Question about Hitachi 43FWX20B 43" Rear Projection Television

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After installing the two converegence chips,(stk-392-110)the tv powers on for maybe two seconds then shuts off. I took the board back out and checked all solder joints,they were all ok.when powered on I did not see any smoke or sparks, it just goes off after two seconds.All of the resisters appered to look ok,so I did not replace any of them. Any sugestions on what might be wrong or is it time to get a new tv. Thank You very much for any sugestions.

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Yes - You most likely created a short by soldering the convergence chip pins together. Go back over your soldering and fix any bad spots. No two pins should be touching.


Posted on Jun 20, 2009


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Check your soldering. Check the vertical power board on the far left when looking from the back. It has fuses on it as well.

Depending on quality of STK chips, they could have been bad or failed right away. Best things is to look at the schematic, verify what colors you can move and see which STK chip is not functioning.

If both chips are not function after replacement, likely a fuse. Be sure to verify the resistors next to the STK chips.

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Turns on and within a second goes out

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check this out I have the same problem check your solder spot make sure the solder points are not touching one another, that could be one of the reason is doing this or just to make sure you can desolder the stk chips clean the holes where the pins go trough the board and power the tv with board and if the tv start fine if could be bad stk chips be very careful when desoldering or soldering good luck about another is not worth it they cost too much around 350-450

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STK chips didn't fix my problem

You probably have a bad cap in the horizontal sync circuit. I'll check with mhy Pioneer contact for more details. Stay tuned...


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# flashes in a panasonic means the convergence amps have failed. You will need to replace both convergence ICs numbers STK392-110 you can get replacement ICs at the following link and they include free instalation instructions with pics so you can do the repair yourself and save about 400.00 Heres the link you will need two ICs.

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It looks more like an open solder because you were able to align it properly after replacing the STK ICs, if there was an open resistor(s) you would not be able to get it align.
I would suggest to go back and double check the solder joints on the STK ICs as well add some fresh solder to the resistors nearby the stk392-180.
Good Luck.

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SD533HD5 Blowing Fuses

No lo creo ,ya que el problema puede ser el circuito horizontal checalo o manda la tv a un taller.

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1 Answer

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no sundog this model has the potenthal to be a nice tv when you saw the burn't resisters that was your clue to change the stk's now that you have fixed the res problem the bad stk is telling the set to shut down replace stk,s i ALWAYS change both (buy the way in the future those are hi watt res THEY SMOKED FOR A REASON maybe you thought they were installed in the 70"s ha ha. but they smoked because the stk's one or more are bad. good luck doc

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