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No sound on tv switch positon. works on dvd

I can unplug and plug back in and sound will sometime come back onfor a while................

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  • tantiques Feb 28, 2009

    I can unplug like you said and it doesn't come on all the time and when it does it cuts off. I also can turn on cd and the back to to tv sometime and it might work. CD sound works good. I am tech. and it seems to be in mute ckt. May be a common trouble with this unit. I don't have diagram for unit.

  • tantiques Feb 28, 2009

    fuse is good

  • tantiques Feb 28, 2009

    Yes I agree with the mute theory. Have you had any other reports of this problem with this model? Boards are expensive. Is ther switching tr or ic that can be changed?

  • tantiques Feb 28, 2009

    I have checked everything on ckt. board.everything seems ok. Where do I get ckt board for coby. Do you have address of co.?

  • tantiques Feb 28, 2009

    Sound works on everything but tv. Don't think its ic

  • tantiques Feb 28, 2009

    radio shack does not carry parts i need. Give me mfg. web. site

  • tantiques Feb 28, 2009

    resistors don't short out. they burn up or open up. some time this tv will work for hours. It looks like theres a lot of guessing going on here. i need factory parts location

  • tantiques Feb 28, 2009

    tv is almost new. nothing worn out

  • tantiques Feb 28, 2009

    tv picture is perfect. all chans work good and snow free

  • tantiques Feb 28, 2009

    i need to talk to tech. that knows something about coby tv sound. everything i have received so far is general info. which i tried before i contacted you

  • tantiques Feb 28, 2009

    Resistors that are burned can be seen and the ones you say are shorted turn to charcol. I was in business before you were born. You need to admit you don't know anything about this tv and quit wasting my time.

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What is the make and model #??

Posted on Mar 01, 2009

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I've searched the following and have to tell you support for Coby Repair seems impossible to find.
I wouldn't waste any more time.
It appears as though Coby is built not to be repaired but replaced. It's a shame. If I'm wrong and anyone can find support for repair or even service I would love to hear from them.
For now Coby goes into my Poor Support File (No phone #, no offer of substaintal repairs).

Failed to Find Necessary Support at the following sites....
Coby Support @ http://www.cobyusa.com/?p=doc
Coby Parts & Accessories @ Fox International @ 800-321-6993

Electronic Parts @ http://www.partstore.com

jackiaria

Posted on Feb 28, 2009

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  • 58 Answers

Ur cables mights be worn out form to much movement and usage or u could have a bad connection replace the cables first and then chek ur conecctions

Posted on Feb 28, 2009

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Hello, it sounds as if you are having a problem with sound coming out of your tv after awhile. It sounds like there is a resistor heating up and shorting out after it gets hot.There may also be something wrong with the printed circuit board it too can get hot and short out. thank you

Posted on Feb 28, 2009

  • suterman
    suterman Feb 28, 2009

    Correction risistors do burn up but the can produce enough heat to short out on a printed circuit board. I guess you have never run into that so you need to quit talking about someone guessing.

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  • 326 Answers

Yes there is sound ic located on the main board if its gone weak this problem happens sometime. you can get the parts from www.radioshack.com

Posted on Feb 28, 2009

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Its the problem of tv cable connection it has bad signal try to rescan channels.

Posted on Feb 28, 2009

  • Teet Bergmann Feb 28, 2009

    try to fine tune the channels or manual rescan

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Check out the audio circuit and ic on the main board that will be loose internally or got weak.

Posted on Feb 28, 2009

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It is not in mute, the mute on audio circuit will be the same if you use DVD or Tuner.
It is also not a problem with audio circuit, as that would affect all signals.

If it is mute with an external receiver, then it is either a cable/connectors problem, a bad receiver, or a bad input board on TV.

If instead has no sound with only an antenna attached, then the fault is on tuner board or on tuner circuits.

If the TV has an internal tuner board, then you can replace the board.

If you want to repair the TV working at component level, you will better buy the service manual for your model.

You can buy service manual and replacement entering your make and model details here.

Posted on Feb 28, 2009

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  • 113 Answers

Hi there,
check out the internal fuse of TV. and let us know the result.

Good Luck!!!

neo

Posted on Feb 28, 2009

  • nenotech_neo Feb 28, 2009

    ok....plug a jack in to the audio port and remove it after plugin.
    some time audio jack pins push down, cause no audio.

  • nenotech_neo Feb 28, 2009

    yes..... if further you have the same problem, means its a time to call a repair person so time to change the sound IC.

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Try reset .

Unplug the unit from power chord for 30 minutes and plug back the power chord to the unit .
This will reset your unit .


Posted on Feb 28, 2009

  • SAM ANDERSON Mar 01, 2009

    You need to provide model details of your tv .


    You can get parts for your tv by checking the part number from the link below

    Parts for coby tv





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