Sharp LC-32GA3E (serv.man8) Service Manual ▷ View 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) ?
40
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
NO
YES
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
<Signals>
<COMPONENT
, RGB signal> input
No video output (2)
External input in trouble <lNPUT
-1 >
Is Input 1 selected in the input switching
menu screen?
Select Input 1 and the input signal in
the input swltching menu screen.
Is there video signal input at each video
input terminal of IC3805 (A
V SWITCH)?
(RGB signal input)
Are there RGB signals input at pins (63),
(61) and (59) ?
(RGB signal input)
Check between pins (15), (1
1) and (7)
of SC1
101 and pins (63), (61) and (59)
of IC3805 .
External input in trouble <lNPUT
-3>
Is Input 3 selected in the input switching menu screen?
Select Input 3 and the input signal in the input
switching menu screen.
Is there video signal input at each video input terminal of
IC3805(A
V SWITCH)?
(COMPONENT
input)
Are there
Y
, Pb and Pr signals input at pins (15), (17) and (19) ?
(RGB signal input)
Are there RGB signals input at pins (9), (5) and (7)?
(COMPON ENT
input)
Check between pins (2), (7) and (4) of J1
101 and pins
(15), (17) and (19) of IC3801.
(RGB signal input)
Check between pins (15), (1
1) and (7) of SC1
103 and
pins (9), (5) and (7) of IC3805 .
Are there MAIN VIDEO signals output at pins (50), (48) and (46) (Y
, Pb and Pr signals) , P
ASS VIDEO signals output at pins (38)
, (36) and (34) (Y
, Pb and Pr signals) and SUB VIDEO signal output at pins
(44), (42) and (40) (Y
, Pb and Pr signals) of IC3805?
<MAIN>
RGB Signals
Are there MAIN VIDEO signals input to pins
(24), (29) and (32) (Y
, Cb and Cr) of IC502
(2D-YC & CHROMA) form pins (50), (48)
and (46) (Y
, Pb and Pr) of IC3805 ?
Check between IC3805 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>
RGB / COMPONENT
Signals
Are there VIDEO signals input to pins (8), (10)
and (13) (Y
, Pb and Pr) of IC600 (L.P
.F
.) form pins
(44), (42) and (40) (Y
, Pb and Pr) of IC3805 ?
Check between IC3805 and IC600.
Are there SUB VIDEO signal input to pins (2),
(1) and (3) (Y
, Cb and Cr) of IC601 (2D-YC &
CHROMA)?
Check between IC600 and IC601.
Are there digital video signal output at pins (31)
-(40) and (41) - (50) of IC601 ?
Check IC601 and the peripheral circuits.
<MAIN>
COMPONENT
Signals
Are there VIDEO signals input to pins (9), (12) and
(14) (Y
, Pb and Pr) of IC401 (L.P
.F
.) form pins (38),
(36) and (34) (Y
, Pb and Pr) of IC3805 ?
Check between IC3805 and IC401 .
Are there MAIN VIDEO signal input to pins (8),
(18) and (20) (Y
, Cb and Cr) of IC402 (3D-YC &
CHROMA)?
Check between IC401 and IC402.
Are there digital video signal output at pins
(124) - (133) and (140) - (159) of IC402?
Check IC402 and the peripheral circuits.
Check IC3805 (A
V SWITCH) and the
peripheral circuits.
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) (BO0-7), an
d pins (7)-(10) (HSYNC, VSYNC, DE,
CLKIN) of IC3201 (L
VDS
TRANSMITTER)?
Replace the main PWB, or check between
IC402/IC502/IC601 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_TRANSMlTTER) and
the peripheral circuits.
Check the LCD CONTROL
PWB.
41
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
YES
YES
YES
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
NO
NO
No video output (3)
No
TV video outpuut.
Is
TV selected in the input switching menu
screen?
Select
TV in the input switching menu
screen. Check that "Audio Only" is "Of
f".
Is there
TV video signal output at pin (17) of
T
uner?
Check tuner and and the peripheral circuits.
Is there
TV video signal output at pin (5) (TP1
183)
of IC1
106 (LEVEL
ADJ.)?
Is there LEVEL
CTL
signal input to pin (6) of
IC1
106 from IC1
108?
Is there
TV video signal input at pin (63) of
IC3801 (A
V SWITCH)?
Are there VIDEO signals input at pin (8) of IC401 (MAIN L.P
.F
.) and pin (2) of IC600 (SUB L.P
.F
.)?
Check IC3801 (A
V SWITCH) and the
peripheral circuits.
Are there MAIN VIDEO signal output at pin (56) and SUB VIDEO signal output at pin (44) of IC3801 ?
Check between IC3801 and IC401/lC600.
<MAIN>
3D-Y/C (P
AL)
Is there video signal input at pin (8) 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)
Is there video signal input at pin (12) of IC502
(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>
Is there video signal input at pin (72) 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.
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) (BO0-7), and pins (7)-(10) (
HSYNC, VSYNC, DE, CLKIN) of IC3201 (L
VDS
TRANSMITTER)?
Replace the main PWB, or check between
IC402/IC502/IC601 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 )(TCL
K-), (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+) o
f IC3201?
Check IC3201 (L
VDS
TRANSMITTER) and the
peripheral circuits.
Check the LCD CONTROL
PWB.
42
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
YES
YES
NO
NO
NO
NO
NO
Are there Rx0, 1, 2 and C signal
inputs to IC1900 (HDCP_LSI)?
inputs to IC1900 (HDCP_LSI)?
Is each signal sent from Hsync (pin
18), Vsync (pin 19) and RGB (pins
23, 26 and 31) of IC1900?
18), Vsync (pin 19) and RGB (pins
23, 26 and 31) of IC1900?
Are DVI/SR/SG/SB and DVI_H/V
signals sent from MD connector?
signals sent from MD connector?
Are outputs at pins (12) and (14) of
IC1917 both (H, H)?
IC1917 both (H, H)?
Check PC settings.
Check IC1915 and its
peripheral circuits.
peripheral circuits.
Check IC1917 and its
peripheral circuits.
peripheral circuits.
Check IC1900 and its peripheral
circuits.
circuits.
Check IC1901, IC1903 and their
peripheral circuits.
peripheral circuits.
Do output pins (12) and (14) of
IC1917 become (L, L) when analog
AV mode is entered?
IC1917 become (L, L) when analog
AV mode is entered?
NO
YES
YES
Check ME connector I
2
C signal line.
Are IC1915 data accessed by I2C
when connected to PC?
when connected to PC?
Are DVI/SR/SG/SB and DVI_H/V
signals supplied to IC3700 (ADC)
and 3701 (SYNC_SELECTOR) on
the main PWB?
signals supplied to IC3700 (ADC)
and 3701 (SYNC_SELECTOR) on
the main PWB?
Check MD harness for disconnection.
YES
Check IC3700, IC3701 and their
peripheral circuits.
peripheral circuits.
YES
<Signal mode>
Image from DVI input does not appear (digital PC is not displayed) (1)