Sharp AQUOS LC-26GA5H, Service Manual

Page: 40 / 167

40
LC-26GA5H/M/X
<COMPONENT signal input>
No picture (2)
Exter
nal input picture do not appear
. (INPUT
-1)
Are the main video signal, pass video signal and sub video signal outputted to pins (50)/(48)/(46)(Y
, Pb
, Pr), to pins (38)/(36
)/(34) (Y
, Pb
, Pr) and to pins (44)/ (42)/(40) (Y
, Pb
, Pr),
respectiv
ely
, of IC3805?
Is INPUT
-1 selected on the input select men
u screen?
Chec
k IC3805 (A
V SWITCH) and its per
ipher
al circuits
.
YES
NO
NO
Select INPUT
-1 on the input select
men
u screen f
o
r the signal to be f
ed.
Are the R, G and B signals coming to pins (59), (61) and (63) of IC3805 (A
V SWITCH)?
YES
NO
Chec
k the line betw
een pins (8)/(5)/(2) of
J1104 and pins (59)/(61)/(63) of IC3805.
YES
NO
Chec
k the line betw
een IC3805 and IC502.
Is the digital video signal outputted from pins (115) thr
u
(126) as w
e
ll as (133) thr
u
(144) of IC502?
YES
NO
Chec
k IC502 and its per
ipher
al circuits
.
Exter
nal input picture do not appear
. (INPUT
-3)
Is INPUT
-3 selected on the input select men
u screen?
YES
NO
Select INPUT
-3 on the input select
men
u screen f
o
r the signal to be f
ed.
Are the
Y
, Pb and Pr signals coming to pins (15), (17)
and (19) of IC3805 (A
V SWITCH)?
YES
NO
Chec
k the line betw
een pins (9)/(6)/(3) of
J1104 and pins (15)/(17)/(19) of IC3801.
YES
Is the main video signal inputted from pins (50)/(48)/ (46)(Y
, Pb
, Pr) of IC3805 to pins (24)/(29)/(32)
(Y
, Cb
, Cr) of IC502 (2D-YC & CHR
OMA)?
Is the main video signal inputted to pins (8)/(18)/(20) (Y
, Cb
, Cr) of IC402 (3D-YC & CHR
OMA)?
YES YES
NO
Chec
k the line betw
een IC3805 and IC401.
NO
Chec
k the line betw
een IC401 and IC402.
Is the digital video signal outputted from pins (124) thr
u
(133) as w
e
ll as (140) thr
u
(159) of IC402?
YES
NO
Chec
k IC402 and its per
ipher
al circuits
.
<Main system>
<Sub system>
<T
elete
x
t system>
YES
Is the video signal inputted from pins (38)/(36)/(34) (Y
, Pb
, Pr) of IC3805 to pins (9)/(12)/(14)(Y
, Pb
, Pr)
of IC401 (L.P
.F
.)?
Is the sub video signal inputted to pins (2)/(1)/(3) (Y
, Cb
, Cr) of IC601 (2D-YC & CHR
OMA)?
YES YES
NO
Chec
k the line betw
een IC3805 and IC600.
NO
Chec
k the line betw
een IC600 and IC601.
Is the digital video signal outputted from pins (31) thr
u
(50) of IC601?
YES
NO
Chec
k IC601 and its per
ipher
al circuits
.
YES
Is the video signal inputted from pins (44)/(42)/(40) (Y
, Pb
, Pr) of IC3805 to pins (8)/(10)/(13)(Y
, Pb
, Pr)
of IC600 (L.P
.F
.)?
Chec
k the LCD control PWB
.
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 outputted to the f
o
llo
wing pins of IC3201:
(49)(T
A1-), (48)(T
Al+), (47)(TB1-), (46)(TBl+), (44)(TC1
-), (43)(TCl+), (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+)?
Chec
k IC3201 (L
VDS_TRANSMITTER) and its
per
ipher
al circuits
.
YES YES
NO NO
TROUBLE SHOOTING TABLE
(Continued)