DOWNLOAD Sharp LC-19D1EWH (serv.man5) Service Manual ↓ Size: 1.14 MB | Pages: 24 in PDF or view online for FREE

Model
LC-19D1EWH (serv.man5)
Pages
24
Size
1.14 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Troubleshooting Table
File
lc-19d1ewh-sm5.pdf
Date
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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.
YES
Is the audio signal (TERMINAL-L/R) properly output from pins 
(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.
YES
Is the audio signal (LOUT2/ROUT2)  output properly from pins 
(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. 
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 ?  
NO
Check UR12V power supply input pins (47) and (14) of  IC303 
(POWER-AMP) or peripheral circuits.
YES
Is the audio signal of pins (1)-(4) of  SP-Connector (P301)  prop-
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)? 
NO
Check Connector SC1202 pins (9) and (10), Connector SC501 
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)? 
NO
Check the Power supply input of pin(38) of IC501, or SDA2/SCL2 
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) ?  
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. 
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 ?    
NO
Check UR12V power supply input pins (47) and (14) of  IC303 
(POWER-AMP) or peripheral circuits. 
YES
Is the audio signal of pins (1)-(4) of  SP-Connector (P301)  prop-
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)? 
NO
Check Connector SC1202 pins (9) and (10), Connector SC501 
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)? 
NO
Check the Power supply input of pin(38) of IC501, or SDA2/SCL2 
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) ?   
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. 
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 ?     
NO
Check UR12V power supply input pins (47) and (14) of  IC303 
(POWER-AMP) or peripheral circuits.  
YES
Is the audio signal of pins (1)-(4) of  SP-Connector (P301)  prop-
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 – 10
No sound except from speakers (4)-1
                                            
No audio output from headphone (J505).
(AV-UNIT)                             
Is there audio output signal on pins (2) and (3) of the headphone 
terminal (J505)?
YES
Check Headphone terminal (J505) and the connection to an 
external device.
NO
Is “H” signal at base of Q527, Q526? 
YES
Pin (D11) of IC801 (DVP-M2) should usually be “L”.
If “H” signal, check IC801 and peripheral circuits.
(MAIN-UNIT)                         
NO
Is the audio output signal of pins (30) and (29) of IC302 (A-
CODEC) proper? 
YES
Check pins (12) and (11) of Connector SC1203, pins (12) and 
(11) of Connector P502 and peripheral circuits.
(AV-UNIT)                             
NO
Is the audio output signal (TERMINAL-L/R) properly output from 
pins (34) and (33) of IC501 (AV-SW)?
YES
Check pins (11) and (12) of Connector SC1202, pins (11) and 
(12) of Connector P501 and peripheral circuits.
(MAIN-UNIT)                         
NO
Is the audio output signal (MPX-A-L/R) properly output from pins 
(11) and (15) of IC301 (A-Selector)?
YES
Check pins (9) and (10) of Connector SC1202, pins (9) and (10) 
of Connector P501 and peripheral circuits.
NO
Is the audio output signal (DVPM2-L/R) properly output from pins 
(B23) and (D23) of IC801 (DVP-M2)? 
YES
Check the AUDIO signal line between IC301 and IC801, or 
peripheral circuits.
NO
Check the power supply input B3.3V pins (R19) and (D5), B1.5V 
pins (D12) of IC801 (DVP-M2) or peripheral circuits.
No sound except from speakers (4)-2
                                             
No audio output from EXT1 (SCART1) terminal.
                                             
Checklist:
1) Is the MUTE button on the remote control set to ON? 
• • • Set to OFF.
2) Check the connection to external devices. 
• • • Is there any improper connection?
                                             
Is audio signal output to pins (3) and (1) of EXT1 (SC501)?
YES
Confirm EXT1 (SC501) and the connection to an external eivice.
NO
Is the audio output signal (L/R-OUT) output to pins (7) and (1) of 
IC506 (A-AMP)? 
NO
Is the audio output signal (DVPM2-L/R) properly output from pins 
(B23) and (D23) of IC801 (DVP-M2)? 
YES
Check pins (20) and (21) of Connector SC1202, pins (20) and 
(21) of Connector P501 and peripheral circuits.
NO
Check the power supply B3.3V pins (R19) and (D5), B1.5V pins 
(D12) of IC801 (DVP-M2) or peripheral circuits.
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