LG Flatron L1972H Service Manual
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LG Flatron L1972H Service Manual

LG Flatron L1972H Service Manual

Color monitor
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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM74B
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website:http://biz.LGservice.com
L1972H(L1972H-PFS.A**OAP)
Internal Use Only
*To apply the MSTAR Chip.

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Summary of Contents for LG Flatron L1972H

  • Page 1 Internal Use Only Website:http://biz.LGservice.com COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM74B MODEL: L1972H(L1972H-PFS.A**OAP) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the MSTAR Chip.

  • Page 2: Table Of Contents

    SERVICE OSD ..................13 TROUBLE SHOOTING ................14 BLOCK DIAGRAM...................21 EXPLODED VIEW ...................24 REPLACEMENT PARTS LIST ............... 26 SVC. SHEET ....................Copyright 2007 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Precaution

    CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. Copyright 2007 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Servicing Precautions

    8. Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last. Copyright 2007 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 IC. circuit board to prevent excessive component temperatures. Copyright 2007 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
  • Page 6 Solder the overlapped area and clip off any excess jumper wire. Copyright 2007 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...

  • Page 7: Specification

    : 6.5 kg (11.25 lbs) Horizontal(Analog) : 30 ~ 83kHz Horizontal(Digital) : 30 ~ 71kHz Vertical : 56 ~ 75Hz Copyright 2007 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...

  • Page 8: Timing Chart

    1280 x 1024 V(Lines) 60.02 1066 1024 H(Pixels) 135.0 79.976 1688 1280 1280 x 1024 V(Lines) 75.035 1066 1024 Copyright 2007 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...

  • Page 9: Disassembly

    1. Pull the front cover upward. 2. Then, let the all latches are separated. 3. Put the front face down. Disassemble back cover. Copyright 2007 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...

  • Page 10: Adjustment

    Save sRGB Color by commanding COLOR SAVE itself. Command code. # Caution) Must keep power-on more than 3 seconds after AC Power-on first time. Copyright 2007 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 Video Signal.(refer to Spec at Page 11) 3.2.5.8. DDC EDID Write ( Set as Aging mode ON, by commanding AGING_ON/OFF command code. ) Copyright 2007 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 Click “ Write” button c) Remove all default number d) Add 300-3FF e) Click Start button. f) Click Exit button. Copyright 2007 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...

  • Page 13: Service Osd

    (110V/220V) 74LS06 Power LED 4.7K 74LS06 ST Switch V-Sync On/Off Switch (Switch must be ON.) Figure 1. Cable Connection Copyright 2007 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...

  • Page 14: Trouble Shooting

    IS U901 PIN2(3.3V) U902(1.8V) LINE U902 PIN2(1.8V) CHECK X501 PIN127 CHECK CRYSTAL(X501) PULSE CHECK IC501 Waveforms J905-#5,6 IC901-#2 IC902-#2 IC501-#127 Copyright 2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 WIRE OF THE LCD MODULE Waveforms J905-#5,6 J905-#9 REPLACE LCD MODULE J905-#9 (Brightness 100) J905-#10 (Brightness 0) LAMP CURRENT Copyright 2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 PIN33(V-SYNC). FROM D-SUB TO IC501 IS PULSE APPEARED AT SIGNAL PINS? TROUBLE IN CABLE OR LCD MODULE Waveforms IC501-#30 Copyright 2007 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 APPEARED? CHECK IC501 PIN 32,33 CHECK H/V SYNC LINE SYNC PULSE TROUBLE IN IC501 Waveforms 1 H-SYNC 2 V-SYNC Copyright 2007 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 Check Q101 Drain Trouble in Q101 Waveform Check D201, D202 Trouble in D201, D202 Voltage CHECK 5V, 12V Line Copyright 2007 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 If waveform is no problem Check Q303~Q308 Check U303, U304 Or Trouble in U303, U304 Drain waveform CHECK T301, T302 Copyright 2007 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...

  • Page 20: Block Diagram

    BLOCK DIAGRAM Copyright 2007 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...

  • Page 21: Block Diagram

    BLOCK DIAGRAM-POWER Copyright 2007 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...

  • Page 22: Description Of Block Diagram

    The Micom distinguishes polarity and frequency of the H/V sync are supplied from signal cable. The controlled data of each modes is stored in EEPROM. Copyright 2007 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only...

  • Page 23: Lips Board Block Diagram

    This part function is to collect the any change from the DC output and feed back to the primary through photo transistor. Copyright 2007 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...

  • Page 24: Exploded View

    EXPLODED VIEW Copyright 2007 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...

  • Page 25: Exploded View Parts List

    Auto Insert PCB Assembly,Sub, CONTROL T.T LM74B L1972H . . EBR38153501 PCB Assembly, POWER T.T --- L1954T -- ---- or EAY38800201 Power Supply Assembly, PLLM-M605A FREE L1954T/L1972H/L197W 19"/ 19"W LCD MNT LCD LG INNOTEK 4 lamp lips board LG INNOTEK CO. LTD. EBU39939501 Main Total Assembly, L1972H BRAND LM74B...

  • Page 26: Replacement Parts List

    "Capacitor,Ceramic,Chip0603B104K16" C322 0CH3103K516 "Capacitor,Ceramic,ChipC2012Y5P1H1" C534 0CK104CF56A "Capacitor,Ceramic,Chip0603B104K16" C323 0CH5221K416 "Capacitor,Ceramic,Chip0805N221J50" C535 0CK104CF56A "Capacitor,Ceramic,Chip0603B104K16" C401 EAE36975601 "Capacitor,Ceramic,RadialDCG150J26" C536 0CK104CF56A "Capacitor,Ceramic,Chip0603B104K16" Copyright 2007 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
  • Page 27 "Diode,Rectifier2A05 600V 1V 50UA" U201 0IPMG78424A "IC,Voltage RegulatorAZ431-A 20V_4" D105 0DRTW00274A "Diode,Rectifier2A05 600V 1V 50UA" U301 EAN36961401 "IC,PWM ControllerOZ9938GN 4.5VTO5" Copyright 2007 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...
  • Page 28 R201 0RX0102K665 "Resistor,Metal Oxide FilmRSD02F4J" R507 0RJ0562D677 "Resistor,ChipMCR03EZPJ560 56OHM 5" R202 0RX0242K665 "Resistor,Metal Oxide FilmRSD02F4J" R508 0RJ4701D677 "Resistor,ChipMCR03EZPJ472 4.7KOHM" Copyright 2007 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...
  • Page 29 0RJ1000D677 "Resistor,ChipMCR03EZPJ101 100OHM" 302-987A PlatePRESS SPTE-C T0.3 INTERFACE R735 0RJ2001D677 "Resistor,ChipMCR03EZPJ202 2KOHM 5" SC101 6620K00020A "Jack,DC PowerSA-4S-320 ANGLE DIP" Copyright 2007 LG Electronics. Inc. All right reserved. - 29 - LGE Internal Use Only Only for training and service purposes...
  • Page 30 DESCRIPTION / SPECIFICATION T101 EBJ38179301 "Transformer,SwitchingBCK-42802-HA" T301 EBJ36896701 "Transformer,SwitchingEEL-22 EEL22" TH101 6322A00035A "Thermistor,NTC10D2-07 10OHM 15% 2" X501 6212AA2004F CrystalHC-49/U 14.31818MHZ 30PPM( Copyright 2007 LG Electronics. Inc. All right reserved. - 30 - LGE Internal Use Only Only for training and service purposes...

  • Page 31: Printed Circuit Board

    PRINTED CIRCUIT BOARD MAIN (TOP) MAIN (BOTTOM) Copyright 2007 LG Electronics. Inc. All right reserved. - 31 - LGE Internal Use Only Only for training and service purposes...
  • Page 32 POWER CONTROL Copyright 2007 LG Electronics. Inc. All right reserved. - 32 - LGE Internal Use Only Only for training and service purposes...
  • Page 33 1. SCALER Copyright 2007 LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Only for training and service purposes...
  • Page 34 2. POWER & WAFER Copyright 2007 LG Electronics. Inc. All right reserved. - 34 - LGE Internal Use Only Only for training and service purposes...
  • Page 35 3. CONTROL Copyright 2007 LG Electronics. Inc. All right reserved. - 35 - LGE Internal Use Only Only for training and service purposes...
  • Page 36 Jun. 2007 P/NO : MFL38456753 Printed in Korea...

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