LC-20SH6U
29
TROUBLESHOOTING TABLE
(Continued)
No TV output
No TV, video 1 and 2 output
No video output at all
No component output
No S video output
No video 2 output
No video 1 output
Make sure the microprocessor's adjustment process menu settings are as specified.
Yes
No
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Are the input and output of IC801 as specified?
Check IC801 and its peripheral circuits.
Check the LCD panel voltage and waveform.
Are the input and output of IC3402 as specified?
Check IC3402 and its peripheral circuits.
Check the line in question.
Are the voltages at pins (3), (9) and (15) of tuner as specified?
Is the output at pin (17) of tuner as specified?
Is the input at pin (5) of IC3402 as specified?
Is the output of IC3402 as specified?
Check the line in question.
Check IC3402 and its peripheral circuits.
Check the line in question.
Check the tuner and its peripheral circuits.
Check the power line.
Is the input at pin (1) of IC3402 as specified?
Is the output of IC3402 as specified?
Check the line in question.
Check the line in question.
Check IC3402 and its peripheral circuits.
Is the input at pin (3) of IC3402 as specified?
Is the output of IC3402 as specified?
Check the line in question.
Check the line in question.
Check IC3402 and its peripheral circuits.
No
Yes
No
Yes
Is the input at pin (24) of S terminal detector IC2001 as specified?
Are the inputs at pins (31) and (42) pf IC801 as specified?
Check the related line.
Check the related line.
Check IC801 and its peripheral circuits.
No video output
Are the inputs at pins (21), (33) and (44) of IC801 as specified?
Check the D-Y, D-Pb and D-Pr lines of J3405.