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‚ ñ SN[¶ u 5~ ô O î • D e™ N u(
QQ:505966338
AOC LM2028
SERVICE MANUAL
AOC LM2028
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 OFTHIS INFORMATION AFTER THE DATE OF
PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
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Summary of Contents for AOC LM2028
- Page 1 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 SERVICE MANUAL AOC LM2028 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 OFTHIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
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Page 2: Table Of Contents
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 Table of Contents 1. MONITOR SPECIFICATIONS ............................4 2. LCD MONITOR DESCRIPTION ............................4 3. OPERATING INSTRUCTIONS ............................5 3.1 GENERAL INSTRUCTIONS ............................5 3.2 ADJUSTING THE PICTURE ............................5 4. - Page 3 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 Revision List Version Release Date Revision History TPV Model Jun-29-2005 Initial Release TA92KAUHBAAON Nov-07-2006 Add TPV Model in item 11 TA92KAUDBAA1NP Page 3 of 66...
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Page 4: Monitor Specifications
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 1. MONITOR SPECIFICATIONS 510 mm (20.1”) a-si TFT Active matrix LCD panel, 0.255 mm dot pitch. Microprocessor controlled scan technology 19 factory modes, 19 new modes... -
Page 5: Operating Instructions
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 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. - Page 6 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 user mode. User / Blue Blue Gain from Digital-register. 0-100 Auto Adjust the H/V Position, Focus and Clock of picture. Auto Config Do not execute Auto Config, return to main menu.
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Page 7: Input/Output Specfication
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 4. INPUT/OUTPUT SPECFICATION 4.1 INPUT SIGNAL CONNECTOR PIN NO. DESCRIPTION PI N NO. DESCRIPTION Green Logic Ground Blue Monitor Ground Monitor Ground DDC-Serial Data... -
Page 8: Factory Preset Display Modes
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 4.2 FACTORY PRESET DISPLAY MODES： VESA MODES Horizontal Vertical Nominal Nominal Nominal Sync Sync Pixel Mode Resolution Total Frequency Freq. Polarity Polarity Clock +/- 0.5kHz... -
Page 9: Panel Specification
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 4.3 PANEL SPECIFICATION 4.3.1 PANEL FEATURE － 20.1 inch Color TFT-LCD － ALL input signals are 2 Channel LVDS interface compatible － Supports the SXGA(H1600Pixel × V1200Lines) resolution －... -
Page 10: Optical Characteristics
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 4.3.3 OPTICAL CHARACTERISTICS The optical characteristics are measured under stable conditions at 25℃ (Room Temperature)： 4.3.4 PARAMETER GUIDE LINE FOR CFL INVERTER. Page 10 of 66... -
Page 11: Block Diagram
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 5. BLOCK DIAGRAM 5.1 SOFTWARE FLOW CHART Page 11 of 66... - Page 12 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 1). MCU initialize. 2). Is the eeprom blank? 3). Program the eeprom by default values. 4). Get the PWM value of brightness from eeprom.
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Page 13: Electrical Block Diagram
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 5.2 ELECTRICAL BLOCK DIAGRAM 5.2.1 SCALAR BOARD BLOCK DIAGRAM LCD Interface Scalar MST9251 W78E65P-40 (Include ADC, OSD) (U402) (U403) EEPROM Crystal (Y1) AT24C16AN-10SI-2.7 14.318MHz... -
Page 14: Inverter/Power Board Block Diagram
‚ ñ S N[ ¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 5.3.2 INVERTER/POWER BOARD BLOCK DIAGRAM Inverter Block Diagram Page 14 of 66... - Page 15 ‚ ñ S N[ ¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 Power Block Diagram Page 15 of 66...
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Page 16: Schematic
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 6.SCHEMATIC 6.1 MAIN BOARD 03. Graphics/Components In 05. MST6251 04. Frame Memory RXC+ RXC+ FSBKSEL0 FSBKSEL0 RXC- RXC- FSBKSEL1 FSBKSEL1 RX2+ RX2+ FSCLK- FSCLK-... - Page 17 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 C1 0.1uF/16V C2 0.1uF/16V C3 0.1uF/16V 0.1uF/16V DVI CONNECTOR BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 RX2-IN 1/16W RX2- RX2- RX2+IN 1/16W ...
- Page 18 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 +2.5V_DMQ +2.5V_DMC 22uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 22uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V +2.5V_DMQ...
- Page 19 LVDS Pane l conne ctor +3.3DV1 AVDD_PLL Inte rface s dire ctly to SXGA AVDD_PLL and UXGA LVDS Pane ls AVDDPLL2 VDD_MPLL +APLL For AOC LCD I/F- CONNECTOR for PANEL VDD_MPLL +3.3DV1 AVDDPLL2 7 +3.3DV2 F/W default set Odd/Even Swap. +APLL AVDD_DVI +3.3DV2...
- Page 20 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 For Bank Select 920629:EDID Addition Ke yPad conne ctor 600 OHM Syntek 128kB Protection ら稸BL106-10-Key Pad For AOC Issue VMCU VMCU 600 OHM VMCU R307 4.7K...
- Page 21 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 Le ave 1sq inch- e xpose d copper are a attache d to Tab of U802 +12V CN901 is supply input and signal output Connector.
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Page 22: Power Board
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 6.2 POWER BOARD R919 47_1/2W_M R920 C913 47_1/2W_M 102P_500V +12V D910 F902 MOSPEC20100 0 /4A/1206 PQ26/22.5 L903 V12A 80LL17T-5 73L-253-150L C917 0.1UF/0805/X7R FB902... - Page 23 1N4148 CHOKE R211 12K L206 BU_R R241 D208 R235 51K 1N4148 1.5K 1/10W CHOKE AOC (Top Victory) Electronics Co., Ltd. C222 R239 C220 R237 0.47uF/63V 12K 1uF/25V 680 Title PWPC2062AUE1 Size Document Number Custom Friday , September 10, 2004...
- Page 24 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 CN303 MUTE/MODE MUTE PHONE_RIGHT PHONE_RIGHT PHONE_LEFT PHONE_LEFT CN304 CONN +12V MUTE/MODE VOLUME LOUT+ ROUT+ C130 LOUT- ROUT- C127 470uF/16V 0.1uF/16V WAFER 2*7P 2.54mm R101...
- Page 25 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 +12V BRIGHT R403 R410 ON/OFF R407 R411 R412 NC R401 R402 100 OHM R404 R405 120K R413 0 OHM R414 Q401 0 OHM IC401A...
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Page 26: Pcb Layout
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 7. PCB LAYOUT 7.1 MAIN BOARD 7.2 KEYPAD BOARD Page 26 of 66... -
Page 27: Power Board
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 7.3 POWER BOARD Page 27 of 66... -
Page 28: Maintainability
‚ ñ S N[ ¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 8. MAINTAINABILITY 8.1 EQUIREMENT AND TOOLS REQUIREMENT 1、Voltmeter. 2.、Oscilloscope. 3、Pattern Generator. 4、DDC Tool with a IBM Compatible Computer. 5、Alignment Tool 6、LCD Color Analyzer. -
Page 29: Trouble Shooting
‚ ñ S N[ ¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 8.2 TROUBLE SHOOTING 8.2.1 Main board Defect Mode Failure Analysis Repair Testing Missing Line Abnormal Display Bright Dot Dark Dot Light Leakage... - Page 30 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 Noise Check Single Cable Change Single Cable Flicker Check Main board Change Main board Change Panel Check Panel Abnormal Check Main board Change Main board...
- Page 31 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 LED Display Change Keyboard or LED Off Abnormal Main board or wire Change Keyboard or LED Dark Main board Change Keyboard or LED Abnormal...
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Page 32: Keypad Board
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 INVERTER CONTROL RELATIVE CIRCUIT Measured the inverter connector CN12 Check the Bklt-On relative circuit, R103, R100, R101, Pin6 on/off control=5V (on) In normal operation, when LED =green, R101 Bklt-On... -
Page 33: Power/Inverter Board
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 8.2.3 POWER/INVERTER BOARD 1) No power Check CN12 pin2, 4 = 12V Check AC line volt 110V or 220V Check AC input Check the voltage of C905 (+) - Page 34 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 2) No Backlight Check C225 (+) =12V Check Main board Check ON/OFF signal Check main board Check U201 pin9=12V Change Q201 or Q202 Check the pin1 of U201 have sawtooth wave...
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Page 35: White- Balance, Luminance Adjustment
6500 color temp. parameter is x = 313±10, y = 329 ±10, Y = 200 ±10 cd/m 3、Enter Into the factory preset mode of LM2028 Firstly, turn off the power and remove the power plug, then press the menu key and plug in at the same time, finally, press the menu again will activate the factory mode, the factory OSD will be at the left top of the screen. -
Page 36: Edid Content
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 10. EDID CONTENT Page 36 of 66... -
Page 37: Bom List
‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 11 BOM LIST TA92KAUHBAAON Location Part NO. for TPV Description Quan. Unit CBPCA92KAUAO MAIN BOARD FOR 20" LCD PWPC2062AUE1 POWER BOARD 12G 412 1 FOOT_HEAD (T1.2mm) - Page 38 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 TC12 67G309V100 3 10uf =_20% 16v TC13 67G309V220 3 22UF +-20% 16V TC14 67G309V220 3 22UF +-20% 16V TC15 67G309V100 3 10uf =_20% 16v...
- Page 39 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 65G0603104 12 CER2 0603 X7R 16V 100N 65G0603104 12 CER2 0603 X7R 16V 100N 65G0603104 12 CER2 0603 X7R 16V 100N 65G0603104 12 CER2 0603 X7R 16V 100N...
- Page 40 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 65G0603104 12 CER2 0603 X7R 16V 100N 65G0603104 12 CER2 0603 X7R 16V 100N 65G0603104 12 CER2 0603 X7R 16V 100N 65G0603104 12 CER2 0603 X7R 16V 100N...
- Page 41 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 65G0603104 12 CER2 0603 X7R 16V 100N 65G0603104 12 CER2 0603 X7R 16V 100N 65G0603104 12 CER2 0603 X7R 16V 100N 93G 6433P BAV99...
- Page 42 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 R101 61L0603513 CHIP 51K OHM 1/10W R102 61L1206000 RST SM 1206 JUMP MAX 0R R103 61L0603472 RST SM 0603 RC0603 4K7 R105 61L0603102 RST SM 0603 RC0603 1K P...
- Page 43 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 61L0603750 9F 75OHM 1% 1/10W 61L0603560 CHIPR 56 OHM +-5% 1/10W 61L0603472 RST SM 0603 RC0603 4K7 61L0603101 RST SM 0603 RC0603 100R 61L0603560...
- Page 44 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 61L0603101 RST SM 0603 RC0603 100R 61L0603472 RST SM 0603 RC0603 4K7 61L0603100 CHIP 10 OHM 1/10W 61L0603471 CHIPR 470 OHM+-5% 1/10W 61L0603103 RST SM 0603 RC0603 10K...
- Page 45 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 PWC2062AUE1SMT POWER BOARD ASS'Y FOR S 40G 45762412B CBPC LABEL 1.05 705L 20 57 12 Q901 ASS'Y 705L 20 93 02 D910 D911 ASS'Y...
- Page 46 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 L202 73G 253138 L CHOKE BY LI TAI L203 73G 174 39YSA FILTER L204 73G 174 39YSA FILTER L205 73G 174 39YSA FILTER L206...
- Page 47 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 C225 65G0805105 27 CHIP 1UF Y5V 0805 C228 65G0805102 31 1000PF 50V NPO C229 65G0805102 31 1000PF 50V NPO C230 65G0805104 32 CHIP 0.1U 50V X7R...
- Page 48 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 Q207 57G 417 6 PMBS3906/PHILIPS-SMT(06 Q208 57G 417 6 PMBS3906/PHILIPS-SMT(06 Q902 57G 417 4 PMBS3904/PHILIPS-SMT(04 Q903 57G 417 6 PMBS3906/PHILIPS-SMT(06 R106 61L0603333 CHIP 33K OHM 1/10W...
- Page 49 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 R241 61L0603513 CHIP 51K OHM 1/10W R243 61L0603102 RST SM 0603 RC0603 1K P R244 61L0603102 RST SM 0603 RC0603 1K P R901 61L1206684...
- Page 50 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 CN901 6V 31500 EYELET FB101 71G 55 29 FERRITE BEAD IC903 56V 158 10 T AZ431AZ-A TO-92 L901 6G 31502 1.5MM RIVET L902 6V 31502 1.5MM RIVET...
- Page 51 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 34G1393 GM B BASE COVER 34G1465AAS B BEZEL 37G 514 2 HINGE M1G 140 10120 SCREW Q1G 330 6120 SCREW Q1G 330 6120 SCREW...
- Page 52 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 TA92KAUDBAA1NP Location Part NO Description 007G 5 7106 COMPOUND PALLET 007G 5 7107 COMPOUND PALLET 012G 412 1 FOOT_HEAD(T1.2mm) 015G8120 1 MAIN FRAME 026G 800504 7...
- Page 53 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 034G1392 GM T 19 HINGE COVER 034G1465AAS T BEZEL(20") 037G 514 2 HINGE 052G 1211512 GP ALUMINUM TAPE 0M1G 140 10125 SCREW M4X10 0Q1G 330 6120...
- Page 54 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 056G 585 7A AZ1117D-2.5-E1 056G 585 7A AZ1117D-2.5-E1 U401 056G 615 9 EM6A9320BI-5MG FBGA-144 056G 643 5A MAX810 STRG U402 056G1125137 X W78E065A40PL PLCC44...
- Page 55 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 061G0603101 RST CHIPR 100 OHM +-5% 1/10W 061G0603101 RST CHIPR 100 OHM +-5% 1/10W 061G0603101 RST CHIPR 100 OHM +-5% 1/10W 061G0603101 RST CHIPR 100 OHM +-5% 1/10W...
- Page 56 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 061G0603330 RST CHIPR 33 OHM +-5% 1/10W 061G0603471 RST CHIPR 470 OHM +-5% 1/10W 061G0603471 RST CHIPR 470 OHM +-5% 1/10W R277 061G0603471 RST CHIPR 470 OHM +-5% 1/10W...
- Page 57 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 065G0603103 32 0.01UF +-10% 50V X7R 065G0603103 32 0.01UF +-10% 50V X7R 065G0603103 32 0.01UF +-10% 50V X7R 065G0603103 32 0.01UF +-10% 50V X7R 065G0603103 32 0.01UF +-10% 50V X7R...
- Page 58 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 065G0603104 12 CER2 0603 X7R 16V 100N P 065G0603104 12 CER2 0603 X7R 16V 100N P 065G0603104 12 CER2 0603 X7R 16V 100N P...
- Page 59 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 065G0603104 12 CER2 0603 X7R 16V 100N P 065G0603104 12 CER2 0603 X7R 16V 100N P 065G0603104 12 CER2 0603 X7R 16V 100N P...
- Page 60 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 ZD10 093G 39149 MLL5232B BY FULL POWER SMT 093G 64 42 PP BAV70 SOT-23 093G 64 42 PP BAV70 SOT-23 ZD25 093G 6432V LL4148-GSO8...
- Page 61 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 C952 065G305M1022EM Y2 1000PF +-20% 250VAC C951 065G305M1022EM Y2 1000PF +-20% 250VAC C912 065G306M4722BP 4700PF +-20% 400VAC C915 067G215C1024KV EC 105℃ CAP 1000UF M 25V...
- Page 62 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 705L 980 57 01 CN901 ASS'Y CN901 087G 501 19 RF AC SOCKET 095G205S354052 HARNESS 096G 29 6 H.S. TUBE 705L 980 61 01...
- Page 63 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 R220 061G0603203 RST CHIPR 20 KOHM +-5% 1/10W R221 061G0603203 RST CHIPR 20 KOHM +-5% 1/10W R222 061G0603203 RST CHIPR 20 KOHM +-5% 1/10W...
- Page 64 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 R908 061G1206339 3.3 1206 R929 061G1206434 RST CHIPR 430 KOHM +-5% 1/4W R906 061G1206434 RST CHIPR 430 KOHM +-5% 1/4W R920 061G1206470 47 1206...
- Page 65 ‚ ñ SN[¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 C208 065G0805331 31 CHIP 330pF 50V NPO C222 065G0805474 22 CHIP 0.47UF 25V X7R 0805 C221 065G0805474 22 CHIP 0.47UF 25V X7R 0805 C913...
- Page 66 ‚ ñ S N[ ¶ u 5~ ô O î • D e™ N u( QQ:505966338 AOC LM2028 C906 065G 1K152 1T6052 1.5nF /1K Y5P+-10% C207 067G 305330 7T 33UF 105 度 C907 067G 3054797KT 4.7UF 50V C108 067G215B4713KT LOW ESR 470UF16V BY HERMEI...