AOC E941VA, E941SA service manual Check flow chart, For the no signal

Page 41

Service Manual

AOCe941series

No picture (LED orange)

	No picture	Check flow chart
		for the no signal
	Check signal wire
	NG	Replace signal wire
	OK	Replace signal wire
	OK
	Check U404 Vout=3.3V;
	Q409-out=1.8V
	NG	replaceU404,Q409,Q410,Q405
	OK	replaceU404,Q409,Q410,Q405
	OK	&around device
		&around device
	check X401 waveform
	NG	replace X401
	OK	replace X401
	OK
	Check CN101-RGB/HS/VS
	NG	Check Correspondent
	OK	component
	Check U402/U403 out
	NG	Updata soft data
	OK	Updata soft data
	OK
	Replace U401
	Whitescreen

White screen			Check flow chart
White screen			For the white screen
			For the white screen
Measure Q404-base	NG	Check X401 waveform
is low level?				NG
				NG
OK		OK		Replace X401
				Replace X401
Check Q405=5V
Check Q405=5V		Check U403/U402
Or CN403 solder?		Check U403/U402
NG			NG	Check around
NG	Check around			Check around
	Check around			device
OK	device	OK
OK		OK
Check connector		Updata soft
Replace Panel		Replace U402/U403/U401
		41

Image 41

Contents AOC e941VA /e941SA /e941S LCD 显示器维修手册Revision List Contents Product Features LCD SpecificationsTTL USB HUBXGA Factory preset modesSxga WxgaDCR Operation instructionControl Buttons OSD Lock Function OSD User mode adjustmentDVI Connector VGA 15pin ConnectorInterface description +5VDCUSB+ Audio in port Electrical Characteristics Panel FeatureGeneral Specifications Electrical Absolute Ratings AOCe941Series Optical Specifications LED ConnectorMainBoard Block Diagram 1e941VA---715G3737 Block DiagramLCD Block Diagram EMI 2e941SA---715G3225IC-PWM MOS SETSoftware Flow Chart Software Flow ChartMain Board 1---715G3737-M01 Circuit SchematicDetvga DVI-input/DDC Power part---5V/3.3V/1.8V Scarlar---Flash/key Output---LVDS connector Bladj Blon Main Board 2---715G3225-1-2R101 TO252 AOCe941Series VSC 715G2892-P02---adapter 12V/5V Power BoardConverter Board----715G3918-P02 Phonejack Audio part 715G2892 P02Key Board 715G4007-K01 Explore Views AOCe941Series AOCe941Series MainBoard 1- 715G3737-M01 PCB LayoutAOCe941series Main Board 2---715G3225-1-2 AOCe941series PowerBoard 715G2892-P02 KeyBoard ---715G4007 Trouble Shooting Main Board---No Power Maintenance Trouble treatmentCheck flow chart For the no power Maintainability RequirementFor the no signal Check flow chartCheck flow chart No Backlight of panel Key Board---OSD no working Writing DDC program step AOCe941series AOCe941series Model：e941VA--T995NTNBWVK2PNJ BOM ListChoke Coil Screw AD91603YY1SMTJ Power Board for SMTChoke by LI TA AC SocketRST Chipr MAX 0R05 1/10W Fenghua IC FAN6752MY SOP-8RST Chipr 1KOHM +-1% 1/10W Yageo RST Chipr 10KOHM +-1% 1/10W YageoEyelet AD91603YY1AIJ Power Board for AIIC AS431AZTR-E1 TO-92 TRA KTD1028 KECRectifier Diode FR107 Jumper WireLNPCA9361XYY1J Convertor Board PIN Header 2.54MM 2PRST Chipr 10K OHM +-5% 1/10W Fenghua RST Chip 1K 1/10W 5% Tzai YuanRST Chip 100K 1/10W 5% Tzai Yuan RST Chipr 1 OHM +-5% 1/10W YageoConn 6PIN Connector 9PWafer RST Mofr 4.7 OHM +-5% 2WS FutabaRST Chip 10R 1/16W 5% Tzai Yuan RST Chipr 10 OHM +-5% 1/16W FenghuaRST Chipr 100 OHM +-5% 1/16W Fenghua RST Chip 100R 1/16W 5% Tzai YuanRST Chip 1K 1/16W 5% Tzai Yuan RST Chipr 1KOHM +-5% 1/16W FenghuaRST Chipr 10KOHM +-5% 1/16W Fenghua RST Chip 10K 1/16W 5% Tzai YuanRST Chipr 470 OHM 5% 1/16W Fenghua Tzai YuanRST Chip 470R 1/16W 5% Tzai Yuan RST Chipr 4.7KOHM +-5% 1/16W FenghuaAOCe941series Chip Bead CAP Chip 4U7 10V X7RDiode LBAV70LT1G SOT-23 LRC Dome Switch 5 PCS SMTKEPCAJA9RLZ5.6B RLZ 5.6B LldsModel：e941SA--T995NSNCWVA1UNJ CBPC9NWA1QHJ Screw M3X6RST Chipr 1KOHM +-1% 1/8W Yageo RST Chipr 15KOHM +-1% 1/10W YageoCN901 006G R906 061G152M10452T XZ RST Chipr SOC Subd H 15P F SUB 15PINSUB 15PIN Vertical Conn with Screw SMTC9NWA1QHJ Main Board for SMTRST Chipr 0 OHM +-5% 1/16W Yageo RST Chipr 10KOHM +-5% 1/16W Yageo RST Chipr 1KOHM +-5% 1/16W YageoRST Chip 330R 1/16W 5% Fenghua RST Chip 390R 1/16W 5% FenghuaRST Chipr 56KOHM 1/16W Tzai Yuan RST Chipr 56KOHM 1/16W FenghuaRST Chipr 75 OHM +-5% 1/16W Fenghua RST Chipr 75OHM +-5% 1/16W YageoAOCe941series X5R X7ROHM Bead BAV70 SOT23 by PAN JITJ44G9909101 Eps J44G9909201 J44G9909615 4A Model：e941S-- T9A2NS2DWVA4QNE Main BOARD-CBPCANSA1H1 SMTCA-U402 ADA1603HD1SMT Power Board for SMT LNPCA9401XHD1PC123Y22FZOF Sharp AC Socket ST-01CP-BCE-RRST Chipr 10 Kohm +-1% 1/10W Fenghua ADA1603HD1AI Power Board for AIRST Chipr MAX RST Chipr 1MOHM +-5% 1/4W Tzai YuanNO-SUGGEST RST Chipr 100 OHM +-5% 1/16W NO-SUGGEST RST Chipr MAX 0R05 OHM 1/16WNO-SUGGEST RST Chipr 1KOHM +-5% 1/16W YA NO-SUGGEST RST Chipr 10KOHM +-5% 1/16W YNO-SUGGEST RST Chipr 75OHM +-5% 1/16W YA NO-SUGGEST RST Chipr 330 OHM +-5% 1/16WMain Board PCB Chip Bead 120OHM 6A MGLB2012-120T-LFLED GPTD1210YGC3-HB KEY Board PCBAC/DC Converter TA9690GN-A1-0-TR SOP-24 Adapter Board PCBRST Chip 1R 1/10W 5% Tzai Yuan RST Chip 120K 1/10W 5% Tzai YuanConverter Board PCB CAP ChipSchottky B3100B 3A 100V SMB

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