Sharp LC-19D1EWH (serv.man5) Service Manual ▷ View online
LC-19D1E/S-BK/WH
4 – 4
Power supply (troubleshooting): A power supply does not come to each main circuit or IC. (4)
The power supply of a PANEL system does not operate.
Checklist:
1) The check of the front page POW (1) is completed.
• • • UR12V is output to SC1204 (MAIN-PCB).
(If UR12V is not output, confirm the POW(1) again and repair.)
2) Check that BU3.3V is supplied to IC2002 (SUB-MICON), and the AC-CTL signal H is output from 35pin within a MAIN board.
(If BU3.3V is not supplied, check IC2004 (BU3.3V-REG) and a periferal circuit.)
3) Refer to attached sheet Power-Block diagram.
Is B12V output from pin(6) of Q702(SW)?
NO
Check the soldering of Q702(SW) or exchange it.
YES
Is VGL(-7V)/VGH (28V) output from pin(1)/(3) of IC704(SW-
REG)?
REG)?
NO
Check the soldering of Q704(SW-REG) or exchange it.
YES
Is VLSB14.6V output from pin(3) of IC701 (VLSB14.6V-REG)?
NO
Check the soldering of IC701(VLSB12V-REG) or exchange it.
YES
Is VH24/VH56/VL 56/VL24 output from pin(7)/(1)/(8)/ (14) of
IC1001(OP-AMP)?
IC1001(OP-AMP)?
NO
Check the soldering of IC1001(OP-AMP) or exchange it.
YES
Is COM-BIAS output (4.2V) from pin(7) of IC9202(COM-BIAS)?
NO
Check the soldering of IC9202(COM-BIAS) or exchange it.
YES
Is each voltage supplied to SC9201(CONN) ?
(VLSB14.6V,VGH,VGL,COM-BIAS)
(VLSB14.6V,VGH,VGL,COM-BIAS)
NO
Check the soldering of SC9201(CONN) or exchange it.
YES
Check the FPC of PANEL or exchange PANEL-MODULE.
LC-19D1E/S-BK/WH
4 – 5
No sound (1) (during the reception of DTV broadcasting)
No audio output during
DTV reception
DTV reception
Checklist :
1) Is the volume set to MIN or MUTE on the remote control ?
1) Is the volume set to MIN or MUTE on the remote control ?
• • • Set the desired volume.
2) Is ANT-CABLE disconnected or connected improperly ?
• • • Connect it correctly as per the operation manual.
(AV-UNIT)
(DIGITAL-UNIT)
Is the audio signal (L/R)
input to pins (17) and (18)
of IC501 (AV-SW)?
input to pins (17) and (18)
of IC501 (AV-SW)?
NO
Is the DTV-A-_L/R signal
output from pins (7) and
(1) of IC4605 (OP-AMP)?
output from pins (7) and
(1) of IC4605 (OP-AMP)?
YES
Check either pins (8) and
(9) of Connector SC4602
or pins (8) and (9) of
Connector P503, or
check peripheral circuits.
(9) of Connector SC4602
or pins (8) and (9) of
Connector P503, or
check peripheral circuits.
YES
NO
Is the audio signal
(TERMINAL_L/R) output
from pins (34) and (33) of
IC501 (AV-SW)?
(TERMINAL_L/R) output
from pins (34) and (33) of
IC501 (AV-SW)?
NO
Check the power sup-
ply B9V pins (38) and
peripheral circuits.
ply B9V pins (38) and
peripheral circuits.
Is the audio signal (LEFT/
RIGHT_P/M) output from
pins (25)(24) and (29)(28)
of IC4001 (DIGITAL-
PROCESSOR) ?
RIGHT_P/M) output from
pins (25)(24) and (29)(28)
of IC4001 (DIGITAL-
PROCESSOR) ?
YES
Are LEFT_P/M and the
RIGHT_P/M signal input
to pins (5)(6) (3)(2) of
IC4605 (AMP)? or check
peripheral circuits.
RIGHT_P/M signal input
to pins (5)(6) (3)(2) of
IC4605 (AMP)? or check
peripheral circuits.
(MAIN-UNIT)
YES
NO
Is the audio signal
(LOUT2/ROUT2) output
form pins (25) and (23) of
IC302 (A-CODEC) prop-
erly?
(LOUT2/ROUT2) output
form pins (25) and (23) of
IC302 (A-CODEC) prop-
erly?
NO
Check pins (1) and (4)
of IC302 (A-CODEC),
pins (11) and (12) of
Connector SC1202,
audio-mute line (Q301/
Q302) or peripheral
circuits.
of IC302 (A-CODEC),
pins (11) and (12) of
Connector SC1202,
audio-mute line (Q301/
Q302) or peripheral
circuits.
Is the serial digital signal
(TSOUT7) input to pin
(36) of IC4001(DIGITAL-
PROCESSOR)?
(TSOUT7) input to pin
(36) of IC4001(DIGITAL-
PROCESSOR)?
YES
Check the power supply
3.3V pins (3-129) 2.5V
pins (151-212) and 1.2V
pins (8-204) of IC4001
(DIGITAL PROCES-
SOR). Or check periph-
eral circuits.
3.3V pins (3-129) 2.5V
pins (151-212) and 1.2V
pins (8-204) of IC4001
(DIGITAL PROCES-
SOR). Or check periph-
eral circuits.
YES
NO
Is the audio signal L-CH
output to pins (44-45)
and (40-41) of IC303
(POWER-AMP) and also
the audio signal R-CH
output to pins (20-21)
and (16-17) of IC303
(POWER-AMP) properly?
output to pins (44-45)
and (40-41) of IC303
(POWER-AMP) and also
the audio signal R-CH
output to pins (20-21)
and (16-17) of IC303
(POWER-AMP) properly?
NO
Check UR12V power
supply input pins (47)
and (14) of IC303
(POWER-AMP) or
peripheral circuits.
supply input pins (47)
and (14) of IC303
(POWER-AMP) or
peripheral circuits.
Is serial digital signal
(FED7) input to pin(12) of
IC4005(BUFFER)?
(FED7) input to pin(12) of
IC4005(BUFFER)?
YES
Check IC4405(BUFFER)
or peripheral circuit.
or peripheral circuit.
YES
(AV-UNIT)
NO
Is the audio signal of pins
(1),(2),(3) and (4) of P301
(SP-Connector) output
normally ?
(1),(2),(3) and (4) of P301
(SP-Connector) output
normally ?
NO
Check SP- Connetor
(P301) and peripheral
circuits
(P301) and peripheral
circuits
Is the serial digital signal
(FED[7]) output from pin
(43) of IC202 (DVB-T)?
(FED[7]) output from pin
(43) of IC202 (DVB-T)?
YES
Check the connection
between pin (10) of
SC4601 and pin (10) of
P202, or check periph-
eral circuit
between pin (10) of
SC4601 and pin (10) of
P202, or check periph-
eral circuit
YES
NO
Check SP-BOX (right and
left) and WIRE HAR-
NESS.
left) and WIRE HAR-
NESS.
Is the IF(D1/D2) signal
output from pin (17)/(16)
of Tuner (TU201)?
output from pin (17)/(16)
of Tuner (TU201)?
YES
Check IC202(DVB-T) or
peripheral circuit.
peripheral circuit.
NO
Check the B5V/B5V
(CONT)/IF5V power sup-
ply pins (11)/(1)/(3) , SDA/
SCL signal pins (9)/(8) of
Tuner (TU201).
(CONT)/IF5V power sup-
ply pins (11)/(1)/(3) , SDA/
SCL signal pins (9)/(8) of
Tuner (TU201).
YES
Replace Tuner (TU201).
LC-19D1E/S-BK/WH
4 – 6
No sound (2) (during the reception of TV broadcasting)
No audio output during UHF/VHF reception
Checklist:
1) Is the volume set to MIN or MUTE on the remote control?
1) Is the volume set to MIN or MUTE on the remote control?
• • • Set the desired volume.
2) Is ANT-CABLE disconnected or connected improperly?
• • • Connect it correctly as per the operation manual.
(AV-UNIT)
YES
Is the audio signal (L/R) output from pins (34) and (33) of IC501
(AV-SW)?
(AV-SW)?
NO
(MAIN-UNIT)
YES
Is the audio signal (LOUT2/ROUT2) output form pins
(25) and (23) of IC302 (A-CODEC) properly?
(25) and (23) of IC302 (A-CODEC) properly?
NO
Check pins (1) and (4) of IC302 (A-CODEC), pins (11) and (12)
of Connector SC1202,audio-mute line (Q301/Q302) or peripheral
circuits.
of Connector SC1202,audio-mute line (Q301/Q302) or peripheral
circuits.
YES
Is the audio signal L-CH output to pins (44-45) and
(40-41) of IC303 (POWER-AMP) and also the audio
signal R-CH output to pins (21-22) and (16-17) of
IC303 (POWER-AMP) properly?
(40-41) of IC303 (POWER-AMP) and also the audio
signal R-CH output to pins (21-22) and (16-17) of
IC303 (POWER-AMP) properly?
NO
Check UR12V power supply input pins (47) and (14) of IC303
(POWER-AMP) or peripheral circuits.
(POWER-AMP) or peripheral circuits.
YES
Is the audio signal of pins (1), (2), (3) and (4) of P301
(SP-Connector) output normally?
(SP-Connector) output normally?
NO
Check SP- Connector (P301) and peripheral circuits.
YES
Check SP-BOX (right and left) and WIRE HARNESS.
(MAIN-UNIT)
Is the MPX/PC/HDMI_A_L/R signal output to pins (11) and (15)
of IC301 (A-Selector)?
Is the MPX/PC/HDMI_A_L/R signal output to pins (11) and (15)
of IC301 (A-Selector)?
YES
Check either pins (9) and(10) of Connector SC1202 or pins (9)
and(10) of Connector P501. Or check peripheral circuits.
and(10) of Connector P501. Or check peripheral circuits.
NO
Is the audio signal (DVPM2_L/R) output from pins (B23) and
(D23) of IC801 (DVP-M2)?
(D23) of IC801 (DVP-M2)?
YES
Check pins of (6) and (1) of IC301 (A-Selector), pin(14) of power
supply 9V and peripheral circuits.
supply 9V and peripheral circuits.
NO
Is the audio signal (SIF) input to pin (A21) of IC801 (DVP-M2)?
YES
Check the power supply B1.5V pins (C18) and B3.3V pins (A18)/
(A22) are supplied to IC801 (DVP-M2).
Or check peripheral circuits.
(A22) are supplied to IC801 (DVP-M2).
Or check peripheral circuits.
(AV-UNIT)
NO
Is the SIF signal output from pin (12) of Q210(BUFFER)?
YES
Confirm pin (7) of Connector SC1202 or pin (7) of Connector
P501. Or please check the peripheral circuit.
P501. Or please check the peripheral circuit.
Is the SIF signal output from pin (4) of Tuner (TU201)?
YES
Check Q203,Q210 and peripheral circuit.
NO
Check the B5V/B5V(CONT)/IF5V power supply input pin (11)/(1)/
(3) of TUNER (TU201), SDA/SCA signal pins (9)/(8) and AGC
signal pin (15).
(3) of TUNER (TU201), SDA/SCA signal pins (9)/(8) and AGC
signal pin (15).
YES
Replace Tuner (TU201).
LC-19D1E/S-BK/WH
4 – 7
No sound from external input devices (3)-1
No sound from EXT1 (SCART) connecting an external input
device.
<EXT1>
Is SCART-L-IN audio signal input from pin (6) of SCART1 termi-
nal (SC501) to pin (14) of IC501 (AV-SW)?
Is SCART-R-IN audio signal input from pin (2) of SCART1 termi-
nal (SC501) to pin (15) of IC501?
NO
Check pins (6) and (2) of SCART1 and connection to an external
input device.
input device.
YES
Is the audio signal (TERMINAL-L/R) properly output from pins
(34) and (33) of IC501 (AV-SW)?
(34) and (33) of IC501 (AV-SW)?
NO
Check the Power supply input of pin(38) of IC501, or SDA2/SCL2
signal of pins (28) and (29) or peripheral circuits.
signal of pins (28) and (29) or peripheral circuits.
YES
Is the audio signal (LOUT2/ROUT2) output properly from pins
(25) and (23) of IC302 (A-CODEC) ?
(25) and (23) of IC302 (A-CODEC) ?
NO
Check pins (1) and (4) of IC302 (A-CODEC) , pins (11) and (12)
of Connector SC1202, audio-mute line (Q301/Q302) or periph-
eral circuits.
of Connector SC1202, audio-mute line (Q301/Q302) or periph-
eral circuits.
YES
Is the audio signal L-CH output to pins (44-45) and (40-41) of
IC303 (POWER-AMP)? Is the audio signal R-CH output to pins
(20-21) and (16-17) of IC303 (POWER-AMP) normally ?
IC303 (POWER-AMP)? Is the audio signal R-CH output to pins
(20-21) and (16-17) of IC303 (POWER-AMP) normally ?
NO
Check UR12V power supply input pins (47) and (14) of IC303
(POWER-AMP) or peripheral circuits.
(POWER-AMP) or peripheral circuits.
YES
Is the audio signal of pins (1)-(4) of SP-Connector (P301) prop-
erly output?
erly output?
NO
Check SP-CONNECTOR (P301) and short circuit.
YES
Check SP-BOX (right and left) and WIRE HARNESS.