Acer P244W Service Manual page 52

4. Check Scalar
Scalar failed Scalar failed
Scalar failed Scalar failed
to output data to output data
to output data 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
Check the remaining Check the remaining
Check the remaining Check the remaining
Power or the ground pins Power or the ground pins Power or the ground pins Power or the ground pins
NO NO
NO NO
YES YES
YES YES
NO NO NO NO
Scalar ?
YES YES
YES YES
NO NO NO NO
YES YES YES YES
NO NO NO NO
correct?
YES YES YES YES
circuits circuits
circuits circuits
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has bad contacts has bad contacts
has bad contacts has bad contacts
Are the signals presented
on DSub connector?
YES YES
YES YES
Capacitors of Crystal Capacitors of Crystal Capacitors of Crystal Capacitors of Crystal
have damaged have damaged
have damaged have damaged
Scalar failed Scalar failed Scalar failed Scalar failed
DSUB Connector DSUB Connector
DSUB Connector DSUB Connector
NO NO NO NO
or PC failure or PC failure
or PC failure or PC failure
Bad wiring between Bad wiring between
Bad wiring between Bad wiring between
DSUB and Scalar DSUB and Scalar DSUB and Scalar DSUB and Scalar