Question about Toshiba 50H72 50" Rear Projection Television

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Convergence IC upgrade

I have an Toshiba 50HX70 were the colors have seperated that uses the STK392-110 convergence IC in two places. Is there a better IC replacement, I thought that I had read a clip about replacing it with an STK392-180 in a Panasonic unit. I have gone into the menu to make adjustments, but it did not totally fix the problem.

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You know.. so many of these 5 to 7 year old TVs with STK392-110s are dying with the same color convergence problems. Why? Because the STK392-110s are unreliable. So, why replace a failed, and unreliable part with the same unreliable part?

Last week, I replaced the STK392-110s in a Toshiba 55H70 with 2 new STK394-160s. And it works beautifully. My post below describes my efforts:

http://www.fixya.com/support/t1372240-colors_all_sudden_went_out_wack

From my research, the STK392-110s are an unreliable chip that tends to overheat and doesn't last more than a few years at best in a new board, where all the resistors etc are in perfect condition. In an older board, these feeder parts may have moved somewhat out of tolerance and the STK392-110, by some reports, dies much quicker in such an older board.

The STK394-160 is the latest compatible replacement part for the STK392-110, is much more reliable and runs much cooler. Also, I can vouch that the STK394-160 works as a fully compatible replacement for the 110 in a very similar model Toshiba (the 55H70).

Dean

Posted on Jan 06, 2009

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You should stick with the 110's. the pinout may be the same, but that doesnt mean they will work. Also you need to check all of the large 1 watt resistors by the STK's - if one is bad or out of spec it will greatly effect the picture. Remember, you need to test these OUT OF CIRCUIT.

One more thing, there may be some small Pico fuses or other fuses near the convergence power supply - check all fuses as well.

Posted on Dec 19, 2008

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Im having a convergence problem with my 50HX70. The tv was working fine until one day i turned it on and there was a blue shadow on the bottom half of the screen. I tried to adjust it and the horizontal...


Tv have a dead convergence board.The convergence board require replacing 2 STK convergence ICS and some or all of it resistors too.To fixed the convergence board to fixed the tv picture convergence problems.U have all tools and can do soldering?Yes,tries websites like Tvrepairworld.com,Tvrepairkits.com to buy a convergence kit to repair it urself.Or the shop,will $300-350 for parts and labors.

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1 Answer

Fuzzy picture and dark picture and color seperation when hot.


The colors seperating is a convergence problem, as far as being dim this may be related but the TV likely needs service adjustments.

convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually $200-$400 Be sure to vote/rate me if this helped Thanks!
See link for more detail
http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html

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50hx70 blue projection light is concaced at top and bottom of tv


When the convergence amplifier ICs go bad (STK392-xxx), they RARELY cause more than one color to go out. The fact that the top and bottom of the picture are effected indicates the vertical convergence IC. Replace both, and while you're in there check the bias resistors... it is likely one of these is open. Once the ICs have been replaced (as well as any open resistors), customer convergence followed up with the auto convergence should do the trick.

Nov 19, 2008 | Toshiba 50HX70 50" Rear Projection...

1 Answer

50hx70


you need to replace both the convergence ICs number STK392-110 you can get replacement ICs at the following link and they provide free instalation instructions with pics so you can do the repair yourself. Heres the link.
http://servicemanuals.vstore.ca/

May 29, 2008 | Toshiba 50HX70 50" Rear Projection...

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check for solder bridging between the IC pins. also make sure the wire connections are back in the proper locations

Feb 14, 2008 | Toshiba 50HX70 50" Rear Projection...

1 Answer

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There are kits available online, which include the chips and the soldering iron too.......Just a word of caution, convergence chip replaced is more difficult on Toshiba #1 the chips face other boards that must be remove first. the main one is the convergence generator (which the sheild is soldered in placed) Also the signal board (which is what everythings mounted to is very fragile)..............Good Luck

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1 Answer

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Convergance IC replace.
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm

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you have bad connections on convergance ic solder them if that does not fix then replace them

Nov 03, 2007 | Toshiba 50HX70 50" Rear Projection...

1 Answer

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replace convergence ic,s part # stk392-110, you will need two of them.

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