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AOC LM927U   

1 

   

SERVICE MANUAL

 

 

 

19” LCD Monitor 

 

LM927U

 

 

 

 

 

 

 

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 RELIABILITY 

FOR CHANGES, ERRORS OR OMISSIONS.

 

 

http://www.wjel.net

Summary of Contents for LM927U

Page 1: ...EPAIR 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 DISCLA...

Page 2: ...4 Parameter Guide Line For CCFL Inverter 12 5 Block Diagram 13 5 1 Monitor Exploded View 13 5 2 Software Flow Chart 14 5 3 Electrical Block Diagram 16 5 3 1 Main Board 16 5 3 2 Inverter Power Board 17...

Page 3: ...AOC LM927U 3 Revision List Revision Date Change Description A00 Jul 11 05 Original Revision h t t p w w w w j e l n e t...

Page 4: ...requency 55 75Hz Display Color 16 7M colors RGB 8 bit data Dot Clock 135MHz Contrast Ratio 700 1 White Luminance 250cd m2 Max Resolution 1280 x 1024 Plug Play VESA DDC2BTM ON Mode 50W Power Consumptio...

Page 5: ...and DDC The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage HOST Computer AC IN 100V 240V PWPC board Include adapter inverter F...

Page 6: ...ton is used to control the monitor functions Press to switch functions or adjust settings Auto Adjust Key The Auto Adjust Key is used to automatically set the H Position V Position Clock and Phase Pow...

Page 7: ...n Menu Icon Sub Menu Item Sub Menu Icon Description Contrast Contrast from Digital register Luminance Brightness Backlight Adjustment Focus Adjust Picture Phase to reduce Horizontal Line noise Image S...

Page 8: ...nglish Deutsch N A Set OSD display language to German Fran ais N A Set OSD display language to French Espa ol N A Set OSD display language to Spain Italiano N A Set OSD display language to Italian Lan...

Page 9: ...NO DESCRIPTION 1 Red Video 9 No Pin 2 Green Video 10 Logic Ground 3 Blue Video 11 Monitor Ground 4 Monitor Ground 12 DDC Serial Data 5 DDC Return 13 H Sync 6 Red Ground 14 V Sync 7 Green Ground 15 DD...

Page 10: ...56x625 46 875 P 75 000 P 49 500 1024x768 60Hz 1344x806 48 363 N 60 004 N 65 000 1024x768 70Hz 1328x806 56 476 N 70 069 N 75 000 XGA 1024x768 75Hz 1312x800 60 023 P 75 029 P 78 750 1280x1024 60Hz 1688x...

Page 11: ...efect with a maximum of 1 half wave missing per second DC output Voltage 5VDC 5 12VDC 5 CURRENT 1 5Amp 5V 2 Amp 12V 4 4 PANEL SPECIFICATION 4 4 1 Panel Feature This specification applies to the 19 0 i...

Page 12: ...AOC LM927U 12 4 4 3 Optical Characteristics 4 4 4 Parameter guide line for CCFL Inverter h t t p w w w w j e l n e t...

Page 13: ...AME SHIELD 85G651 3 34G1240 REAR COVER HINGE ASSY 37G 478 1 W33G4673 COVER VESA 15G6050 1 HOLDER SPRING BRACKET 33G4650 BASE 34G1245 STAND 34G1243 W33G4649 GM 34G1242 15G5962 1 34G1241 SPK BOX COVER F...

Page 14: ...AOC LM927U 14 5 2 Software Flow Chart 1 2 N Y 5 Y N 10 Y N 12 Y N 7 Y N 6 4 3 8 9 14 11 13 Y N 15 Y N 16 17 19 Y N 18 h t t p w w w w j e l n e t...

Page 15: ...n color Scalar initializes 10 In standby mode 11 Update the lifetime of back light 12 Check the analog port are there any signals coming 13 Does the scalar send out an interrupt request 14 Wake up the...

Page 16: ...3 Electrical Block Diagram 5 3 1 Main Board LCD Interface MST8131A PQFP 128 Include ADC OSD etc MCU OSD Control Interface Keypad D SUB Connector EEPROM 24C02 Crystal 14 318MHZ EEPROM 24C16 h t t p w w...

Page 17: ...AOC LM927U 17 5 3 2 Inverter Power Board h t t p w w w w j e l n e t...

Page 18: ...h t t p w w w w j e l n e t...

Page 19: ...YNC SOG DDC_CLK DDC_DAT ST_DET2 R R G G B B CLK CLK B5 5 PANEL INTERFACE VLCD PB 0 9 PA 0 9 MST8131A SCHEMATIC VCC3 3 VAA1 TOP A MST8131A for AOC B 1 6 Friday March 26 2004 Title Size Document Number...

Page 20: ...4 VCC3 3 VAA4 4 C202 220uF 25V C205 0 1uF VCC5V ON_OFF D201SCHOTTEYDIODE VAA2 4 C201 0 1uF VCC12V VAA3 GND AdjBACKLITE 4 POWER A MST8131A for AOC B 2 6 Friday March 26 2004 Title Size Document Number...

Page 21: ...03 NC FB301 0 1 16W PC5V R318 10K 1 16W R301 100 1 16W C304 0 047uF HSYNC 4 R313 2 2K 1 16W FB303 0 1 16W VCC5V R311 1K 1 16W R325 75 1 16W R308 10K 1 16W FB304 150 OHM DAT_DDC SOG 4 R327 75 1 16W R31...

Page 22: ...KM NC LVB2P NC LVB2M NC LVB1P NC LVB1M NC LVB0P NC LVB0M DDC1_CLK GPO8 DDC1_DAT GPO7 DDCROM_CLK GPO6 DDCROM_DAT GPO5 AVDD_PLL AVDD AVSS AVSS_DVI LVACKP LVA3M LVA3P AVSS PB5 VAA4 2 B 3 PB6 C414 10uF 16...

Page 23: ...Number Rev Date Sheet of LVB2P PA 0 9 4 LVA0P PB6 LVA1M LVBCKP LVA3P LVA1M PA1 RXE1 RXE2 LVB3P RXO0 LVACKM LVB2P PB 0 9 4 CN503 CON24A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 P...

Page 24: ...OHM C609 NC DDC_DAT 3 4 LED_O SCL 4 DVI DSUB SELECT LED_O LED_B OUT R U601 8051 PLCC 35 21 20 10 14 15 16 17 2 3 4 5 6 7 8 9 43 42 41 40 39 38 37 36 24 25 26 27 28 29 30 31 19 18 32 33 13 11 22 44 12...

Page 25: ...AOC LM927U 25 6 2 Power Board 715L1142 3AUE h t t p w w w w j e l n e t...

Page 26: ...AOC LM927U 26 h t t p w w w w j e l n e t...

Page 27: ...AOC LM927U 27 h t t p w w w w j e l n e t...

Page 28: ...sday October 28 2003 Title Size Document Number Rev Date Sheet of GND R125 0K RIN R123 NC 0K C102 0 1uF 100nf C125 0 1uF 1nf C133 220uF 16V C116 10uF GND VCC CN102 WAFER 4P2 0 R A 1 2 3 4 CN101 PIN 5...

Page 29: ...AOC LM927U 29 7 PCB Layout 7 1 Main Board 715L1150 B h t t p w w w w j e l n e t...

Page 30: ...AOC LM927U 30 7 2 Power Board 715L1142 3 AUE h t t p w w w w j e l n e t...

Page 31: ...AOC LM927U 31 7 3 Audio Board 715L1178 1 7 4 Key Board 715L1170 1 7 5 USB Board 715L1157 1 7 6 CNPC Board 715L1131 1 17 h t t p w w w w j e l n e t...

Page 32: ...ity 8 1 Equipments and Tools Requirement 1 Voltmeter 2 Oscilloscope 3 Pattern Generator 4 DDC Tool with an IBM Compatible Computer 5 Alignment Tool 6 LCD Color Analyzer 7 Service Manual 8 User Manual...

Page 33: ...Please reinsert and make sure the AC of 100 240 is normal Measure U201 PIN2 2 5V U202 PIN2 3 3V Reinsert or check the power section Check Correspondent component Replace U401 Replace U601 Replace X401...

Page 34: ...Replace U601 Check Correspondent component Measure U201 PIN2 2 5V U202 PIN2 3 3V Check Correspondent component Replace U401 X401 oscillate waveform is normal Check Correspondent component OK OK OK OK...

Page 35: ...sure U201 PIN2 2 5V U202 PIN2 3 3V X401 oscillate waveform is normal Check Q203 is broken or CN503 solder Check Correspondent component Replace PANEL Check Correspondent component Replace U401 OK OK O...

Page 36: ...in2 4 12V Check the voltage of C905 Check start voltage for the pin3 of IC901 Check R906 R907 and Change IC901 NG Check the auxiliary voltage is bigger than 10V and smaller than 20V NG NG NG Check Q90...

Page 37: ...ge Q201 or Q202 Check the pin1 of U201 have sawtooth wave Change U201 Check the resonant wave of pin2 pin5 for PT201 PT202 Check the output of PT201 PT202 Check Q209 Q210 C213 Check Q211 Q212 C214 Che...

Page 38: ...s unstable or not working Is Key Pad Board connecting normally Connect Key Pad Board Is Button Switch normally Replace Button Switch Y N N Is Key Pad Board normally Replace Key Pad Board Y N Y Check M...

Page 39: ...the chroma 7120 to RGB mode with press MODE button 2 Switch the MEM channel to Channel9 with up or down arrow on chroma 7120 3 The LCD indicator on chroma 7120 will show x 313 28 y 329 28 Y 200 10 cd...

Page 40: ...6A C6 A1 59 4B 99 23 32 17 4F 59 BF EF 00 81 80 01 01 01 01 01 01 01 01 48 01 01 01 01 01 01 30 2A 00 98 51 00 2A 40 30 70 64 13 00 78 2D 11 00 00 1E 00 00 00 FF 00 31 32 33 80 34 35 36 37 38 39 30 3...

Page 41: ...PCS 34G1239BGN B BEZEL 1 PCS 34G1240 GM 2B REAR COVER 1 PCS 40G 191615 9B ID LABEL 1 PCS 40G 459786 5A CANTION LABEL FOR AL172 1 PCS 40G 58162435A LABEL 1 PCS 41G780061553A TCO 03 CARD 1 PCS 41G78006...

Page 42: ...T AUDIO BOARD FOR SMT 1 PCS C129 67G215B4713KT LOW ESR 470UF16V BY HER 1 PCS C130 67G215B4713KV LOWESR 470UF 16V 1 PCS CN101 33G800914K H 2 7PIN JUAL ROW RIGHT A 1 PCS CN102 95G8014 4 9 HARNESS 1 PCS...

Page 43: ...0603102 32 1000PF 10 50V X7R 1 PCS L101 71G 59B121 TB160808B 1 PCS L102 71G 59B121 TB160808B 1 PCS L103 71G 57G601 TI3216JIG 1 PCS L104 71G 57G601 TI3216JIG 1 PCS L107 71G 57G601 TI3216JIG 1 PCS L108...

Page 44: ...IP 0 1UF 50V X7R 1 PCS C304 65G0603473 32 CHIP 0 047UF 50V X7R 1 PCS C305 65G0603473 32 CHIP 0 047UF 50V X7R 1 PCS C306 65G0603473 32 CHIP 0 047UF 50V X7R 1 PCS C307 65G0603102 32 1000PF 10 50V X7R 1...

Page 45: ...1 PCS C428 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C509 67G 312220 3 SMD 22UF 20 16V 1 PCS C510 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C511 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C601 65G0603104 32 CHI...

Page 46: ...PCS FB405 71G 56Z601 CHIP BEAD 600 OHM 0805 1 PCS FB406 71G 56Z601 CHIP BEAD 600 OHM 0805 1 PCS FB601 71G 56Z601 CHIP BEAD 600 OHM 0805 1 PCS FB602 71G 56Z601 CHIP BEAD 600 OHM 0805 1 PCS FB603 71G 5...

Page 47: ...61L0603101 RST SM 0603 RC0603 100R 1 PCS R316 61L0603101 RST SM 0603 RC0603 100R 1 PCS R317 61L0603103 RST SM 0603 RC0603 10K 1 PCS R318 61L0603103 RST SM 0603 RC0603 10K 1 PCS R325 61L0603750 RST SM...

Page 48: ...0R 1 PCS R634 61L0603101 RST SM 0603 RC0603 100R 1 PCS R635 61L0603101 RST SM 0603 RC0603 100R 1 PCS RN601 61L 125103 8 CHIP AR 8P4R 10KOHM 5 1 PCS RN602 61L 125103 8 CHIP AR 8P4R 10KOHM 5 1 PCS U201...

Page 49: ...6ET 22PF 5 3KV TDK 1 PCS C216 65L 3J2206ET 22PF 5 3KV TDK 1 PCS C217 65L 3J2206ET 22PF 5 3KV TDK 1 PCS C218 65L 3J2206ET 22PF 5 3KV TDK 1 PCS C902 65G305M1022EM Y2 1000PF 20 250VAC 1 PCS C903 63G107K4...

Page 50: ...61G 208102 64 1KOHM 5 1W 1 PCS R230 61G 208102 64 1KOHM 5 1W 1 PCS T901 80LL19T 3 TG TRANSFORMER 1 PCS 96G 29 10 H S TUBE 14 MM C901 65G305M3322B2 3300PF 250VAC 400VAC 1 PCS PWPC1942AUE2AI POWER BOAR...

Page 51: ...08 1 PCS F902 61L1206000 4 0 OHM 4A 1 4W 1 PCS IC101 56G 379 37 FP5001DR 1 PCS IC901 56G 379 33 SG6841SZ 1 PCS L302 71G 56Z601 CHIP BEAD 600 OHM 0805 1 PCS L308 71G 59B601 EA CHIP BEAD 600 OHM 1 PCS L...

Page 52: ...2 RST SM 0603 RC0603 1K P 1 PCS R901 61L1206105 CHIP 1MOHM 5 1 4W 1 PCS R902 61L1206105 CHIP 1MOHM 5 1 4W 1 PCS R904 61L1206105 CHIP 1MOHM 5 1 4W 1 PCS R905 61L1206105 CHIP 1MOHM 5 1 4W 1 PCS R906 61L...

Page 53: ...KT 220UF 16V 1 PCS C905 6G 31502 1 5MM RIVET 2 PCS C916 67G215B4713KT LOW ESR 470UF16V BY HER 1 PCS CN901 6G 31500 EYELET 2 PCS D205 93G 64 1152T 1N4148 1 PCS D206 93G 64 1152T 1N4148 1 PCS D207 93G 6...

Page 54: ...1 4W 1 PCS R236 61G 60268152T 680 OHM 5 1 6W 1 PCS R237 61G 60268152T 680 OHM 5 1 6W 1 PCS R238 61G 60212352T 12KOHM 5 1 6W 1 PCS R239 61G 60212352T 12KOHM 5 1 6W 1 PCS R240 61G 60251352T 51KOHM 5 1...

Page 55: ...6V 1 PCS CU126 67G309V100 3K 10UF 20 16V 1 PCS CU127 67G309V100 3K 10UF 20 16V 1 PCS DU111 81G 12 1 GP GP32032ME 1 PCS DU112 81G 12 1 GP GP32032ME 1 PCS DU113 81G 12 1 GP GP32032ME 1 PCS DU114 81G 12...

Page 56: ...3S 2 B SMD CHOKE 90 OHM SRC 13 1 PCS LU102 73L253S 2 B SMD CHOKE 90 OHM SRC 13 1 PCS LU103 73L253S 2 B SMD CHOKE 90 OHM SRC 13 1 PCS LU104 73L253S 2 B SMD CHOKE 90 OHM SRC 13 1 PCS LU105 71G 59C121 B...

Page 57: ...ARD 1 PCS 5G6012 1 LIFT RUBBER 1 PCS 12G 394 3 RUBBER FOOT 4 PCS 15G5962 1 BASE PLATE 1 PCS 15G6050 1 BRACKET 3 PCS 19G 574500 SPRING 1 PCS 33G4647 GM L COVER TILT 1 PCS 33G4648 GM L COVER STAND 1 PCS...

Page 58: ...CB 1 PCS CN301 33G3802 4H WAFER 4P RIGHT ANGLE 1 PCS CN302 33G3802 2H WAFER 2P RIGHT ANGLE 1 PCS CN303 33G3802 2H WAFER 2P RIGHT ANGLE 1 PCS FB301 71G 55502 CORE RF BEAD 1 PCS FB302 71G 55502 CORE RF...

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