LG L1718S-BN - - 17" LCD Monitor 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.(D503,D504,D501,D50
2. Backlight can't be turned on
No
Check power supply
No
Is Ok R526?
No
No
Is Ok IC501?
No
16
Yes
Check I/F board
No
R526 open
Connecting the
output
connector
Yes
U501, U502 fail
No
IC501 fail
T501, T502 fail
END