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AOC 2236VWA, Service Manual

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AOC 2236VWA Service Manual Download Page 30

21.5" LCD Color Monitor                                      AOC 2236Vwa 

30 

9.2 Trouble Shooting 

9.2.1 Main Board     

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 U701 Vout =3.3V   
U703 Vout=1.8V 

Reinsert or check the 
power section 

X401 oscillate waveforms 
are normal 

Measure CN701 PIN7=5V? 

Replace U401 

Replace X401

 

OK 

OK 

OK 

NG 

NG 

NG 

NG 

Check power 
section 

NG 

OK 

Replace CN701 

No power 

Summary of Contents for 2236VWA

Page 1: ...ock Diagram 13 7 Schematic 15 7 1 Main Board 15 7 2 Power Board 19 8 PCB Layout 21 8 1 Main Board 21 8 2 Power Board 22 8 3 Key Board 24 9 Maintainability 25 9 1 Equipments and Tools Requirement 25 9...

Page 2: ...haracteristics might 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 or...

Page 3: ...21 5 LCD Color Monitor AOC 2236Vwa 3 Revision List Version Date Revision History Remark A00 Jun 12 2009 Initial release TI9CA8NQ6WA16NE...

Page 4: ...DC2B CI Input Connector D Sub 15pin DVI D Input Video Signal Analog 0 7Vp p standard 75 OHM TMDS Power Source 100 240VAC 50 60Hz Typical 42 W Power Consumption Standby 1 W USB Downstream port A type T...

Page 5: ...ontrol 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 Power Board Include adapter and inverter Flat Panel an...

Page 6: ...e power indicator will light up 3 2 Control Buttons Power Press to turn on or turn off the monitor Source 4 3 or wide Up Press key to change the screen aspect ratio between standard 4 3 format or Wide...

Page 7: ...icture OSD Settings Eco mode DCR Standard Text Internet Game Movie Sports Notes When Eco mode is not set as Standard Contrast and Brightness can not be adjusted When DCR is set as On Contrast Brightne...

Page 8: ...sync 6 GND R 14 V sync 7 GND G 15 DDC Serial clock 8 GND B DVI D 24pin Connector Pin No Signal Name Pin No Signal Name Pin No Signal Name 1 TMDS Data 2 9 TMDS Data 1 17 TMDS Data 0 2 TMDS Data 2 10 T...

Page 9: ...80 72Hz DMT 37 861 72 809 VGA 640 480 75Hz DMT 37 5 75 Dos mode 720 400 70Hz DOS 31 469 70 087 SVGA 800 600 56Hz DMT 35 156 56 25 SVGA 800 600 60Hz DMT 37 879 60 317 SVGA 800 600 72Hz DMT 48 077 72 18...

Page 10: ...id Crystal Display module composed of LCD panel driver ICs control circuit and backlight By applying 6 bit digital data 1920 1080 16 7M color images are displayed on the 21 5 diagonal screen Input pow...

Page 11: ...21 5 LCD Color Monitor AOC 2236Vwa 11 5 2 Optical Characteristics...

Page 12: ...21 5 LCD Color Monitor AOC 2236Vwa 12 5 3 Parameter guide line for CCFL Inverter 1 TFT LCD Module 2 Backlight Unit...

Page 13: ...21 5 LCD Color Monitor AOC 2236Vwa 13 6 Block Diagram 6 1 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...

Page 14: ...n on the LED and set it to green color Scalar initialize 10 In standby mode 11 Update the lifetime of back light 12 Check the analog port are they re any signals coming 13 Does the scalar send out an...

Page 15: ...LASH MEMORY EN25F20 100GCP U402 Scalar TSUMU58EHL LF 1 Include MCU ADC OSD etc U401 LCD Interface CN301 D Sub Connector CN101 H sync V sync RGB EEPROM AZC199 04S U104 VGA_SDA VGA_SCL DVI Connector CN1...

Page 16: ...CN902 DIM EMI filter Bridge Rectifier and Filter Start Circuit PWM Control IC Transformer Rectifier diodes AC input 12V ON OFF Control PWM Control IC Feedback Circuit LC Resonance Transformer MOSFET O...

Page 17: ...pF For BUZZER control board or Touch Panel R452 0R05 1 16W VCC3 3 NC PA0 FB404 300OHM R454 NC R446 NC VPLL CMVCC1 LED O POWER_KEY LED_ORANGE C405 0 1uF 16V 10K 1 16W 5 32 pF CMVCC1 C413 0 1uF 16V C406...

Page 18: ..._G C121 1000pF RX0N R108 75R 1 16W 5 DGND RX1P 5 DDC2_SCL FB103 BEAD 1 2 U103 AZC199 04S 1 2 3 4 5 6 I O1 GND I O2 I O3 VDD I O4 U101 R107 2K2 1 16W 5 R130 10R 1 16W 5 DDC2_SCL 5 C124 0 1uF 16V R135 1...

Page 19: ...20 22 24 26 28 30 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 R301 220 OHM 1 4W PA7 C305 100UF25V RXO0 LVA2P LVA3P RXO1 PB6 CN301 NC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 2...

Page 20: ...V Mute1 BKLT EN R709 NC VCC3 3 DGND 2 3 5 VCC1 8 C707 100UF25V C709 0 1uF 16V PANEL_ID 5 SOT 223 R703 10K 1 16W 5 C713 0 1uF 16V on_BACKLIGHT 5 PANEL_ID R705 1K 1 16W 5 SOT 252 Volume R704 22K 1 16W 5...

Page 21: ...FMW 2156 1 2 3 2008 12 01 D907 IN4148 C938 NC 2008 12 01 D902 SB5150 1 2 L901 30mH 1 4 2 3 FB901 BEAD 1 2 GND1 GND 1 2 U901 LD7576 1 2 3 4 5 6 7 8 CT COMP CS GNDOUT VCC NC HV R933 NC T901 POWER X FMR...

Page 22: ...T VIN BT TG SW VCC BG GND OV1 C811 470uF 25V R809 100K 1 10W 5 R806 10K 1 10W 5 REF RJ807 0R05 1 4W 5 CN801 CONN 1 2 R801 430 OHM 1 10W OV2 CN802 CONN 1 2 R814 10 OHM 5 1 10W LI2 R817 10K 1 10W 5 C813...

Page 23: ...21 5 LCD Color Monitor AOC 2236Vwa 23 8 PCB Layout 8 1 Main Board...

Page 24: ...21 5 LCD Color Monitor AOC 2236Vwa 24...

Page 25: ...21 5 LCD Color Monitor AOC 2236Vwa 25 8 2 Power Board...

Page 26: ...21 5 LCD Color Monitor AOC 2236Vwa 26...

Page 27: ...21 5 LCD Color Monitor AOC 2236Vwa 27 8 3 Key Board 715G3371 1...

Page 28: ...21 5 LCD Color Monitor AOC 2236Vwa 28 8 4 USB Board 715G2663 2 715G3501 2...

Page 29: ...C 2236Vwa 29 9 Maintainability 9 1 Equipments and Tools Requirement 1 Multi meter 2 Oscilloscope 3 Pattern Generator 4 DDC Tool with an Compatible Computer 5 Alignment Tool 6 LCD Color Analyzer 7 Serv...

Page 30: ...if the picture is normal Please reinsert and make sure the AC of 100 240 is normal Measure U701 Vout 3 3V U703 Vout 1 8V Reinsert or check the power section X401 oscillate waveforms are normal Measure...

Page 31: ...NG Measure U701 Vout 3 3V U703 Vout 1 8V Replace U701 U703 X401 oscillate waveforms are normal Replace X401 Check if the sync signal from computer is output and video cable is connected normally Inpu...

Page 32: ...re Q301 Q302 base is low level X401 oscillate waveform is normal Check Q301 Q302 is broken or CN301 solder Check Correspondent component Replace PANEL Check Correspondent component Replace U401 OK OK...

Page 33: ...oltage of C907 Check bridge rectified circuit and F902 circuit Check start voltage for the pin3 of IC901 Check R918 R924 Change IC901 NG Check the auxiliary voltage is bigger than 10V and smaller than...

Page 34: ...OFF signal Check Interface board or main board NG OK Check U801 PIN9 14 5V NG OK Change on off circuit Check U801 PIN8 have triangle wave NG OK Change U801 Check T801 have the output of square wave a...

Page 35: ...35 9 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 Swit...

Page 36: ...4 Adjust the RED of color1 on factory window until chroma 7120 indicator reached the value R 100 5 Adjust the GREEN of color1 on factory window until chroma 7120 indicator reached the value G 100 6 A...

Page 37: ...ess MODE button 2 Switch the MEM channel to Channel 4 with up or down arrow on chroma 7120 3 The LCD indicator on chroma 7120 will show x 313 30 y 329 30 Y 180 cd m2 4 Adjust the RED of color3 on fact...

Page 38: ...21 5 LCD Color Monitor AOC 2236Vwa 38 11 Monitor Exploded View...

Page 39: ...C2003 260MM 0D1G1730 8120 SCREW 0M1G 130 6120 SCREW M3X6 705GH934051 STAND ASS Y E750 750GLC215FA112N000 PANEL CLAA215FA01 000 WJ CPT 2nd source E750 750GLC215FA113N000 PANEL CLAA215FA01 000 FZ CPT 2n...

Page 40: ...2 056G 139 7 1 IC EL817MA M TYPE IC601 056G 616 51 IC APA2071JI TUG 3 1W DIP 16 NR901 061G 58100 WD RST NTCR 10 OHM 20 5A THINKING C908 063G107K224 UM X2 CAP 0 22uF K 275VAC C820 065G 3J6806ET CAP CER...

Page 41: ...61G0603000 RST CHIP MAX 0R05 1 10W R001 061G0603000 RST CHIP MAX 0R05 1 10W R002 061G0603101 RST CHIPR 100 OHM 5 1 10W R007 061G0603561 RST CHIPR 560 OHM 5 1 10W R006 061G0603561 RST CHIPR 560 OHM 5 1...

Page 42: ...03563 RST CHIPR 56 KOHM 5 1 10W R845 061G0603682 RST CHIPR 6 8 KOHM 5 1 10W R844 061G0603682 RST CHIPR 6 8 KOHM 5 1 10W R843 061G0603682 RST CHIPR 6 8 KOHM 5 1 10W R842 061G0603682 RST CHIPR 6 8 KOHM...

Page 43: ...M5 R C610 065G0603101 31 CER1 0603 NP0 50V 100P PM5 R C923 065G0603102 32 1000PF 10 50V X7R C924 065G0603104 22 CAP CHIP 0603 0 1UF K 25V X7R C926 065G0603104 22 CAP CHIP 0603 0 1UF K 25V X7R C613 065...

Page 44: ...SOT23 6L U402 056G1133129 IC EN25F20 100GCP 2Mb SOP 8 U102 056G1133918 IC AT24C02BN SH T 8 SOIC U101 056G1133918 IC AT24C02BN SH T 8 SOIC Q701 057G 417 12 T KEC 2N3904S RTK PS Q302 057G 417 12 T KEC 2...

Page 45: ...5 1 16W R703 061G0402103 RST CHIPR 10 KOHM 5 1 16W R702 061G0402103 RST CHIPR 10 KOHM 5 1 16W R436 061G0402103 RST CHIPR 10 KOHM 5 1 16W R412 061G0402103 RST CHIPR 10 KOHM 5 1 16W R407 061G0402103 RS...

Page 46: ...0 1UF 16V X7R C712 065G0402104 12 CAP CHIP 0402 0 1UF 16V X7R C709 065G0402104 12 CAP CHIP 0402 0 1UF 16V X7R C124 065G0402104 12 CAP CHIP 0402 0 1UF 16V X7R C301 065G0402104 12 CAP CHIP 0402 0 1UF 1...

Page 47: ...G 31500 EYELET PT801 006G 31502 1 5MM RIVET IC903 056G 158 10 T IC AS431AZTR E1 TO 92 Q904 057G 761 16 TRA KTD1028 KEC R906 061G152M10452T RST MOFR 100KOHM 5 2WS R924 061G152M39852T RST MOFR 0 39 OHM...

Page 48: ...5G 90 23 JUMPER WIRE J905 095G 90 23 JUMPER WIRE J904 095G 90 23 JUMPER WIRE J903 095G 90 23 JUMPER WIRE J603 095G 90 23 JUMPER WIRE J602 095G 90 23 JUMPER WIRE J601 095G 90 23 JUMPER WIRE J819 095G 9...

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