Sharp TU-37GD1E (serv.man8) Service Manual ▷ View online
37
TU-32GD1E
TU-37GD1E
TU-37GD1E
TROUBLE SHOOTING TABLE
(Continued)
No audio output (3) (On the reception of
TV br
oadcasting,
audio fr
om the SCAR
T terminal to the e
xternal de
vice)
No audio output (4) (A
udio fr
om e
xternal input terminals)
YES
NO
NO
YES
YES
No audio output from INPUT1
T
e
rminal.
No audio output from INPUT2 and
INPUT3 T
e
rminals
.
YES
Is output from Pins (27)(28) of
IC2501 (MSP) nor
mal?
Confir
m Pins (23)(27) of SC1102
thr
u Pins (16)(18) of IC3801.
Confir
m Pins (5)(7) of J2404 thr
u
Pins (23)(25) of IC3801.
Is the A
UDIO input signal to Pins
(56)(57) of IC2501 (MSP) nor
mal?
Chec
k output of Pins (33)(34) of
IC2501 (MSP) and per
ipher
al
circuits
.
Confir
m Pins (2)(6) of SC1102
thr
u Pins (9)(11) of IC3801.
Confir
m Pins (2)(6) of SC1101
thr
u Pins (2)(4) of IC3801.
Chec
k the D
VI-L/R signal betw
een
INPUT5-D
V1-A
UDIO-T
er
minal
(J1900) and AD-Connector
.
YES
Chec
k the signal of Pins (27)(28)
of IC2501 thr
u Pins (1)(3) of
SCAR
T2 (SC1102) and Pins
(22)(24) of SCAR
T3 (SC1102).
Q1105, Q1106, Q1110, Q1111
Chec
k Q1104, Q1107, Q1109 and
Q1112 of the A
udio-Mute circuit
and S-MUTE-LINE.
YES
Is output from Pins (24)(25) of
IC2501 (MSP) nor
mal?
YES
Chec
k the signal of Pins (24)(25)
of IC2501 thr
u Pins (1)(3) of
SCAR
T1 (SC1101).
Chec
k Q1101 and Q1102 of the
A
udio-Mute circuit and S-MUTE-
LINE.
No audio signals input from
INPUT1 thr
u INPUT4
T
e
rminals
.
YES
Is the signal input from each
ter
minal to IC3801 (A
V
-SW)
nor
mal?
<INPUT1>
Is the input signal (SL1/SR1) to
Pins (2)(4) of IC3801 (A
V
-SW)
nor
mal?
<INPUT2>
Is the input signal (SL2/SR2) to
Pins (9)(11) of IC3801 (A
V
-SW)
nor
mal?
<INPUT3>
Is the input signal (SL3/SR3) to
Pins (16)(18) of IC3801 (A
V
-SW)
nor
mal?
YES
<INPUT4>
Is the input signal (V4L/V4R) to
Pins (23)(25) of IC3801 (A
V
-SW)
nor
mal?
NO
Is the A
UDIO output signal (MAIN-
L/R) from Pins (52)(54) of IC3801
(A
V
-SW) nor
mal?
Replace IC3801 (A
V
-SW) and
chec
k per
ipher
al circuits
.
Replace IC3801 (A
V
-SW) and
chec
k per
ipher
al circuits
.
No audio signals input from the
INPUT5 D
VI-A
UDIO
T
e
rminal.
YES
<INPUT5>
Is the input signal (PC-L/R) to Pins
(29)(31) of IC3801 nor
mal?
NO
Is the A
UDIO output signal (MAIN-
L/R) from Pins (52)(54) of IC3801
(A
V
-SW) nor
mal?
38
TU-32GD1E
TU-37GD1E
TU-37GD1E
TROUBLE SHOOTING TABLE
(Continued)
No video output (1)
No INPUT1 output of the e
xter
nal input
system.
Is "INPUT1" selected with the "INPUT
SOURCE" b
utton of the remote controller?
Chec
k Pin (20) of SCAR
T1 (SC1101) thr
u
Pins (1)(3) of IC3801.
Select "INPUT1" with the "INPUT
SOURCE" b
utton of the remote controller
,
select Option-Input Select in the MENU
panel, and then select Signal
T
ype of the
input signal.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Is the Composite
Video signal (CVS1) input
to input ter
minals Pins (1)(3) of IC3801 (A
V
-
SW)?
No INPUT2 output of the e
xter
nal input
system.
Is "INPUT2" selected with the "INPUT
SOURCE" b
utton of the remote controller?
Select "INPUT2" with the "INPUT SOURCE"
b
utton of the remote controller
, select
Option-Input Select in the MENU panel, and
then select Signal
T
ype of the input signal.
Chec
k Pin (20) of SCAR
T2 (SC1102) thr
u
Pins (8)(10) of IC3801.
Chec
k IC3801 (A
V
-SW) and per
ipher
al
circuits
.
Chec
k IC3801 (A
V
-SW) thr
u IC401/IC600.
Chec
k IC600 (LPF) thr
u IC601 (VPC).
Chec
k IC402 (3D-YC), IC502 (2D-YC) and
IC601 (VPC) thr
u IC3201 (L
VDS_TX), or
replace the main PWB
.
Chec
k IC3201 (L
VDS_TX) and per
ipher
al
circuits
.
Chec
k IC3201 thr
u SC3200.
YES
YES
YES
YES
Is the Composite
Video signal (CVS2) input
to input ter
minals Pins (8)(10) of IC3801 (A
V
-
SW)?
<On input of the Composite
Video signal>
Are MAIN-Video signal and SUB-Video signal output to Pins (56) and (44) of IC3801 (A
V
-SW) respectiv
ely?
<On input of the Composite
Video signal>
Are MAIN-Video signal and SUB-Video signal input to Pin (8) of IC401 (LPF) and Pin (2) of IC600 (LPF) respectiv
ely?
Is the
VIDEO signal input to input ter
minals
of Pin (8) of IC402 (3D-YC) and Pin (16) of
IC502 (2D-YC)?
(MAIN Video
System)
Is the digital video signal output from Pins
(124) thr
u (133) of IC402 and Pins (115) thr
u
(126) of IC502?
Are the digital video signal and H/V
-SYNC signal input to Pins (51) thr
u (78) and Pins (7) thr
u (10) of IC3201 (L
VDS_TX) respec
tiv
ely?
Is the digital video signal output to Pins (39) thr
u (49) of IC3201 (L
VDS_TX)?
Is the digital video signal output to Pins (3) thr
u (15) of L
V
Connector SC3200?
No prob
lem in the MAIN PWB
. Chec
k the
TMDS PWB
.
Is the input/output signal of Pins (9) thr
u (20) of IC3105 ~ Pins (21) thr
u (31) of IC3101 in the
TMDS PWB nor
mal?
Are the Connector SC3102 of DISPLA
Y_OUTPUT1 and the SYSTEM_CABLE nor
mal?
Chec
k the LCD_DISPLA
Y par
t.
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Chec
k IC401 (LPF) thr
u IC402 (3D-
YC)/IC502 (2D-YC).
NO
Chec
k IC402 (3D-YC), IC502 (2D-YC) and
per
ipher
al circuits
.
NO
YES
YES
Is the
VIDEO signal input to the input
ter
minal Pin (72) of IC601 (VPC)?
(SUB Video
System)
Is the digital video signal output from Pins
(41) thr
u (50) of IC601?
Chec
k IC601 (VPC) and per
ipher
al circuits
.
Chec
k the input/output signal of
IC3105/IC3101 in the
TMDS PWB and
per
ipher
al circuits
.
Chec
k the Connector SC3102 of
DISPLA
Y_OUTPUT1 and the
SYSTEM_CABLE.
39
TU-32GD1E
TU-37GD1E
TU-37GD1E
TROUBLE SHOOTING TABLE
(Continued)
No video output (2)
No INPUT3 output of the e
xter
nal input
system.
<On input of the Composite
Video signal and COMPONENT>
Is "INPUT3" selected with the "INPUT
SOURCE" b
utton of the remote controller?
Chec
k Pin (41) of INPUT3 (SC1102) thr
u
Pins (15)(17) of IC3801.
Chec
k Pins (3)(8)(12) of the INPUT3-
COMPONENT ter
minal thr
u Pins
(15)(17)(19) of IC3805.
Select "INPUT3" with the "INPUT
SOURCE" b
utton of the remote controller
,
select Option-Input Select in the MENU
panel, and then select Signal
T
ype of the
input signal.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Is the Composite
Video signal (CVS3) input
to input ter
minals Pins (15)(17) of IC3801
(A
V
-SW)?
<COMPONENT
Video signal input>
Is the
Y/PB/PR signal input to Pins
(15)(17)(19) of IC3805?
No INPUT4 output of the e
xter
nal input
system.
Is "INPUT4" selected with the "INPUT
SOURCE" b
utton of the remote controller?
Select "INPUT4" with the "INPUT SOURCE"
b
utton of the remote controller
, select
Option-Input Select in the MENU panel, and
then select Signal
T
ype of the input signal.
Chec
k IC3801 (A
V
-SW) and per
ipher
al
circuits
.
Chec
k IC3801 (A
V
-SW) thr
u IC401/IC600.
Chec
k IC600 (LPF) thr
u IC601 (VPC).
Chec
k IC402 (3D-YC), IC502 (2D-YC) and
IC601 (VPC) thr
u IC3201 (L
VDS_TX), or
replace the main PWB
.
Chec
k IC3201 (L
VDS_TX) and per
ipher
al
circuits
.
Chec
k IC3201 thr
u SC3200.
YES
YES
YES
YES
<On input of the Composite
Video signal> Are the MAIN
Video signal and the SUB
Video signal output to Pin (56) and Pin (44) of
IC3801 (A
V
-SW) respectiv
ely?
<On input of the S-Video signal> Are the MAIN-Y and MAIN-C signal output to Pin (56) and Pin (58) of IC3801 (A
V-SW) respectiv
el
y,
and are the SUB-Y and SUB-C signal output Pin (44) and Pin (47) respectiv
ely?
<On input of the Composite
Video signal> Are the MAIN
Video signal and the SUB
Video signal input to Pin (8) of IC401 (LPF) and
Pin (2) of IC600 (LPF) respectiv
ely?
<On input of the S-Video signal> Are the MAIN-Y and MAIN-C signal input to Pin (8) and Pin (11) of IC401 (LPF) respectiv
ely
, an
d are the SUB-Y and SUB-C signal input Pin (2) and Pin (6) of IC600 (LPF) respectiv
ely?
Is the
VIDEO signal input to the input ter
minals of Pin
(8) of IC402 (3D-YC) and Pin (16) of IC502 (2D-YC)?
<On input of the S-Video signal> Are the
Y and C
signal input to Pin (8) and Pin (18) of IC402
respectiv
ely
, and are the
Y and C signal input to Pin
(16) and Pin (12) of IC502 respectiv
ely?
(MAIN Video
System)
Is the digital video signal output from Pins
(124) thr
u (133) of IC402 and Pins (115) thr
u
(126) of IC502?
Are the digital video signal and the H/V
-SYNC signal input to Pins (51) thr
u (78) and Pins (7) thr
u (10) of IC3201 (L
VDS_TX) re
spectiv
ely?
Is the digital video signal output to Pins (39) thr
u (49) of IC3201 (L
VDS_TX)?
Is the digital video signal output to Pins (3) thr
u (15) of the L
V
Connector SC3200?
No prob
lem in the MAIN PWB
. Chec
k the
TMDS PWB
.
Is the input/output signal of Pins (9) thr
u (20) of IC3105 ~ Pins (21) thr
u (31) of IC3101 in the
TMDS PWB nor
mal?
Are the Connector SC3102 of DISPLA
Y_OUTPUT1 and SYSTEM_CABLE nor
mal?
Chec
k the LCD_DISPLA
Y par
t.
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Chec
k INPUT4 and Pin (2) of RCA pin
(J2404) thr
u Pin (22) of IC3801.
Chec
k INPUT4 and Pins (3)(4) of the S-
T
e
rminal (J2401) thr
u the input ter
minal
Pins (24)(26)(28) of IC3801 (A
V
-SW).
Is the
Video signal (V4-V) input to the input
ter
minal Pin (22) of IC3801 (A
V
-SW)?
<S-Video signal input>
Is the
Y/C signal input to the input ter
minal
Pins (24)(26)(28) of IC3801 (A
V
-SW)?
NO
NO
Chec
k IC401 (LPF) thr
u IC402 (3D-
YC)/IC502 (2D-YC).
NO
Chec
k IC402 (3D-YC), IC502 (2D-YC) and
per
ipher
al circuits
.
NO
YES
YES
Is the
VIDEO signal input to the input
ter
minal Pin (72) of IC601 (VPC)?
<On input of the S-Video signal> Are the
Y
and C signal input to Pin (72) and Pin (71) of
IC601 respectiv
ely?
(SUB Video
System)
Is the digital video signal output from Pins
(41) thr
u (50) of IC601?
Chec
k IC601 (VPC) and per
ipher
al circuits
.
Chec
k the input/output signal of
IC3105/IC3101 in the
TMDS PWB and
per
ipher
al circuits
.
Chec
k the Connector SC3102 of
DISPLA
Y_OUTPUT1 and SYSTEM_CABLE.
40
TU-32GD1E
TU-37GD1E
TU-37GD1E
TROUBLE SHOOTING TABLE
(Continued)
(MAIN V
ideo System)
(S
UB
V
ideo System)
No video output (3)
Set
-up
C
o
nf
ir
m
a
tio
n
:
1
) A
re t
h
e i
npu
t te
rmi
nal
i
n
t
h
e
back
side o
f AV
C-
System
an
d
"IN
P
U
T
S
O
U
RCE"
o
f t
h
e
remote
c
o
n
tr
o
lle
r set
up
c
o
rr
e
c
tl
y
?
···
See t
h
e
Op
e
ra
tio
n
M
anual
an
d set
up
"
IN
P
U
T
S
O
U
RCE"
c
o
rr
e
c
tl
y.
2
) Is
"A
u
dio
Onl
y
" i
n
M
E
N
U
-Op
tio
n
set
"Of
f"?
···
Set it
"Of
f".
Is t
h
e
re
v
ideo si
g
nal
(
C
V
B
S) o
u
tpu
t
a
t
p
in
(1
7
) o
f
Tu
n
e
r (V
ideo o
u
tpu
t te
rmi
nal
)?
Tu
n
e
r (
U
/V) i
n
t
ro
ubl
e
.
<
On
i
npu
t o
f t
h
e t
un
e
r (
U
/V)
>
Is t
h
e
re
v
ideo si
g
nal
i
npu
t
a
t
p
in
(
7
) o
f
IC1
1
06
?
Is t
h
e
re
v
ideo si
g
nal
o
u
tpu
t
a
t
p
in
(
5
) o
f
IC1
1
06
?
Is t
h
e
re
v
ideo si
g
nal
i
npu
t
a
t
p
in
(
6
3
) o
f
IC
38
0
1
(A
V
-S
W
)?
YES
YES
YES
YES
YES
YES
YES
A
re t
h
e MAIN
-Y
an
d S
UB
-Y
si
g
nal
o
u
tpu
t to
P
in
(
5
6
)
an
d
P
in
(
44
) o
f I
C
38
0
1
r
es
p
e
c
ti
v
e
ly
?
Is t
h
e VI
D
EO
si
g
nal
i
npu
t to i
npu
t te
rmi
nal
s
o
f
P
in
(
8
) o
f I
C
4
0
2
(
3
D
-Y
C
)
an
d
P
in
(
1
6
) o
f
IC
5
0
2
(
2
D
-Y
C
)?
On
an
d
af
te
r t
h
is
, see t
h
e te
rm (
1
) i
n
"
No
v
ideo o
u
tpu
t".
On
an
d
af
te
r t
h
is
, see t
h
e te
rm (
1
) i
n
"
No
v
ideo o
u
tpu
t".
Ch
e
ck
b
et
w
ee
n
I
C1
1
06
an
d I
C
38
0
1.
Ch
e
ck
t
h
e t
un
e
r
an
d its
p
e
ri
ph
e
ral
c
ircu
its
.
Ch
e
ck
I
C
4
0
1
(
L
P
F
) t
hru
I
C
4
0
2
(
3
D
-
Y
C
)/
IC
5
0
2
(
2
D
-Y
C
).
NO
NO
NO
NO
NO
Is t
h
e VI
D
EO
si
g
nal
i
npu
t to t
h
e i
npu
t
te
rmi
nal
P
in
(
7
2
) o
f I
C
60
1
(V
PC
)?
Ch
e
ck
I
C
38
0
1
(A
V
-S
W
)
an
d
p
e
ri
ph
e
ral
c
ircu
its
.
Ch
e
ck
P
in
s (
5
6
)(
44
) o
f I
C
38
0
1
t
hru
IC
4
0
1
/600
.
Ch
e
ck
I
C
600
(
L
P
F
) t
hru
I
C
60
1
(V
PC
).
NO
NO
NO
A
re t
h
e MAIN
-Y
an
d S
UB
-Y
si
g
nal
i
npu
t to
P
in
(
2
) o
f I
C
4
0
1
an
d
P
in
(
2
) o
f I
C
600
r
es
p
e
c
ti
v
e
ly
?
Ch
e
ck
b
et
w
ee
n
t
h
e t
un
e
r
an
d I
C1
1
06
.
Ch
e
ck
I
C1
1
06
an
d its
p
e
ri
ph
e
ral
c
ircu
its
.
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