Question about Toshiba 40H80 40" Rear Projection Television

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Toshiba 40pw13p projector ic query

Can anyone give me some advice on convergence amp upgrades. My rear projection t.v. currently has STK392-110 ic's, but I bought a set of STK392-140 ic's (Sellers mistake) I was going to send them back for the right one's, but can I use the STK392-140 ic's in my machine? Thanks to all in advance.

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  • Steven Butler Apr 05, 2008

    Thanks very much. These are Sanyo, so no worries there! I'll send them right back.

  • Uldis Aug 24, 2008

    Hi, I came across your post in trying to find a solution to a similar problem.

    I have the same Toshiba 40PW13 retroprojection TV and the convergence is onlyOk in the middle of the screen, but no matter how I move the adjustment, the extremes (all 4) are way out.

    I have never openbed the TV and see you gys are already talking about faulty IC's. I was thinking may be it was a case of moving some pots inside.

    Any pointers on how to fix this and where to find the faulty items? Seems like a big waste to throw away an otherwise good TV just because of this.


    Uldis Tretmanis (Scotland)



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  • 934 Answers

NO - - clearly not 140's.... You can upgrade Q751 & Q752 to 150's or 180's which merely have higher amp ratings and thus more reliable.
Also, make really sure that the "seller" you got these from isn't selling you chineese knock offs. They are common in this industry and they may not last ten minutes in your Tv. I suggest some place like ACME out of Florida
where you will be assured of getting Sanyo original Ic's and not some chineese look-a-like.
Also, make sure to test the 3.3 ohm return and low ohm feed resistors in the convergence circuit when you replace the amps. You may find one or more resistors in the return changed in value or open so I would suggest buying a package of those also (10 in a pack).

Posted on Apr 05, 2008


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42H83 Convergence

Yes the convergence ICs need to be replaced, however so dont the six 1.8 ohm 1watt resistors as Toshiba recomends replacing those six resistors when the ICs are changed. You can get the 50H71 / 50H82 Convergence repair kit as the 42H83 is identical to the 50H71 series, so the kit will work for your model. Heres the link where you can get the kit.

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I do wish people like troylove11 would stop giving advice on things they obviously know very little about. The Toshiba projection sets never have loose connections on the convergence IC's, and there are never bad resistors in those sets. There is no separate convergence board and there are no adjustments on any boards. The convergence adjustments are done electronically, through the remote in the service mode. Also, moving or bumping a projection set cannot cause a solder joint to crack loose. Your set has 2 large convergence IC's and one of them has burned out. This is very common in projection sets. Do not attempt to enter the service mode to make adjustments, because you will only be messing up the correct settings and when the new IC is installed, the colors will still be way out of alignment. Replacing a convergence IC is a very simple thing for an experienced tech, and it is well worth getting the set fixed. If your set uses the STK392-010 IC's, it is probably a good idea to go ahead and replace both IC's with the newer, upgraded STK392-150 IC's. If you have not changed the convergence settings, the picture will return to normal once the IC is replaced and very little realignment will be necessary. When I do a housecall for a set like that it takes about an hour and a half and I charge $150, but shops in your area will vary so ask around.

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1 Answer

Ive got toshiba 40PW13P rear projection tv and it has convergence problem where more then one colours apear on the picture.

Well, you didn't ask what you wanted but I think you should try 2 things. One; unplug TV's power cord for 5 minutes, reboot. Two go into the customers menu and try to adjust the convergence.

If these fail call a factory authorized service dealer. Good luck.

Jun 11, 2008 | Toshiba Televison & Video

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You have a convergence problem. Need to replace convergence IC's.

Jun 02, 2008 | Toshiba 42H81 42" Rear Projection...

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Replacement convergence chips

I you give me your complete STK number such as STK392-010 as an example I can tell you what you can upgrade to also it does not require any resistor change when you upgrade but send me your complete IC number that you have and I can tell you what to upgrade to thank you

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1 Answer

Not the convergence amps (stk-120's)

Convergence amps require B+ voltage to run them...they originate in the power supply and are fuse protected......then
they are fed to current limiting resistors near the IC's....
These devices must be checked......But,the #1 problem is use
of less than first quality IC's......STK392-110's,-120 and-150 can
be upgraded to STK394-160E made by Sanyo.....I use Hitachi
part # CZ 01341 or save money = buy kit with two IC's and some resistors part # X any of my convergence
repair solutions......................T.

Mar 23, 2008 | Panasonic PT-47WX53 47" Rear Projection...

1 Answer

Green convergance goes out when tv warms up tosh projection tv

Convergence amp ic bad
Or send to

STK392-110 replace with STK394-160
STK392-120 Hitachi replaces these with STK394-160, for other sets it may not be a good sub. They have been fine in the Philips sets so far.
STK392-150 replace with STK394-160
***The 394 series replaced the 392 series and is cooler running. The subs listed here are the ones that I know to work in most sets.


Feb 20, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

Double imaging

The Toshiba 55H70 is a standard rear projection set. It does not have a "lamp", it has 3 picture tubes. When the colors suddenly do not line up on the screen, it means that one of your convergence output IC's has burned out and needs to be replaced. This is very common on those sets. If your set is using the STK392-110 IC's, it is probably a good idea to go ahead and replace both IC's with the newer upgraded STK392-150 IC's. The IC's should be replaced and the convergence circuits realigned by a qualified tech familiar with Toshiba projection sets.

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Toshiba 56H80 Convergence Problem?

There are 2 large IC's in your set and one of them has burned out. These are called convergence output IC's and are usually the STK392-010's. A good idea would be to go ahead and replace both with the newer, upgraded STK392-150 IC's. A good tech can change those IC's in about an hour and a half, and when I do a housecall for a set like that I charge $150, but shops in your area will vary so be sure to ask around.

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2 Answers

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.

Aug 13, 2007 | Toshiba 42H81 42" Rear Projection...

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