AOC 919SWA manual Power Board, No Power

Page 33

19" LCD Color Monitor

9.2.2Power Board

1. No Power

Check ZD902 = 16V

NG

Check AC line volt 110V or 240V

NG

OK

Check the voltage of C905(+)

NG

OK

Check start voltage for the pin3 of IC901

NG

OK

Check the auxiliary voltage

NG

OK

Check IC901 pin8 PWM wave

NG

OK

Check IC903,IC904,Q901,D906,D907

AOC 919Swa

Check AC input

Check bridge rectified circuit and F901 circuit

Check R904,R905,R906 and Change IC901

1)Check IC901,T901

2)Check OVP circuit

Check IC901

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Contents Service T99LHDDBWKA1ANE Revision Date Revision HistoryT992HDDBWKA2ANE IVO M190MWW3Monitor Specifications LCD Monitor Description Monitor Block DiagramOperating Instructions Adjusting the PictureGeneral Instructions Control ButtonsDCR OSD LED IndicatorDDC-CI Status LED ColorInput Signal Connector Input/Output SpecificationFactory Preset Display Modes Pin Number Pin Side of the Signal CableDisplay Characteristics Panel SpecificationM190MWW3 TPM190A1M190MWW3 TPM190A1 Optical CharacteristicsElectrical Characteristics TFT LCD ModuleBack Light Unit LCD Color Monitor AOC 919Swa Software Flow Chat Block DiagramRemark Main Board Electric Block DiagramFlash Memory DDC1SDA DDC1SCL Eeprom M24C02-WMN6TPAudio Inverter / Power BoardMain Board SchematicLCD Color Monitor AOC 919Swa Output R438 OHM 2W Power 8XFMR Power BoardGND 1 009G6005 IC with Heat-sink90G6295-3 PCB Layout LCD Color Monitor AOC 919Swa Power Board LCD Color Monitor AOC 919Swa Key Board Equipments and Tools Requirement MaintainabilityNo power Trouble ShootingNo picture LED orange OK NG White ScreenPower Board LED No Backlight Key Board White- Balance, Luminance Adjustment LCD Color Monitor AOC 919Swa Monitor Exploded View Description Location Description Remark BOM ListPW9941LHD1SMT Power Board for SMT HS1 ConnectorCbpc Label SUB 15PIN Vertical Conn with ScrewIC M24C04-WMN6TP SO8 IC AP1117E18LA SOT223-3L AnachipPMBS3906/PHILIPS-SMT06 KEC 2N3904S-RTK/PSRST Chip 390R 1/16W 5% Fenghua Chip Bead Chip 22PF 50V NPOChip Bead 300OHM OHM BeadRST Chip MAX FET FDS8958A SO-8RST Chipr 5.1K 1ST ChiprRST Chipr RST Chipr MAX0R05 4A 1/4W FenghuaNPO X7RTact Switch 2PIN RLZ 5.6B Llds PW9941LHD1AI Power Board for AIJumper Wire Diode LBAV70LT1G SOT-23 LRCPower Board PCB