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Discussion in 'Troubleshooting and Repair' started by RENWICK, Jul 5, 2015.

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  1. RENWICK

    RENWICK

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    Jul 5, 2015
    Hi there , i have a LG home theater and the audio cuts off in 2 or 3 seconds. and every time i switch audio modes the sound comes and goes off. can someone help me to fix this issue.
     
  2. davenn

    davenn Moderator

    13,435
    1,807
    Sep 5, 2009
    give us more info ... make model etc
    and never multipost same thing in different threads
     
  3. RENWICK

    RENWICK

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    Jul 5, 2015
    MAKE LG DVD RECEIVER
    MODEL : LH-T96561A
     
  4. Martaine2005

    Martaine2005

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    681
    May 12, 2015
    Hi Renwick,
    Have you checked the obvious first?
    Like speaker connections tight and in some cases polarity.
    Especially no loose wire strands shorting either terminals?
    Check and double check these.
    A loose strand can almost be hair strand size (wire dependant).
    Take your time and undo each terminal, twist strands properly and terminate again.

    Martin
     
  5. davenn

    davenn Moderator

    13,435
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    Sep 5, 2009
    have you looked for a schematic or service manual online ?
    are both channels cutting out or just one

    and what do you mean by this ? ....
    what audio modes ?

    do you have any electronics experience ?
    do you have any test gear ... multimeter, oscilloscope ?


    Dave
     
  6. Martaine2005

    Martaine2005

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    May 12, 2015
    Hi Dave, not really sure either. But assume CD, TAPE, AUX, PHONO for us old guys!!!!!
    So swittching between inputs has not shorted.
    Sound for a second before interrupts. O/P sounds fine. Just some interrupt protection before all outputs. May be?
     
  7. davenn

    davenn Moderator

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    Sep 5, 2009
    possibly ??
     
  8. Martaine2005

    Martaine2005

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    May 12, 2015
    Sorry Dave,
    Just giving an idea for audio modes as OP.
    I/we call them inputs or outputs.
    I was just trying to help the OP to better explain him/herself.
    I am certainly not questioning /asking you!!!!

    Sorry, Had to edit this because I didn't explain myself in my post.
    Martin
     
    Last edited: Jul 5, 2015
  9. davenn

    davenn Moderator

    13,435
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    Sep 5, 2009
    you have nothing to be sorry about
    I was agreeing with you as in possibly that's the problem ??



    D
     
  10. Martaine2005

    Martaine2005

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    May 12, 2015
    OKey dokey. Thanks.
     
  11. RENWICK

    RENWICK

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    Jul 5, 2015
    i have uploaded some pics of the model number and the remote too. on the remote you can see a button as XTS pro, when i press that the audio comes and again in few seconds it goes off and when i use that same button to change modes it keeps coming on and off.
     

    Attached Files:

  12. Martaine2005

    Martaine2005

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    681
    May 12, 2015
    Hi Renwick,
    A couple more questions..
    Do you have the user manual? Because it appears that the XTS button changes to channel 2 or something like that.
    Do you have all the speakers connected? Front, rear and centre.
    Are the speakers the correct impedence for the amp. 4-8 ohms?

    If you power the unit on, will it stay on and play normally until you press XTS button?
    Can you provide exactly what is happening, does the leds stay on?
    When audio goes off is there any clicking heard from the amp etc etc.

    Martin
     
  13. RENWICK

    RENWICK

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    0
    Jul 5, 2015
    i don't have the manual, i got all the speakers connected, and all the speakers are at the right amp. the power stays on while the audio only cuts off. the moment i switch the system on the audio starts and cuts off in 2 seconds but the system stays on. but there is some humming noise from the speakers.the leds stays on too.there is no clicking noise.
     
  14. Martaine2005

    Martaine2005

    2,538
    681
    May 12, 2015
    Have you got tools to check voltages? multimeter? etc.
    I'll try and upload the service manual here.
    Maybe someone can help with that.
    I initially thought the protect mode was kicking in but the relays should have cut power to the speakers. Until you said there is still a hum.
    Might also be a power supply problem. So we will have to do some checking from the service manual if you can follow on?

    Martin
     
  15. Martaine2005

    Martaine2005

    2,538
    681
    May 12, 2015
    The pdf is too large to upload here.
    But this is a snippet..

    (* Depending on the sound mode
    settings and the source, there may
    be no sound output.)

    I suggest looking for the user manual.

    Martin
     
  16. Alec_t

    Alec_t

    2,735
    724
    Jul 7, 2015
    Some amplifiers (I don't know about yours) have an anti-thump muting circuit to protect the speakers at power-on. This often involves a high value capacitor charging up over a second or two during power-up. Clutching at straws here, but if this cap has gone leaky perhaps it subsequently discharges and mutes the amp again.
     
  17. RENWICK

    RENWICK

    5
    0
    Jul 5, 2015
    can you send me the link for the service manual and ill try to do as advised. i have a multimeter but im not too familiar with it.
     
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