Sharp TU-45GAD, Service Manual

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TU-GD10U-T
TU-45GAD/T
LC-45GX6U/D/T
TROUBLE SHOOTING TABLE
(Continued)
YES YES YES YES YES
NO NO NO
YES YES
NO NO NO
NO NO
NO NO
NO
YES YES YES
NO NO
YES
NO
<SUB VIDEO>
External input in trouble <VIDEO2>
Is VIDEO2 selected in the input switching menu screen?
Is there signal input at each input pin of IC3800 (A
V SWITCH)?
<Composite video signal input> Is there signal input at pin (8)? <S-video signal input> Are there
Y
-signal input at pin (10) and
C-signal input at pin (12)?
Select VIDEO2 and the input signal in the input switching menu screen. If signal name is gray and not selectable in the menu screen
Check between pin (9) of J1
105 and pin
(8) of IC3800. Check between pins (9), (10) of SC1
101
and pins (10), (12) of IC3800.
External input in trouble <VIDEO3>
Is VIDEO3 selected in the input switching menu screen?
Is there signal input at each input pin of IC3800 (A
V SWITCH)?
<Composite video signal input> Is there signal input at pin (22)? <S-video signal input> Are there
Y
-signal input at pin (24) and
C-signal input at pin (26)?
Select VIDEO 3 and the input signal in the input switching menu screen. If signal name is gray and not selectable in the menu screen
Is composite video signal /S-video signal detection functioning normally? Check between J2404 and pin (12) of IC1
102.
Check between J2401 and pin (28) of IC3800.
Check between pin (2) of J2404 and pin (22) of IC3800. Check between pins (3), (4) of J2401 and pins (24), (26) of IC3800.
<Composite video signal / S-video signal> input
<Composite video signal input>
Are there MAIN VIDEO signal output at pin (56) of IC3800 and SUB VIDEO signal output at pin (44)
?
<S-video signal input>
Are there MAIN
Y-signal output at pin (56) and MAIN C-signal output at pin (58) of IC3800, and SUB
Y-sig
nal output at pin (44) and SUB C-signal output at pin (47)?
<Composite video signal input>
Are there MAIN VIDEO signal input at pin (2) of IC402 and SUB VIDEO signal output at pin (2) of
IC501?
<S-video signal input>
Are there MAIN
Y-signal input at pin (2) and MAIN C-signal input at pin (6) of IC402, and SUB
Y-signal i
nput at pin (2) and SUB C-signal input at pin (6) of IC501?
<MAIN VIDEO>
Check between IC402 and IC403.
<Composite video signal input> Is there video signal input at pin (135) of IC403 (MAIN VIDEO DEC)? <S-video signal input> Are there
Y
-signal input at pin (135) and C-
signal input at pin (149) of IC403 (MAIN VIDEO DEC)?
Are there digital video signal outputs at pins (56)~(69) and (92)~(106) of IC403?
Check IC403 (MAIN VIDEO DEC) and the peripheral circuits.
No video output (2)
Check IC3800 (A
V SWITCH) and the
peripheral circuits. Check between IC3800 and IC402/IC501.
<Composite video signal input> Is there video signal input at pin (135) of IC502 (SUB VIDEO DEC)? <S-video signal input> Are there
Y
-signal input at pin (135) and C-
signal input at pin (149) of IC502 (SUB VIDEO DEC)?
Check between IC501 and IC502.
Are there digital video signal outputs at pins (56)~(69) and (92)~(106) of IC502?
Check IC502 (SUB VIDEO DEC) and the peripheral circuits.
Is composite video signal /S-video signal detection functioning normally? Check between J1
105 and pin (10) of IC1
102.
Check between SC1
101 and pin (14) of
IC3800.
YES
NO NO
YES
NO
YES
Is the digital video signal input to pins (51) to (100) and pins (1) to (10) of IC3201? (Check the signal terminals only
.)
Is the digital video signal output from pins (39) to (49) of IC3201? (Check the signal terminals only
.)
Replace the main PWB, or check between IC403/IC502 and IC3201. Check IC3201 (L
VDS
Tx) and the
peripheral circuits.
Is the digital video signal output from pins (3) to (16) of SC3200? (Check the signal terminals only
.)
Check between IC3201 and SC3200.
No abnormality is found up to main PWB. Check the
TMDS PWB.