Sony Grand WEGA KF-42SX300 42" LCD TV Logo

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Anonymous Posted on Dec 16, 2010

When I use the remote control for instance to turn up the sound the green and red lights flash alternately and the sound turns up to maximum, the inverse happens if I turn the sound down. Same problem on channel changing button, menu options etc. It seems as if the remote command is continuously actioned again and again. Have changed batteries in remote, tried using my Sky remote in TV mode and the same happens so I guess it must be in the TV. Have tried repowering the set

  • 2 more comments 
  • Anonymous Dec 19, 2010

    No the on-set controls work fine

  • Anonymous Dec 19, 2010

    Is this at the top right corner of the set, do you have any info. on name and/or Sony part number for the replacement part please?

  • Anonymous Dec 19, 2010

    Is the sensor possible to replace, I have desoldering equipment and skills do you know if it's a part that Maplins or RS Compunents may stock? Is there a circuit diagram available of this circuitry?

  • Anonymous Dec 19, 2010

    Ok great thanks for the good response, I will give them a call tomorrow, what time zone are they in as I am in France

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  • Master 4,889 Answers
  • Posted on Dec 18, 2010
Anonymous
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If this is happening with different remotes, then the first thing I would verify is whether its an IR sensor issue. Does the same thing happen when you are using the front panel controls on the tv?

  • 2 more comments 
  • Anonymous Dec 19, 2010

    Confirmed case of faulty IR sensor then. The input board at the front holds the sensor and it has to be replaced to resolve the problem.

  • Anonymous Dec 19, 2010

    Given the fact that this set is rather old, it is very difficult to find a replacement board from a third-party source. You will have to contact sony for that. The input board is the one that all the buttons on the front panel are connected to. It also has the IR sensor that is the source of the problem.

  • Anonymous Dec 19, 2010

    These are embedded circuits. See this image
    http://www.usefulparts.com/images/002326...
    The board costs about 15$. So even if it was possible, the cost of the sensor would be more than the cost of the board itself. So your best bet would be to contact sony for a replacement part. Call them at
    1-239-768-7691

  • Anonymous Dec 19, 2010

    If you are in France then the number is
    01 55 90 34 34
    Timings are 10AM to 5PM local time

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