BenQ G2010WP - Trouble Shooting Guide

35
5.6 Trouble Shooting Guide
Inverter trouble shooting
Backlight can’t be turned on
N
o raster?
LED Green?
Yes
Yes
Yes
Backlight can’t
be turned on.
No
Check power
supply
Is there high-level voltage
on pin8 of IC501?
No
Is Ok R501?
Check I/F board
Yes
R501 open
No
Yes
Is there instantaneously pulse wave on
pin1, pin3, pin15 of IC501 at the
No
Is Ok IC501?
Yes
U501, U502 fail
No
IC501 fail
Yes
Is ok T501, T502?
T501, T502 fail
Are connected rightly
CN501, CN502, CN503 and
No
Connecting the
output connector
again
No
Check feedback circuit
Yes
END
Is there 5Vdc
voltage on pin2 of
Yes
Yes