Sharp TU-GA1U-S - Watching TV (Continued); Setting MTS;SAP Stereo Mode

29
TU-GA1U-S
TU-GAD
TROUBLE SHOOTING TABLE (Continued)
No video output (3)
Tuner-A (U/V) in trouble
Is there video signal output at pin (17) of
TU1101(video output)?
Is there signal input at pin (7) of IC1103?
Is there signal output at pin (5) of IC1103?
Is there signal input at pin (17) of IC3800
(AV SWITCH)?
Check the tuner and its peripheral circuits.
Check between the tuner and IC1103.
Check IC1103 and its peripheral circuits.
Check between IC1103 and IC3800.
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)
Is there main video signal output at pin (60) of IC3800, or sub video signal output at pin (56)?
Is there main video signal input at pin (2) of IC401, or sub video signal input at pin (2) of IC501?
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.
Is there signal input at each input pin of
IC400 (MAIN VIDEO DEC)?
<Component video Signal Input>
Is there signal input at pin (85)?
Check between IC401 and IC400.
Check IC400 (MAIN VIDEO DEC) and its
peripheral circuits.
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
Tuner-B (U/V) in trouble
Is there video signal output at (video output)
pin (17) of TU1102?
Is there signal input at pin (1) of IC1103?
Is there signal output at pin (3) of IC1103?
Is there signal input at pin (19) of IC3800
(AV SWITCH)?
Check the tuner and its peripheral circuits.
Check between the tuner and IC1103.
Check IC1103 and its peripheral circuits.
Check between IC1103 and IC3800.
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
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)?
<Component video Signal Input>
Is there signal input at pin (85)?
Check between IC501 and IC500.
Check IC500 (SUB VIDEO DEC) and its
peripheral circuits.
NO
NO
YES
YES
Check IC3800 (AV SWITCH) and its
peripheral circuits.
NO
Check between IC3800 and IC401/IC501.
NO
<Tuner U/V> input
<Main video signal>
Replace the main PWB, or check between
IC400/IC500 and IC3201.
NO
Check IC3201 (LV DSTx) and its peripheral
circuits.
NO
Check between IC3201 and SC3200.
NO
<Sub video signal>