Question about Toshiba TP50H95 50" Rear Projection Television

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Replaced STK392-110 convergence chips in tv

I successfully replaced the bad chips in the tv. It powered up fine. I don't have a remote control for the tv and I am ordering one. However, the red has shadowed and doesn't look like it is lined up. When I access the menu to get to the convergence, the buttons on the front of the set don't allow me to move the blue or the red. The operators manual for the set doesn't address this. Must I have the remote to fine tune the picture? Can I open the set and adjust the red convergence line? Any help would be appreciated. Thank you for the excellent tip yesterday on performing the process. A+.
I found this TV out at a dumpster at an apartment complex and thought, "Why not." Twenty-five dollars later and I have a tv with just this minor problem.

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  • j3738 Dec 07, 2007

    Also the red looks like it is out of focus.

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1) You will need the original remote for alignment...
Note: Do not open set to adjust red line.....
2) Remove lower front speaker grill cover and possibly the
access panel....find RGB focus / screen block...adjust red
focus...................................T.

P.S.remote control part 23306269 $26.90 ...........

Posted on Dec 07, 2007

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Posted on Jan 02, 2017

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Bowing at top and bottom, can't adjust convergence replaced IC


Your TV most likely has one of two possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

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Replace Both STKs convergence ICs number of part will be on them STK392-110 if this is the number use 180s To order Parts Go To www.electronix.com or Call 1-900-223-3205 These ICs are big black chips.

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