Sharp LC-19D1EWH (serv.man5) Service Manual ▷ View online
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.
LC-19D1E/S-BK/WH
4 – 8
No sound from external input devices (3)-2
No sound from EXT4 (MDMI-AUDIO) connecting an external
input device.
<EXT4>
Is HDMI-L audio signal input from J504 to pin (8) of IC301 (A-
Selector)?
Is HDMI-R audio signal input from J504 to pin (5) of IC301 (A-
Selector)?
YES
Is HDMI-L audio signal input to pin (42) of IC501 (AV-SW)?
Is HDMI-R audio signal input to pin (40) of IC501 (AV-SW)?
Is HDMI-R audio signal input to pin (40) of IC501 (AV-SW)?
NO
Check Connector SC1202 pins (9) and (10), Connector SC501
pins (9) and (10) and short circuit.
pins (9) and (10) and short circuit.
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.
LC-19D1E/S-BK/WH
4 – 9
No sound from external input devices (3)-3
No sound from EXT5 (AUDIO) connecting an external input
device.
<EXT5>
Is PC-S-L audio signal input from J401 to pin (7) of IC301?
Is PC-S-R audio signal input from J401 to pin (3) of IC301?
YES
Is PC-S-L audio signal input to pin (42) of IC501 (AV-SW)?
Is PC-S-R audio signal input to pin (40) of IC501 (AV-SW)?
Is PC-S-R audio signal input to pin (40) of IC501 (AV-SW)?
NO
Check Connector SC1202 pins (9) and (10), Connector SC501
pins (9) and (10) and short circuit.
pins (9) and (10) and short circuit.
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.
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