Sharp XG-MB70X Serviceanleitung Seite 41

Checking of Video input
Send composite VIDEO
signals to INPUT3. Use keys
on the main unit or remote
control to select INPUT3.
Is picture signal input to pin
(1) of IC3103?
YES
Is input signal SECAM?
NO
Are picture signals input to
pins (39) and (41) of IC3103?
YES
2
Are picture signals output
from pins (21), (22) and (23)
of IC3103?
YES
Are picture signals input to
pins (67), (68) and (68), and
output from pins (35), (37)
and (38) of IC3101?
YES
1
Checking of
S-Video input
Send S terminal (Y and C) signals to INPUT4.
Use keys on the main unit or remote control to
select INPUT4.
Are picture signals output from pins (43) and
(44) of IC3103?
YES
2
NO
Check the VIDEO-IN signal line
of Q3104 and soldering of
J3101.
YES
Check the peripheral circuits of
C3103 and color system
malfunctions.
NO
Do pulse-shaped waveforms appear
at pins (15) and (16) of IC3105?
Check IC3105 and peripheral
circuits.
NO
Do pulse-shaped waveforms appear
at pins (13) and (14) of IC3103?
Check IC3103 and peripheral
circuits.
NO
Do pulse-shaped waveforms appear
at pins (55) and (56) of IC3101?
Check IC3101 and peripheral
circuits.
NO
41
NO
YES
NO
YES
NO
YES
Check the soldering of J3101.
XG-MB70X
The I2C bus line does
not function normally.
Check IC2201, IC2003,
IC2005, IC2006, IC2007
and their peripheral
circuits.
Check if IC connected to
I2CBUS functions
normally.