Sharp AQUOS LC-26GA5H, Service Manual

Page: 39 / 167

39
LC-26GA5H/M/X
TROUBLE SHOOTING TABLE
(Continued)
<VIDEO and S-VIDEO signal input>
No picture (1)
Exter
nal input picture do not appear
. (INPUT
-1)
Is INPUT
-1 selected on the input select men
u screen?
Are the signals coming to the input ter
m
inals on
IC3801 (A
V SWITCH)?
<VIDEO signal input> Are the main video signal and sub video signal outputted to pin (56) and pin (44) of IC3801, respectiv
ely?
<S-VIDEO signal input> Are the main
Y signal, main C signal, sub
Y signal and sub C signal outputted to pin (56), pin (58), pin
(44) and pin (48) of IC3801, respectiv
ely?
Chec
k the line betw
een IC401 and IC402.
Chec
k IC402 and its per
ipher
al circuits
.
Chec
k IC3801 (A
V SWITCH) and its per
ipher
al circuits
.
<VIDEO signal input> Is the video signal inputted to pin (8) of IC401 (MAIN L.P
.F
.) and pin (2) of IC600 (SUB L.P
.F
.)?
Chec
k the LCD control PWB
.
<S-VIDEO signal input> Are the main
Y signal and main C signal inputted to pins (8) and (11) of IC401, respectiv
ely? And are th
e sub
Y signal and sub C signal inputted to pins (2) and
(6) of IC600, respectiv
ely?
<VIDEO signal input> Is the video signal inputted to pin (8) of IC402 (MAIN 3D-YC & CHR
OMA)?
<S-VIDEO signal input> Are the
Y and C signals
inputted to pins (8) and (18) of IC402 (MAIN 3D-YC & CHR
OMA), respectiv
ely?
Is the digital video signal outputted from pins (124) thr
u
(133) as w
e
ll as (140) thr
u
(159) of IC402?
Is the digital video signal inputted to the f
o
llo
wing pins of IC3201 (L
VDS_TRANSMITTER):
(53), (54), (57) thr
u
(60), (51), (52)
(RE0-7);
(63) thr
u
(68), (61), (62)(GE0-7);
(73) thr
u
(78),
(69), (70)(BE0-7);
(81) thr
u
(86), (79), (80)(R
O0-7);
(91) thr
u
(96), (89), (90)(GO0-7);
(99), (100), (1), (2), (5), (6), (97),
(98)(BO0-7);
(7) thr
u
(10)(HSYNC
,
VSYNC
, DE, CLKIN)?
Replace the main PWB
, or chec
k the lines from IC402,
IC502 and IC601 up to IC3201.
Is the digital video signal inputted to the f
o
llo
wing pins of IC3201 (L
VDS_TRANSMITTER):
(53), (54), (57) thr
u
(60), (51), (52)
(RE0-7);
(63) thr
u
(68), (61), (62)(GE0-7);
(73) thr
u
(78),
(69), (70)(BE0-7);
(81) thr
u
(86), (79), (80)(R
O0-7);
(91) thr
u
(96), (89), (90)(GO0-7);
(99), (100), (1), (2), (5), (6), (97),
(98)(BO0-7);
(7) thr
u
(10)(HSYNC
,
VSYNC
, DE, CLKIN)?
Chec
k IC3201 (L
VDS_TRANSMITTER) and its
per
ipher
al circuits
.
<Main system> 3D-YC<P
ALNTSC>
Chec
k the lines from IC3801 up to IC401 and IC600.
YES
NO
YES
NO
YES
NO
YES
YES
NO
Chec
k the line betw
een IC401 and IC502.
Chec
k IC502 and its per
ipher
al circuits
.
<VIDEO signal input> Is the video signal inputted to pin (12) of IC502 (MAIN 2D-YC & CHR
OMA)?
<S-VIDEO signal input> Are the
Y and C signals
inputted to pins (12) and (16) of IC502 (MAIN 2D-YC & CHR
OMA), respectiv
ely?
Is the digital video signal outputted from pins (115) thr
u
(126) as w
e
ll as (133) thr
u
(144) of IC502?
<Main system> 2D-YC<SECAM>
NO
YES
YES
NO
Chec
k the line betw
een IC401 and IC601.
Chec
k IC601 and its per
ipher
al circuits
.
<VIDEO signal input> Is the video signal inputted to pin (72) of IC601 (SUB 2D-YC & CHR
OMA)?
<S-VIDEO signal input> Are the
Y and C signals
inputted to pins (72) and (71) of IC601 (MAIN 2D-YC & CHR
OMA), respectiv
ely?
Is the digital video signal outputted from pins (31) thr
u
(50) of IC601?
<Sub system>
NO
YES YES
YES
NO
NO NO NO NO
<VIDEO signal input> Is the video signal inputted to pin (1)?
<VIDEO signal input> Chec
k the line betw
een pin (8) of J1103
and pin (1) of IC3801.
Select INPUT
-1 on the input select
men
u screen f
o
r the signal to be f
ed.
Exter
nal input picture do not appear
. (INPUT
-2)
Is INPUT
-2 selected on the input select men
u screen?
Are the signals coming to the input ter
m
inals on
IC3801 (A
V SWITCH)?
YES
NO
YES
NO
YES YES
YES
YES
<VIDEO signal input> Is the video signal inputted to pin (8)? <S-VIDEO video signal input> Are the
Y and C signals inputted to pins (10) and (12),
respectiv
ely?
<VIDEO signal input> Chec
k the line betw
een pin (9) of J1105
and pin (8) of IC3801. <S-VIDEO signal input> Chec
k the lines betw
een pins (3)/(4) of
SC1101 and pins (10)/(12) of IC3801.
Select INPUT
-2 on the input select
men
u screen f
o
r the signal to be f
ed.
Exter
nal input picture do not appear
. (INPUT
-3)
Is INPUT
-3 selected on the input select men
u screen?
Are the signals coming to the input ter
m
inals on
IC3801 (A
V SWITCH)?
YES
NO
YES
NO
<VIDEO signal input> Is the video signal inputted to pin (15)?
<VIDEO signal input> Chec
k the line betw
een pin (9) of J1103
and pin (15) of IC3801. Select INPUT
-3 on the input select
men
u screen f
o
r the signal to be f
ed.