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Question about Toshiba 57H81 57" Rear Projection Television

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Still has same problem after replacing convergence IC's

Waited 6 weeks for IC's but gave up and got them from another supplier. Replaced two fuses 5 amp and 2 amp and then IC's reinstalled in set made all connections and Joila same problem. Think fuses blew again and back to power on led cycling on and off. May give up soon but not yet.

Posted by Anonymous on

  • Anonymous Dec 11, 2006

    Same fuses blown. Something other than STK390 IC's causing high current to flow and blow fuses.

  • Anonymous Jan 20, 2007

    Close this thread. Solved in another.

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Solution at hand..john

Posted on Sep 12, 2007

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Color convergence

find the change value capacitors and resistors in the convergence section!
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You would probably have to recalibrate the convergence after you install the IC. There may be a convergence kit available as well.
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Hi there, i have an old Philips 43pp925/79 rear projection tv. A few weeks ago convergence ic went bad, so i replaced them both and i replaced 6 resistors. Now there is no bending on the screen but...

You will have to go into Service Menu to realine convergences and What was the STKs numbers you replaced/ and did you go with same part number?I think i have service code for this set will have to look thur my files.
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Picture flickers in and out rapidly,gets blurry for about 5sec then looks like new for about 5sec then back again

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Replaced two convergence ic ;now have code 6 .what is the problem,and how can i fix.

I would suspect that a fuse or two is open or a low valued resistor is open. Can you please post the make and model of the set?

Thanks,
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Replaced STK ICs but image is all distorted

Usaly when this happens the little fuses also fry they are 5 amp and located neer the ic's and at the bottom right of each ic, also they are green and look like a restor could check and see if they are open and then check all the big resistor to see if any of those show open, other than that I will paste my standard fix for this set
Everybody here seems to have basically the same problem so I will write a general fix for these Samsungs. First what you got is known as Convergence failure, A Ic or resistor, fuse or some other component has failed in the convergence circuit. So finding the service menu and trying to align the colors or spinning magnets on the CRT’s or a real bad idea of tipping a CRT or mirror would be the equitant of ripping the transmission out of your car because it had a flat tire. When the convergence fails no adjustment will bring it back, and if you do one of these stupid things then you have two problems. Now most of these Samsungs have an easily replicable board that all the convergence amplifiers are on. This can be found by removing the back and seeing if there is a board about 9 X 5 inches big and mounted to the CRT mounts, there will be 5 connector to this board. Now if your set does not have this board and instead has the two convergence Ic’s (these are about the size of a playing card and have the numbers STK392-040 on them) mount down on a board below and to the right ( this is known as the deflection board) this repair will not work for you. Instead you will need to component level repair the convergence circuit. But if you do have this separate convergence board the repair is fairly straight forward. Go to www.vancebaldwin.com or some other supplier and order BP95-00142E this is the convergence board. This board has been crossed several times through the years but this is the current version. Now once you get this board simply replace it making sure to get al the connector back in there original spot. The fire up the set and run Flash focus and for about 95% this will fix the set
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Toshiba 42H81 Rear projection "Convergence problem"

Also,check micro fuses F851,F852,etc.
and with a good digital meter, check resistors feeding B+ to
convergence circuit.
I have been using Stk392-110T made by Toshiba with no re-calls.Hitachi also has an upgrade IC.
And be sure to check your soldering of IC pins--good connect,
with no short.....T.
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