Sharp Aquos LC 26D7U, Service Manual

Page: 52 / 214

52
LC-26D7U
LC-32D7U
LC-37D7U
TROUBLE SHOOTING TABLE
(Continued)
YES YES
YES
YES YES YES
YES YES
NO NO
YES YES
NO NO NO NO NO NO
YES
NO NO NO
<Signals>
No video output (1)
<Composite video si
gnal> input
External input in trouble <INPUT
-1>
Is INPUT
1 selected in the inpu
t switching
menu screen?
Is video signal dete
ction functioning
normally? Check be
tween pin (1
1) of J1
101
and pin (9) of IC1
1
02.
Check between pin
(8) of J1
101 and pin (65)
of IC3800. Select INPUT
1 and the input signal
in the
input switching men
u screen.
When it cannot be selected since
the characters
INPUT
-1 on the menu
screen are gray
.
Is video signal dete
ction functioning
normally? Check be
tween pin (10) of J1
101
and pin (1
1) of IC1
102.
Check between pin
(9) of J1
101 and pin (71)
of IC3800. Check IC3800 (A
V SWITCH) and the
peripheral circuits.
Select INPUT
2 and the input sign
al in the
input switching menu
screen.
When it cannot be
selected since the
characters
INPUT
-2 on the menu
screen are gray
.
Is there video signal input at pin (65) of IC3800 (A
V SWITCH)?
Is video signal supp
lied to pin (22) of MAIN_UNIT
connector (FD_SC3201)?
Is video signal supp
lied to pin (85) of IC400
(3D-YC & CHROMA) through L.P
.F
. consisting of Q41
1 and Q412?
Are there digital video signal inputs at pi
ns (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), (8
0) (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)?
Are there digital video 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)(T
D1–), (39)(TD1+), (37)(T
A2–), (36)(T
A2+), (35)(T
B2–), (34)(TB2+), (32)(TC2
–), (31)(TC2+), (30)(TCLK2
–),(29)(TCLK2+),
(28)(TD2–), and (27)(TD2+) of IC3201?
Is INPUT
2 selected in the inp
ut switching
menu screen? Is there video signal input at pin (71) of IC3800 (A
V SWITCH)?
Are there VIDEO signal output at pin (60) of IC3800? Is video signal sent to
pin (12) of
A
V
_UNIT
connector (FD_SC5701
)?
External input in trouble <INPUT
-2>
Check between IC3800 and SC5701. (Q3802, Q3810, etc.)
Check the FFC harne
ss "FD".
Check between IC3800 and IC400. (Q3802, Q3810, Q41
1, Q412, etc.)
Are digital video si
gnals sent from pins (43), (44), (46)
-(49), (54), (55) and (58) of IC400?
Check IC400 and its peripheral circuits. Replace the main PWB, or check between IC400 and IC3201. Check IC3201 (L
VDS
TRANSMITTER) and
the peripheral circuits.
Check the LCD CONTROL
PWB.