Question about Toshiba TP50H60 50" Rear Projection Television

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Replacing the STK392-110'S

I need to replace the ic on the red convergence circuit.Problem is I don't know where to look on the board. Also, are there any related capacitors I should replace as preventive maintenance or so it won't repeat burning out another ic? Are schematics available free online?

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Re: Replacing the STK392-110'S


Posted on Dec 05, 2007

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Red color off to the left

Thats a convergence failure. often you can replace the two Ics and associated resistors to repair the issue yourself instead of replacing the convergence board. But you can get the ICs and resistors from which includes free tech support for help installing the parts. They also have circuit boards for most models available if you choose to replace the board instead of trying to repair it.

Mar 22, 2013 | Samsung HC-P4752W 47" Rear Projection...

1 Answer

Peoples faces blurred and turn red and green. could it be color wheel?

If the colors are not matching and shapes have a red, green or blue halos, then the problem is convergence rather than the color wheel. The problem is usually fixed replacing the two convergence ICs in the alignment circuit. The replacement involves de-soldering of two old ICs and soldering new ones in places. More components in convergence board (resistors, fuses etc.) may need to be tested and replaced. The repair ad the soldering job require training and experience and must be done by a technician.



Dec 11, 2011 | Projection Televisions

2 Answers

I have a Toshiba CT-90121 and my convergence is off. I can adjust the blue and red in the menu but cannot aline them with the green crosshairs. Do I need a new green projector or something else?

You need to remove the convergence Board and repalace the convergence IC's and and replace electrolytic caps and check for resistors that have changed in value. You can getb the parts at com or just purchase a new board at .

Oct 07, 2011 | Toshiba 65HDX82 65" Rear Projection...

1 Answer

Toshiba TN61x81-- after convergence IC's replced

Please don't be offended by my suggestions if you are experienced at circuit repair.
You may have a cold solder joint or bridged joint. Check and re-check your connectors for placement. It is normal to have to adjust the convergence and focus after replacing the IC's. There should be a row of focus knobs (ususally covered by a piece of black tape) with the screen controls.
The convergence IC's won't affect the visibility of a color only the alignment.

Sep 21, 2009 | Toshiba TN61X81 61" Rear Projection...

1 Answer

Red color convergence on Toshiba 57H81

Often convergence issues do not require the entire board to be replaced. You can resolve it by replacing the convergence ICs. The part in question is STK392-110. You will need two of them and they cost around 10$ each. But replacing them is a pretty complicated procedure and I would not suggest it to someone without prior experience. A service manual should get you started in the right direction if you are planning to do this yourself.

: Disconnect from the power supply before you start the repair. Also read the legend, the hv circuits are denoted by a special symbol, so you will know what you shouldn't touch.

You may also need to replace the nearby resistors that may have popped the IC in the first place. Read the service manual for further details.

Good luck,

Apr 01, 2009 | Toshiba 57H81 57" Rear Projection...

1 Answer

Akai/Samsung PT4299HD Convergence Problem

Ck 3 low ohm resistors 2.7 ohms they will be on same board as ICs.

Feb 13, 2009 | Akai PT4298HD Rear Projection Television

2 Answers

Akai/Samsung PT4299HD Convergence Problem

Try resoldering the pins on the ICs first. If that fails to resolve the problem, change the IC responsible for RED. You should be able to determine that from the service manual. In that area you should also see either fuses or low valued resistors that feed the STKs. Check those as well.

Let me know if you need further info.


Feb 13, 2009 | Hitachi 53UWX10B 53" Rear Projection...

1 Answer

Have a philips magnavox 8p6044 c102

Hmmm... I dont know where to find those CTR Circuit boards I'll post my general post for you about what I know it has links to the manual and some other sites it may help.

how bad is it burned, did some chips go or just the copper circuit board tracers. you can use circuit board wire and solder it from point to point,
I had somewhat of the same problem with my IC board, I had a bad portion of the board where I had to build a new copper routing with circuit wire, the copper burned off when the resistor failed, you may need to do a little Frankenstein work on your board as a last resort... remember use a low 15 watt soldering pencil, use leaded solder, and USE flux!
however with all my work, I got it running but the IC board is still not running perfect. if you decide you cant fix the TV I would love to buy your IC convergence board from you.
GOOD LUCK! hope I helped...

Actually I have this TV and you need 2 Convergence IC's STK392-120's (120's and 150's will work) of course order 2 of the same type I'm using replacement 150's they allow for a little higher heat and were cheaper ALSO you need to replace the 12 resistors with 6.8 ohm metal film resistors, make sure they are metal film! don’t skimp out here I did and then they blew and fried my IC's and I had to replace everything again!

Great reference link that I posted pictures on, check out page 3

Where I got all my parts that worked:
Suburban Electronics

Manual Library you should find all you need here:

What you need:
(2) STK392-120 OR STK392-150 IC chips
(12) 6.8 Ohm Metal Film resistors
set of star screw drivers
15 watt pencil solder pencil, DO NOT use a high watt iron you will fry the surface mounted item.
good leaded solder, and flux

BTW if you don’t plan on trying this and are going to throw out the TV, I still need a IC convergence board for a 51MP392H/17 TV I'm fixing, I'm willing to pay S/H and buy your IC board that’s not been tampered with.

Nov 12, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Replacing Convergence ICs

As long as you can solder you should be okay, however i would suggest getting your ICs at the following link because they provide free instalation instructions with pictures on how to remove and replace the Convergence ICs. heres the link.

Apr 26, 2008 | Samsung HCL4715W 47" Rear Projection...

1 Answer

Red color allignment

The convergence Ics need replaced. In Toshiba, resistors and sometimes a coil needs replaced as well. The convergence/deflection PCB is available, but, the cost of that board is higher than having a servicer come to your home and repair the unit to component level. If you are not familar with this circuit, then call a servicer. Have them replace both ICs not just one. Make sure they are repairing to component level and not replacing the board. Hope this helps.

Mar 31, 2007 | Toshiba 50H72 50" Rear Projection...

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