Hanns.G AG172D Service Manual page 39

17" LCD Color Monitor
2.) No Backlight
Check C811 (+) =12V
Check ON/OFF signal
CheckIC801 pin 2=5V?
Check IC801 Pin1/pin15 have the output of sawtooth wave at short time
Check Q805/Q806 pin5/pin8 is 12V?
Check PT801/PT802 pin7/pin8= 650V?
NG
OK
NG
OK
NG
OK
NG
Check IC801 pin 5/pin6
OK
NG
OK
NG
OK
Replace backlight
Check power section
Check Interface section or main board
Check Q801 Q802 Q803 ZD801
NG
OK
Cut all the pin connector of Q805/Q806, check C811 (+)=12V?
OK
Replace Q805/Q806
Unplug backlight connector wire, check
PT801/PT802 pin7/pin8 = 650V?
OK
NG
Replace PT801/PT802
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Hanns.G AG172D
Replace IC801
NG
Check Q801 Q802