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AOC 172V, Service Manual

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AOC 172V Service Manual Download Page 29

17" LCD Color Monitor

                       

                               AOC 172V

 

29                                                                                                                    

9.2 Trouble Shooting 

9.2.1 Main Board 

1. NO SCREEN APPEAR 

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 

Measure U702 PIN2=3.3V 

Reinsert or check the 
power section 

X401 oscillate waveforms 
are normal 

Measure CN701 PIN5/6=12V? 
Measure CN701 PIN9/10=5V?

 

Replace U401 

Replace X401

 

OK 

OK 

OK 

NG 

NG 

NG 

NG 

Check power 
section 

NG 

OK 

Replace U702 

Summary of Contents for 172V

Page 1: ...rol Button 5 3 3 Adjusting the Picture 5 4 Input Output Specification 7 4 1 Input Signal Connector 7 4 2 Factory Preset Display Modes 7 5 Panel Specification 8 5 1 Display Characteristics 8 5 2 Optica...

Page 2: ...17 LCD Color Monitor AOC 172V 2 Revision List Revision Date Revision History TPV Model A00 Mar 03 2008 Initial release T78SM5NCARSPNNE...

Page 3: ...ck 135MHz typ Max Resolution 1280 x 1024 75Hz Plug Play VESA DDC2BTM ON Mode 47W Power Consumption OFF Mode 2W Input Connector D Sub 15pin Analog 0 7Vp p standard Input Video Signal 75 OHM Positive Ho...

Page 4: ...ogic brightness 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 HOST Computer AC IN 100V 240V PWPC bo...

Page 5: ...l light up 3 2 Control Buttons 1 Power Button Power Indicator 2 MENU ENTER 3 Contrast 4 Brightness 5 Auto Config Exit 3 3 Adjusting the Picture 1 Press the MENU button to activate the OSD window 2 Pre...

Page 6: ...B N A Recall sRGB from EEPROM User Red Red Gain from Digital register User Green Green Gain Digital register Color Temp User Blue Blue Gain from Digital register Yes N A Auto Adjust the H V Position F...

Page 7: ...10 11 15 4 2 Factory Preset Display Modes STANDARD RESOLUTION HORIZONTAL FREQUENCY kHz VERTICAL FREQUENCY Hz Dos mode 640 350 31 47kHz 70Hz Dos mode 720 400 31 47kHz 70Hz VGA 640 480 31 47kHz 60Hz 640...

Page 8: ...17 LCD Color Monitor AOC 172V 8 5 Panel Specification 5 1 Display Characteristics 5 2 Optical Characteristics...

Page 9: ...17 LCD Color Monitor AOC 172V 9 5 3 Parameter guide line for CCFL Inverter 1 TFT LCD Module 2 Back Light Unit...

Page 10: ...17 LCD Color Monitor AOC 172V 10 6 Block Diagram 6 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 11: ...e 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 interrup...

Page 12: ...6 2 Electric Block Diagram 6 2 1 Main Board FLASH MEMORY PM25LV512A U402 Scalar TSUM16AK Include MCU ADC OSD etc U401 EEPROM 24C02 U404 H sync V sync RGB DB12_SDA DB15_SCL LCD Interface CN101 EEPROM 2...

Page 13: ...fier and Filter Start Circuit R905 R906 R907 R908 R909 R910 PWM Control IC Transformer Over Voltage Protect Rectifier diode AC input 5V 12V ON OFF Control PWM Control IC Feedback Circuit OSC and Outpu...

Page 14: ...9 PB 0 5 PB 6 11 GPO 0 4 OSP VLCD_12V PB 12 23 TSUM16AK PA 0 7 3V3 PA 8 13 VCC1 8 PA 14 19 PB 6 11 B4 4 SCALER RIN GIN SOG BIN GNDR GNDG GNDB HSYNC VSYNC Adj_BACKLIGHT VCC1 8 Vcc3 3 VCTRL PA 0 7 PA 8...

Page 15: ...4K7 D C 5V R703 2K 1 16W 4 7K C716 0 1uF 5V R710 NC on_Panel 4 R31 C708 1uF R716 NC Q701 PMBS3904 R31 GND 5V 3 4 5V GND H3 TP 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 C719 NC 10uF 16V VCC1 8 4 VLCD C718 0...

Page 16: ...16W R443 100 1 16W C433 0 047uF DET_VGA 4 SOG 4 B 4 R460 10K 1 16W R467 10 1 16W R436 56 1 16W GNDR 4 DDCD_SCL 4 ESD_5V VSYNC 4 CN406 JACK DVI 1 2 3 4 5 6 7 8 25 28 9 10 11 12 13 14 15 16 26 29 17 18...

Page 17: ...PA 8 13 5 CLK 3 G 3 GIN 3 BIN 3 KEY_A CN404 CONN 2 4 6 8 10 12 14 1 3 5 7 9 11 13 C409 0 1uF U403 AT24C16N 10SC 2 7 1 2 3 4 5 6 7 8 A0 A1 A2 GND SDA SCL WP VCC CLK 3 VCC3 3 PA0 PA16 PA5 R406 10K 1 16W...

Page 18: ...FR1P C107 NC NC 12V RA2N CLKBN R108 NC NC PB7 PA 14 19 4 R90 V B1N BR1P BB3P STV2 FB2N NC PA18 LVB3M FG0P NC GB2N RXO2 RXOC GPOO2 PA1 LVB1M RA1P GA2N RB1N LVB3M 0R R92 V GA3P BB2P NC STV1 QDI 17 B0P...

Page 19: ...17 LCD Color Monitor AOC 172V 19 7 2 Power Board...

Page 20: ...17 LCD Color Monitor AOC 172V 20...

Page 21: ...17 LCD Color Monitor AOC 172V 21 8 PCB Layout 8 1 Main Board...

Page 22: ...17 LCD Color Monitor AOC 172V 22...

Page 23: ...17 LCD Color Monitor AOC 172V 23...

Page 24: ...17 LCD Color Monitor AOC 172V 24 8 2 Power Board...

Page 25: ...17 LCD Color Monitor AOC 172V 25...

Page 26: ...17 LCD Color Monitor AOC 172V 26...

Page 27: ...17 LCD Color Monitor AOC 172V 27 8 3 Key Board...

Page 28: ...C 172V 28 9 Maintainability 9 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 Servi...

Page 29: ...and look if the picture is normal Please reinsert and make sure the AC of 100 240 is normal Measure U702 PIN2 3 3V Reinsert or check the power section X401 oscillate waveforms are normal Measure CN70...

Page 30: ...ure OK OK NG NG Measure U401 PIN28 3 3V Replace U401 X401 oscillate waveforms are normal Replace X401 Check if the sync signal from computer is output and video cable is connected normally Input the s...

Page 31: ...ltage of C905 Check bridge rectified circuit and F901 circuit 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 t...

Page 32: ...2V NG OK Change Q201 or Q202 NG OK Change U201 Check D201 D202 have the output of square wave at short time NG OK Check Q205 Q206 Q207 Q208 NG Check the output of PT201 PT202 Check Q209 Q210 Q211 Q212...

Page 33: ...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 C...

Page 34: ...ch 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 until chrom...

Page 35: ...17 LCD Color Monitor AOC 172V 35 11 Monitor Exploded View...

Page 36: ...6177 KGA1L LOGO COVER H40G 17N61514C 172V ID label H41G170061512B 172V MANUAL H44G3749615 7C CARTON H45G 87 1 2H R PE BAG FOR MONITOR Q45G 76 28 H A PE BAG FOR MANUAL Q52G6020 68 AOC PROTECT FILM CN70...

Page 37: ...00 OHM 5 R488 61G0603101 RST CHIPR 100 OHM 5 R704 61G0603101 RST CHIPR 100 OHM 5 R446 61G0603102 RST CHIPR 1KOHM 5 1 R447 61G0603102 RST CHIPR 1KOHM 5 1 R476 61G0603102 RST CHIPR 1KOHM 5 1 R477 61G060...

Page 38: ...2 CHIP 0 1UF 50V X7R C410 65G0603104 32 CHIP 0 1UF 50V X7R C411 65G0603104 32 CHIP 0 1UF 50V X7R C412 65G0603104 32 CHIP 0 1UF 50V X7R C413 65G0603104 32 CHIP 0 1UF 50V X7R C414 65G0603104 32 CHIP 0 1...

Page 39: ...6ST D411 93G 39147SEM ZMM5V6ST D412 93G 39147SEM ZMM5V6ST D407 93G 64 42 P BAV70 SOT 23 D702 93G 6432P LL4148 D403 93G 6433P BAV99 D404 93G 6433P BAV99 D405 93G 6433P BAV99 D401 93G 39S 45 T RLZ36B BY...

Page 40: ...8 KBP208G CN102 95G8021 12529 HARNESS H1 J85G8113 1 SHIELD IC901 56G 379 53 LD7552BN Q209 57G 761501 BTC5706I3 Q210 57G 761501 BTC5706I3 Q211 57G 761501 BTC5706I3 Q212 57G 761501 BTC5706I3 705G 780 57...

Page 41: ...805105 27 CHIP 1UF Y5V 0805 C209 65G0805105 27 CHIP 1UF Y5V 0805 C210 65G0805105 27 CHIP 1UF Y5V 0805 C211 65G0805105 27 CHIP 1UF Y5V 0805 C212 65G0805105 27 CHIP 1UF Y5V 0805 C219 65G0805105 27 CHIP...

Page 42: ...4 R238 61G172S12352T RST CFR 12KOHM 5 1 4 R239 61G172S12352T RST CFR 12KOHM 5 1 4 R210 61G172S15352T RST CFR 15KOHM 5 1 4 R211 61G172S15352T RST CFR 15KOHM 5 1 4 R220 61G172S15352T RST CFR 15KOHM 5 1...

Page 43: ...5G517K102 5T69 21 1000PF 10 500V Y5P C921 65G517K102 5T69 21 1000PF 10 500V Y5P C907 67G 2152207NT ELCAP 22UF 20 50V 10 C207 67G 305479 7T ELCAP 4 7UF 20 50V 1 90G6064 1 HEAT SINK D912 93G 60217 FMB29...

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