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LG M1994A-PTJ Service Manual

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LCD MONITOR TV

SERVICE MANUAL

CHASSIS : LN73A
MODEL : M1994A
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
North/Latin America
Europe/Africa
Asia/Oceania
M1994A-PTJ
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com

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Summary of Contents for LG M1994A-PTJ

  • Page 1: Service Manual

    Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LCD MONITOR TV SERVICE MANUAL CHASSIS : LN73A MODEL : M1994A M1994A-PTJ CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    TROUBLE SHOOTING ................17 BLOCK DIAGRAM...................23 DESCRIPION OF BLOCK DIAGRAM .............24 RIPS BOARD BLOCK DIAGRAM ............25 EXPLODED VIEW .................. 26 SVC. SHEET ....................Copyright LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Precautions

    An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Servicing Precautions

    Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the Copyright LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Copyright LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specification

    Hard coating(3H) & Anti-glare(Haze 25) Operating Mode Normally White Backlight Unit 4 CCFL(4 lamps) Response Time 2.6ms(Typ.), 7.4ms(Max.) Typ. Copyright 2008 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 Humidity : 20 % ~ 80 % Storage Environment Temp : -10°C~60°C non condensing Humidity : 5 % ~ 90 % non condensing Copyright 2008 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 0.283 0.313 0.343 In RGB-PC input Full White 100IRE 0.299 0.329 0.359 9300k 0.253 0.283 0.313 0.268 0.298 0.328 Copyright 2008 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 HDM I Input (1EA) HMDI-DTV 480p, 576p, 720p, 1080i 10. Audio Input (3 EA) CVBS, PC Audio, Component L/R Input Copyright 2008 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 37.50 50.00 74.25 720p 1920*1080 33.72 59.94 74.176 1080i 1920*1080 33.75 60.00 74.250 1080i 1920*1080 28.125 50.00 74.250 1080i Copyright 2008 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 1920*1080 33.72 59.94 74.176 1080i 1920*1080 33.75 60.00 74.250 1080i 1920*1080 28.125 50.00 74.250 1080i 10.13 EDID Data **** Copyright 2008 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 1080i 1920*1080 33.75 60.00 74.250 1080i 1920*1080 28.125 50.00 74.250 1080i 11.3 EDID Data ** ** ** *** ***** Copyright 2008 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 ***: year ex) when year 2008 : input “12” **** : CHECK SUM (deferent along Serial No, week, year) Copyright 2008 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...

  • Page 14: Adjustment Instruction

    *Manual ADC process using Service Remocon. After enter Service Mode by pushing “INSTART” key, execute “Auto-RGB” by pushing “ ” key at “Auto-RGB”. filexxx.bin Copyright LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 • Confirm whether luminance over 200cd/m2 • Set ACC : 9300k • Confirm whether x = 0.283±0.03, y = 0.298±0.03 or not. Copyright LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 OK if the value of adding 128-bytes Data is Zero) START Data1 . . . Data128 STOP 5. EEPROM DATA Copyright LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...

  • Page 17: Troubleshooting

    IC301,IC400 IC301, IC200 IC208(1.8V) Pass Pass Change IC206, IC208 Fail Change LED Assy. Check LED Assy. Pass Check P201 Connector. Copyright LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 Chage R305 of R305 Pass Fail Check the LVDS Change Module. Output of IC301 Pass Check Input source Cable and Jack. Copyright LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 Re-soldering or Change the Check the input/output defect part, Check the X300 of IC301. Pass Check input source cable and jack. X300 Copyright LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
  • Page 20 Re-soldering or Change the Check the input/output defect part, Check the X300 of IC301. Pass Check input source cable and jack. X300 Copyright LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
  • Page 21 Check Ourput of Re-soldering or change the IC206, IC208 defect part, Check the X300 X300 Pass Check input source cable and jack. Copyright LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 Check the input/output defect part. of IC204 Pass Fail Change Speker. Check the Speaker Pass Check the Speaker wire. X300 Copyright LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...

  • Page 23: Block Diagram

    BLOCK DIAGRAM Copyright 2008 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...

  • Page 24: Description Of Block Diagram

    The audio signal is amplified according to pre-defined DC volume control curve. Also, headphone amplifier is included at this IC. Copyright LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...

  • Page 25: Rips Board Block Diagram

    6. Signal collection. This part function is to collect the any change from the DC output and feed back to the primary through photo transistor. Copyright LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...

  • Page 26: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...

  • Page 27: Schematic Diagram

    SCHEMATIC DIAGRAM MAIN Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only -27- Only for training and service purposes...
  • Page 28 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only -28- Only for training and service purposes...
  • Page 29 JP204 L202 UBW2012-601F HEADPHONE_OUT_R JP205 L201 UBW2012-601F LED_BL JP206 L203 UBW2012-601F LED_AM JP208 L204 UBW2012-601F JP209 R203 L205 READY JP210 UBW2012-601F ST_5V Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only -29- Only for training and service purposes...
  • Page 30 INPUT Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only -30- Only for training and service purposes...
  • Page 31 DC VOLTAGE Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only -31- Only for training and service purposes...
  • Page 32 TUNER Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only -32- Only for training and service purposes...
  • Page 33 SOUND AMP Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only -33- Only for training and service purposes...
  • Page 34 HDMI & DVI Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only -34- Only for training and service purposes...
  • Page 35 Oct., 2008 P/NO : MFL57043803 Printed in Korea...

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M1994aM2294a

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