Download Sharp LC-20S4US Operation Service manual

Check IC7001 and its peripheral
circuits.
No
Is the output at pin (88) of IC7001
as specified?
No
Is the input at pin (31) of IC801 as
specified?
No TV Color
Yes
Yes
No S Video Color
Check the line between pin (88) of
IC7001 and pin (31) of IC801.
Check the output of IC801 and its
peripheral circuits.
Check the line between pin (4) of
J3401 and pin (16) of IC3406.
No
Is the input at pin (16) of IC3406
as specified?
Yes
Check the line between pin (6) of
J3401 and pin (24) of IC2001 as
well as the line between pin (49) of
IC2001 and pin (2) of IC3406.
Make sure the microprocessor's adjustment process menu settings are as specified.
No Video Color
No Color
Check the Cb and Cr lines of
SC2001 and its peripheral circuits.
No
Are the Inputs at pins (21) and (33) of
IC801 as specified?
No Component Color
LC-20S4U-S
TROUBLE SHOOTING TABLE (Continued)
31