Compaq W19Q Service Manual page 28

19" LCD Color Monitor
4. U401-Data Output
Measured X301 waveform is
normal?
Check GM5726 (U401)
Signal output (PIN31-40, 7-16) Is the waveform ok?
Check HS/VS input signal are normal?
OK
NG
OK
Replace U401
NG
Replace X301(14.318MHz)
OK
Check relative circuit to panel
NG
Check relative component
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COMPAQ W19Q