Read Sharp LC-37GA3E (serv.man8) Service Manual online
39
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
YES
YES
YES
YES
YES
NO
NO
<Signals>
<CVBS,
Y/C, S-VIDEO signal> input
No VIDEO output (1)
External input in trouble <lNPUT
-1>
Is Input1 selected in the input switching
menu screen?
Select Input1 and the input signal in
the input switching menu screen .
Is there VIDEO signal input at each VIDEO
input terminal of IC3801 (A
V SWITCH)?
(CVBS signal input)
Check between pin (20) of SC1
101
and pin (1) of IC3801.
External input in trouble <INPUT
-2>
Is Input 2 selected in the input switching menu
screen?
Select Input 2 and the input signal in the
input switching menu screen.
Is there VIDEO signal input at each VIDEO
input terminal of IC3801 (A
V SWITCH)?
(Y/C VIDEO signal input)
Are there
Y
and C signals input at pins (10) and (12)?
(CVBS signal input)
Is there VIDEO signal input at pin (8) ?
(CVBS signal input)
Check between pin (20) of SC1
102 and
pin (8) of IC3801 .
(Y/C VIDEO signal input)
Check between pins (20) and (15) of
SC1
102 and pins (10) and (12) of IC3801.
External input in trouble <INPUT
-3>
Is Input 3 selected in the input switching menu
screen?
Select Input 3 and the input signal in the
input swltching menu screen.
Is there VIDEO signal input at each VIDEO
input terminal of IC3801 (A
V SWITCH)?
(CVBS signal input)
Is there VIDEO signal input at pin (15)?
(Y/C VIDEO signal input)
Are there
Y
and C signals input at pins (17) and (19)?
(CVBS signal input)
Check between pin (20) of SC1
103 and
pin (15) of IC3801.
(Y/C VIDEO signal input)
Check between pins (20) and (15) of
SC1
103 and pins (17) and (19) of IC3801.
External input in trouble <lNPUT
-4>
Is Input 4 selected in the input switching menu
screen ?
Select Input 4 and the input signal in the
input switching menu screen.
Check IC3801 (A
V SWITCH) and the peripheral circuits.
Is there VIDEO signal input at each VIDEO input
terminal of IC3801 (A
V SWITCH)?
(S-VIDEO signal input)
Are there
Y
and C signals input at pins (24) and (26)?
(VIDEO signal input)
Is there VIDEO signal input at pin (22) ?
(VIDEO signal input)
Check between pin (2) of J142 and pin (22)
of IC3801.
(S-VIDEO signal input)
Check between pins (3) and (4) of J141 and
pins (24) and (26) of IC3801.
(CVBS, VIDEO Signal Input) :
Are there MAIN VIDEO signal output at pin (56) of IC3801 and SUB VIDEO signal output at pin (44)?
(Y/C, S-VIDEO Signal Input):
Are there MAIN-Y
signal output at pin (56) of IC3801 , MAIN-C signal output at pin (58), SUB-Y
sig
nal output at pin (44) and SUB-C signal output at pin (47)?
(CVBS, VIDEO Signal Input) :
Are there VIDEO signals input at pin (8) of IC401 (MAIN L.P
.F
.) and pin (2) of IC600 (SUB L.P
.F
.)?
(Y/C, S-VIDEO Signal Input) :
Are there MAIN-Y
and MAIN-C signals input at pins (8) and (1
1) of IC401.
Are there SUB-Y
and SUB-
C signals input at pins (2) and (6) of IC600?
<MAIN>
3D-YIC (P
AL)
(CVBS, VIDEO signal input)
Is there VIDEO signal input at pin (8) of
IC402 (MAIN 3D-YC & CHROMA) ?
(Y/C, S-VIDEO signal input)
Are there
Y
and C signals input at pins (8) and
(18) of IC402 (MAIN 3D-YC & CHROMA) ?
Check between IC401 and IC402.
Are there digital VIDEO signal outputs at
pins (124)-(133) and (140)-(159) of IC402?
Check IC402 and the peripheral circuits
<MAIN>
2D-Y/C (SECAM)
(CVBS, VIDEO signal input)
Is there VIDEO signal input at pin (12) of
lC502 (MAIN 2D-YC & CHROMA) ?
(Y/C, S-VIDEO signal input)
Are there
Y
and C signals input at pins (12) and
(16) of IC5O2 (MAIN 2D-YC & CHROMA) ?
Check between IC401 and IC502.
Are there digital VIDEO signal outputs at
pins (1
15)-(126) and (133)-(144) of IC502?
Check IC502 and the peripheral circuits.
<SUB>
(CVBS, VIDEO signal input)
Is there VIDEO signal input at pin (72) of
IC601 (SUB 2D-YC & CHROMA) ?
(Y/C, S-VIDEO signal input)
Are there
Y
and C signals input at pins (72)
and (71) of IC601 (SUB 2D-YC & CHROMA) ?
Check between IC401 and IC601.
Are there digital VIDEO signal outputs at
pins (31)-(40) and (41)-(50) of IC601 ?
Check IC601 and the peripheral circuits.
Check between IC3801 and
IC401/IC600.
Are there digital VIDEO signal inputs at pins (53), (54), (57)-(60), (51), (52) (RE0-7), pins(63)-(68), (61), (62) (GE0-7), pin
s (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) (B
O0-7), and pins (7)-(10)
(HSYNC, VSYNC, DE, CLKIN) of IC3201 (L
VDS
TRANSMITTER)?
Replace the main PWB, or check between
IC402/C502/lC601 and IC3201.
Are there digital VIDEO signal outputs at pins (49)(T
A1-), (48)(T
A1+), (47)(TB1 -), (46)(TB1 +), (44)(TC1 -), (43)(TC1 +),(41)(
TCLK-), (42)(TCLK+),
(40)(TD1 -), (39)(TD1+), (37)(T
A2-), (36)(T
A2+), (35)(TB2-), (34)(TB2+), (32)(TC2-), (31)(TC2+), (30)(TCLK2-),(29)(TCLK2+), (28
)(TD2-) and
(27)(TD2+) of IC3201?
Check IC3201 (L
VDS_TRANSMITTER)
and the peripheral circuits.
Check the LCD CONTROL
PWB.
(CVBS signal input)
Is there VIDEO signal input at pin (1) ?
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