Asus VB191D Service Manual Download Page 37 | Manualshive

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19" LCD Color Monitor ASUS VB191D

37

8.2.2 Power/Inverter Board

1.) No power

Check CN902 pin4, 5 = 12V

Check AC line volt 110V or 220V

Check the voltage of C905 (+)

Check bridge rectified circuit and F901 circuit

Check start voltage for the pin8 of IC901

Check R904, R932, R933 and Change IC901

Check the auxiliary voltage is bigger than

10V and smaller than 20V

2) Check R909, D901 circuit

Check IC903, IC904, Q901, ZD921, ZD922, D906, D907

Check IC901 pin6 PWM wave

Check IC901

NG

NG

OK

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Summary of Contents for VB191D

Page 1: ...ruction 6 3 1 General Instructions 6 3 2 Control Button 6 3 3 OSD Menu 7 4 Input Output Specification 11 4 1 Input Signal Connector 11 4 2 Power Supply Requirements 11 4 3 Factory Preset Display Modes 12 4 4 Panel Specification 13 5 Block Diagram 16 5 1 Software Flow Chart 16 5 2 Electrical Block Diagram 18 6 Schematic 20 6 1 Main Board 20 6 2 Power Board 25 7 PCB Layout 27 7 1 Main Board 27 7 2 P...

Page 2: ...19 LCD Color Monitor ASUS VB191D 2 Revision List Version Release Date Revision History TPV Model Name A00 Aug 06 2007 Initial release T97HMWDDHGUSN h t t p w w w w j e l n e t ...

Page 3: ...s 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 or implied arising out of any unauthorized modification of design Servicer assumes all liability FOR PRODUCTS CONTAINING LASER DANGER Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM CAUTION Use of co...

Page 4: ... Display Color 16 7M 6 bits Hi FRC Dot Clock 150MHz Contrast Ratio 1000 1 White Luminance 300cd m2 Max Resolution 1280 x 1024 Plug Play VESA DDC2BTM Power Source 100 240VAC 47 63Hz Input Connector D Sub 15pin Input Video Signal Analog 0 7Vp p standard 75 OHM Positive Safety Certifications UL CUL FCC CE Gost R BSMI CCC VCCI C Tick CB RoHS required PSB Maximum Screen Size Horizontal 410 4mm Vertical...

Page 5: ...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 board Include adapter inverter Flat Panel and CCFL backlight Main Board RS232 Connector For white balance adjustment in factory mode CCFL Drive Video signal DDC Key Board HOST Computer h t t p w w w w j e l n e t ...

Page 6: ...ocated at the front of the panel 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 Press the power button to turn on the monitor the power indicator will light up 3 2 Control Buttons 3 2 1 Key Control h t t p w w w w j e l n e t ...

Page 7: ...19 LCD Color Monitor ASUS VB191D 7 3 2 2 Key Function 3 3 OSD Menu 3 3 1 How to Reconfigure h t t p w w w w j e l n e t ...

Page 8: ...19 LCD Color Monitor ASUS VB191D 8 3 3 2 OSD Function Introduction h t t p w w w w j e l n e t ...

Page 9: ...19 LCD Color Monitor ASUS VB191D 9 h t t p w w w w j e l n e t ...

Page 10: ...19 LCD Color Monitor ASUS VB191D 10 h t t p w w w w j e l n e t ...

Page 11: ...C Serial Clock 8 Blue Ground VGA connector layout 1 5 6 10 11 15 4 2 Power Supply Requirements A C Line voltage range 100 V 240 V A C Line frequency range 50 3Hz 60 3Hz Input Voltage transients 90 264 voltage AC for 10 sec 40 Current 1 5A max at 100V 0 8A max at 240 V Peak surge current 60A peak at 240 VAC and cold starting 30A peak at 120VAC and cold starting Leakage current 3 5mA Power line surg...

Page 12: ...19 LCD Color Monitor ASUS VB191D 12 4 3 Factory Preset Display Modes h t t p w w w w j e l n e t ...

Page 13: ... Features _ 19 SXGA TFT LCD Panel _ 4 CCFLs Backlight System _ Supported SXGA V 1024 lines H 1280 pixels Resolution _ Supported to 75Hz Refresh Rate _ LCD Timing Controller _ RoHS Compliance _ VESA Compatible 4 4 2 Display Characteristics h t t p w w w w j e l n e t ...

Page 14: ...19 LCD Color Monitor ASUS VB191D 14 4 4 3 Electrical Characteristics 1 TFT LCD 2 Backlight h t t p w w w w j e l n e t ...

Page 15: ...19 LCD Color Monitor ASUS VB191D 15 4 4 4 Optical Characteristics h t t p w w w w j e l n e t ...

Page 16: ...19 LCD Color Monitor ASUS VB191D 16 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 h t t p w w w w j e l n e t ...

Page 17: ...t 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 interrupt request 14 Wake up the scalar 15 Are there any signals coming from analog port 16 Display No connection Check Signal Cable message And go into standby mode after the message disappear 17 Program the scalar to b...

Page 18: ...Board Flash Memory PM25LV010A U402 Panel Interface CN703 SDA SCL Crystal 14 318MHZ X401 Keypad Interface CN404 Scalar TSUM16AWK LF Include MCU ADC OSD U401 D Sub Connector CN401 EEPROM M24C02 U403 H sync V sync RGB VGA_SDA VGA_SCL EEPROM M24C16 U406 h t t p w w w w j e l n e t ...

Page 19: ...Start Circuit R904 R932 R933 PWM Control IC Transformer AC input 12V ON OFF Control Feedback Circuit Transformer MOSFET Lamp ON OFF 5V Bridge Rectifier and Filter Feedback Circuit Rectifier diodes CN902 Output Circuit PWM Control IC IC801 Over Voltage h t t p w w w w j e l n e t ...

Page 20: ..._BACKLIGHT Adj_BACKLIGHT VCC1 8 VLCD 5V VCC3 3 12V I2C_MDA I2C_MCL Adj_BL2 B5 5 PANEL INTERFACE VLCD PA 0 9 PB 0 9 5V 715G2571 1 2 E TOP B 1 2 6 Monday May 07 2007 Title Size Document Number Rev Date Sheet of VCC1 8 5V TSUM16AWK SCHEMATIC VLCD B4 4 SCALER RIN GIN SOG BIN GNDR GNDG GNDB HSYNC VSYNC Adj_BACKLIGHT VCC1 8 VCC3 3 PA 0 9 R R G G B B CLK CLK DDCD_SDA DDCD_SCL DDCA_SDA DDCA_SCL INPUT_DET ...

Page 21: ...1 3 2 1 VI VO GND VCC1 8 C707 0 1uF 16V 715G2571 1 2 Adj_BACKLIGHT 4 C703 NC 1uF 10V C704 0 1uF 16V R712 10KΩ 1 10W C710 0 1uF 16V on_BACKLIGHT 4 on_Panel 4 C702 100uF 25V 5V U702 3 2 1 VI VO GND R707 NC Q704 PMBS3906 C708 10uF 50V Adj_BL2 4 Q702 PMBS3904 R718 10K 1 16W C706 10uF 50V R721 NC C705 0 1uF 16V C713 NC D701 SMAL140 VCC1 8 4 5V R716 NC A Power B 2 6 Monday May 07 2007 Title Size Documen...

Page 22: ...ZD407 NC CN402 NC 1 2 3 4 5 6 7 8 25 28 9 10 11 12 13 14 15 16 26 29 17 18 19 20 21 22 23 24 27 32 31 DAT2 DAT2 2 4shield DAT4 DAT4 DDC SCL DDC SDA VSYNC R HSYNC DAT1 DAT1 1 3shield DAT3 DAT3 5V SYNC GND HPD G RGB GND DAT0 DAT0 0 5shield DAT5 DAT5 clk shield clk clk B GND GND ZD401 MM3Z5V6B R409 100R 1 16W BLUE GNDG 4 DAT0 R426 NC INPUT_DET 4 R434 NC D412 BAV70 3 1 2 C412 220pF C417 NC CLK 4 RED R...

Page 23: ...P LVA2P RA2 RA1N LVA2M RA3 RA2P LVA1P RA4 RA2N LVA1M RA5 RA3P LVA0P RA6 RA3N LVA0M RA7 CLKAP LVB3P LHSYNC CLKAN LVB3M LVSYNC CLKBP LVBCKP LCK_ODD CLKBN LVBCKM LDE NC LVB2P NC NC LVB2M NC BB1P LVB1P BB2 BB1N LVB1M BB3 BB2P LVB0P BB4 BB2N LVB0M BB5 NC LVACKP NC GA3N LVA3M GA7 GA3P LVA3P GA6 GND GND NC NC NC NC AVDD_ADC NC NC NC NC GND GND GND VDDP VDDC MODE 1 MODE 0 VCTRL VDDP VDDC DDCA_SDA DDCA_SCL...

Page 24: ...LVB1M PB9 LVBCKM LVB0M PB4 LVBCKP PB5 LVA3M LVA2P LVA3M LVACKM LVA0M LVACKP RXO1 PB 0 9 4 RXO1 RXE2 LVA2M LVB1P PA7 R714 300Ω 1 4W PB8 LVA0P RXO3 PA1 LVB1P A PANEL INTERFACE A 5 6 Monday May 07 2007 Title Size Document Number Rev Date Sheet of PA 0 9 LVBCKP PA0 LVA1M VLCD 2 LVB3M LVA1P RXOC RXO0 PA5 LVB1M RXEC R713 300Ω 1 4W 715G2571 1 2 LVA3P RXO2 LVA2P C712 22uF 50V RXO2 PA 0 9 4 LVB3P LVB2P LVA...

Page 25: ...918 100 1 4W D905 NC 1 2 3 C929 0 001uF R908 100K 2W C922 NC IC901 TEA1530AT 1 2 3 4 5 6 7 8 Vcc GND PROTECT CTRL SENSE DRIVER HVS DRAIN R905 NC R924 1K5 1 10W FG C905 100uF 450V C901 0 001uF 250V R961 100 1 4W R920 100 1 4W T901 POWER X FMR 4 7 9 5 6 4 6 11 10 8 12 1 3 IC904 KIA431A AT P ZD901 NC 1 2 FG C939 1000uF 25V C916 0 1uF R931 8K2 1 8W R916 1K5 1 8W C917 680uF 25V C931 0 1uF D900 BA159GPT...

Page 26: ...0W 1 R833 10K 1 10W R813 10K 1 10W 1 R822 1K 1 10W 1 C839 1000pF R837 47K 1 8W F801 0R05 1 4W CN804 CONN 1 2 D805 BAW56 3 1 2 C B E Q801 PMBS3904 R828 10K 1 10W C834 0 1uF 25V C807 0 1uF 25V C845 2 2uF 16V R835 1M 1 10W 5 D817 LL4148WP R806 68K 1 1 10W R805 NC C805 0 1uF R801 1K 1 10W 1 D804 BAV99 3 1 2 C820 220pF R855 33 1 4W Q809 RK7002 C835 NC R831 2 4K 1 1 10W T802 POWER X FMR 1 4 8 3 7 9 C842...

Page 27: ...19 LCD Color Monitor ASUS VB191D 27 7 PCB Layout 7 1 Main Board 715G2571 1 2 h t t p w w w w j e l n e t ...

Page 28: ...19 LCD Color Monitor ASUS VB191D 28 h t t p w w w w j e l n e t ...

Page 29: ...19 LCD Color Monitor ASUS VB191D 29 h t t p w w w w j e l n e t ...

Page 30: ...19 LCD Color Monitor ASUS VB191D 30 7 2 Power Board 715G2538 1 h t t p w w w w j e l n e t ...

Page 31: ...19 LCD Color Monitor ASUS VB191D 31 h t t p w w w w j e l n e t ...

Page 32: ...19 LCD Color Monitor ASUS VB191D 32 7 3 Key Board 715G2546 2 h t t p w w w w j e l n e t ...

Page 33: ...3 8 Maintainability 8 1 Equipments And Tools Requirement 1 Voltmeter 2 Oscilloscope 3 Pattern Generator 4 DDC Tool with Compatible Computer 5 Alignment Tool 6 LCD Color Analyzer 7 Service Manual 8 User Manual h t t p w w w w j e l n e t ...

Page 34: ...ook if the picture is normal Please reinsert and make sure the AC of 100 240 is normal Reinsert or check the Adapter Inverter section X401 oscillate waveforms are normal Replace D701 U701 or U702 Replace U401 Replace X401 OK OK OK NG NG NG NG Measure U701 PIN2 3 3V Measure U702 PIN2 1 8V h t t p w w w w j e l n e t ...

Page 35: ...eplace D701 U701 or U702 X401 oscillate waveforms are normal Replace X401 Check if the sync signal from computer is output and video cable Input the sync signal of computer or change Replace U401 NG OK Measure U701 PIN2 3 3V Measure U702 PIN2 1 8V h t t p w w w w j e l n e t ...

Page 36: ... is broken or CN703 solder Check Correspondent component Replace Panel Check Correspondent component Replace U401 OK OK Replace X401 OK NG NG NG NG Check reset circuit of U401 is normal OK X401 oscillate waveform is normal Measure Q704 base is low level h t t p w w w w j e l n e t ...

Page 37: ...k bridge rectified circuit and F901 circuit Check start voltage for the pin8 of IC901 Check R904 R932 R933 and Change IC901 NG Check the auxiliary voltage is bigger than 10V and smaller than 20V 1 Check IC901 2 Check R909 D901 circuit OK OK NG Check IC903 IC904 Q901 ZD921 ZD922 D906 D907 OK Check IC901 pin6 PWM wave OK Check IC901 NG NG NG OK NG h t t p w w w w j e l n e t ...

Page 38: ... NG OK Check IC801 PIN12 12V NG OK Change Q808 or Q805 Check IC801 PIN10 9 have the output of square wave at short NG OK Change IC801 Check Q802 Q803 PIN5 6 7 8 have the output of square wave at short time NG OK Check Q801 Q804 Q811 Q812 Q802 Q803 Check the output of T801 T802 Check connecter lamp OK NG Change T801 T802 h t t p w w w w j e l n e t ...

Page 39: ...Board 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 Check Main Board h t t p w w w w j e l n e t ...

Page 40: ...lor temp parameter is x 313 20 y 329 20 Y 150 15cd m2 3 Into Factory mode of ASUS VB191D Press the MENU button pull out the power cord and then plug the power cord Then the factory OSD will be at the left top of the panel 4 Bias adjustment Set the Contrast to 50 Adjust the Brightness to 80 5 Gain adjustment Move cursor to F and press MENU key A Adjust Warm 6500K color temperature 1 Switch the chro...

Page 41: ... indicator reached the value G 100 6 Adjust the BLUE of color1 on factory window until chroma 7120 indicator reached the value B 100 7 Repeat above procedure item 4 5 6 until chroma 7120 RGB value meet the tolerance 100 2 D Adjust sRGB color temperature 1 Switch the chroma 7120 to RGB Mode with press MODE button 2 Switch the MEM channel to Channel 10 with up or down arrow on chroma 7120 3 The LCD ...

Page 42: ...19 LCD Color Monitor ASUS VB191D 42 10 Monitor Exploded View h t t p w w w w j e l n e t ...

Page 43: ...B E089B 089G414A18N YH POWER CABLE E095A 095G801412X 80 WIRE HARNESS 0M1G 130 5120 SCREW 0M1G 930 5 47 CR3 SCREW 0M1G1730 6120 SCREW 0M1G1730 6120 SCREW 0M1G1730 6120 SCREW 705GQ734090 STAND ASS Y 19 0Q1G1740 10120 SCREW A34G0326ADJ 1B STAND A37G0037 2 HINGE E750L 750GLH90N3A11N PANEL HSD190MEN3 A 19 HANNSTAR A15G0215 3 MAINFRAME A33G0188ADJ 1L BUTTON FUNC A33G0189 1 1C LENS POWER A34G0323ADJ 1B 3...

Page 44: ...8 Q402 057G 417 4 PMBS3904 PHILIPS SMT 04 Q701 057G 417 4 PMBS3904 PHILIPS SMT 04 Q702 057G 417 4 PMBS3904 PHILIPS SMT 04 Q403 057G 417 6 PMBS3906 PHILIPS SMT 06 Q404 057G 417 6 PMBS3906 PHILIPS SMT 06 Q704 057G 417 6 PMBS3906 PHILIPS SMT 06 Q409 057G 758 1 2N7002ESOT23 SILICONIX Q408 057G 758 1 2N7002ESOT23 SILICONIX Q703 057G 763 1 A03401 SOT23 BY AOS A1 R476 061G0402101 RST CHIPR 100 OHM 5 1 16...

Page 45: ...T CHIP 20K 1 16W 5 R446 061G0402220 RST CHIPR 22 OHM 5 1 16W R447 061G0402220 RST CHIPR 22 OHM 5 1 16W R415 061G0402222 RST CHIPR 2 2 KOHM 5 1 16W R413 061G0402222 RST CHIPR 2 2 KOHM 5 1 16W R456 061G0402223 RST CHIPR 22 KOHM 5 1 16W R466 061G0402241 RST CHIP 240R 1 16W 5 R470 061G0402241 RST CHIP 240R 1 16W 5 R442 061G0402390 0F RST CHIP 390R 1 16W 1 R499 061G0402470 RST CHIPR 47 OHM 5 1 16W R502...

Page 46: ...714 061G1206301 RST CHIPR 300 OHM 5 1 4W C451 065G0402102 32 1000PF 10 50V X7R C452 065G0402102 32 1000PF 10 50V X7R C453 065G0402102 32 1000PF 10 50V X7R C710 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C709 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C707 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C705 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C704 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C447 065G040210...

Page 47: ... CHIP 0 047UF 16V X7R C430 065G0402473 12 CHIP 0 047UF 16V X7R C410 065G0402473 12 CHIP 0 047UF 16V X7R C409 065G0402473 12 CHIP 0 047UF 16V X7R C408 065G0402473 12 CHIP 0 047UF 16V X7R C407 065G0402473 12 CHIP 0 047UF 16V X7R C406 065G0402473 12 CHIP 0 047UF 16V X7R FB409 071G 56Z601 CHIP BEAD 600 OHM 0805 FB408 071G 56Z601 CHIP BEAD 600 OHM 0805 FB407 071G 56Z601 CHIP BEAD 600 OHM 0805 FB406 071...

Page 48: ...TOUKE TS 9 TMG 553 SW104 077G 604 2 TO TACT 5W BY TOUKE TS 9 TMG 553 SW103 077G 604 2 TO TACT 5W BY TOUKE TS 9 TMG 553 SW102 077G 604 2 TO TACT 5W BY TOUKE TS 9 TMG 553 SW101 077G 604 2 TO TACT 5W BY TOUKE TS 9 TMG 553 LED101 081G 14 12 KT CHIP LED ZD101 093G 39P599 T MM3Z5V6B ZD102 093G 39P599 T MM3Z5V6B 715G2546 2 KEY BOARD PCB PWPC942HU3 POWER BOARD CN801 033G8021 2E F WAFER CN802 033G8021 2E F...

Page 49: ...YS04170127 CN901 087G 501 32 S AC SOCKET BD901 093G 50460 28 BRIDGE DIODE KBP208G LITEON D907 093G3006 1 1 31DQ06FC3 NIHON INTER CN902 095G8014 9D 58 HARNESS 9P 9P 210MM 705G 193 57 01 Q901 ASS Y Q901 057G 667 21 STP10NK70ZFP 090G6263 1 HEAT SINK AM1G1730 8120 GP SCREW 705G 193 93 01 D906 ASS Y D906 093G 60218 SB10100FCT AM1G1730 8120 GP SCREW Q90G6274 2 HEAT SINK IC801 056G 379 22 IC TL494IDR SOI...

Page 50: ...834 061G0603100 2F RST CHIPR 10 KOHM 1 1 10W R833 061G0603100 2F RST CHIPR 10 KOHM 1 1 10W R832 061G0603100 2F RST CHIPR 10 KOHM 1 1 10W R828 061G0603100 2F RST CHIPR 10 KOHM 1 1 10W R817 061G0603100 2F RST CHIPR 10 KOHM 1 1 10W R862 061G0603105 RST CHIPR 1 MOHM 5 1 10W R835 061G0603105 RST CHIPR 1 MOHM 5 1 10W R851 061G0603130 2F RST CHIPR 13 KOHM 1 1 10W R924 061G0603152 RST CHIPR 1 5 KOHM 5 1 1...

Page 51: ... OHM 5 1 4W F902 061G1206000 RST CHIPR 0 OHM 5 1 4W JR802 061G1206000 RST CHIPR 0 OHM 5 1 4W JR803 061G1206000 RST CHIPR 0 OHM 5 1 4W JR801 061G1206000 RST CHIPR 0 OHM 5 1 4W R967 061G1206000 RST CHIPR 0 OHM 5 1 4W JR901 061G1206000 RST CHIPR 0 OHM 5 1 4W JR809 061G1206000 RST CHIPR 0 OHM 5 1 4W JR808 061G1206000 RST CHIPR 0 OHM 5 1 4W JR807 061G1206000 RST CHIPR 0 OHM 5 1 4W JR805 061G1206000 RST...

Page 52: ...F 50V NPO C931 065G0805104 32 CHIP 0 1U 50V X7R C930 065G0805104 32 CHIP 0 1U 50V X7R C916 065G0805104 32 CHIP 0 1U 50V X7R C907 065G0805104 32 CHIP 0 1U 50V X7R C824 065G0805104 32 CHIP 0 1U 50V X7R C805 065G0805104 32 CHIP 0 1U 50V X7R C822 065G0805105 22 CHIP 1UF 25V X7R 0805 C928 065G0805122 31 CHIP CAP 0805 1200PF J 50V NPO C820 065G080522131G 220PF 50V NPO 2 C911 065G0805224 22 CAIP CAP 0 22...

Page 53: ...164 COMPOUND PALLET Q40G 19N68015A RATING LABEL Q40G000268013A TRY ME LABEL Q40G000268014A TCO 03 LABEL Q40G000268026A SPLENDID LABEL VB191D ZBD Q41G780068024A CHINA WARRANTY CARD Q41G780068034A QSG VB171D VB191D Q44G6002CP212A PAPER CAP Q44G9091 1 EPS L Q44G9091 2 EPS R Q44G9091680 2A 19 LCD CARTON Q45G 76 28V13 R PE BAG Q45G 88607 25 PE BAG FOR BASE Q45G 88609 87 EPE COVER FOR MONITOR Q45G 88614...

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