Acer G185H - Page 52

1
4.4 Inverter trouble shooting
Backlight can’t be turned on
N
o raste
r
?
LED Green?
Yes
Yes
Yes
Backlight can’t be
turned on.
No
Check power
supply
Is there high-level voltage on
pin4 of IC501?
No
Is Ok R502?
Check I/F board
Yes
R502 open
No
Yes
Is there instantaneously pulse wave on pin1, pin11,
pin14 of IC501 at the moment of restart?
No
Is Ok IC501?
Yes
U501, fail
No
IC501 fail
Yes
Is ok T501,?
T501 fail
Are connected rightly
CN501, CN502?
No
Connecting the
output connector
again
No
Check feedback circuit LI1, LI2,
OV1, OV2
Yes
END
Is there 14Vdc voltage on
pin9 of IC501?
Yes
Yes