Sharp LC-32GA3E (serv.man8) Service Manual ▷ View online
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)
43
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
YES
YES
NO
NO
NO
NO
NO
Are there RGB signal inputs at pins
(25), (26) and (27), and Hsync/Vsync
signal inputs at pins (28) and (8) from
DVI connector (SC1900)?
(25), (26) and (27), and Hsync/Vsync
signal inputs at pins (28) and (8) from
DVI connector (SC1900)?
Is each signal sent from Hsync and
Vsync (pin 4, 6), of IC1904
(INVERTER)?
Vsync (pin 4, 6), of IC1904
(INVERTER)?
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(CONTROL) both (H, L)?
IC1917(CONTROL) both (H, L)?
Check PC settings.
Check IC1915 and its
peripheral circuits.
peripheral circuits.
Check IC1917 and its
peripheral circuits.
peripheral circuits.
Check IC1904 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 digital AV mode is
entered?
become (L, L) when digital AV mode is
entered?
NO
YES
YES
Check ME connector I2C signal line.
Are IC1915(E2PROM) data accessed
by I2C when connected to PC?
by I2C 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
Image from DVI input does not appear (Analog PC is not displayed) (2)
44
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)?
Are signals sent from Hsync (pin 18),
Vsync (pin 19) and RGB (pins 23, 26
and 31) of IC1900?
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 IC1911 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 (H, L) when analog PC mode
is entered?
become (H, L) when analog PC mode
is entered?
NO
YES
YES
Check ME connector I2C signal line.
Are IC1911 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
Image from DV1 input does not appear (digital AV is not displayed) (3)
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