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AOC 1912VWA, Service Manual

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AOC 1912VWA Service Manual Download Page 35

19" Wide LCD Color Monitor           

 

                      AOC 1912VWA 

35                                                                                                                    

8.2 Trouble Shooting 

8.2.1 Main Board 

(1) No Power 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 

No power

 

Press power key and look if the 
picture is normal 

Please reinsert and make sure the 
AC of 100-240 is normal 

Reinsert or check the 
power section

X401 oscillate waveforms are 
normal 

Measure U701 Pin2=3.3V, 

U702 Pin2=1.8V?

OK 

OK 

NG

NG 

NG 

Replace U701, U702 

Replace U401 

Replace X401 

OK 

NG

Summary of Contents for 1912VWA

Page 1: ...ction 6 3 1 General Instructions 6 3 2 Control Button 6 3 3 Adjusting the Picture 8 4 Input Output Specification 10 4 1 Input Signal Connector 10 4 2 Factory Preset Display Modes 11 4 3 Panel Specific...

Page 2: ...19 Wide LCD Color Monitor AOC 1912VWA 2 Revision List Revision Date Revision History TPV Model A00 Dec 27 2006 Initial release T96HNNNQWCAO8P...

Page 3: ...y characteristics may create shock fire or other hazards Under no circumstances should the original design be modified or altered without written permission from AOC AOC assumes no liability express o...

Page 4: ...z Plug Play VESA DDC2BTM ON Mode 36W EPA ENERGY STAR OFF Mode 1W Input Connector 15 pin D Sub Input Video Signal Analog 0 7Vp p standard 75 OHM Positive Maximum Screen Size Horizontal 408 24mm Vertica...

Page 5: ...ightness control logic 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 Monitor Block Diagram AC IN 100V 240V Power...

Page 6: ...ont of the monitor By changing these settings the picture can be adjusted to your personal preferences The power cord should be connected Connect the video cable from the monitor to the video card Pre...

Page 7: ...Function To lock the OSD press and hold the MENU button while the monitor is off and then press power button to turn the monitor on To un lock the OSD press and hold the MENU button while the monitor...

Page 8: ...adjust any other function repeat steps 2 3 The OSD Message Main Menu Item Main Menu Icon Sub Menu Item Sub Menu Icon Description Contrast Contrast from Digital register Luminance Brightness Backlight...

Page 9: ...urce DVI H Position Adjust the horizontal position of the OSD V Position Adjust the vertical position of the OSD OSD Setup OSD Timeout Adjust the OSD timeout Language Language N A Set OSD language Inf...

Page 10: ...d 15 Pin Color Display Signal Cable 1 5 6 10 11 15 Pin No Description Pin No Description 1 TMDS Data 2 13 TMDS Data 3 2 TMDS Data 2 14 5V Power 3 TMDS Data 2 4 Shield 15 Ground for 5V 4 TMDS Data 4 16...

Page 11: ...requency Dos mode 720 x 400 31 47kHz 70 0Hz 640 480 31 47kHz 60 0Hz VGA 640 480 37 50kHz 75 0Hz 800 600 37 879kHz 60 0Hz SVGA 800 600 46 875kHz 75 0Hz 1024 768 48 363kHz 60 0Hz 1024 768 56 476kHz 70 0...

Page 12: ...crystal display LCD that uses amorphous silicon TFT as a switching device This model is composed of a TFT LCD panel the voltage reference common voltage DC DC converter column and row driver circuit T...

Page 13: ...19 Wide LCD Color Monitor AOC 1912VWA 13 4 3 2 Optical Characteristics...

Page 14: ...19 Wide LCD Color Monitor AOC 1912VWA 14 4 3 3 Parameter guide line for CCFL Inverter TFT LCD Module Back Light Unit...

Page 15: ...19 Wide LCD Color Monitor AOC 1912VWA 15 5 Block Diagram 5 1 Software Flow Chat 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...

Page 16: ...n the LED and set it to 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 inte...

Page 17: ...lock Diagram 5 2 1 Main Board EEPROM AT24C16AN 10SU 2 7 U403 Panel Interface CN406 NT68663MEFG Include MCU ADC OSD U401 D Sub Connector CN405 EEPROM M24C02 U405 SDA SCL RXD TXD RGB H SYNC V SYNC DB15_...

Page 18: ...lter Start circuit R904 R931 R938 Transform er Switching circuit PWM control IC MOSFET Rectifier and filter D908 D909 Feedback circuit IC902 IC903 12V 5V Start circuit On off control PWM control IC Pu...

Page 19: ...19 Wide LCD Color Monitor AOC 1912VWA 19 6 Schematic 6 1 Main Board...

Page 20: ...19 Wide LCD Color Monitor AOC 1912VWA 20...

Page 21: ...19 Wide LCD Color Monitor AOC 1912VWA 21...

Page 22: ...19 Wide LCD Color Monitor AOC 1912VWA 22...

Page 23: ...19 Wide LCD Color Monitor AOC 1912VWA 23...

Page 24: ...6 0 1uF L902 73L 174 65 LS 1 4 2 3 D902 FR103 5V C934 JUMP R904 100K 1 4W 5V C900 0 0022UF R941 NC R925 3 6K 0805 1 R922 1K 0805 ZD904 RLZ18B 1 2 IC902 PC123X2YFZOF 1 2 4 3 5V C932 0 0015uF 2KV CN901...

Page 25: ...8W C805 1000pF C831 470pF 50V C801 0 1uF R849 1M 1 8W R863 30 1206 C808 0 0068uF OPT1 C813 332 1206 C842 0 1uF Q809 RK7002 C812 332 1206 CN804 CONN 1 3 4 2 C811 470UF 25V R803 10K 0805 Q806 AM9945 1 2...

Page 26: ...et of CN002 EAR PHONEJACK 1 5 4 3 2 7 8 LED_GRN ESD by jc chen 2006 5 11 CN003 SPK R 1 2 LED_ORANGE SW005 KEY MANU KEY RIGHT SW001 KEY SEL ORANGE GND wire GND GND R102 75 GREEN GND ZD101 BZX79 B5V6 1...

Page 27: ...GND INL VAROUT_L VOLUME VAROUT_R NC INR SVR STBY MUTE GND OUTR VS VS OUTL GND GND GND GND GND OUT_R MUTE ZD202 BZX79 B5V6 1 2 R207 1K 12V R201 18K GND 12V C205 470uF 16V C213 0 1uF C211 100pF C204 0...

Page 28: ...19 Wide LCD Color Monitor AOC 1912VWA 28 7 PCB Layout 7 1 Main Board...

Page 29: ...19 Wide LCD Color Monitor AOC 1912VWA 29...

Page 30: ...19 Wide LCD Color Monitor AOC 1912VWA 30...

Page 31: ...19 Wide LCD Color Monitor AOC 1912VWA 31 7 2 Power Board...

Page 32: ...19 Wide LCD Color Monitor AOC 1912VWA 32...

Page 33: ...19 Wide LCD Color Monitor AOC 1912VWA 33 7 3 Key Board 7 4 Audio Board...

Page 34: ...OC 1912VWA 34 8 Maintainability 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 S...

Page 35: ...o power Press power key and look if the picture is normal Please reinsert and make sure the AC of 100 240 is normal Reinsert or check the power section X401 oscillate waveforms are normal Measure U701...

Page 36: ...NG NG Measure U701 PIN2 3 3V U702 PIN2 1 8V Replace U701 U702 X401 oscillate waveforms are normal Replace X401 Check if the sync signal from computer is output and video cable is connected normally In...

Page 37: ...Measure Q406 base is high level X401 oscillate waveform is normal Check Q406 Q405 is broken or CN406 solder Check Correspondent component Replace Panel Check Correspondent component Replace U401 OK OK...

Page 38: ...board Check AC line volt 120V or 220V Change F901 Check BD901 Q903 IC901 Check the voltage of C905 Check bridge retified circuit Check start voltage for the Pin6 of IC901 Change IC901 OK Check the aux...

Page 39: ...ave square wave Check the output of PT801 PT802 Check ON OFF signal Check IC801 PIN2 5V Check adapter circuit Check Interface board OK OK NG NG Check Q801 Q802 Q803 NG NG OK Check Q805 Q806 have the o...

Page 40: ...40 8 2 3 Key Board OK OK OSD is unstable or not working Is Keypad board connecting normally Is Button Switch normally Is Keypad board normally Check main board Connect Keypad Board Replace Button Swi...

Page 41: ...2 Switch the MEM Channel 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 unti...

Page 42: ...19 Wide LCD Color Monitor AOC 1912VWA 42 10 Monitor Exploded View...

Page 43: ...322501 L SPEAKER E078L 078G 322501 KL SPEAKER E078L 078G 322501 YL SPK 8OHM 1 5W SU E078R 078G 322502 R SPEAKER E078R 078G 322502 KR SPK 8OHM 1 5W KUAIDA E078R 078G 322502 YR SPK 8OHM 1 5W SU 089G 17...

Page 44: ...C208 067G215B471 3N GP KY16VB470M L 8 15MM CN201 088G 30229C PHINE JACL CN201 088G 30229T TN PHONE JACK 5PIN BLUE 090G6059 1 HEAT SINK AIAUPC6QA18 AUDIO BOARD FOR AI R207 061G 60210252T CFR 1K OHM 5...

Page 45: ...401 SOT23 BY AOS A1 FB402 061G0603000 RST CHIPR 0 OHM 5 1 10W FB405 061G0603000 RST CHIPR 0 OHM 5 1 10W FB406 061G0603000 RST CHIPR 0 OHM 5 1 10W R410 061G0603000 RST CHIPR 0 OHM 5 1 10W R411 061G0603...

Page 46: ...KOHM 5 1 10W R430 061G0603103 RST CHIPR 10 KOHM 5 1 10W R419 061G0603103 RST CHIPR 10 KOHM 5 1 10W R418 061G0603103 RST CHIPR 10 KOHM 5 1 10W R417 061G0603103 RST CHIPR 10 KOHM 5 1 10W R415 061G06031...

Page 47: ...P C440 065G0603104 12 CER2 0603 X7R 16V 100N P C439 065G0603104 12 CER2 0603 X7R 16V 100N P C438 065G0603104 12 CER2 0603 X7R 16V 100N P C437 065G0603104 12 CER2 0603 X7R 16V 100N P C436 065G0603104 1...

Page 48: ...C408 065G0603473 32 CHIP 0 047UF 50V X7R FB407 071G 56D102 B201209D102TT FB408 071G 56K121 M CHIP BEAD FB410 071G 56K121 M CHIP BEAD FB411 071G 56K121 M CHIP BEAD FB412 071G 56K121 M CHIP BEAD FB413...

Page 49: ...5 6B ZD409 093G 39S 34 T UDZS5 6B ZD410 093G 39S 34 T UDZS5 6B ZD411 093G 39S 34 T UDZS5 6B ZD412 093G 39S 34 T UDZS5 6B ZD413 093G 39S 34 T UDZS5 6B ZD414 093G 39S 34 T UDZS5 6B D702 093G2040 3F FA20...

Page 50: ...9 3A PC123Y22FZOF NR901 061G 58080 WT 8 OHM NCT C816 065G 3J2206ET 22PF 5 SL 3KV TDK C834 065G 3J2206ET 22PF 5 SL 3KV TDK C837 065G 3J2206ET 22PF 5 SL 3KV TDK C841 065G 3J2206ET 22PF 5 SL 3KV TDK C825...

Page 51: ...Q9K3 57001 Q903 ASS Y Q903 057G 667 21 STP10NK70ZFP AM1G1730 8120 GP SCREW Q90G0035 1 HEAT SINK 705GQ9K3 61001 R905 ASS Y R905 061G152M10458F 100K OHM 5 2W 096G 29 6 H S TUBE 705GQ9K3 61002 R914 ASS Y...

Page 52: ...061G0805105 1MOHM 1 10W R847 061G0805105 1MOHM 1 10W R848 061G0805105 1MOHM 1 10W R849 061G0805105 1MOHM 1 10W R860 061G0805105 1MOHM 1 10W C808 061G0805184 RST CHIPR 180 KOHM 5 1 8W R926 061G0805202...

Page 53: ...OHM 5 1 4W R805 061G1206471 470 1206 R919 061G1206471 470 1206 R851 061G1206472 RST CHIPR 4 7 KOHM 5 1 4W R842 061G1206519 RST CHIPR 5 1 OHM 5 1 4W R837 061G1206519 RST CHIPR 5 1 OHM 5 1 4W R901 061G1...

Page 54: ...64 33 DIO SIG SM BAV99 PHSE R D804 093G 64 33 DIO SIG SM BAV99 PHSE R D803 093G 64 33 DIO SIG SM BAV99 PHSE R D802 093G 64 33 DIO SIG SM BAV99 PHSE R D801 093G 64 33 DIO SIG SM BAV99 PHSE R D904 093G...

Page 55: ...1Z TRANSFORMER ASS Y 034FPE19P03 CASE EEL19 PT801 S80GL19T8V1 TRANSFORMER ASS Y S80GL19T8V1Z TRANSFORMER ASS Y 034FPE19P03 CASE EEL19 Q40G 19N61526A RATING LABEL Q41G900261518B MANUAL Q44G9030 1 EPS L...

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