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AOC LM923, Service Manual

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AOC LM923 Service Manual Download Page 28

                                                                                                                                                                           

 AOC LM923  

Page 28 of 55

 

7. PCB Layout 

7.1 MAIN BOARD   

   

 715L1237-1 

 

 
 
 
 
 
 
 
 

http://www.wjel.net

Summary of Contents for LM923

Page 1: ...OR 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 DI...

Page 2: ...cs 11 4 4 3 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 Powe...

Page 3: ...AOC LM923 Page 3 of 55 REVISION LIST Revision Date Revision History TPV Model A00 Nov 28 05 First Version Release T980KAXHLFMRA h t t p w w w w j e l n e t...

Page 4: ...0kHz 83kHz Input V Frequency 55 75Hz Dot Clock 135MHz Contrast Ratio 700 1 White Luminance 250cd m2 Max Resolution 1280 x 1024 Plug Play VESA DDC2BTM ON Mode 55W Power Consumption OFF Mode 2W Power So...

Page 5: ...ogic 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 inver...

Page 6: ...Right Button The Left Right Button 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...

Page 7: ...D TABLE Main Menu Item Main Menu Icon Sub Menu Item Sub Menu Icon Description Contrast Contrast from Digital register Luminance Brightness Backlight Adjustment Focus Adjust Picture Phase to reduce Hor...

Page 8: ...OSD display language to English 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 displ...

Page 9: ...NO DESCRIPTION PIN NO DESCRIPTION 1 Red Video 9 5V 2 Green Video 10 Detect Cable 3 Blue Video 11 NC 4 Ground 12 DDC Serial Data 5 Ground 13 H Sync 6 Red Ground 14 V Sync 7 Green Ground 15 DDC Serial C...

Page 10: ...024 768 60 021kHz 75 0Hz 1280 1024 64 000kHz 60 0Hz SXGA 1280 1024 80 000kHz 75 0Hz 4 3 POWER SUPPLY REQUIREMENTS A C Line voltage range 100 V 240 V A C Line frequency range 50 3Hz 60 3Hz Current 1 5A...

Page 11: ...AOC LM923 Page 11 of 55 4 4 PANEL SPECIFICATION 4 4 1 Display Characteristics 4 4 2 Optical Characteristics h t t p w w w w j e l n e t...

Page 12: ...AOC LM923 Page 12 of 55 4 4 3 Parameter guide line for CCFL Inverter h t t p w w w w j e l n e t...

Page 13: ...M 5 1 MONITOR EXPLODED VIEW hinge ass y 37G 490 1 Key pad 33G4713 AS L clamp 33G4695 1 C bezel 34G1275AKG 3B rear cover 34G1276 GM 4B stand 34G1273 GM B base 34G1277 GM B main frame 15G6093 AU shield...

Page 14: ...AOC LM923 Page 14 of 55 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: ...green 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 u...

Page 16: ...Board MCU W78E65 U601 Scalar IC MST8111B Include ADC OSD U401 EEPROM AT24C16N U602 EEPROM 24C02 U301 H sync V sync RGB DB15_SDA DB15_SCL EPR_SDA EPR_SCL LCD Interface CN503 Key Board Control D Sub Con...

Page 17: ...ctifier and Filter Start Circuit R906 R907 PWM Control IC Transformer Rectifier diode AC input 12V ON OFF Control PWM Control IC Feedback Circuit OSC and Output Circuit DC Convert Circuit MOSFET Over...

Page 18: ...RESET DDC_CLK Volume VCC5V VCC12V VCPU RXD TXD AD0 AD1 AD2 AD3 VCC3 3 VCC2 5 VCC5V VCPU B4 2 POWER onPanel_5V 3 3V onBACKLITE AdjBACKLITE VCC3 3 VCC2 5 VAA1 VAA2 VAA3 VAA4 VCC5V VCC12V VLCD VCPU VLCD...

Page 19: ...C203 0 1uF Q203 AO3401 C215 47uF 16V GND C210 0 1uF C B E VCC2 5 4 C216 0 1uF POWER D B 2 6 Wednesday November 10 2004 Title Size Document Number Rev Date Sheet of GND VAA1 C205 0 1uF VAA3 VCC5V 3 4 6...

Page 20: ...011 8111 FOR AOC D306 BAV99 3 1 2 CLK 4 R316 100 1 16W ST_DET2 6 CLK_DDC2 D308 BAV99 3 1 2 R327 75 1 16W R302 100 1 16W FB302 0 1 16W D310 BAV99 3 1 2 R 4 INPUT D B 3 6 Wednesday November 10 2004 Titl...

Page 21: ...9 57 37 38 40 41 43 44 46 47 49 50 52 66 67 69 70 71 32 72 73 74 107 55 35 45 3 51 11 21 84 94 104 114 126 18 87 97 117 39 56 36 2 54 42 10 20 85 95 115 127 19 86 96 105 116 33 34 108 109 110 111 112...

Page 22: ...1 0 1uF PB3 LVBCKM LVB1P PB4 RXO2 RXO0 CN503 CONN 2 4 6 8 10 12 14 16 18 20 22 24 1 3 5 7 9 11 13 15 17 19 21 23 PB9 LVBCKP PB8 RXO3 LVA0M LVACKP VLCD LVACKM LVA3P LVA2M PB 0 9 RXO0 PB6 PA1 C510 0 1uF...

Page 23: ...NC DDC_CLK 3 OUT L OUT R Q604 NC 3 2 1 LED_O OUT R FB603 600 OHM Volume 4 VCC5V MPU D B 6 6 Wednesday November 10 2004 Title Size Document Number Rev Date Sheet of VCPU POWER ENTER R624 470 1 16W VCPU...

Page 24: ...ITOR FOR NMV A TI_TDA3003D2 TDA3002D2 3W 9W AUDIO C 1 1 Thursday December 04 2003 Title Size Document Number Rev Date Sheet of GND C136 1 0uF 71L59B121 R125 0K R101 NC 0K 715L1279 A CIRCUIT 2003 12 03...

Page 25: ...AOC LM923 Page 25 of 55 6 3 POWER BOARD 715G1142 4 AUE h t t p w w w w j e l n e t...

Page 26: ...AOC LM923 Page 26 of 55 h t t p w w w w j e l n e t...

Page 27: ...AOC LM923 Page 27 of 55 h t t p w w w w j e l n e t...

Page 28: ...AOC LM923 Page 28 of 55 7 PCB Layout 7 1 MAIN BOARD 715L1237 1 h t t p w w w w j e l n e t...

Page 29: ...AOC LM923 Page 29 of 55 7 2 AUDIO BOARD 715L1279 A h t t p w w w w j e l n e t...

Page 30: ...AOC LM923 Page 30 of 55 7 3 POWER BOARD 715G1142 4AUE 7 4 KEY BOARD 715L1205 1 C3 h t t p w w w w j e l n e t...

Page 31: ...NABILITY 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 Ma...

Page 32: ...normal 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 Adapter Inverter section X601 and X401 oscillate waveforms are normal Check...

Page 33: ...place X601 Measure U201 PIN2 2 5V U202 PIN2 3 3V Check Correspondent component Replace U401 X401 oscillate waveform is normal Replace U201 U202 OK OK OK OK OK NG NG NG NG Check reset circuit of U601 i...

Page 34: ...low level X601 oscillate waveform is normal Check Q204 is broken or CN503 solder Check Correspondent component Replace PANEL Check Correspondent component Replace U601 OK OK OK Replace X601 OK NG NG N...

Page 35: ...02 pin2 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...

Page 36: ...U201 PIN1 have the output of sawtooth wave at short time NG OK Change U201 Check D201 D202 have the output of square wave at short time NG OK Check Q203 Q205 Q207 D201 Check Q204 Q206 Q208 D202 Check...

Page 37: ...OSD is 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 Ch...

Page 38: ...to Channel 3 with up or down arrow on chroma 7120 3 The LCD indicator on chroma 7120 will show x 296 20 y 311 20 Y 180 cd m2 4 Adjust the RED of color1 on factory window until chroma 7120 indicator r...

Page 39: ...78 2A 6D 65 A2 5A 4C 9D 23 32 13 4F 54 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...

Page 40: ...CARD 1 PCS 41G190061524A MANUAL 1 PCS 41G780061528B WARRANTY CARD 1 PCS 44G3231 15 EVA WASHER 1 PCS 44G3231 15506 EVA WASHER 1 PCS 44G3904 1 EPS L 1 PCS 44G3904 2 EPS R 1 PCS 44G3904 5 U TYPE SHEET 1...

Page 41: ...AND 1 PCS 34G1275AKG 3B BEZEL 1 PCS 37G 490 1 HINGE ASS Y 1 PCS Q1G1030 8128 SCREW 1 PCS Q1G1030 10128 SCREW 2 PCS Q1G1040 10128 TAP 4X8 FOR SP 2 PCS E078L 78G 326 1 L SPEAKER L 1 PCS E078R 78G 326 1...

Page 42: ...0V X7R 1 PCS C118 65G0603102 32 1000PF 10 50V X7R 1 PCS C120 65G0603103 32 0 01UF 10 50V X7R 1 PCS C121 65G0603104 12 CER2 0603 X7R 16V 100N 1 PCS C122 65G0603104 12 CER2 0603 X7R 16V 100N 1 PCS C123...

Page 43: ...SM 0603 RC0603 10K 1 PCS R119 61L0603103 RST SM 0603 RC0603 10K 1 PCS R120 61L0603103 RST SM 0603 RC0603 10K 1 PCS R121 61L0603103 RST SM 0603 RC0603 10K 1 PCS R122 61L0603121 CHIPR 120 OHM 1 10W 1 P...

Page 44: ...3 32 CHIP 0 047UF 50V X7R 1 PCS C310 65G0603473 32 CHIP 0 047UF 50V X7R 1 PCS C311 65G0603330 31 CER1 0603 NP0 50V 33P P 1 PCS C312 65G0603221 31 CER1 0603 NP0 50V 220P 1 PCS C313 65G0603104 32 CHIP 0...

Page 45: ...00PF 10 50V X7R 1 PCS C609 65G0603102 32 1000PF 10 50V X7R 1 PCS C610 65G0603102 32 1000PF 10 50V X7R 1 PCS C611 65G0805105 22 CHIP 1UF 25V X7R 0805 1 PCS C612 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C...

Page 46: ...PCS R201 61L0603472 RST SM 0603 RC0603 4K7 1 PCS R202 61L0603103 RST SM 0603 RC0603 10K 1 PCS R203 61L0603102 RST SM 0603 RC0603 1K P 1 PCS R204 61L0603103 RST SM 0603 RC0603 10K 1 PCS R205 61L060347...

Page 47: ...C0603 10K 1 PCS R502 61L0603000 RST SM 0603 JUMP MAX 0R 1 PCS R601 61L0603103 RST SM 0603 RC0603 10K 1 PCS R602 61L0603103 RST SM 0603 RC0603 10K 1 PCS R604 61L0603103 RST SM 0603 RC0603 10K 1 PCS R60...

Page 48: ...6A 24LC16B SNG SOIC 8PIN 1 PCS U603 56G 643 5A MAX810 STRG 1 PCS KEPC980KA9 AIK980KA9SMT KEY BOARD FOR T980K 1 PCS CN101 33G801716A H CONNECT 16 PIN SMT 1 PCS CN102 88G 30211K PHONE JACK 5PIN 1 PCS CN...

Page 49: ...7 14 Q901 ASS Y 1 PCS 705L 980 61 02 R914 ASS Y 1 PCS 705L 980 61 03 NR901 ASS Y 1 PCS 705L 980 65 01 19 C901 ASS Y 1 PCS 705L 980 87 01 CN901 ASS Y 1 PCS 705L 980 93 03 D910 D911 ASS Y 1 PCS 705L 980...

Page 50: ...6G 139 3A PC123Y22FZOF 1 PCS L101 73G 253152 T CHOKE COIL TDK LSHAOO3C 1 PCS L201 73G 253139 HA CHOKE COIL 1 PCS L202 73G 253139 HA CHOKE COIL 1 PCS L203 73G 174 30YSA FILTER 1 PCS L204 73G 174 30YSA...

Page 51: ...PF 50V NPO 1 PCS C911 65G0805104 32 CHIP 0 1U 50V X7R 1 PCS C912 65G0805104 32 CHIP 0 1U 50V X7R 1 PCS C913 65G1206102 72 CHIP 1000PF 500V X7R 1 PCS C917 65G0805104 32 CHIP 0 1U 50V X7R 1 PCS C918 65G...

Page 52: ...1 10W 1 PCS R208 61L0603472 RST SM 0603 RC0603 4K7 1 PCS R209 61L0603472 RST SM 0603 RC0603 4K7 1 PCS R212 61L0603392 CHIP 3 9K OHM 1 10W 1 PCS R213 61L0603392 CHIP 3 9K OHM 1 10W 1 PCS R215 61L060322...

Page 53: ...65G 450104 7T 0 1UF 80 20 50V Y5V 1 PCS C205 65G 450104 7T 0 1UF 80 20 50V Y5V 1 PCS C206 65G 450104 7T 0 1UF 80 20 50V Y5V 1 PCS C207 67G 305330 7T 33UF 105 1 PCS C208 65G 44233113T 330PJNPO 50V 1 P...

Page 54: ...S R223 61G 60212352T 12KOHM 5 1 6W 1 PCS R232 61G 60210252T CFR 1K OHM 5 1 6W 1 PCS R233 61G 60210252T CFR 1K OHM 5 1 6W 1 PCS R234 61G 17291152T 910OHM 5 1 4W 1 PCS R235 61G 17291152T 910OHM 5 1 4W 1...

Page 55: ...65G305M1022BP Y2 1000PF M 250VAC Y5P 1 PCS 95G 900 42 WIRE HARNESS 1 PCS 96G 29 6 SHRINK TUBE UL CSA 1 PCS CN901 87G 501 19 RF AC SOCKET 1 PCS 90G6081500 HEAT SINK 1 PCS M1G1730 8128 SCREW M3x8 2 PCS...

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