Sharp Aquos LC-20S1M, Service Manual

Page: 19 / 76

19
LC-20S1M
TROUBLE SHOOTING TABLE
(Continued)
Check all the settings on the microprocessor
s adjust process menu.
Are inputs and outputs of IC801 as specified?
Does the DPS test pattern appear? Does the video decoder test pattern appear?
Check IC3401, IC3402 and its peripheral parts.
Check IC1201, its peripheral circuits and the LCD panel. Check IC801 and its peripheral circuits.
Are inputs and outputs of IC3401, IC3402 as specified?
Check IC3401, IC3402 and its peripheral parts.
Is input at Pin (73) of IC801 as specified?
Check IC801, A
V1 line and
their peripheral parts.
Are inputs and outputs of Q1602, Q1604 and Q1606 as specified?
Check Q1602, Q1604, Q1606 and its peripheral parts.
Is output at pins (57)~(59) of IC1601 normal?
Check the R, G and B line.
Is input at pin (21) of IC1601 normal?
Check V2V0 line and its peripheral parts.
Check IC1601 and its peripheral parts.
Is input at Pins (1), (2), (3) and (75) of IC801 as specified?
Check J3402, DVD-Y
line,
PB line, PR line and peripheral parts.
Are voltages at Pins (6), (7) and (9) of tuner as specified?
Check the power line.
Is output at Pin (19) of tuner as specified?
Check the tuner and its peripheral parts.
Is input at Pin (5) of IC3402 as specified?
Check the line in question.
Check IC3402 and its peripheral parts.
Is Pin (4) of IC3402 at H?
Is Pin (48) of IC2001 at H?
Check the line in question.
Which S terminal input does not work?
Check SC3412, pin (1) of IC3401 and the related line.
Check SC341
1, pin
(16) of IC3401 and the related line.
Check input pins (72) and (73) of IC801, IC3401 and the related line.
S terminal for
A
V
1
S terminal for
A
V1 and
A
V
2
S terminal for A
V
2
No picture
No picture at all
No VIDEO 1 or 2 output
No TELE TEXT output
No S VIDEO output
No COMPONENT output
No TV output
Yes
No
Yes
No No
No
Yes
No
No
Yes
Yes
No
No
Yes
No
Yes
No
Yes
No No
Yes Yes
No
Yes