Read Sharp LC-26GA3 (serv.man8) Service Manual online
36
LC-26GA3E
TROUBLE SHOOTING TABLE
(Continued)
YES
YES
YES
YES
YES
NO
NO
YES
YES
NO
NO
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
YES
YES
NO
NO
YES
YES
<LC-26GA3/4E>
No video output (1)
<CVBS,
Y/C, S-video signal> input
External input image does not appear
.
(INPUT
-1)
Is INPUT
-1 selected on the input switching
menu screen?
Select INPUT
-1 on the input
switching menu screen and
then select the input signal.
<CVBS signal input>
Check between pin (20) of
SC1
101 and pin (1) of IC3801.
Is signal supplied to each input terminal of
IC3801 (A
V SWITCH)?
<CVBS signal input>
Is image signal supplied to pin (1)?
Is INPUT
-2 selected on the input switching
menu screen?
Select INPUT
-2 on the input
switching menu screen and
then select the input signal.
<CVBS signal input>
Check between pin (20) of
SC1
102 and pin (8) of IC3801.
<Y/C signal input>
Check between pin (20,15) of
SC1
102 and pin (10,12) of
IC3801.
Is signal supplied to each input terminal of
IC3801 (A
V SWITCH)?
<CVBS signal input>
Is image signal supplied to pin (8)?
<Y/C video signal input>
Are
Y
and C supplied to pins (10) and (12).
Check IC3801 (A
V SWITCH) and the
peripheral circuits.
Is digital image signal sent from pins (124)-
(133) and (140)-(159) of IC402?
Are there digital video signal inputs at pins (53), (54), (57)~(60), (51), (52) (RE0-7), pins(63)~(68), (61), (62) (GE0-7), pin
s (73)~(78), (69), (70)
(BE0-7), pins (81)~(86), (79), (80) (RO0-7), pins (91)~(96), (89), (90) (GO0-7), pins (99), (100), (1), (2), (5), (6), (97), (9
8) (BO0-7), and pins
(7)~(10) (HSYNC, VSYNC, DE, CLKIN) of IC3201 (L
VDS
TRANSMITTER)?
Are there digital video signal outputs at pins (49)(T
A1—), (48)(T
A1+), (47)(TB1—), (46)(TB1+), (44)(TC1—), (43)(TC1+),(41)(TCLK
—),
(42)(TCLK+), (40)(TD1—), (39)(TD1+), (37)(T
A2—), (36)(T
A2+), (35)(TB2—), (34)(TB2+), (32)(TC2—), (31)(TC2+), (30)(TCLK2—),(29)(
TCLK2+),
(28)(TD2—), and (27)(TD2+) of IC3201?
<CVBS, VIDEO signal input>
Are MAIN image signal and SUB image signal supplied to pins (56) and (44) of IC3801, respectively?
<Y/C, S-VIDEO signal input>
Are MAIN-Y
signal, MAIN-C signal, SUB-Y
signal and SUB-C signal supplied to pins (56),(58),(44) and
(47) of IC3801, respectively?
<CVBS, VIDEO signal input> Is image signal supplied to pin 8 of IC401 (MAIN L.P
.F
.) and pin (2) of IC600 (SUB L.P
.F
.)?
<Y/C, S-VIDEO signal input>
Are MAIN-Y
signal, MAIN-C signal, SUB-Y
signal and SUB-C signal supplied to pins (8) and (1
1) of IC
401 and pins (2) and (6) of
IC600, respectively?
External input image does not appear
.
(INPUT
-2)
Is INPUT
-3 selected on the input switching
menu screen?
Select INPUT
-3 on the input
switching menu screen and
then select the input signal.
<VIDEO signal input>
Check between pin (8) of J1
101
and pin (15) of IC3801.
<S-video signal input>
Check between pin (3,4) of
SC1
103 and pin (17,19) of
IC3801.
Is signal supplied to each input terminal of
IC3801 (A
V SWITCH)?
<VIDEO signal input>
Is image signal supplied to pin (15)?
<S-video signal input>
Are
Y
and C supplied to pins (17) and (19).
External input image does not appear
.
(INPUT
-3)
Check between IC3801 and IC401/IC600.
<CVBS, VIDEO signal input>
Is image signal supplied to pin (8) of IC402
(MAIN 3D-YC & CHROMA)?
<Y/C, S-VIDEO signal input>
Are
Y
and C supplied to pins (8) and (18) of
IC402 (MAIN 3D-YC & CHROMA),
<MAIN VIDEO>
3D-YC<P
AL>
Check between IC401 and IC402.
Check IC 402 and the peripheral
circuits.
Is digital image signal sent from pins (1
15)-
(126) and (133)-(144) of IC502?
<CVBS, VIDEO signal input>
Is image signal supplied to pin (12) of IC502
(MAIN 2D-YC & CHROMA)?
<Y/C, S-VIDEO signal input>
Are
Y
and C supplied to pins (12) and (16) of
IC502 (MAIN 2D-YC & CHROMA),
<MAIN VIDEO>
2D-YC<SECAM>
Check between IC401 and IC502.
Check IC 502 and the peripheral
circuits.
Is digital image signal sent from pins (31)-
(40) and (41)-(50) of IC601?
<CVBS, VIDEO signal input>
Is image signal supplied to pin (72) of IC601
(SUB 2D-YC & CHROMA)?
<Y/C, S-VIDEO signal input>
Are
Y
and C supplied to pins (72) and (71) of
IC601 (SUB 2D-YC & CHROMA),
<SUB VIDEO>
Check between IC401 and IC601.
Check IC 601 and the peripheral
circuits.
Replace the main PWB, or check between
IC402/IC502/601 and IC3201.
Check IC3201 (L
VDS
TRANSMITTER) and
the peripheral circuits.
Check the LCD CONTROLLER PWB.
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