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TV picture vertical drift.

Cold-start, picture OK. Later, picture drifts slowly upwards off screen.

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  • ronpate Oct 07, 2008

    I will apply the solution offered.

    Thanks.

  • ronpate Oct 07, 2008

    The entry form would not accept my make/model data. Why?



    Anyway, the TV is a Sony Trinitron (not a flat panel...my mistake), Model KV-27S26, made in 1997.

  • ronpate Oct 07, 2008

    Thank you for your guidance. Yes, I have the necessary experience: as a design engineer, I've worked in all phases of low-voltage circuit development including PCB design, fabrication, assembly, and testing.



    TV's and high-voltage work have not been my experience.



    I have gotten the service manual and board layouts for the Sony KV27S26 from an internet source.

  • ronpate Oct 09, 2008

    Thank you for your advice. I will begin work on the TV this weekend, so I will get back to you sometime next week or maybe later depending on parts delivery.











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Give us the brand of your tv.
You will find help here:

http://www.repairfaq.org/sam/tvfaq.htm

Posted on Oct 07, 2008

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Symptoms shows weak capacitors in deflection circuit.
Please mention model and brand of your TV.
How old is your TV?
Thank you.

Posted on Oct 07, 2008

  • Shahid Electronics
    Shahid Electronics Oct 07, 2008

    OK, so it is Sony KV-27S26
    Please let me know do you have electronics knowledge and some know-how of solder work like recognize and replacement of electronics parts to provide you further information to resolve it.
    I also want to know do you have service manual of subject TV? because it would be easy for you to locate identified / suspected parts in main board or I need to guide you here by pictures.
    Thank you.



  • Shahid Electronics
    Shahid Electronics Oct 07, 2008

    That's great, being an engineer you have more knowledge then me, please check weak electrolytic capacitors in horizontal and vertical deflection area and power supply of tv. As you know after along run solder joints got some kind of dryness and couldn't make proper connections between PCB and mounted part, so re-soldering such cold solder joints is good idea.
    You have service manual and it is enough to identify parts location, getting part numbers of defective or suspected parts with description etc.
    I hope tv problem will resolve as its not so complicated tv as compare to current models.
    Thank you.


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