ViewSonic VE150 Service Manual - Page 24

VE150(b)-2 Service Manual 9. TROUBLE SHOOTING FLOW CHART No Display Check Y801 • No Check P104 pin5,6 is 12V Dark Check LED Color Amber Check 1O cable is Y connect OK? Check VP signal is in pwr saving state? V Yes Check P104 pin/ is 3.3V P104 pin2 is 5V P104 pin3 is 5V V No Check 1805,O802,O801,D812 Green Amber & Green Check X002 Crystal 12MHz is working? No V Check 1002 is OK? V Press pwr key ON/OFF is OK? (See LED is green or dark.) Yes V No Ow Check up 1009 is OK? No Or• Change 1009 Yes 'V Press "1" key if OSD menu is on display? Yes No 10. Check Keypad OK? PCB is Yes ► Check if Inverter is OK? No V Change Inverter V Check 1003 AD9884 is No working? Yes V Check X001 Crystal No 14.318MHz is working? Change 1003 Change X001 Yes Check panel Vpn1 No signal P005 pin4,5 is +5V? Check O001,O002 is OK? Yes V Check P005,P006 data bus have signal Yes • Change 1005 LCD controller IC No • Change LCD panel ViewSonic Corporation -21Confidential - Do Not Copy 6/29/2001