White Screen - BenQ E2220HD Service Manual

21.5" LCD Color Monitor

(3) White screen

Check Q701, Q702 is broken
or CN408 solder?
Check Correspondent
component.
White Screen
Measure Q702 base
is low level?
OK
NG
OK
Replace Panel
NG
X401 oscillate
waveform is normal
OK
Check U401
OK
Check reset circuit of
U401 is normal
NG
Check Correspondent component.
72
BenQ E2220HD
NG
Replace X401
NG
Replace U401