Question about Toshiba 43H70 43" Rear Projection Television

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I HAVE A TOSHIBA 43H70 I BOUGHT IN 2001 AND THE RED AND BLUE ARE OFF ON THE RIGHT SIDE. I HAVE TRIED TO USE THE CONVERGENCE BOARD TO STRAIGHTEN BUT MY RED WILLNOT MOVE TOWARD THE BLUE OR GREEN. ON NUMBER 1,3,7 THEY ARE RIGHT BUT ON 2,8 THEY ARE ABOUT HALF WAY AND ON THE 3, 6,9 THEY ARE WAY OFF AND SLANTED DOWNWARD. THEY ARE OFF ABOUT 1/2 INCH. CAN YOU HELP ME DIAGNOSE WHAT IS WRONG WITH MY TV OR IS IT WORTH FIXING

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This tv the convergence board are dead.Any colors R,G,B mis alignment,don't matches any colors lines.The tv convergence board the 2 STK convergence ICS and some or all it resistors are dead.These parts are dead,must be replaced to solved convergence problems.The Shop will cost u $300-350 for parts and labors.

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

SOURCE: CONVERGENCE PROBLEM IN TOSHIBA 43H70

I had a convergence prob with a Tosh' 43H70. The Green gun had a bend in the lower left hand side of the screen and red and blue looked bad. Ther are two large convergence driver IC's that control much of the convergence function. Their part # STK392-110 and cost about $14.00 each. You might want to find a geek who is good at removing and re-soldering parts on a typical printed circuit board. These IC's are quite large and are screwed to a set of cooling fins that are also soldered to the PC board.

Start by taking some digital pix of the back of the tv as you take it apart. There are some wire harness connectors that you will have to un-hook so you can pull the main board frame out, work slow and only take off the ones needed to pull out the board frame and flip it over to de-solder the IC's. DON'T try to take out the whole thing, just slide the board frame out enogh to flip it over. Make a drawing or note how many and where these connectors came from it will make it a lot easier to put it back together.

I used a good quality soldering iron and lot of "solder wick" to soak up the solder from the IC's and the heat sink cool fins and they came out pretty easy. There are a few small parts soldered next to these guys so be careful. After you solder wick the pins clean, grasp each pin with a small set of needle nose and move the pin from left to right and up/down to free up any remaining solder. Do the same at the heat sink solder point and the heat sink and IC should come out.

Add a dap of heat sink grease to the back of the new IC and screw it to the cooling fin haet sink and re-align the IC to the holes in the PC board. Have a helper ready to hold the IC in place and re-solder the cooling fins frist and then you can solder in the IC. TAKE YOUR TIME and work carefully.

After soldering the new IC's, re-check for solder "blobs" that may short two pins together. This is a BIG IC and shold be fairly easy to work with. If everything looks clean, re-install the main board frame and hook up all the wire harness connections. Be sure to put ALL the harness wires back into those plastic wire support looms to prevent arcing of the high-voltage CRT cables. (Large Red Wires)

My TV looked like a new unit after I re-converged it. Parts cost $24.00 total. Good luck..... Alex

Posted on Nov 22, 2007

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My Toshiba 43H70 started having the blue bow up at the bottom. Green and red are good. Convergence will move it a little, but not enough. Any ideas?


Your convergence has failed and needs to be repaired. Once quick test is to goto your convergence menu and see if you can adjust red and blue. If not its has failed and needs to be fixed. You can call in a repair shop or you can get the parts and instructions from www.TvRepairKits.com and do the repair yourself. Its a fairly easy DIY fix.

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1 Answer

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Hello, its very possible there are other color alignments thats out of ajustements and certain color lines will affect each range of alignment and
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Jan 23, 2009 | Toshiba 43H70 43" Rear Projection...

1 Answer

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Replace both STK392-110 convergence IC's with Toshiba or Sanyo brand........no cheap junk IC's !!!.................T.

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Did you check the resistors that power the ICs ocasionally 1 or 2 of them will go open when the ICs go out. They are located right next to the ics. Remove one leg of the resistors out of circuit, you will no doubt find one or two that are open and need to be replaced.

Apr 15, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

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you will need the origional remote you can get one fast through this link just enter the model number www.replacementremotes.com
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Mar 29, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

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Hi Mark, tough call without putting a scope to the circuit, either the convergence IC`s are going bad, signal from DCU is going bad (digital convergence unit), or possibly bad solder somewhere in the convergence circuit, I`m afraid your going to need a tv tech for that problem, BMW Rider

Jan 02, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

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Nov 02, 2007 | Toshiba 43H70 43" Rear Projection...

2 Answers

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You have bad convergence output ic's part #stk392-120. you will likely have to a technician intall these for you.

Sep 28, 2007 | Toshiba 43H70 43" Rear Projection...

4 Answers

CONVERGENCE PROBLEM IN TOSHIBA 43H70


Hello Renee, You have a convergence problem, but you are adjusting the wrong system. You need to adjust the convergence rings first ok You need a dot and crosshatch generator to properly set convergence for this set. Connect the generator set the TV to channel 3 and turn on the generator set it to dots adjusting the convergence try to get the center dot RGB all together and then adjust for the outer edges using the convergence board. the use the crosshatch to adjust convergence along the lines of the crosshatch pattern. Remember use the rings first and the the convergence board adjustments.

Sep 24, 2007 | Toshiba 43H70 43" Rear Projection...

1 Answer

43H70 Blue Convergence out of line and will not line back up


If the blue colors will not line up, and the blue appears to sag inward from one or more sides, then you can bet that one of your convergence IC's has either cracked loose or burned out. The IC should be resoldered or replaced and the convergence realigned by someone experienced with projection TV convergence circuits.

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