Sharp TU-GA1U-S - Watching TV (Continued); Adjusting Volume and Muting Sound

28
TU-GA1U-S
TU-GAD
TROUBLE SHOOTING TABLE (Continued)
No video output (2)
External input in trouble <Video 3>
Is Video 3 selected in the input switching
menu screen?
Are there digital video signal outputs at pins
(43), (44), (46), (47), (48), (49), (54), (55)
and (58) of IC400?
Are there digital video signal inputs at pins (51) thru (78) and (7) thru (10) of IC3201? (Signal pins only)
Are there digital video signal outputs at pins (39) thru (49) of IC3201? (Signal pins only)
Are there digital video signal outputs at pins (3) thru (16) of SC3200? (Signal pins only)
No problem up to the main PWB. Check TMDS PWB.
<Composite video signal input> Is there main video signal input at pin (60) of IC3800, or sub video signal input at pin (56)?
<S-video signal input> Are there main Y-signal input at pin (60) and main C-signal input at pin (59) of IC3800, or sub Y-signal
input at pin (56) and sub C-signal input at pin (55)?
<Composite video signal input> Is there main video signal input at pin (2) of IC401, or sub video signal input at pin (2) of IC
501?
<S-video signal input> Are there main Y-signal input at pin (2) and main C-signal input at pin (6) of IC401, or sub Y-signal in
put at pin (2) and sub C-signal input at pin (6) of IC501?
<S-video signal input>
Are there Y-signal input at pin (5) and
C-signal input at pin (7)?
<Composite video signal input>
Is there signal input at pin (3)?
Is there signal input at each input pin of
IC3800 (AV SWITCH)?
Select Video 3 and the input signal in the
input switching menu screen.
If signal name is in gray and not selectable
in the menu screen
Check between pins (2) of J2404 and pins
(3) of IC3800.
Check between pins (3) & (4) of J2401 and
pins (5) & (7) of IC3800.
Is composite video/S-video signals detection
functioning normally? Check between J2404
and pin (12) of IC1102, and between J2401
and pin (6) of IC3800.
Is there signal input at each input pin of
IC400 (MAIN VIDEO DEC)?
<Composite video signal input>
Is there signal input at pin (85)?
<S-video signal input>
Are there Y-signal input at pin (85) and C-
signal input at pin (90)?
Check IC 400 (MAIN VIDEO DEC) and its
peripheral circuits.
Check between IC401 and IC400.
Check between IC401 and IC400.
YES
YES
NO
NO
NO
NO
NO
Check between IC501 and IC500.
Check between IC501 and IC500.
NO
NO
NO
YES
YES
YES
YES
YES
Check IC3800 (AV SWITCH) and its
peripheral circuits.
NO
Check between IC3800 and IC401/IC501.
NO
YES
YES
<Composite video signal / S-video signal> input
<Main video signal>
Are there digital video signal outputs at pins
(43), (44), (46), (47), (48), (49), (54), (55)
and (58) of IC500?
Is there signal input at each input pin of
IC500 (SUB VIDEO DEC)?
<Composite video signal input>
Is there signal input at pin (85)?
<S-video signal input>
Are there Y-signal input at pin (85) and C-
signal input at pin (90)?
Check IC500 (SUB VIDEO DEC) and its
peripheral circuits.
Replace the main PWB, or check between
IC400/IC500 and IC3201.
NO
NO
Check IC3201 (LV DSTx) and its peripheral
circuits.
NO
Check between IC3201 and SC3200.
NO
<Sub video signal>