Trouble Shooting Guide - BenQ G2010WP Service Manual

5.6 Trouble Shooting Guide

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