Sharp PG-M20S Service Anleitung Seite 33

Checking of Low-pass Filter Circuit
Is video signal is inputted to pins
(4), (8) and (12) of IC3851?
Yes
Is video signal inputted to pins
(24), (21) and (17) of IC3851?
Yes
Is video signal is inputted to pins
(16), (20) and (24) of IC3001?
Yes
The low-pass filter circuit on the
input PWB is normal. Does the
picture appear?
Yes
End
No
Check pins (4), (8) and (12) of
SC3001.
Normal
Check Q3854 and
Q3855.
IC3851 is defective.
No
If the picture quality is abnormal, check whether
or not the following voltages are outputted to
pin (28) of IC3851.
0.3 V for 480i, 1 V for 720p, 1080i, Check IC301.
No
Check Q3851, Q3852 and Q3853
and their periphery.
Is the video signal inputted to pins
No
(8), (17) and (23) of IC8013
(AD9888) of the PC I/F unit?
Yes
Check the SOG
circuit or IC8013
and its periphery.
33
Abnormal
Check the PC I/F unit.
Check DVI (analog)
input.
No
Check IC8013
and its periphery.
PG-M20S
PG-M20X