Elo TouchSystems ET1587C - 5. During mode change, there is a noise picture appear on screen

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4. The CS signal from monitor is not working properly
Check the power circuit
No
Check
U101
Pin 5=5V
Yes
END
Check
again if pin 34,35,
36,37 working normally?
(reference to
table)
Yes
OK
No
Check
if pin 33 (H.sync)
to U101 is normal?(It mean
the value of frequency is correct and
the high low level is
correct too)
Check
if pin 32 (V.sync) to
U101 is normal?(It mean the
value of frequency is correct
and the high low level
is correct too)
Change CPU
END
Check the H.sync and the
component around it
Check the V. sync and the
component around it
No
No
Yes
Yes
END