Sharp Aquos LC 26D4U, Service Manual

Page: 42 / 108

42
LC-26D4U
LC-32D4U
LC-37D4U
TROUBLE SHOOTING TABLE
(Continued)
YES
YES YES
YES
NO NO
NO
YES YES
NO NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO NO
<Component video
signal> input
No video output (
5)
External input in trouble <
INPUT
-1>
Is INPUT
1 selected in the inpu
t switching
menu screen?
Select INPUT
1 and the input signal
in the
input switching men
u screen.
When it cannot be selecte
d since the characters
INPUT
-1 on the menu screen
are gray
.
Is the detection functi
on of component
video signal norma
l? Check between pin
(1
1) of J1
107 and pin (78) of IC2501
(MUL
TI_SOUND_PROCESSOR)
.
Are component video
signals supplied to
pins (21) (Y), (23) (PB), and (25) (PR) of IC3800 (A
V SWITCH)?
Check between J1
1
07 and each input pin
of
IC3801.
Are
Y
, PB and PR signals sen
t to pins (60), (59) and (
58) of IC3800 respectively?
External input in trouble <
INPUT
-2>
Is INPUT
2 selected in the inp
ut switching
menu screen?
Select INPUT
2 and the input sign
al in the
input switching menu
screen.
When it cannot be select
ed since the characters
INPUT
-2 on the menu screen
are gray
.
Is component video signal d
etection
functioning normally?
Check between pin (10)
of J1
107 and pin (76) of IC3800 (A
V SWITCH).
Are there signal in
puts at pins (27), (29) and
(31) (Y
, PB, PR) of IC3800 (A
V SWITCH)?
Check between J1
1
07 and each input pi
n
of IC3801.
Check IC3800 and
its peripheral circuits.
Are component video
signals supplied to pi
ns (1), (5) and (25) of IC3703 (L.P
.F) ?
Check between IC3800 and IC3703
.
(Q3800-2, Q3810-12
, etc.)
Are component video
signals sent to pins (14), (1
1) and (17) of IC3703?
Check IC3703 and
its peripheral circuits.
Are component video
signals sent to pins (12), (10) and (8)
of
A
V_UNIT
connector (FD_SC5
701)?
Check between IC3800 and SC5701. (Q3802, Q3810, etc.)
Are component video
signals supplied to pi
ns (22), (24) and (26)
of MAIN_UNIT
connector (FD
_SC3201)?
Check the FFC harne
ss "FD".
Are component video
signals supplied to pi
ns (13) (GAIN0), (20) (BAIN0) and (5) (RAIN
0) of IC3700 (A/D_CONV
.)?
Check between IC3703 and IC3
700.
Are digital video si
gnals sent from pins (97)-(90), (87)
-(80), (77)-(70), (64)-(57), (120)-
(1
13), etc. of IC3700?
Check IC3700 and
its peripheral circuits.
Replace the main PWB, or check between IC3700 and IC320
1.
Check IC3201 (L
VDS
TRANSMITTER) and
the peripheral cir
cuits.
Are there digital vi
deo signal outputs at pi
ns (49)(T
A1–), (48)(T
A1+), (47)(T
B1–), (46)(TB1+), (44
)(TC1–), (43)(TC1+), (41)(TCLK–), (42)(TCLK+), (40)(TD1–),
(39)(TD1+), (37)(T
A2–), (36)(T
A2+), (35)(T
B2–), (34)(TB2+), (32)(
TC2–), (31)(TC2+), (3
0)(TCLK2–),(29)(TCLK2+), (28)(TD2–), and (27)(TD2+) of IC3201?
Are there digital vi
deo signal inputs at pin
s (53), (54), (57)~(60), (51), (52) (RE0-7), pins(63)~(
68), (61), (62) (GE0-7), pins (73)~(78
), (69), (70) (BE0-7), pins
(81)~(86), (79), (80)
(RO0-7), pins (91)~(96)
, (89), (90) (GO0-7), pins (99), (100), (1),
(2), (5), (6), (97), (98) (BO0-7), and pins (7)~(10
) (HSYNC, VSYNC,
DE,
CLKIN) of IC3201 (L
VDS TRANSMITTER)?
Check the LCD CONTRO
L P
WB.