Question about Toshiba 43H70 43" Rear Projection Television

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Toshiba 43H70 I try to converge the blue cross and it moves up and down but not side to side.Heard to replace the IC's but dont know the part number or were to get them.

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Re: Toshiba 43H70

The Toshiba 43H70 has two RGB driver chips (p/n: STK392-110) responsible for aligning the RGB colors, one of them went bad. Instead of throwing the TV away, I decided to try and replace them, and fix the TV. I did, and it works great! I ordered two STK392-110?s online from, it cost about $18 including shipping. Each STK392-110 is about 2? in length, and 1.5? in height, and is an 18 pin device. The tools I used were all purchased at Radio Shack, and are: a soldering iron with a stand, solder, de-soldering tool, thermal grease, and a digital camera (yes, a digital camera). First, make sure the TV is unplugged! On the back of the TV, take the back wooden cover off. You?ll see a bunch of wires going everywhere, a power PCB board (probably brown), and a green PCB system board. The two STK392-110?s are on the green PCB system board attached to two big heatsinks. You will have to remove the green PCB system board to get to the two STK392-110?s and replace them, there?s no way around it. To remove the system board, you?ll have to remove the board with all the video jacks on it, and will have to disconnect all the wires going to the system board, as well as disconnect the power board from the system board. The power board and system board lie right next to each other, and are connected by two connectors. You have to be careful with those two connectors, and I used a small screwdriver, got it between the mating connector, and gently pried it open. It?s like an old mechanical switch, but instead of one contact, there are several. While taking everything apart, this is wear the digital camera comes in, take a picture of everything you disconnect and remove, and play the pictures backward so you know how and where to put everything back together. The system board is held down by several screws that will need to be removed. Once the system board is removed, you can see the two STK392-110 driver chips, however, you will have to remove several vertical boards and heatsinks to get to them freely. The STK392-110?s are attached to two heatsinks by two screws each. The heatsinks are soldered on the system board, so you?ll have to desolder them to remove them. Once you have them removed, Now that the old STK392-110?s are freely accessible, go ahead and use a pair of wire cutters, and cut them off at the leads (the 18 pins). Now desolder the 36 pins left in the board. Use the desoldering tool to get as much solder out of each hole so you can easily put the new STK392-110?s back in. (Make sure you put them in the same way as the old ones!) Put the two STK392-110?s into the holes, put the thermal grease on the metal side of the STK392-110, then attach the heatsinks to them, line up the two mounting screws that hold the STK392-110 to the heatsink, and start soldering everything back together. Make sure you use enough thermal grease between the heatsinks and the STK392-110?s, too much is better than not enough. It will look like the 18 pins are all connected together on the PCB system board, but they are not, make sure you individually solder each of them to the PCB board, and do not let solder from one pin touch solder from the pin next to it!! Use the digital pictures you took and play them backwards so you can put your TV back together correctly. Attach your TV cable to the TV, plug it in, and use the remote to turn it on (stand back just in case you crossed some wires), it should work, and the picture should be perfect.

Posted on Aug 14, 2007

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Re: Toshiba 43H70

This must be an old post but i found it while searching for a problem and this sounds really good. I ll be trying this. But if someone see this post please respond to it if you know answerr to my following question.

I have 42H83 Toshiba, and all of sudden one day there was a shade of red deviating on the right side. Everything spcially on right side seems two, one real picture and other shade of red. I did some search and seems it is convergence problem and solution is same to replace STK392-110 (even to move to STK392-150). I will search a bit more but if i have to replace this i ll be following these instructions ....


Posted on Jul 22, 2008

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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.

Jul 08, 2010 | Toshiba 43H70 43" Rear Projection...

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Convergence problems on right side of toshiba 43h70 43

Hello, its very possible there are other color alignments thats out of ajustements and certain color lines will affect each range of alignment and
you will need a tech to come out and check the control unit on your set.

Jan 23, 2009 | Toshiba 43H70 43" Rear Projection...

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Replace both STK392-110 convergence IC's with Toshiba or Sanyo cheap junk IC's !!!.................T.

Aug 16, 2008 | Toshiba 43H71 43" Rear Projection...

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Toshiba 65H81 convergence issue

Does the blue and red crosses move at all ... eather vertically or horizontally. if they move at all then it may not be the chips.. could be a resistor. if the crosses dont move then it probally the ic. these chips run about 7 to 45 dollars apeace depending on type. at our shop we charge around 125 to put in.

Jan 15, 2008 | Toshiba 65H81 65" Rear Projection...

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Resetting convergence daily on Toshiba 43h70

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

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

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Convergence problem

Blue convergence IC is bad! Blue CRT OK!

Required for repair---pull chassis,replace STK392-110 X 2.

Re-assemble,adjust convergence as needed.

Oct 12, 2007 | Toshiba 57H82 57" Rear Projection...

4 Answers


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.

May 21, 2007 | Toshiba 43H70 43" Rear Projection...

1 Answer

Another Convergence Problem?

dont move the pic tubes that will be a costly mistake the problem is still your ics replace them all you should have two check for bad solder connections

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