Brightness Ckt Check - Acer V551 Service Manual

Acer V551 (new) CRT Monitor Service Guide

7. Brightness CKT check

Brightness
control error
Yes
Check IC801
No
PWM output
ok?
Yes
Is the voltage of
No
C305 –190V?
Yes
Check Q202
No
base is low?
Yes
Check Q203
& M101
Confidence and Property
Chapter 4 Trouble Shooting
Replace IC801
Check T303,
R324, D303
Check Blank/
]Hunlock ckt
8