AOC LM-522 Service Manual
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AOC LM-522 Service Manual

15"
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LM-522 Service Manual

SERVICE MANUAL

15" LCD Monitor
LM-522
T
HESE 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 RELIABILITY FOR CHANGES,
ERRORS OR OMISSIONS.
1

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  • Page 1: Service Manual

    LM-522 Service Manual SERVICE MANUAL 15” LCD Monitor LM-522 HESE 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 RELIABILITY FOR CHANGES,...

  • Page 2: Table Of Contents

    LM-522 Service Manual CONTENT TABLE 1.MONITOR SPECIFICATIONS ...................... 4 2. LCD MONITOR DESCRIPTION ....................4 3. OPERATING INSTRUCTIONS ....................5 3.1 GENERAL INSTRUCTIONS....................5 3.2 CONTROL BUTTONS ......................5 3.3 ADJUSTING THE PICTURE....................5 4. INPUT/ OUTPUT SPECIFICATION ..................... 7 4.1 I...
  • Page 3 LM-522 Service Manual 10. EDIT CONTENT........................31 11.BOM LIST ..........................32...

  • Page 4: Monitor Specifications

    LM-522 Service Manual 1.MONITOR SPECIFICATIONS • 38 cm (15”) a-si TFT Active matrix LCD panel, 0.297mm dot pitch. • Microprocessor controlled scan technology • 16 factory presets , 18 new modes • Vertical refresh rate 55Hz to 75 Hz •...

  • Page 5: Operating Instructions

    LM-522 Service Manual 3. OPERATING INSTRUCTIONS 3.1 GENERAL INSTRUCTIONS Press the power button to turn the monitor on or off. The other control buttons are located in the front of the monitor. By changing these settings, the picture can be adjusted to your personal preferences.
  • Page 6 LM-522 Service Manual The descriptions for function control LEDS Main Menu Main Sub Menu Sub Menu Item Description Item Menu Icon Icon Contrast Contrast from Digital-register Luminance Brightness Backlight Adjustment Adjust Picture Phase to reduce Horizontal-Line Focus noise Image Setup Clock Adjust picture Clock to reduce Vertical-Line noise.

  • Page 7: Input/ Output Specification

    LM-522 Service Manual Do not execute reset, return to main menu. Exit Exit OSD 4. Input/ Output Specification 4.1 Input Signal Connector Red Video +5 v Green Video Logic Ground Blue Video RS-232 RX RS-232 TX DDC-Serial Data DDC-Return H-Sync.

  • Page 8: Power Supply Requirements

    LM-522 Service Manual Nominal Nominal Nominal Sync Sync Pixel Mode Resolution Total Frequency Freq. Polarity Polarity Clock +/- 0.5kHz +/- 1 Hz (MHz) 720x400@70Hz 900 x 449 31.469 70.087 28.322 640x350@70Hz 800 x 449 31.469 70.087 25.175 1024x768@72Hz 1304x798 57.515 72.100...

  • Page 9: Display Characteristics

    LM-522 Service Manual 4.4.2 Display Characteristics 4.4.3 Optical Characteristics...

  • Page 10: Parameter Guideline For Ccfl Inverter

    LM-522 Service Manual 4.4.4 Parameter guideline for CCFL Inverter 4.4.5 Back-light Unite...

  • Page 11: Block Diagram

    LM-522 Service Manual 5. Block Diagram 5.1 Monitor Exploded View...

  • Page 12: Software Flowing Chart

    LM-522 Service Manual 5.2 Software Flowing Chart...
  • Page 13 LM-522 Service Manual MCU initialize Is the EPROM blank? Program the EPROM by default values. Get the PWM value of brightness from EPROM. Is the power key pressed? Clear all global flags. Are the AUTO and SELECT keys pressed? Enter factory mode.

  • Page 14: Electrical Block Diagram

    LM-522 Service Manual 5.3 Electrical Block Diagram 5.3.1 Main Board 5.3.2 Inverter/Power Board Inverter Block Diagram P a r a l l e t - r e s o n a n t V i n B u c k C o n n e c t o r...

  • Page 15: Power Block Diagram

    LM-522 Service Manual Power Block Diagram...

  • Page 16: Schematic

    LM-522 Service Manual 6. Schematic 6.1 Main Board...
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  • Page 21: Power Board

    LM-522 Service Manual 6.2 Power board...
  • Page 22 LM-522 Service Manual...

  • Page 23: Pcb Layout

    LM-522 Service Manual 7. PCB Layout 7.1 Main Board...

  • Page 24: Power Board

    LM-522 Service Manual 7.2Power board...

  • Page 25: Keypad Board

    LM-522 Service Manual 7.3 Keypad Board 7.4 Audio Board...

  • Page 26: Maintainability

    LM-522 Service Manual 8. Maintainability 8.1 Requirements and Tools Requirement Voltmeter. Oscilloscope. Pattern Generator. DDC Tool with an IBM Compatible Computer. Alignment Tool. LCD Color Analyzer. Service Manual. User Manual.

  • Page 27: Trouble Shooting

    LM-522 Service Manual 8.2 Trouble Shooting 8.2.1 Main Board 1. NO SCREEN APPEAR Measured CN105 pin5/pin6 =12 V? Measured CN105 pin9/pin10 =5V? Check Correspondent component. Measured U501 pin 2= 3.3V? Is there any shortage or cold solder? Measured U502 pin2=2.5V?
  • Page 28 LM-522 Service Manual 2. PANEL POWER CIRCUIT Check R162 should have response from 0V to 5V Measured X101 waveform is normal? When we switch the power switch from off to on Replace X101 Check Q102, Q101 is broken or CN109 solder abnormal?

  • Page 29: Key Pad Board

    LM-522 Service Manual 4. U4-DATA OUTPUT Check NT68521A-XFG (U102) Signal output (PIN64-69, Measured X101 waveform is PIN50-55,PIN 41-46) normal? Is the waveform ok? Replace X101 Check HS/VS input signal are Replace U101 normal? Check relative component 8.2.2 Key Pad Board...

  • Page 30: White-Balance, Luminance Adjustment

    LM-522 Service Manual 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 7800 color ( our 6500 parameter is x = 313 ±10, y = 329 ±10, Y = 200 ±10 cd/m 7200 parameter is x = 296 ±10, y =...

  • Page 31: Edit Content

    LM-522 Service Manual 10. EDIT Content...

  • Page 32: Bom List

    LM-522 Service Manual 11.BOM LIST T560KCNHKAACA M1L 330 4128 SCREW M3X4 AUPC560KB9 AUDIO BOARD CBPC560KCNAA CONVERSION BOARD KEPC560KDB KEY BOARD PWPC5215A1E20C POWER BOARD 15G5791 1 VESA BKT 15G5908 2 BRACKET 15G5935 24 MAIN FRAME 33G4693 AI T L703A-C1-KEY(NMV) 33G4694 1 C...
  • Page 33 LM-522 Service Manual 750LLC50P02 CPT 15" XP02 PANEL AM1L1740 10 47 SCREW AUPC560KB9 AUPC560KB4SMT AUDIO BOARD FOR T560K* CN202 33L801714A PIN HEADER 2*7P 2.0mm CN204 95G8014 3503 WIRE HARNESS U201 56L 616 1 TDA7496L BY ST AUPC560KB4AI AUDIO BOARD FOR T560K*...
  • Page 34 LM-522 Service Manual C159 67L305M101 3K 100UF 16V 105C +-20% C160 67L305M101 3K 100UF 16V 105C +-20% C167 67L305V101 7K 100UF 50V C178 67L305V101 3 1000UF +-2 16V C179 67L305V101 3 1000UF +-2 16V CN102 33L8027 16 WAFER 16PIN 2.0mm DIP...
  • Page 35 LM-522 Service Manual C134 65L0603104 32 CHIP 0.1UF 50V X7R C135 65L0603104 32 CHIP 0.1UF 50V X7R C137 65L0603104 32 CHIP 0.1UF 50V X7R C138 65L0603103 32 0.01UF+-10% 50V X7R C139 65L0603103 32 0.01UF+-10% 50V X7R C140 65L0603103 32 0.01UF+-10% 50V X7R...
  • Page 36 LM-522 Service Manual D101 93L 60230 BAT54C(L43) D104 56L 158501 AZ431AN-A SOT23-3 D105 93G 6433P BAV99 D106 93G 6433P BAV99 D107 93G 6433P BAV99 D108 93G 6432V LL4148-GS08 D109 93G 6432V LL4148-GS08 D110 93G 6432V LL4148-GS08 D111 93G 6432V LL4148-GS08...
  • Page 37 LM-522 Service Manual R134 61L0603102 CHIPR 1K OHM +-5% 1/10W R135 61L0603102 CHIPR 1K OHM +-5% 1/10W R136 61L0603101 CHIPR 100 OHM +-5% 1/10 R137 61L0603101 CHIPR 100 OHM +-5% 1/10 R140 61L0603220 CHIPR 22 OHM+-5% 1/10W R141 61L0603220 CHIPR 22 OHM+-5% 1/10W...
  • Page 38 LM-522 Service Manual R201 61L0603752 CHIPR 7.5K 1/10W R202 61L0603101 CHIPR 100 OHM +-5% 1/10 R203 61L0603101 CHIPR 100 OHM +-5% 1/10 R204 61L0603101 CHIPR 100 OHM +-5% 1/10 R205 61L0603101 CHIPR 100 OHM +-5% 1/10 R206 61L0603103 CHIPR 10K OHM +-5% 1/10...
  • Page 39 LM-522 Service Manual C905 67L305S10115K 100UF +-20% 450V C906 65L 2K152 5E6921 1500 PF 10% 2KV Y5P C922 67L215C102 3H EC LESR 1000UF16V HERME C925 67L 215102 3H 1000UF +-20% 16V CN102 95L8021 12512 WIRE HARNESS CN201 33L8020 2D AC CONN.2P R/A DIP BY ACES...
  • Page 40 LM-522 Service Manual C928 65L0603104 37 CHIP 0.1UF 50V/Y5V D201 93G2004 2A SM240A DO-214AC D203 93G 39S 3 T BZT52-C11 Q201 57G 760 5 DTC144WKA BY ROHM SMT Q202 57G 760 4 DTA144WKA BY ROHM SMT Q203 57L 763 3...
  • Page 41 LM-522 Service Manual R929 61L0603000 CHIPR 0OHM +-5% 1/10W R931 61L0603102 CHIPR 1K OHM +-5% 1/10W U201 56L 608 1 TL1451ACD ZD901 93G 39S 23 T GLZ22B ZD904 93L 39S 19 T PTZ7.5B 715L1034 3 PCB VER:C C201 67L215C1514HT LOW ESR 150UF 25V 8*7MM...
  • Page 42 LM-522 Service Manual R918 61L 17210352T CFR 10KOHM +-5% 1/4W R920 61G 20747052T 47 OHM 1/2W R922 61G 20747052T 47 OHM 1/2W R930 61L 17210152T 100 OHM 5% 1/4W T901 6G 31502 1.5MM RIVET 95L205S354022 HARNESS 96L 29 6 SHRINK TUBE UL/CSA...

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