Acer G225HQ Service Manual page 52

3 Check Scalar
Scalar failed
to output data
Are all the power and
ground pins at the correct
voltage level?
Are the correct RGB and
Hsync signal fed to
Is the correct Sinusoidal
wave appeared on Crystal
Measure the signal pairs
on LVDS data output and
clock from Scalar
Are the pixel output
correct?
Check the remaining
circuits
Power or the ground pins
NO
YES
Are the signals presented
NO
Scalar ?
YES
NO
YES
NO
YES
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has bad contacts
NO
on DSub connector?
YES
Capacitors of Crystal
have damaged
Scalar failed
DSUB Connector or
PC failure
Bad wiring between
DSUB and Scalar