AOC LM-729 Service Manual
AOC LM-729 Service Manual

AOC LM-729 Service Manual

17” lcd monitor
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LM-729 Service Manual
Rev: A

SERVICE MANUAL

17" LCD Monitor
LM-729
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE
EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT
GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION
AND DISCLAIMS RE LIABILITY FOR CHANGES, ERRORS OR OMISSIONS.

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Summary of Contents for AOC LM-729

  • Page 1: Service Manual

    LM-729 Service Manual Rev: A SERVICE MANUAL 17” LCD Monitor LM-729 THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION...
  • Page 2 LM-729 Service Manual Rev: A Prepared: Shiwei Date: Jul-30-03...
  • Page 3: Revision History

    LM-729 Service Manual Rev: A Revision History Revision Date Page Items Modification First version release; Date:Jul-30-03...
  • Page 4: Table Of Contents

    LM-729 Service Manual Rev: A Table of Contents Table of Contents ---------------------------------------------------------------------------------------------------3 1. MONITOR SPECIFICATIONS ---------------------------------------------------------------------------5 2. LCD MONITOR DESCRIPTION ---------------------------------------------------------------------------6 3. OPERATING INSTRUCTIONS ---------------------------------------------------------------------------7 3.1 GENERAL INSTRUCTIONS -------------------------------------------------------------------------7 3.2 CONTROL BUTTONS ------------------------------------------------------------------------------------7 3.3 ADJUSTING THE PICTURE--------------------------------------------------------------------------------7 4. Input/Output Specification - -------------------------------------------------------------------------------10 4.1 Input Signal Connector...
  • Page 5 LM-729 Service Manual Rev: A 5.3.2 Inverter/Power Board -------------------------------------------------------------------------------------19 6. Schematic -------------------------------------------------------------------------------------------------------21 6.1 Main Board -----------------------------------------------------------------------------------------------21 6.2 AUDIO Board -----------------------------------------------------------------------------------------25 6.3 Key Board ------------------------------------------------------- ---------------------------------------26 6.4 Inverter/Power Board -----------------------------------------------------------------------------------27 7. PCB Layout -------------------------------------------------------------------------------------------------29 7.1 Main Board -----------------------------------------------------------------------------------------------29 7.2 Inverter/Power Board -----------------------------------------------------------------------------------31 7.3 Keypad Board And Audio board-------------------------------------------------------------------------34...
  • Page 6: Monitor Specifications

    LM-729 Service Manual Rev: A 1.MONITOR SPECIFICATIONS Driving system TFT Color LCD LCD Panel Size 43.2cm(17.0") Pixel pitch 0.264mm( H )x 0.264mm( V ) Viewable angle 90˚ (H) 90˚ (V) Response time (typ.) 25 ms Video Analog /Digital Input Sync. Type...
  • Page 7: Lcd Monitor Description

    LM-729 Service Manual Rev: A 2. LCD MONITOR DESCRIPTION The LCD MONITOR will contain a main board, an inverter/power board, keypad board , Audio board and external power adapter which house the flat panel control logic, brightness control logic and DDC.
  • Page 8: Operating Instructions

    LM-729 Service Manual Rev: A 3. OPERATING INSTRUCTIONS 3.1 GENERAL INSTRUCTIONS Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the monitor. By changing these settings, the picture can be adjusted to your personal preferences.
  • Page 9 LM-729 Service Manual Rev: A OSD Table: Description Main Main Sub Menu Adjust Reset Value Menu Item Menu Icon Item Menu Range Icon Luminance Contrast Contrast from Digital-register. 0-100 Recall Cool Contrast Value Brightness Backlight Adjustment 0-100 Recall Cool Brightness Value...
  • Page 10 LM-729 Service Manual Rev: A Language English Set OSD display language to The Language will English. be set to English. Deutsch Set OSD display language to German. Français Set OSD display language to French. Español Set OSD display language to Spain.
  • Page 11: Input/Output Specification

    LM-729 Service Manual Rev: A 4. Input/Output Specification 4.1 Input Signal Connector 4.1.1 Analog D-SUB Connector PIN NO. DESCRIPTION DESCRIPTION PI N NO. Green Detect Cable Blue Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground VGA connector layout 4.1.2 DVI-D Connector...
  • Page 12: Factory Preset Display Modes

    LM-729 Service Manual Rev: A 4.2 Factory Preset Display Modes VESA MODES Horizontal Vertical Nominal Sync Nominal Sync Nominal Pixel Mode Resolution Total Frequency Polarity Freq. Polarity Clock +/- 0.5kHz +/- 1 Hz (MHz) 640x480@60Hz 800 x 525 31.469 59.940 25.175...
  • Page 13: Power Supply Requirements

    LM-729 Service Manual Rev: A 4.3 Power Supply Requirements 4.3.1 Input Requirements PARAMETER RANGE CONDITION Input AC Voltage 100 to 240VAC RMS Universal input full range Input Frequency 60Hz @ 100VAC to 50Hz @ 240VAC Input Current Less than 2.0 Amps RMS Input voltage 100 VAC RMS ;...
  • Page 14: Panel Specification

    LM-729 Service Manual Rev: A 4.4 PANEL SPECIFICATION 4.4.1 Panel Feature -High contrast ratio, high aperture structure -TN(Twisted Nematic) mode -Wide viewing angle -High speed response -SXGA(1280 x 1024 pixels) resolution -Low power consumption -2 dual CCFTs(Cold Cathode Fluorescent Tube)
  • Page 15: Parameter Guide Line For Ccfl Inverter

    LM-729 Service Manual Rev: A 4.4.4 Parameter guide line for CCFL Inverter INVERTER MAX BRINGTHNESS (Vadj:5.0v), LOAD=120K X4(ROOM TEMPERATURE 25   4 )  ITEM  SYMBOL  MIN.  TYP.  MAX.  UNIT  REMARK  Input voltage  Vin    10.8  12  13.2    V    Input current  Iin    2250  2500  mA  FOR 4 LOAD ...
  • Page 16: Block Diagram

    LM-729 Service Manual Rev: A 5. Block Diagram 5.1 Monitor Exploded View...
  • Page 17: Software Flow Chart

    LM-729 Service Manual Rev: A 5.2 Software Flow Chart...
  • Page 18 LM-729 Service Manual Rev: A Remark: 1) MCU initialize. 2) Is the EEprom blank ? 3) Program the EEprom by default values. 4) Get the PWM value of brightness from EEprom. 5) Is the power key pressed ? 6) Clear all global flags.
  • Page 19: Electrical Block Diagram

    LM-729 Service Manual Rev: A 5.3 Electrical Block Diagram 5.3.1 Main Board Interface (CN4/CN5) Scalar gm5126/gm2126 (Include MCU,ADC,OSD) Flash Memory W39f010P-70B (U6) (U4) Hsync, EPR_SDA Vsync EPR_SCL DVI-I only Control EEPROM D-Sub Connector Interface 24C16 Connector (CN1) (CN9) (U7) (CN2)
  • Page 20: Inverter/Power Board

    LM-729 Service Manual Rev: A 5.3.2 Inverter/Power Board Inverter Block Diagram P a ra lle t-re s o n a n t V in B u c k C o n n e c to r in v e rte r...
  • Page 21 LM-729 Service Manual Rev: A Power Block Diagram PWPC7425A3...
  • Page 22: Schematic

    LM-729 Service Manual Rev: A 6. Schematic 6.1 Main Board 0.1uF/16V Connect two grounds at one single point only. BAV99 BAV99 AGND RX2-IN A_GND RX2- RX2+IN RX2+ SGND DDC_SCL_D1 1/16W DDCCLK 1/16W DDC_SDA_D1 DDCDAT A_VSYNC 0.1uF/16V RX1-IN RX1+IN SGND DVI_5V 1/16W MLL5232B 5.6V...
  • Page 23 LM-729 Service Manual Rev: A +3V3 +3V3 +3V3 3V3_DDDS +2V5 FB18 600 OHM 600 OHM 600 OHM 22uF/16V 0.1uF/16V 0.1uF/16V 3V3_SDDS FB19 +3V3 600 OHM Close to respective power Pins Close to respective power Pins 600 OHM 22uF/16V 0.1uF/16V GM5126...
  • Page 24 LM-729 Service Manual Rev: A +P5V CONNECTOR for PANEL +12V 100uF/16V 1/16W 1/16W R200 +P3V3 100K 1/16W R74 NC C200 R201 22uF/16V 100uF/16V R202 NC 510K 1/16W CTRLP12V +12V OD00N OD00N OD00P OD00P R203 PPWR TCON_ROE OD01N PMBS3904 TCON_ROE OD01N...
  • Page 25 LM-729 Service Manual Rev: A +3V3 CN601 6P PLUG R/A VOUT R116 AIC1084-33CE 1/16W R232 C125 C124 C126 D20 LL4148 10K 1/16W Standby 100uF/16V 0.1uF/16V STDBY 0.1uF/16V VOLUME FB15 C231 600 OHM 1uF/16V R231 R118 1/16W 1.5K 1/16W FB16 600 OHM...
  • Page 26: Audio Board

    LM-729 Service Manual Rev: A 6.2 AUDIO Board OUT_L OUT_R FB200 +12V CN202 WAFER 2*7P 2.54mm MUTE BEAD C215 C201 C202 C203 470uF/16V 470uF/16V 0.1uF 1000 pF C214 VOLUME 1000 pF U201 TDA7496L! CN204 C205 CN203 C204 0.47uF R201 10K...
  • Page 27: Key Board

    LM-729 Service Manual Rev: A 6.3 Key Board LED_ORANGE 74LCX14 LED_GRN 74LCX14 SOT-23 1/16W 1/16W +3V3 LED_GRN LED_ORG KEY_AUTO KEY_MENU KEY_LEFT 1/16W KEY_RIGHT 1/16W KEY_ONOFF WAFER 8P2.0 DUAL R/A KEY_LEFT GPIO6 KEY_AUTO GPIO8 KEY_MENU GPIO3 KEY_RIGHT GPIO7 4.7K 1/16W KEY_ONOFF GPIO2 R95 4.7K...
  • Page 28: Inverter/Power Board

    LM-729 Service Manual Rev: A 6.4 Inverter/Power Board R920 C920 47 1/2W 0.001uF/500V T901 F902 FB903 L903 0 1/16W 0 1/16W CON102 DB901 R906 D910 2KBP06M 1M 1/4W R904 C906 R903 C922 C924 C928 1M 1/4W 0.0015uF/2KV 100K 2W 1000uF/16V 470uF/16V 0.1uF...
  • Page 29 D210 1N4148 MPS3906 R203 D206 1N4148 R211 R241 D208 R235 1N4148 910 1/4W R239 AOC (Top Victory) Electronics Co., Ltd. C222 C220 R237 0.47uF/63V 1uF/25V is power GND Title Size Document Number is signal GND Date: Friday, July 25, 2003...
  • Page 31: Pcb Layout

    LM-729 Service Manual Rev: A 7. PCB Layout 7.1 Main Board...
  • Page 32 LM-729 Service Manual Rev: A...
  • Page 33: Inverter/Power Board

    LM-729 Service Manual Rev: A 7.2 Inverter/Power Board...
  • Page 34: Keypad Board And Audio Board

    LM-729 Service Manual Rev: A 7.3 Keypad Board and Audio board 1. Keypad Board...
  • Page 35 LM-729 Service Manual Rev: A 2.Audio Board...
  • Page 36: Maintainability

    LM-729 Service Manual Rev: A 8. Maintainability 8.1 Equipments and Tools Requirement 1.) Voltmeter. 2.) Oscilloscope. 1.) Pattern Generator. 2.) DDC Tool with a IBM Compatible Computer. 3.) Alignment Tool. 4.) LCD Color Analyzer. 5.) Service Manual. 6.) User Manual.
  • Page 37: Trouble Shooting

    LM-729 Service Manual Rev: A 8.2 Trouble Shooting 8.2.1 Main Board 1.NO SCREEN APPEAR Measured CN11 pin5 = 12 V? Check Correspondent component. Measured CN11 pin 9/10= 5V? Is there any shortage or cold solder? Measured U8 pin 2= 3.3V? Measured U9 pin 2= 2.5V?
  • Page 38 LM-729 Service Manual Rev: A 2.PANEL-POWER CIRCUIT Check the PPWR panel power relative circuit, check R203 should have response from 0V to 5V Q5, Q2(pin7,8) When we switch the power switch from on to off In normal operation, when LED =green, R203...
  • Page 39 LM-729 Service Manual Rev: A 4.U4-DATA OUTPUT NG , no transition Measured DCLK(pin 15 or pin 16 from U4) DVS, DHS (pin 1,4 from U4 ) Is the waveform ok? DCLK around 48 MHZ , DVS=60.09Hz , DHS around 80 KHz ?(refer to input...
  • Page 40: Power/Inverter Board

    LM-729 Service Manual Rev: A 8.2.2 Power/Inverter Board 1.) No power     Repeating the start voltage...
  • Page 41 LM-729 Service Manual Rev: A 2.) W / LED , No Backlight Check Q209/Q210/C213 or Q211/Q212/C214...
  • Page 42: Keypad Board

    LM-729 Service Manual Rev: A 8.2.3 KeyPad Board OSD is unstable or not working Connect KeyPad Board Is KeyPad Board connecting normally ? Replace Button Switch Is Button Switch normally ? Replace KeyPad Board Is KeyPad Board Normally ? Check Main Board...
  • Page 43: White-Balance, Luminance Adjustment

    LM-729 Service Manual Rev: A 9. White-Balance, Luminance adjustment Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment. Before started adjust white balance ,please setting the Chroma-7120 MEM. channel 1 to 6500 color, MEM. channel 2 to...
  • Page 44: Edit Content

    LM-729 Service Manual Rev: A 10. EDIT Content A. D-SUB Connector (Analog) Note: Byte 0C, 0D, 0E, 0F means Serial No. Byte 10, 11 means Manufacture Time. Byte 7F means checksum B. DVI Connector (Digital) Note: Byte 0C, 0D, 0E, 0F means Serial No. Byte 10, 11 means Manufacture Time. Byte 7F means checksum...
  • Page 45: Bom List

    LM-729 Service Manual Rev: A 11. BOM List...
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