Question about Toshiba 50HX70 50" Rear Projection Television

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Green arch at bottom of screen toshiba 50hx70

Toshiba 50hx70 it is about 8 years old. on the bottom part of the screen the green is arched up above the red and blue and gives a double letter effect... thanks for any help

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  • papawmax Dec 29, 2008

    Yes I am going to do what blueextc3221 suggested I can replace intergraded Circuits & replace some resistors. It would help if I new where they were located at, or maybe a schematic of the circuit board they are on. Thanks I will let you know how this turns out. MAX

  • papawmax Jan 09, 2009

    I fixed it and it works like a new one. I replaced the 2, STK392-110T Convergence amplifiers that I bought on line for $14 each plus shipping. It was not bad taking the board out (30 min) with extreme caution. I was about 45 min. taking the old chips out and replacing them. Each chip had 16 legs that had to be unsoldered and the new ones soldered back in. I don’t thing I would recommend someone doing this if they went fairly good at soldering and had a little experience in soldering. It is basically a no brainier if you can solder. I have been a Truck driver all my life and now retired and I did. But I would not have tired it if it wasn’t for this web site. If i can answer a question you might have I would be glad to help. Thanks



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It sounds like a convergence gone bad.

This requires either a competent shop or an experienced technical person who can solder and has experience in replacing Integrated Circuits.

The shop will charge around $300 to $400 to do the job.

If you can do it yourself or have a technician/engineer friend the cost of parts will be around $60 - plus lots of labor.

The convergence system will require both STKs to be replaced. They are 16 pin Integrated Circuits and must be unsoldered and the new one soldered in. Often there are a couple of resistors burned out that need replacing also.

You can often find the STK part number easily by going to and chase down the part. When you find it on you will learn their price is about $40 each. But, you can locate this same part from other suppliers by googling the STK number and find them for $6.00 and up. But, I do not recommend the cheap ones as they don't last long. The $20 ones are probably okey.

The STK for your model is the STK392-110T.

Hope this gets you started.

Posted on Dec 29, 2008

  • blueextc3221
    blueextc3221 Dec 29, 2008

    This $15 downloadable service manual should get you what you want.

    A Factory Authorized Toshiba Tech will not give out these manuals because he is contractually barred from doing so, or he will lose his service contract.

  • blueextc3221
    blueextc3221 Dec 31, 2008

    The email address you gave to was invalid. So here's my reply to your question posed to the FiXya Staff:

    No, you need the exact part # I referenced. The numbers after indicate a different part number. Basically the same, but different characteristics that its not important to get into.
    Glad I could be of assistance.

    By the way, on the 55H70, there is an easy way to remove the STK392-110's. You don't need to remove the PCB, connectors, cable or anything like that. The power PCB and the control PCB are screwed onto a plastic frame. The plastic frame then is fastened to the TV wood by 3 black wood screws (it might be less or more on different model). You remove these 3 screws then loosen the cables from the cable ties and holder then slowly pull the entire board out. Then you can stand the entire board in a vertical position where you can desolder and solder the ICs. Taking the board out to this position takes 5 minutes. Soldering the ICs back take a little more care since you need to do it vertically and the solder tends to drop down a bit.


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