Acer AL1917

37
No Backlight
Check VDDA,ENA VDD A = 4.75 ~ 5.25 V,ENA<3V
NG
OK
Check On/Off loo
p
Circui
t
Connect Timer (Pin 3) to GND
Check ENA(pin10),OVPT(pin7),CT(pin13),
DRV1
(p
in1
)
,DRV2
(p
in15
)
of IC801
NG
OK
Change IC801
Check half bridge power conversion
circuit and transformer output circuit.
Check ISEN (pin 5) normally
NG
Check ISEN loo
p
com
p
onents
End Striking function debug
Check VSEN (pin 6) of IC801
Judge VSEN>0.7V&OVPT
Check VSEN circuit form
lamp’s return to VSEN (pin 6)
of IC801
Check pin3 voltage of D801,
D803>2W
End VSEN circuit and
protection loop debug
Check protection circui
t
components short ,open or fail
NG
NG
OK
OK
OK
OK
OK
OK