Optima L903A Service Manual Download Page 18 | Manualshive

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Optima L903A Service Manual Download Page 18

19" Wide LCD Color Monitor

Optima L903A

18

5.2.2 Inverter / Power Board

AC inlet

Filter

Rectifier and
filter

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

Push-pull

circuit

LC resonant

Lamp

Dimming control

Feedback circuit

To main board

12V

OVP/OCP circuit

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Summary of Contents for L903A

Page 1: ...uction 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 Specifi...

Page 2: ...19 Wide LCD Color Monitor Optima L903A 2 Revision List Revision Date Revision History TPV Model A00 Dec 25 2006 Initial release T96HNNHLWCOPAP...

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: ...16 2M Colors Dot Clock 135MHz Max Resolution 1440 900 60Hz 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 OH...

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: ...o 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 Backligh...

Page 9: ...ource 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 In...

Page 10: ...nd 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 1...

Page 11: ...equency 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 0H...

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 Optima L903A 13 4 3 2 Optical Characteristics...

Page 14: ...19 Wide LCD Color Monitor Optima L903A 14 4 3 3 Parameter guide line for CCFL Inverter TFT LCD Module Back Light Unit...

Page 15: ...19 Wide LCD Color Monitor Optima L903A 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: ...Block 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: ...ilter 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 P...

Page 19: ...19 Wide LCD Color Monitor Optima L903A 19 6 Schematic 6 1 Main Board...

Page 20: ...19 Wide LCD Color Monitor Optima L903A 20...

Page 21: ...19 Wide LCD Color Monitor Optima L903A 21...

Page 22: ...19 Wide LCD Color Monitor Optima L903A 22...

Page 23: ...19 Wide LCD Color Monitor Optima L903A 23...

Page 24: ...5 NC 1 4 2 3 L901 2 0MH R904 100K 1 4W Title Size Document Number Rev Date Sheet of 1 1 POWER OUTPUT 12V 5 V AOC Top Victory Electronics Co Ltd 1 1 Friday July 21 2006 C910 470pF 50V C931 1000PF 500V...

Page 25: ...3 0 1uF OPT2 OPT3 R813 1M 1 8W C808 0 0068uF C829 0 1uF Title Size Document Number Rev Date Sheet of 1 HP W19 series 17 19 4 LAMPS INVERTER AOC Top Victory Electronics Co Ltd 1 1 Tuesday February 27 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: ...D 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 Optima L903A 28 7 PCB Layout 7 1 Main Board...

Page 29: ...19 Wide LCD Color Monitor Optima L903A 29...

Page 30: ...19 Wide LCD Color Monitor Optima L903A 30...

Page 31: ...19 Wide LCD Color Monitor Optima L903A 31 7 2 Power Board...

Page 32: ...19 Wide LCD Color Monitor Optima L903A 32...

Page 33: ...19 Wide LCD Color Monitor Optima L903A 33 7 3 Key Board 7 4 Audio Board...

Page 34: ...tima L903A 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: ...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 U70...

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 I...

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: ...A 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 Sw...

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 Optima L903A 42 10 Monitor Exploded View...

Page 43: ...H04 WIRE HARNESS 0M1G 340 8225 CR3 SCREW 0M1G1140 6128 CR3 SCREW 0M1G1730 6128 CR3 SCREW 0M1G1730 6128 CR3 SCREW 0M1G1730 6128 CR3 SCREW 0M1G2430 5225 CR3 SCREW 0Q1G 330 8120 SCREW 3X8MM 0Q1G 330 8120...

Page 44: ...N406 033G801930F H FPC CONN 1 0MM 30P CN701 033G8027 12 WAFER 2 6P 2 0MM R A CN702 033G8027 14 WAFER 14P 2 0MM DIP DUAL ROW CN403 033G8027 16 WAFER 16PIN 2 0MM DIP 040G 457624 1B LABEL CPU 040G 457624...

Page 45: ...1 10W R441 061G0603101 RST CHIPR 100 OHM 5 1 10W R440 061G0603101 RST CHIPR 100 OHM 5 1 10W R489 061G0603101 RST CHIPR 100 OHM 5 1 10W R488 061G0603101 RST CHIPR 100 OHM 5 1 10W R453 061G0603101 RST...

Page 46: ...75 OHM 5 1 10W R455 061G0603750 RST CHIPR 75 OHM 5 1 10W R456 061G0603750 RST CHIPR 75 OHM 5 1 10W R473 061G1206151 RST CHIPR 150 OHM 5 1 4W R444 061G1206151 RST CHIPR 150 OHM 5 1 4W C461 065G0603102...

Page 47: ...0N P C410 065G0603104 12 CER2 0603 X7R 16V 100N P C411 065G0603104 12 CER2 0603 X7R 16V 100N P C413 065G0603104 12 CER2 0603 X7R 16V 100N P C414 065G0603104 12 CER2 0603 X7R 16V 100N P C416 065G060310...

Page 48: ...D409 093G 39P599 T MM3Z5V6B ZD410 093G 39P599 T MM3Z5V6B ZD411 093G 39P599 T MM3Z5V6B ZD412 093G 39P599 T MM3Z5V6B ZD413 093G 39P599 T MM3Z5V6B ZD414 093G 39P599 T MM3Z5V6B ZD401 093G 39S 34 T UDZS5 6...

Page 49: ...8021 2D U 3 5MM WAFER CN804 033G8021 2D U 3 5MM WAFER CN801 033G8021 2E F WAFER CN802 033G8021 2E F WAFER CN803 033G8021 2E F WAFER CN804 033G8021 2E F WAFER 040G 45762420A LABEL 25X6MM IC902 056G 139...

Page 50: ...1G1730 6120 GP M3 6 SCREW 705GQ9K3 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...

Page 51: ...05105 1MOHM 1 10W C808 061G0805184 RST CHIPR 180 KOHM 5 1 8W R926 061G0805202 RST CHIP 2K 1 8W 5 R924 061G0805240 1F 2 4KOHM 1 10W 1 R802 061G0805304 RST CHIPR 300 KOHM 5 1 8W R923 061G0805330 2F 33 K...

Page 52: ...31 1000PF 50V NPO C807 065G0805103 32 10NF 50V 0805 X7R C919 065G0805104 32 CHIP 0 1U 50V X7R C918 065G0805104 32 CHIP 0 1U 50V X7R C917 065G0805104 32 CHIP 0 1U 50V X7R C916 065G0805104 32 CHIP 0 1U...

Page 53: ...IN4148W D812 093G 64S511SEM IN4148W D813 093G 64S511SEM IN4148W PW942MA1AIP POWER BOARD FOR AI CN901 006G 31500 EYELET C905 006G 31502 1 5MM RIVET F901 006G 31502 1 5MM RIVET L901 006G 31502 1 5MM RI...

Page 54: ...M4 RIVET 002F6570100 M4 RIVET 002F6365276 M3 RIVET 002F6370276 M4 RIVET 002F6365284 M3 RIVET 002F6355204 M3 RIVET 002F6370072 M4 RIVET 002F6370148 M4 RIVET 015F 008200 SGCC 015F 008200 B1 SGCC 0 8 340...

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