01 262P163010 D CHIP MALS068X0L bd D2J01 262P163010 D CHIP MALS068X0L D2J02 262P163010 D CHIP MALS068X0L D2J03 262P163010 D CHIP MALS068X0L D2J04 262P163010 D CHIP MALS068X0L D2L41 262P163010 D CHIP MALS068X0L D2L43 262P163010 D CHIP MALS068X0L D2L45 262P163010 D CHIP MALS068X0L D2L47 262P163010 D CHIP M...

Page 30: ... 409P777080 EMI F CHIP BLM21P221S L2238 409P777080 EMI F CHIP BLM21P221S L2255 409P777080 EMI F CHIP BLM21P221S L2287 409P777080 EMI F CHIP BLM21P221S L2289 409P777080 EMI F CHIP BLM21P221S L2294 409P777080 EMI F CHIP BLM21P221S L2295 409P865020 EMI F CHIP BLM11A601S L2296 409P865020 EMI F CHIP BLM11A601S L2297 409P777080 EMI F CHIP BLM21P221S L2298 409P777080 EMI F CHIP BLM21P221S L2329 409P86504...

Page 31: ...CHOKE CHIP ACM2012 L8206 409P777080 EMI F CHIP BLM21P221S L8280 409P865080 EMI F CHIP BLM18PG6 L8306 409P865080 EMI F CHIP BLM18PG6 L8307 409P865080 EMI F CHIP BLM18PG6 L8308 409P865080 EMI F CHIP BLM18PG6 L8310 409P865080 EMI F CHIP BLM18PG6 L8313 409P865080 EMI F CHIP BLM18PG6 L8314 409P865080 EMI F CHIP BLM18PG6 L8318 409P865080 EMI F CHIP BLM18PG6 L8320 409P865080 EMI F CHIP BLM18PG6 L83B3 325...

Page 32: ...002P T2003 409P961010 CHIP FILTER ACM2012D 9002P T2004 409P961010 CHIP FILTER ACM2012D 9002P T2101 409P961010 CHIP FILTER ACM2012D 9002P T2102 409P961010 CHIP FILTER ACM2012D 9002P T2103 409P961010 CHIP FILTER ACM2012D 9002P T2104 409P961010 CHIP FILTER ACM2012D 9002P T2201 409P961010 CHIP FILTER ACM2012D 9002P T2202 409P961010 CHIP FILTER ACM2012D 9002P T2203 409P961010 CHIP FILTER ACM2012D 9002P...

Page 33: ...0 1 16W 82K J 103P480010 1 4W 10 J 103P481070 1 4W 220 J 103P488080 1 4W 4 7 J bd 103P489090 1 4W 75 J 103P409050 1 8W 0OHM 103P402000 1 8W 390 J 265P809010 NCP18XH103F03RB cd RESISTORS Conventional Resistors By Ref Ref Part Part Name Description R8X01 103P141040 R CARBON 1 2W 120 J ab R8X05 103P719050 R CARBON 1 4W 0OHM MAX 3A ab R9A01 109P179010R CEMENT PLATE 6 8 J R9A02 109P179010R CEMENT PLATE...

Page 34: ...d 141P140040 B50V390P KCK1608 141P141070 B50V4700P K 141P140050 B50V470P K 141P141080 B50V5600P K 141P140060 B50V560P K 141P140070 B50V680P K 141P142000 B50V8200P K 141P147040 B6 3V2 2M K 141P147060 B6 3V4 7M K 189P245010 C2012JB1E105K 189P243010 C2012X5R0J106MT 189P243040 C2012X5R0J226MT 189P243030 C3216X5R1E475MT 189P243020 C3225X5R1E106MT 154P345090 CH25V1000P J 154P345030 CH25V560P J bd 154P34...

Page 35: ...A83 189P185090C CER AC250V E2200P M C9A84 154P262000 C CER R2KV 220P K C9A85 154P400030 C CER B1KV 470P K C9A86 142P010090 C CER B500V 470P K C9A89 181P736080 C ELEC 35V 470M M C9A90 181P735030 C ELEC 25V 1000M M 105C C9A96 154P262000 C CER R2KV 220P K C9A97 154P262000 C CER R2KV 220P K C9D01 189P213020C M POLY AC AC250 275V 0 47M M C9D03 189P213020C M POLY AC AC250 275V 0 47M M C9D07 189P213020C ...

Page 36: ...020 QTZ CRYST 8MHZ bd X7R01 285P459030 QTZ CRYST 10MHZ bd X8001 285P464020 QTZ CRYST 26 1621MHz X8201 285P403020 QTZ CRYST 32 768MHZ X8301 285P464010 QTZ CRYST 7 3728MHZ X8403 285P464040 QTZ CRYSTAL 24 576MHz X8501 285P464030 QTZ CRYSTAL 18 24MHz X8G01 299P311010 CERAMIC OSC CSTCG24M0 X8H26 285P426050 QTZ CRYST 10 00MHz Z7K01 938P031010 UNIT PREAMP GP1UM263RK PRINTEDCIRCUITBOARDS 920D719001 ASSY P...

Page 37: ...Page 37 MODELS LT 37131 LT 37132 LT 46131 LT 46231 POWER SUPPLY ...

Page 38: ...Page 38 MODELS LT 37131 LT 37132 LT 46131 LT 46231 DM SIGNAL POWER SUPPLIES ...

Page 39: ...Page 39 MODELS LT 37131 LT 37132 LT 46131 LT 46231 VIDEO SIGNAL PATH ...

Page 40: ...Page 40 MODELS LT 37131 LT 37132 LT 46131 LT 46231 AUDIO SIGNAL PATH ...

Page 41: ...SC0 MUTE AVR GND GND GND A GND GND GND ACLK GND PANELVCC STATUS G GND GND RMC GND A GND GND N C AIN2 RxInO0 PANEL PWR STATUS R N C VINV GND PANELVCC 3DRST 21VAUD AVR L IN3 Y AIN2 RxInO1 G VID GND GND STATUS G GND PANELVCC PA AIN3 AT R E GND ACLK RxInO1 GND INPUT DET0 V 5VSB BIN0 GND PANELVCC PA ACLK INV RELAY E TU1 R RxInOCLK V SW BIN2 GND PA H PANELVCC INV SHORT MOTOR R AVR R RxInO2 GND BCLK S SW...

Page 42: ... M X1 Y2 L9A36 10MH PA4 PF11 2SC3052 T112 1E F Q9A02 PH1 200V C9A04 330 16V C9A36 1000U 0 56 2W R9A19 0 01 C9A87 25V 50V 8 2K 1 16W R9A53 0 01 C9D16 25V 50V 330 1 16W R9A67 K9A20 LKS1AF 12V 1 S1 2 S2 3 C1 4 C2 1 8K J 1 2W R9A44 PA10 F9A03 125V 7A 10 1 2W R9A71 C9A13 0 068 C9A69 25V 3300P J C9A28 630V 16V C9A54 470U PA11 18K 1 2W R9A36 1 2 3 4 6 8 10W R9D01 0 39 2W R9A63 L9A07 2 7MH 470 3W R9A77 16...

Page 43: ... 1U C3J19 10V 6 3V INPUT DET1 1U C3J03 10V 6 3V 1U C3J38 10V 6 3V 68K 1 16W R2L77 120K 1 16W R2L41 9VB 1U C3J42 10V 6 3V 1U C3J11 10V 6 3V C2L65 100 6 3V INPUT DET0 COMP3 Pb 120K 1 16W R2J61 1 16W R2L73 4 7K 68K 1 16W R2L65 L2L45 BLM21B272S 5VSDA L2L41 BLM21B272S R2J20 120K 1 16W C2L64 220 6 3V CE GND1 1U C3J10 10V 6 3V 1U C3J05 10V 6 3V 1 16W R3J25 100 1 16W R2L08 2K 2SA1235A T112 1E F Q2L51 10K ...

Page 44: ... S33 0 01 C2KP2 25V 50V DB S47 DA S7 10K 1 16W R3E66 DA S25 DA S41 0 01 C2KN5 22K 1 16W R2KE1 2SC3052 T112 1E F Q3E05 10 1 16W R3E45 2SA1235A T112 1E F Q3E01 0 01 C2KQ6 25V 50V 16V C2KS3 47 10K R2K42 0 047 C2K18 16V 25V 2200 C2K40 50V 1U C2K04 10V 6 3V 100K 1 16W R3E61 NC 3 4 5 6 7 8 9 10 1 75 1 16W R2K06 75 1 16W R2K07 75 1 16W R2K09 75 1 16W R2K51 75 1 16W R2K53 75 1 16W R2K54 75 1 16W R2K56 75 ...

Page 45: ...35 470 0 1 C2M70 16V 15 C2M30 50V 2SC3052 T112 1E F Q2M42 2SC3052 T112 1E F Q8H22 1 5K 1 16W R2M38 0 1 C2M81 16V 1 16W R2M50 56 IC9M02 3 3VB L8H03 221 OHM 2SC3052 T112 1E F Q2M21 1 16W R8T85 100 470 C8H27 25V 50V 3D V 330 1 16W R2M43 0 1 C2M53 16V L2M40 221 OHM 3DRST 1K 1 16W R2M52 300 1 16W R2M36 1 16W R8H37 100 22 C2M42 50V 22 C2M47 50V 22 C2M48 50V 120 1 16W R2M53 0 47 C8H28 10V 1 16W R2M21 100...

Page 46: ...S612BT S7L10 KSHS612BT S7L09 KSHS612BT S7L08 KSHS612BT S7L07 KSHS612BT S7L06 KSHS612BT S7L05 KSHS612BT S7L04 KSHS612BT MC2838 T112 1 D7K22 D7L03 SML1216W C D 1 2 3 EC21QS04 TE12L D8X01 SFH2505FA MI D7K21 D7L01 SEL2E10C REMOCON PRE AMP UNIT IN3 R IN3 V IN3 C V SW IN3 Y IN3 L S SW GND GND GND GND GND OUTA OUTB INB INB INA V INA V 11 12 VCC SCL SDA WC VSS E0 E1 E2 VCC SCL SDA WP VSS A0 A1 A2 VCC A1 S...

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