LG L192WS-BNQ Service Manual page 16

No raster?
Yes
LED Green?
Yes
Backlight can't
be turned on.
Yes
Is there 5Vdc
voltage on pin2 of
IC501?
Yes
Is there high-level voltage
on pin10 of IC501?
Yes
Are connected rightly
CN501, CN502, CN503 and
CN504?
Yes
Is there instantaneously pulse wave on
pin1, pin3, pin15 of IC501 at the
moment of restart?
Yes
Is ok T501, T502?
Yes
Check feedback circuit
Isen,Vsen.(D501,D502.D503,D504,D507,D508)
2. Backlight can't be turned on
No
Check power
supply
No
Is Ok R526?
No
No
No
16
Yes
Check I/F
board
No
R526 open
Connecting the
output connector
again
Yes
Is Ok IC501?
No
T501, T502 fail
U501, U502 fail
IC501 fail
END