Sharp VC-G20SM Serviceanleitung Seite 45

FLOW CHART NO.18 E-E MODE TROUBLESHOOTING
No picture E-E signal.
NO
Is there picture signal inputted
Check line between rear video input terminal and pin (31) of IC201.
in the pin (31) of IC201?
YES
Is there a picture signal Is the supply voltage of 5V
NO
outputted in the pin(52) of (Y-Vcc) fed to pin(12) of
IC201? IC201?
YES
Is there Y/C serial data and
Y/C clock signal applied to
pins(63) and (62) of IC201?
Replace IC201.
Is there a picture signal
Check the line between pin
NO
outputted in the emitter of
(52) of IC201 and Q201
Q201?
YES
Is there a picture signal Check the line between pin
NO
inputted in the pin(49) of (52) of IC201 and pin (49)
IC701? of IC701
YES
Is the supply voltage of 5V
Is there a picture signal
NO
(OSD Vcc) fed to pin (51)
outputted in the pin(47) of
of IC701?
IC701?
YES
Is there a picture signal
NO Check peripheral circuit of
outputted in the emitter of
Q251.
Q251?
YES
NO
Check PC 5V line.
YES
Check line between pins(63),
NO
(62) of IC201 and pins(84),
(85) of IC701.
YES
NO
Check PC 5V line.
Is there a picture signal
Check peripheral circuit of
NO
outputted at pin(25) ofIC2501?
IC2501.
YES
Check the line between IC2501
peripheral and output terminal
periphery.