Sharp PG-M20XU Service Manual page 42

PG-M20S
PG-M20X
» PC I/F Unit-6/12
Checking of R, G and B Signals
Is the signal type set to RGB?
Yes
Set the process mode.
Select R, G and B individually on
the pattern menu.
Go to "Checking of GA4 and Its
Periphery".
For checking the input signal,
set the signal generator to
gradation signal.
Check TL8169, TL8170 and
TL8180 by oscilloscope.
(MSB bit after A/D conversion)
Are there the specified signals at
TL8169, TL8170 and TL8180?
Yes
IC8025 and its periphery are
defective.
No
Set the signal type to RGB.
No
Does the signal come to C8062,
C8070 and C8078?
IC8013 and its periphery are
defective.
42
No
Yes
Go to "Confirmation of
Video Input".