Question about Mitsubishi WT-46809 46" Rear Projection Television

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I have a Mitsu WT-46805. The convergence IC has gone out.

I understand the the replace part is a STK392-040. The only similar part I can find in town is a NTE7178. Are these part compatible?

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  • keldodgs Dec 31, 2008

    I have

  • keldodgs Dec 31, 2008

    I have the same convergence problem - I am looking for directions on accessing the IC chips, process to identify which on is defective, and how to replace.. is there a document that I can read, additionally some functional diagram/schematic that I can look at to find the chips in questions? Thank you very much..

  • kelly_small Dec 31, 2008

    I have the same convergence problem - I am looking for directions on accessing the IC chips, process to identify which on is defective, and how to replace.. is there a document that I can read, additionally some functional diagram/schematic that I can look at to find the chips in questions? Thank you very much..

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I wouldn't use a generic replacement part, use only original OEM ( cost is about $25,00 each) you can check at Electonic Part Cos such as Pan-Son or Dalbany and( there's a big Commpany down in Miami, sorry I can't remember the name of it) and make sure you clean off the heat sink grease ( white pasty stuff ) and replace it with a sufficent amount of new grease, these IC's disapate lots of heat and that what causes early failure

Posted on Dec 28, 2008

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There are two and sometimes three very large IC’s that control the convergence in a big screen set. I think that you have two that are on the board in the center of the set. They are secured to a very large aluminum heat sink.

There are two ways to repair intermittent connections on the convergence IC’s. I usually remove the board with the convergence IC’s on them and then and solder the connections. The other method is to tilt the circuit board and solder them while still installed in the chassis.

If you remove the board and repair the connections, be careful to remember which connections need to be made when you replace the board. Mitsubishi uses a lettering system, so it should be easy.

If the problem remains after you have made the repair, it is possible that the pins on the IC’s have become loose. In this case the IC’s need to be replaced. I have seen this on several occasions.

If you choose to repair the set yourself, be very careful of the high voltage that can be stored in the capacitors, and CRT’s. This voltage can be as high as 30,000 volts.


I hope this information allows you to resolve this issue.
If I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up) If you cant rate this post with the highest rating, then please comment to this post and I will try to help you further.

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regards
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Good Day, Corri;

It sounds like the TV has a Circuit problem in the convergence circuit. If it comes and goes then the concern can be corrected by re-soldering the 'conv' output IC"s. A semi-minor repair and cost.

Good Luck, big IRISH.

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