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JVC LT-26C31BJE Service Manual
JVC LT-26C31BJE Service Manual

JVC LT-26C31BJE Service Manual

Lcd flat television
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SERVICE MANUAL
11
2003
YA014
LT-26C31BJE, LT-26C31BUE,
LT-26C31SJE, LT-26C31SUE
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-45
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
LCD FLAT TELEVISION
TABLE OF CONTENTS
BASIC CHASSIS
MK
No.YA014
2003/11

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Summary of Contents for JVC LT-26C31BJE

  • Page 1 SERVICE MANUAL LCD FLAT TELEVISION YA014 2003 LT-26C31BJE, LT-26C31BUE, LT-26C31SJE, LT-26C31SUE BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS FEATURES 2.1.1 FUNCTION / CIRCUITS EXT-1 EXT-3 EXT-4 • DIST (Digital Image Scaling Technology) employs an interpolation method that doubles the scanning lines to realize 1250-line flicker- free picture making it especially suitable for reproducing high- resolution pictures even on large-screen displays.
  • Page 3: Service Menu Screen

    REPLACEMENT OF MEMORY IC This unit uses the nonvolatile memory IC.The memory IC memories data for video and deflection circuits. To replace the memory IC without the data written, malfunctions might occurred while power is on, and the normal image might not appear. When replacing the memory IC, be sure to use the IC written with the initial values of data.
  • Page 4 3.2.3.2 USER SETTINGS OF MENU Setting item Setting value Setting item Setting value POWER SOUND SETTING CHANNEL A. H. B BASS Center PRESET CHANNEL Refer to TREBLE Center OPERATING INSTRUCTIONS BALANCE Center VOLUME SPEAKER PICTURE SETTING PICTURE MODE BRIGHT 3D SOUND COLOUR TEMP.
  • Page 5 3.2.3.4 SERVICE MENU SETTING ITEMS Setting item Setting value Setting item Setting value 1.IF 1.VCO 6.STATUS (Do not adjust) 2.ATT ON/OFF 2.V/C 1.CUT OF R 7.VNR 1.MYLV 2.CUT OF G (Do not adjust) 2.ONMVF 3.CUT OF B 3.MYCOR 4.DRIVE R 4.MYGA 5.DRIVE G 5.YEGON...
  • Page 6: Block Diagram

    BLOCK DIAGRAM IC501 IC6401 MULTI VOLUME SOUND CONTROL MHP_L/R L/R OUT PROCESSOR HEADPHONE MAIN SPEAKER(L) IC6501 IC6641 AUDIO AUDIO L/R OUT CONTROL MAIN SPEAKER(R) TU001 MAIN SC1_OUT_L TV V1 MI-COM & DIST PWB U/V FRONTEND SC1_OUT_R S_L/S_R MAIN CV/Y MAIN CV/Y IC702 MAIN C MAIN C...
  • Page 7: Circuit Diagrams

    CIRCUIT DIAGRAMS TUNER PWB CIRCUIT DIAGRAM SHEET 1 NCF31AZ-105X C010 TUNER PWB ASS'Y SMK0R601A-U2 R005 R004 CN004 QGB2038J1-09 M_SW0 M_SW1 VTV1 AFC1 L003 M_MONO NQL034K-100X C008 C009 1000 /6.3 MSP PWB SHEET 2 CN005 QGB2038J1-09 L002 NCB31HK-103X C006 NQL034K-100X SDA1 C007 SCL1 L001...
  • Page 8 MSP PWB CIRCUIT DIAGRAM SHEET 2 RECEIVER PWB (1/2) SHEET 3 MSP PWB ASS'Y SMK0A601A-U2 C536 C537 QENC1EM-106Z QENC1EM-106Z IC502 AN77L08-T C525 C526 C529 C530 .001 .001 C541 C542 C528 C527 .001 .001 SIF_GND R522 SIF_GND Q503 C524 DTC144EKA-X R516 QGB2038K1-09 C535 C531...
  • Page 9 RECEIVER PWB CIRCUIT DIAGRAM ( 1/2 ) SHEET 3 R308 R310 L_SWMAIN AUDIO OUT C309 QNN0595-001 R316 NCB11CK-225X C312 D311 R306 C307 Q313 UN2110-X J401 D308 Q311 R312 MA111-X .0047 OPEN QETN1EM-476Z UN2226-X R313 R314 C310 NCB21CK-105X OPEN R309 Q314 QNN0595-001 2SA1530A/QR/-X R311...
  • Page 10 RECEIVER PWB CIRCUIT DIAGRAM ( 2/2 ) SHEET 4 IC6101 AN77L12-T D6101 AU_12V OPEN K6103 C6103 C6102 C6101 OPEN AU_GND R6105 R6106 R6107 R6108 CN000F QGA2001C2-04V AU_VCC R6541 K6101 5.6K NQR0413-002X VREF IC6641 AU_D_VCC POWER PWB (2/2) TA2024ASE-X C6104 K6102 C6606 SHEET 19 D6541...
  • Page 11 VIDEO PWB CIRCUIT DIAGRAM ( 1/2 ) SHEET 5 C830 C831 C832 C833 C834 C835 R820 R824 R828 R832 R836 R840 SRGB2/OTH 150K 150K 150K 150K 150K 150K SHEET 6 SRGB2/OTH R822 R826 R830 R834 R838 R842 CN0AE VIDEO PWB ASS'Y(1/2) Q803 Q804 Q805...
  • Page 12 VIDEO PWB CIRCUIT DIAGRAM ( 2/2 ) SHEET 6 RECEIVER PWB (1/2) SHEET 5 SHEET 3 SHEET 5 CN00N QGA1501C2-07V 3.3V VCC9A IC1202 SN74AHC2G08T-X AD_HD R1216 C1208 J1202 C1207 QNN0595-001 NCF11CZ-475X IC1201 TA1370FG-X IC1101 R1124 AN15851A-W NR_HD Q1101 C1101 R1215 2SC2412K/QR/-X TEXT_G NR_Y...
  • Page 13 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 1/11 ) SHEET 7 FOR PROGRAM CN00C1 CN00C2 QGA1501F2-07V QGA2001F2-05V R091 R093 MI-COM & DIST PWB ASS'Y(1/11) R094 R092 R143 OPEN SBD01 SMK0Z601A-U2 SBO01 SHEET 15 VCC3A 2SA1022/BC/-X C058 TC7WH126FU-X R141 SMGND D006 SMRST OPEN IC007...
  • Page 14 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 2/11 ) SHEET 8 C741 C742 C743 C744 C745 C746 VCC3D R731 R735 R739 R743 R710 R714 C1341 150K 150K 150K 150K 150K 150K R733 R737 R741 R745 R712 R721 R1341 Q712 Q713 Q714 Q715 Q716...
  • Page 15 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 3/11 ) SHEET 9 IC301 R1170H251B-X VCC5A VC2.5_1YC VCAVDYC L1002 LC1051 NQR0450-008X NQR0413-003X VC5YC NBE71CM-476X VCC9A R1003 C1004 C1005 C1006 L1004 C1007 C1003 NQR0413-003X NCB21AK-105X AGND C1001 C1002 NCB21CK-334X AGND AGND AGND LC1052 NQR0450-008X VCVINYC AGND...
  • Page 16 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 4/11 ) SHEET 10 SHEET 7 OSD_B SHEET 16 OSD_G VCC5A VCC9A VCC9AMAD LC1201 NEH91CM-476X EFP5 C1321 NQR0415-005X IC1205 VCC5D Q1201 Q1202 AGND C1252 TC4053BF/N/-XE LC1206 2SC2412K/QR/-X 2SC2412K/QR/-X EFP5 C1322 R1209 R1201 C1202 NDC31HJ-120X C1251 C1201...
  • Page 17 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 5/11 ) SHEET 11 VCC9A VCC9ASAD L4025 EFP5 MI-COM & DIST PWB ASS'Y(5/11) NQR0415-005X Q4002 SMK0Z601A-U2 AGND 2SA1022/BC/-X VCC3A VCC3D R4008 Q4001 C4008 R4047 R4011 2SC3837K/NP/-X 1.5k C4004 OPEN R4046 K4301 NCB31EK-393X YS_IN K4302 SHEET 10 NQR0413-003X...
  • Page 18 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 6/11 ) SHEET 12 C4356 C4355 C4354 C4362 R4343 0.47 IC4107 LP3964EMP-ADJ-X R4268 R4267 R4344 R4281 R4282 VCC2.5 RA122 RA122 RA122 RA122 VCC1.4B DQ103 DQ014 DQ100 DQ010 DQ104 DQ013 R4362 DQ101 DQ011 DQ28 C4341 R4270 R4269...
  • Page 19 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 7/11 ) SHEET 13 SHEET 14 IC4203 R1170H151B-X VCC2.5 VCC3D NRSA63D-562X R4492 R4493 R4494 R4495 R4496 R4497 R4498 R4499 R4474 RA101 RA101 RA101 RA101 RA101 RA101 RA101 RA101 5.6k R4476 OPEN R4473 C4424 L4201 R4475 NCB10JK-106X...
  • Page 20 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 8/11 ) SHEET 14 DOSDR0 DOSDR0 DOSDR1 DOSDR1 DOSDR2 DOSDR2 DOSDR3 DOSDR3 RGBHD DOSDR4 RGBHD DOSDR4 DOSDR5 RGBCLK DOSDR5 RGBCLK DOSDR6 DOSDR6 DOSDR7 DOSDR7 AJR0 VCC3D AJR0 DOSDB0 VCC2.5PDP AJR1 DOSDB0 AJR1 VCC3D DOSDB1 AJR2 DOSDB1...
  • Page 21 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 9/11 ) SHEET 15 VCC5STB Y7801 OPEN VCC3D Y7802 NRSA63J-0R0X R7822 DSDHD SHEET 13, 14 DSDHD R7823 DSDVD SHEET 16 DSDVD K7801 SHEET 7 NQR0351-001X AGND SMGND K7804 SMRST SMRST NQR0351-001X VCC5/3 DGND SMGND VCC5/3 NCB11AK-106X...
  • Page 22 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 10/11 ) SHEET 16 VCC3A K7303 R7333 NQR0351-003X R7332 C7335 C7348 L7305 NQL092K-R10X OPEN R7342 L7304 NQL092K-R10X RGB_PWM OSD_B L7303 NQL092K-R10X L7306 NQL092K-2R2X C7336 RGB_BLK C7347 C7343 C7342 OPEN C7341 Q7301 2SA1022/BC/-X R7335 SHEET 14 RGBCLK C7344...
  • Page 23 MI-COM & DIST PWB CIRCUIT DIAGRAM ( 11/11 ) SHEET 17 LB_PRO STB_5V LB_POW D1903 OPEN SDA0P SDA0P SHEET 10 SCL0P SCL0P IC1901 CN000B QGA1501C2-13V PQ070XH02Z-W LC110 OPEN IC1903 R1906 OPEN R1902 2.2K R1901 NRSA63D-222X 2.2K AGND R1907 NRSA63D-222X OPEN D1901 C1913 /6.3...
  • Page 24 POWER PWB CIRCUIT DIAGRAM ( 1/2 ) SHEET 18 R9001 QRZ9046-105Z LF9001 C9002 LF9002 QMF51D2-6R3-J1 QQR1281-004 QQR1281-004 QFZ9075-105 CN000D CN00PW OPEN NOT USE L9201 QQR1399-001 QGA7901C1-02 VA9001 LF9003 ERZV10V621CS QQR1376-001 LC32378-001A C9001 R9201 QFZ9075-225 C9201 C9204 CP9211 .0022 .0022 QRZ0121-200 QMFZ043-5R0Z-J1 QCZ9082-222Z QCZ9082-222Z...
  • Page 25 POWER PWB CIRCUIT DIAGRAM ( 2/2 ) SHEET 19 LCD PANEL (INVERTER PWB) CN000P CN000Q GND2 R9605 R9606 CN000Y OPEN OPEN POWER PWB ASS'Y(2/2) Y9547 D9602 COOLING FAN OPEN SMK-9601A-U2 H9541 IC9601 OPEN OPEN CN000Z LC32377-001A C9603 OPEN OPEN Y9548 C9541 680p OPEN...
  • Page 26 REGULATOR PWB CIRCUIT DIAGRAM SHEET 20 REGULATOR PWB ASS'Y SMK-9611A-U2 IC9801 SI-8090JD-W R9807 4.7K C9815 R9808 L9802 NEH91CM-476X GND2 NQL63EM-101X L9801 D9802 OPEN C9802 R9802 C9804 R9805 R9809 OPEN GND2 C9803 OPEN OPEN MA111-X 1/2W NBZ0010-396X R9801 D9801 D9809 EC30HA03L-X PTZ11B-X K9801 R9803...
  • Page 27 FRONT CONTROL PWB CIRCUIT DIAGRAM SHEET 21 CN300T QGA1501C2-10W FRONT CONTROL PWB ASS'Y S8707 QSW0797-001 SMK0L601A-U2 MI-COM & DIST PWB (1/11) S8703 S8702 S8701 SHEET 7 QSW0797-001 QSW0797-001 QSW0797-001 R8701 R8702 5.6k CN3003 QGB2542K1-08 S8706 S8705 S8704 QSW0797-001 QSW0797-001 QSW0797-001 FRONT SENSOR PWB SHEET 22 R8703...
  • Page 28 FRONT SENSOR PWB CIRCUIT DIAGRAM SHEET 22 IC8751 CN8003 OPEN QGB2542J1-08 FRONT CONTROL PWB SHEET 21 R8751 OPEN R8754 OPEN R8752 OPEN R8753 C8751 OPEN OPEN R8759 IC8752 GP1UM281QK R8756 STB5V R8755 OPEN C8753 C8752 OPEN R8758 R8757 OPEN FRONT SENSOR PWB ASS'Y SMK0L602A-U2 NOTES) 1.
  • Page 29: Voltage Charts

    VOLTAGE CHARTS <MI-COM & DIST> [P.2-17 - P.2-18] [P.2-19 - P.2-20] [P.2-21 - P.2-22] [P.2-23 - P.2-24] [P.2-25 - P.2-26] [P.2-27 - P.2-28] [P.2-31 - P.2-32] [P.2-33 - P.2-34] [P.2-35 - P.2-36] MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE...
  • Page 30 <TUNER> <RECEIVER> <POWER> [P.2-5 - P.2-6] [P.2-9 - P.2-12] [ P.2-39 - P.2-42 ] MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE DC ( V ) DC ( V ) DC ( V ) DC ( V ) DC ( V ) DC ( V ) DC ( V )
  • Page 31 WAVEFORMS -TUNER PWB- -RECEIVER PWB- [ P.2-9 - P.2-10 ] [P.2-5 - P.2-6] TU001-16 IC101-15 IC101-41 IC101-44 IC101-47 IC101-49 IC101-53 IC101-56 IC101-58 IC101-63 0.9Vp-p 1.0Vp-p 2.0Vp-p 2.0Vp-p 1.5Vp-p 2.2Vp-p 2.2Vp-p 2.2Vp-p 1.5Vp-p 0.9Vp-p -VIDEO PWB- [P.2-13 - P.2-14] IC801-1 IC801-3 IC801-4 IC801-5 IC801-7...