Question about Sony KV-XJ29M50 29" TV

2 Answers

Sony kv xj29m50 no picture.

Dear experts,
the sony tv xj29m50 lost picture with two blinks. replacing the h out with bu2520df make picture with normal sound until the picture mode change to dynamic mode. which makes the picture to shift to left side and the set to
stop with two blinks again[ h out still ok]. checked abl, akb and soldered all pc board make no difference.pls solve the problem at your earliest convenience.
best regards,
henry than myint.

Posted by on

  • henrytechMO Feb 03, 2008

    Dear Mergatroid,

    thanks for your attention. there is picture mode

    settings for this tv, dynamic mode set the contrast to max: automatically. by the help of your solution, i checked all resistors and found R615, which is in the line of B+ supply to Hout is high ohm. this makes the OCP transistor to conduct and

    cutoff the AFC line to shift the picture before shutting down the set.thanks again for your solution. I would like to rate your solution very helpful.

  • henrytechMO Feb 23, 2008

    dear sir,

    sorry for late rating of this very helpful solution. our e.mail line are barred so i have to use ultra surf for this rating.thanks again and god bless you.

    best regards.




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Hi all,

I need a service manual for this model (kv xj29m50).

Anyone have the copy??

Posted on May 08, 2008

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If I understand you correctly:
The horizontal output transistor in your TV blew.

You replaced it with a BU2520DF.

I'm not sure what you mean by "change to dynamic mode".

Dynamic what?

Usually, horizontal problems in TVs are caused by bad capacitors in either the sync circuit, the driver circuit, the geometry circuit or the output circuit.

When I repsir problems like this I use an oscilliscope to find which stage is not working properly, then start substituting the capacitors in that stage until the problem is solved.

Look for large orange or blue ceramic or polyprop capacitors with bulges or cracks in them.

Look for electrolytic capacitors with bulging tops or shrunk cases.

Check and make sure no resistors are brown, they may be blown.

Use an ohm meter to test low value resistors in circuit.

If you don't have an oscilliscopw, that's about all you can do.

Posted on Jan 31, 2008


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