Acer P244W, Service Manual

Page: 52 / 67

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