HannStar HQ171D Service Manual page 52

H a n n S t a r D i s p l a y C o r p .
Document Title
Document No.
2.) No Backlight
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?
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HQ171D_XY _HSM
Check C811 (+) =12V
NG
OK
Check ON/OFF signal
NG
OK
CheckIC801 pin 2=5V?
NG
OK
NG
OK
NG
OK
NG
OK
Replace backlight
Check power section
Check Interface section or main board
Check Q801 Q802 Q803 ZD801
Check IC801 pin 5/pin6
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
Page No. 52
Revision
Replace IC801
NG
Check Q801 Q802
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07/08/09