DOWNLOAD Sharp LC-37LE320E Service Manual ↓ Size: 40.22 MB | Pages: 127 in PDF or view online for FREE

Model
LC-37LE320E
Pages
127
Size
40.22 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
lc-37le320e.pdf
Date
PREV: Sharp LC-37HV4EB (serv.man4) Service Manual / Technical Bulletin

Sharp LC-37LE320E Service Manual ▷ View online

         2008-03-14 
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320 
 53 
The sound is not emitted from the speaker though the picture has come out. 
↓ 
No sound output in all modes?
 
TEREMINAL UNIT:
   
    ↓ 
 
 
↓YES 
 
 
↓YES 
 
 
↓YES 
 
 
↓YES 
 
 
 
 
 
 
 
Is the audio signal output of pin (U36)(AR3), (V37)(AL3) of IC U401 
normal? 
NO 
 
Check IC U401 and its peripheral circuits.
Is audio signal input to pin (4)(LINN), pin (11)(RINN) of IC U601 
(AMP)?
 
NO 
 
Check the line between IC U605 and IC U601.
Is MUTE circuit [ Shutdown, OFF_MUTE] normal?
 
Is the audio signal output of pin (3, 4) (L-ch) and pin (1, 2) (R-ch) of 
CN601 (AOUDIO-CONNECTOR) normal? 
NO 
 
Check the Mute circuit. (Q601, Q602 etc.) 
Check IC U601 and its peripheral circuits.
Check Speaker Box (right and left) and wire harness.
 
NO 
 
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320 
54  
No sound (during the reception of  TV broadcasting) 
↓ 
Does not the sound go out though the picture has come out when TV is received?
 
MAIN UNIT:
  
 
    ↓ 
 
 
↓YES 
 
 
↓YES 
 
 
 
 
No sound from external input devices (1)
 
↓ 
Does not the sound of the audio signal input to SCART1 go out?
 
TEREMINAL UNIT:
   
    ↓ 
 
 
↓YES 
 
 
↓YES 
 
 
 
 
No sound from external input devices (2) 
↓ 
Does not the sound of the audio signal input to AV1 (Component) go out?
 
MAIN UNIT:
  
 
    ↓ 
 
 
↓YES 
 
 
↓YES 
 
 
 
 
 
 
 
 
 
 
Is the IF signal output from pin (16) and pin (17) of TUNER 
(TU102)?
 
NO 
 
Check the tuner and its peripheral circuits. Replace as required.
Refer to “No sound output in all modes”.
 
Is the audio signal properly sent to pin (6)(SCT1_AUL_IN) and pin 
(2)(SCT1_AUR_IN) of SCART1 (CN151)?
Check the setting of an external input device that connects of 
CN151
NO 
 
Is the audio signal properly sent to pin (AA32) and pin (AB33) of IC 
U401?
 
NO 
 
Check the line between CN151 and IC U401
Refer to “No sound output in all modes”.
 
Is the audio signal properly sent to pin (2)(AV1_AudioLIN) and pin 
(4)(AV1_AudioRIN) of CN116?
 
NO 
 
Check the connection to CN116 and the external input device.
Refer to “No sound output in all modes”.
 
Is the audio signal properly sent to pin (AD33) and pin (AC34) of IC 
U401?
 
NO 
 
Check the line between CN116 and IC U401.
Is the IF signal sent to pin (AH35) and pin (AH37) of IC U401?
NO 
 
Check IC U401 its peripheral circuits.
 
         2008-03-14 
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320 
 55 
No sound from external input devices (3)
 
↓ 
Does not the sound of the audio signal input to AV3(Composite) go out?
 
MAIN UNIT:
  
 
    ↓ 
 
 
↓YES 
 
 
↓YES 
 
 
 
 
No sound from external input devices (4) 
↓ 
Does not the sound of the audio signal input to VGA go out?
 
MAIN UNIT:
  
 
    ↓ 
 
 
↓YES 
 
 
↓YES 
 
 
 
 
No sound from external input devices (5) 
↓ 
Does not the sound of the audio signal input to HDMI go out?
 
↓ 
 
 
↓YES 
 
 
 
 
 
 
 
 
 
 
Is the audio signal properly sent to pin (4)(AV3_AudioLIN) and pin 
(6)(AV3_AudioRIN) of CN136?
 
NO 
 
Check the connection to CN136 and the external input device.
Refer to “No sound output in all modes”.
 
Is the audio signal properly sent to pin (AD35) and pin (AB35) of IC 
U401?
 
NO 
 
Check the line between CN136 and IC U401.
Is the audio signal properly sent to pin (2)(VGA_AudioLIN) and pin 
(3)(VGA_AudioRIN) of CN102?
 
NO 
 
Check the connection to CN102 and the external input device.
Refer to “No sound output in all modes”.
 
Is the audio signal properly sent to pin (AA36) and pin (Y37) of IC 
U401?
 
NO 
 
Check the line between CN102 and IC U401.
Refer to “No sound output in all modes”.
 
Is picture of the signal input from HDMI displayed?
 
NO 
 
Refer to “Does not the picture of the HDMI signal input to HDMI 
go out?”.
 
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320 
56  
The audio signal is not output (1) 
↓ 
The audio signal of UHF/VHF is not output from SCART1.
 
TEREMINAL UNIT:
   
    ↓ 
 
 
 
↓NO 
 
 
↓NO 
 
 
 
The audio signal is not output (2) 
↓ 
No audio signal output from LINE_AUDIO_OUTPUT terminal.
 
TEREMINAL UNIT:
   
    ↓ 
 
 
 
↓NO 
 
 
↓NO 
 
 
 
 
The audio signal is not output (3) 
↓ 
No audio signal output from SPDIF_OUTPUT terminal.
 
TEREMINAL UNIT:
   
    ↓ 
 
 
↓NO 
 
 
 
 
 
 
 
 
 
Is audio signal output from IC U401 is sent to pin (2) (1IN-) and pin 
(6) (2IN-)of IC U106? 
Is audio signal output from IC U106 sent to pin 
(3)(SCT1_AUL_OUT) and pin(1)(SCT1_AUR_OUT) of 
SCART1(CN151)?
 
YES 
 
Check the connection to SCART1 and external devices.
YES 
 
Check the line between IC U401 and IC U106.
Check IC U401 and its peripheral circuits.
Is audio signal output from IC U401 is sent to pin (2) (1IN-) and pin 
(6) (2IN-)of IC U107? 
Is audio signal output from IC U107 sent to 
pin(4)(Audio_Line_Out_L) and pin (6)(Audio_Line_Out_R) of 
LINE_AUDIO_OUT connector(CN140)?
 
YES 
 
Check the connection to LINE_AUDIO_OUT and external 
devices.
 
YES 
 
Check the line between IC U401 and IC U107.
Check IC U401 and its peripheral circuits.
Check IC U401 and its peripheral circuits.
Is ASPDIF audio signal output from pin (K33) of IC U401 to pin (6) 
of connector CN116?
 
YES 
 
Check the connection to SPDIF_OUT and external devices.
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