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Sony Trinitron Colour TV, Model KV-29LS3OU The red light continues to flash after switching on. But the picture takes a long time to appear, 3-4 min. The audio comes on promptly. Also the picture quality and colour appear faded. Is it worth repairing? Thank you.

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  • bhaskar_veda Aug 31, 2010

    Thank you. But as a novice to DIY can you give me a bit more instructions on how the solutions have to be implemented. One more thing I forgot to add: even after the picture shows up, the red light contines to keep flashing in intervals of 5 for atleast half an hour. The general picture clarity has worsened, for example during tennis matches when the scores are projected on the screen corner, you can't read it as it is blurred.

  • bhaskar_veda Aug 31, 2010

    Yes

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  • Sony Master
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Sure this is tough one as the model is old. But when the red light flashes the set is powering up and the line output transformer is bringing up the voltage to the CRT stages. The time delay is the decay of the voltage to the circuits mainly due to aging of the components--maybe capacitors- or a possible section of the video-Y board having a series of DRY soldering.
Now you can attempt to see to these issue to evaluate.
First of all one you are confirmed that only when the set warms up the picture starts to come in, then we can simulate the fault by using a hair dryer to warm the suspected parts, mainly try on the section of the Y amp IC and the LOT section.
Checck for a faulty 22mfd or 10mfd with 25o volts capacitor on the LOT secondary to the CRT to be faulty, replace.
This can cause delay and poor picture quality.
Also if the contrast section of the Y amp is faulty you may get this faded situation of picture and colour.
Next use a good soldering iron to touch up the soldering of the
Y/C amp. This can be having poor joints and can be a possible suspect too.
The final part can be the picture tube itself but the fading would have very gradual and with a particular tint in domination.
I hope the tips can get you to work and find a solution.
The Tv is a good one and if the set works it can still give more hours of use.

Posted on Aug 31, 2010

  • Donald DCruz
    Donald DCruz Aug 31, 2010

    There is control named HSTAT on the CRT base and it can be trimmed to obtain a clear image without an out of focus picture.

    The TV has high voltage and sensitive circuits and I would not advice you to look into without any experience for fear of accidental damage to circuit or to you .There is very high voltage and lots of precatuion if your a novice.

    Please take this as my personal advice and seek help.

  • Donald DCruz
    Donald DCruz Aug 31, 2010

    Dont forget to rate me for all the advice.

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