Read Sharp LC-45GD1E (serv.man29) Service Manual online
53
TU-45GD1E
LC-45GD1E
LC-45GD1E
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.
+ -
+ -
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