HP L1940T - Adjusting the Height

19" LCD Color Monitor HP L1940T
20
Panel Power Circuit
Replace PANEL
Measure Q403 base is
high level?
Check Q403 and Q402 are broken
or CN301 solder?
Check Correspondent
component.
OK
OK
NG
NG
Y301 oscillate waveforms are
normal
Replace U401
Replace Y301
OK
Replace U403
NG
NG