Gateway FPD1965 Service Manual page 32

19" LCD Color Monitor
W / LED, No Backlight
Check VDDA, ENA
VDDA=4.75~5.25V;ENA>3V
OK
Connect TIMER (Pin3) to GND
OK
Check ENA(pin10), OVPT(pin7), CT(pin13), DRV1(pin1),
DRV2(pin15) of IC801
OK
Check half bridge power conversion
circuit and Transformer output circuit
Check ISEN(pin5) normally
End Striking function debug
Check VSEN(pin6) of IC801
OK
Check VSEN circuit form lamp's
return to VSEN(pin6) of IC801
NG
OK
NG
OK
Judge VSEN>0.7V&<OVPT
NG
Check On/Off loop Circuit
NG
Change IC801
Check ISEN loop components
Check pin3 voltage of D801,
D803<2V
OK
End VSEN circuit and
Protection loop debug
32
Gateway FPD1965
Check Protection
circuit, Components
short, open or fail
NG