Sharp LC-45GD1E (serv.man29) Service Manual ▷ View online
51
TU-45GD1E
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TROUBLE SHOOTING TABLE
(Continued)
No sound (2) (On the reception of TV broadcasting)
Is the SIF audio signal input to Pins (67)(69)
of IC2501 (MSP)?
No audio output on the reception of
UHF/VHF
.
Is the SIF signal output from Pin (7) of
TUNER (TU1
101)?
Check the
TUNER (TU1
101) and its
peripheral circuits.
Check the signal LINE of Pins (33)(34) of
IC2501 thru Pins (32)(33) of IC2514 and
peripheral circuits.
YES
NO
NO
Check IC2514 and peripheral circuits.
Confirm the connection of 1 bit-AMP
and
replace it.
Check the SP-SW and 1B-RELA
Y
signals
are coming to Pins (1)(2) of SF connector
.
YES
YES
YES
YES
Is the audio signal of Pins (33)(34) of IC2501
(MSP) thru Pins (32)(33) of IC2514
(CODEC) normal?
Is each audio output from Pins (28)(29) of
IC2514 normal?
Is audio output of Pins (28)(29) of IC2514
thru 1 bit-AMP
input (SA/CNA101) normal?
Is output from 1 bit-AMP
(SC/CNA102)
normal?
Is connector of
AUDIO-I/F PWB (SC/P6003)
thru Relay switching of R
Y6001 (SPEAKER
ON/OFF switching) and R
Y6000 (SPEAKER
A/B switching) normal?
Check DISPLA
Y
-OUTPUT3 (SC6001) and
SYSTEM-CABLE (BLACK).
NO
YES
YES
NO
NO
NO
NO
No audio output on the reception of DTV
.
Is the MAIN-L/R signal of Pins (52)(54) of
IC3801 thru Pins (56)(57) of IC2501 coming
normally?
Is the DTV
-L/R signal coming to Pins
(59)(61) of IC3801 (A
V
-SW) normally?
DVB-T
UNIT
: Is the L/R audio signal output
from Pins (27)(29) of P8903?
Check IC3801 (A
V
-SW) and peripheral
circuits.
Confirm the connection of Pins (27) thru (29)
of MA-connector (P3802) and B/B (P8903).
Check IC8904 and peripheral circuits.
Check IC8905 and peripheral circuits.
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is the L/R audio signal output to Pins
(91)(95) of IC8905?
Is the digital signal input to Pins (15-17)(19)
of IC8905?
Check IC8801-8802, IC8804-8805,IC8601
and peripheral circuits.
Check the connection of SA
connector and
to 1 bit-AMP
.
1) Is a Headphone connected?
···Disconnect it.
2) In the MENU-Option, is "Audio Out" set to "Fixed"?
···Set it "Fixed".
3) In the MENU-Option, is "Centre Channel input" set to "of
f"?
···Set it "of
f".
4) In the MENU-Set up, is "Speaker Setup" set to "SPEAKER-A"?
···Set it "SPEAKER-A".
52
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TROUBLE SHOOTING TABLE
(Continued)
No picture (1)
No INPUT1 output of the external input
system.
Is "INPUT1" selected with the "INPUT
SOURCE"
button ( ) of the remote controller?
Check Pin (20) of SCAR
T1 (SC1
101) thru
Pins (1)(3) of IC3801.
Select "INPUT1" with the "INPUT
SOURCE" button ( ) of the remote
controller
, select Option-Input Select in the
MENU item, 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 V
ideo signal (CVS1) input
to input terminals Pins (1)(3) of IC3801 (A
V
-
SW)?
No INPUT2 output of the external input
system.
Is "INPUT2" selected with the "INPUT
SOURCE"
button ( ) of the remote controller?
Select "INPUT2" with the "INPUT
SOURCE" button
( ) of the remote controller
, select Option-
Input Select in the MENU item, and then select
Signal
T
ype of the input signal.
Check Pin (20) of SCAR
T2 (SC1
102) thru
Pins (8)(10) of IC3801.
Check IC3801 (A
V
-SW) and peripheral
circuits.
Check IC3801 (A
V
-SW) thru IC401/IC600.
Check IC600 (LPF) thru IC601 (VPC).
Check IC402 (3D-YC), IC502 (2D-YC) and
IC601 (VPC) thru IC3201 (L
VDS_TX), or
replace the main PWB.
Check IC3201 (L
VDS_TX) and peripheral
circuits.
Check IC3201 thru SC3200.
YES
YES
YES
YES
Is the Composite V
ideo signal (CVS2) input
to input terminals Pins (8)(10) of IC3801 (A
V
-
SW)?
<On input of the Composite V
ideo signal>
Are MAIN-V
ideo signal and SUB-V
ideo signal output to Pins (56) and (44) of IC3801 (A
V
-SW) respectively?
<On input of the Composite V
ideo signal>
Are MAIN-V
ideo signal and SUB-V
ideo signal input to Pin (8) of IC401 (LPF) and Pin (2) of IC600 (LPF) respectively?
Is the VIDEO signal input to input terminals
of Pin (8) of IC402 (3D-YC) and Pin (16) of
IC502 (2D-YC)?
(MAIN V
ideo System)
Is the digital video signal output from Pins
(124) thru (133) of IC402 and Pins (1
15) thru
(126) of IC502?
Are the digital video signal and H/V
-SYNC signal input to Pins (51) thru (78) and Pins (7) thru (10) of IC3201 (L
VDS_TX) respec
tively?
Is the digital video signal output to Pins (39) thru (49) of IC3201 (L
VDS_TX)?
Is the digital video signal(T
A
~
TD )output to Pins (2) thru (15) of L
V
Connector (SC3200)?
No problem in the MAIN PWB. Check the
TMDS PWB.
Is the input/output signal of Pins (9) thru (20) of IC3105 ~ Pins (21) thru (31) of IC3101 in the
TMDS PWB normal?
Are the Connector SC3102 of DISPLA
Y_OUTPUT1 and the SYSTEM_CABLE normal?
Check the LCD_DISPLA
Y
side.
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Check IC401 (LPF) thru IC402 (3D-
YC)/IC502 (2D-YC).
NO
Check IC402 (3D-YC), IC502 (2D-YC) and
peripheral circuits.
NO
YES
YES
Is the VIDEO signal input to the input
terminal Pin (72) of IC601 (VPC)?
(SUB V
ideo System)
Is the digital video signal output from Pins
(41) thru (50) of IC601?
Check IC601 (VPC) and peripheral circuits.
Check the input/output signal of
IC3105/IC3101 in the
TMDS PWB and
peripheral circuits.
Check the Connector SC3102 of
DISPLA
Y_OUTPUT1 and the
SYSTEM_CABLE.
+
+ -
-
53
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TROUBLE SHOOTING TABLE
(Continued)
No picture (2)
No INPUT3 output of the external input
system.
<On input of the Composite V
ideo signal and COMPONENT>
Is "INPUT3" selected with the "INPUT
SOURCE"
button ( ) of the remote controller?
Check Pin (41) of INPUT3 (SC1
102) thru
Pins (15)(17) of IC3801.
Check Pins (3)(8)(12) of the INPUT3-
COMPONENT
terminal thru Pins
(15)(17)(19) of IC3805.
Select "INPUT3" with the "INPUT
SOURCE"
button ( ) of the remote controller
, select
Option-Input Select in the MENU item, 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 V
ideo signal (CVS3) input
to input terminals Pins (15)(17) of IC3801
(A
V
-SW)?
<COMPONENT
video signal input>
Are there the
Y/PB/PR input signals at pins
(15), (17) and (19) of IC3805?
No INPUT4 output of the external input
system.
Is "INPUT4" selected with the "INPUT
SOURCE"
button ( ) of the remote controller?
Select "INPUT4" with the "INPUT
SOURCE" button
( ) of the remote controller
, select Option-Input
Select in the MENU item, and then select Signal
T
ype of the input signal.
Check IC3801 (A
V
-SW) and peripheral
circuits.
Check IC3801 (A
V
-SW) thru IC401/IC600.
Check IC600 (LPF) thru IC601 (VPC).
Check IC402 (3D-YC), IC502 (2D-YC) and
IC601 (VPC) thru IC3201 (L
VDS_TX), or
replace the main PWB.
Check IC3201 (L
VDS_TX) and peripheral
circuits.
Check IC3201 thru SC3200.
YES
YES
YES
YES
<On input of the Composite V
ideo signal>
Are the MAIN V
ideo signal and the SUB V
ideo signal output to Pin (56) and Pin (44) of
IC3801 (A
V
-SW) respectively?
<On input of the S-V
ideo signal>
Are the MAIN-Y
and MAIN-C signal output to Pin (56) and Pin (58) of IC3801 (A
V-SW) respectivel
y,
and are the SUB-Y
and SUB-C signal output Pin (44) and Pin (47) respectively?
<On input of the Composite V
ideo signal>
Are the MAIN V
ideo signal and the SUB V
ideo signal input to Pin (8) of IC401 (LPF) and
Pin (2) of IC600 (LPF) respectively?
<On input of the S-V
ideo signal>
Are the MAIN-Y
and MAIN-C signal input to Pin (8) and Pin (1
1) of IC401 (LPF) respectively
, an
d are the SUB-Y
and SUB-C signal input Pin (2) and Pin (6) of IC600 (LPF) respectively?
Is the VIDEO signal input to the input terminals of Pin
(8) of IC402 (3D-YC) and Pin (16) of IC502 (2D-YC)?
<On input of the S-V
ideo signal>
Are the
Y
and C
signal input to Pin (8) and Pin (18) of IC402
respectively
, and are the
Y
and C signal input to Pin
(16) and Pin (12) of IC502 respectively?
(MAIN V
ideo System)
Is the digital video signal output from Pins
(124) thru (133) of IC402 and Pins (1
15) thru
(126) of IC502?
Are the digital video signal and the H/V
-SYNC signal input to Pins (51) thru (78) and Pins (7) thru (10) of IC3201 (L
VDS_TX) re
spectively?
Is the digital video signal output to Pins (39) thru (49) of IC3201 (L
VDS_TX)?
Is the digital video signal(T
A
~
TD ) output to Pins (2) thru (15) of the L
V
Connector (SC3200)?
No problem in the MAIN PWB. Check the
TMDS PWB.
Is the input/output signal of Pins (9) thru (20) of IC3105 ~ Pins (21) thru (31) of IC3101 in the
TMDS PWB normal?
Are the Connector SC3102 of DISPLA
Y_OUTPUT1 and SYSTEM_CABLE normal?
Check the LCD_DISPLA
Y
side.
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Check the line between pin (2) of RCA
pin
(J2404) (INPUT4) and pin (22) of IC3801.
Check INPUT4 and Pins (3)(4) of the S-
T
erminal (J2401) thru the input terminal Pins
(24)(26) of IC3801 (A
V
-SW).
Is the V
ideo signal (V4-V) input to the input
terminal Pin (22) of IC3801 (A
V
-SW)?
<S video signal input>
Are there the
Y/C input signals at pins (24)
and (26) (input terminals) of IC3801?
NO
NO
Check IC401 (LPF) thru IC402 (3D-
YC)/IC502 (2D-YC).
NO
Check IC402 (3D-YC), IC502 (2D-YC) and
peripheral circuits.
NO
YES
YES
Is the VIDEO signal input to the input
terminal Pin (72) of IC601 (VPC)?
<On input of the S-V
ideo signal>
Are the
Y
and C signal input to Pin (72) and Pin (71) of
IC601 respectively?
(SUB V
ideo System)
Is the digital video signal output from Pins
(41) thru (50) of IC601?
Check IC601 (VPC) and peripheral circuits.
Check the input/output signal of
IC3105/IC3101 in the
TMDS PWB and
peripheral circuits.
Check the Connector SC3102 of
DISPLA
Y_OUTPUT1 and SYSTEM_CABLE.
+ -
+ -
54
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TROUBLE SHOOTING TABLE
(Continued)
(MAIN V
ideo System)
(SUB V
ideo System)
No picture (3)
Set-up Confirmation :
1)
Are the input terminal in the backside of
A
V
C-System and "INPUT
SOURCE" of the remote controller set up correctly? ···See th
e Operation Manual and set up "INPUT
SOURCE" correctly
.
2) Is "Audio Only" in MENU-Option set "Of
f"? ···Set it "Of
f".
Is there video signal (CVBS) output at pin
(17) of
T
uner (V
ideo output terminal)?
V
ideo output missing at tuner (U/V) reception?
<On input of the tuner (U/V)>
Is there video signal input at pin (7) of
IC1
106?
Is there video signal output at pin (5) of
IC1
106?
Is there video signal (CVBS) input at pin (63)
of IC3801 (A
V
-SW)?
YES
YES
YES
YES
YES
YES
YES
Are the MAIN-Y
and SUB-Y
signal output to Pin (56) and Pin (44) of IC3801 respectively?
Is the VIDEO signal input to input terminals
of Pin (8) of IC402 (3D-YC) and Pin (16) of
IC502 (2D-YC)?
On and after this, see the term (1) in "No picture".
On and after this, see the term (1) in "No picture".
Check between IC1
106 and IC3801.
Check the tuner and its peripheral circuits.
Check IC401 (LPF) thru IC402 (3D-
YC)/IC502 (2D-YC).
NO
NO
NO
NO
NO
Is the VIDEO signal input to the input
terminal Pin (72) of IC601 (VPC)?
Check IC3801 (A
V
-SW) and peripheral
circuits.
Check Pins (56)(44) of IC3801 thru
IC401/600.
Check IC600 (LPF) thru IC601 (VPC).
NO
NO
NO
Are the MAIN-Y
and SUB-Y
signal input to Pin (8) of IC401 and Pin (2) of IC600 respectively?
Check between the tuner and IC1
106.
Check IC1
1
06 and its peripheral circuits.
