PG-MB60X (serv.man13). p33-43 Troubleshooting - Sharp Projector Service Manual (repair manual). Page 9

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?

Check the VIDEO-IN signal line 
of Q3104 and soldering of 
J3101.

Is input signal SECAM?

Check the peripheral circuits of 
IC3103 and color system 
malfunctions.

Are picture signals input to 
pins (39) and (41) of IC3103?

Do pulse-shaped waveforms appear 
at pins (15) and (16) of IC3105?

Check IC3105 and peripheral 
circuits.

Are picture signals output 
from pins (21), (22) and (23) 
of IC3103?

Do pulse-shaped waveforms appear 
at pins (13) and (14) of IC3103?

Check IC3103 and peripheral 
circuits.

Are picture signals input to 
pins (67), (68) and (68), and 
output from pins (35), (37) 
and (38) of IC3101?

Do pulse-shaped waveforms appear 
at pins (55) and (56) of IC3101?

Check IC3101 and peripheral 
circuits.

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.

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?

Check the soldering of J3101.