Question about Toshiba 43H70 43" Rear Projection Television

3 Answers

My 43h70 Toshiba TV problems

I am having problems with my toshiba 43h70 projection TV. I did like you said and replaced both convergence chips but the problem remains. The red color seems to be the only problem, you can tell that it skews away from the other colors especially when words are on the screen. The blue and green seem to stay in the right spot but the red seems to sort of twist away from the others. Again, i replaced both chips with brand new ones but the problem persists. Any thoughts on what could be causing the problem?

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  • Justinsn95 Apr 16, 2008


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    I am still new to all this, so i will have to ask what you mean by
    "open". Is that like burned, or perhaps disconnected in some way? And
    when you say remove one leg, do you mean de-solder the resistor from
    the board? This is in regards to the response you posted about the
    toshiba 43h70 tv. I am the one who replaced both IC's but is still
    having a problem.

×

3 Answers

Try to adjust the purity ring magnets it seems to be mis aligned.or the convegence magnet ring.

Posted on May 03, 2008

Body { background: #FFFFFF; margin: 0px; padding: 4px; font-family: arial, verdana, sans-serif; font-size: 10pt; } p { margin:0px; padding:0px; } .spwrap { background: transparent url(../wysiwyg_rte/misspell.gif) repeat-x scroll center bottom; } I am still new to all this, so i will have to ask what you mean by "open". Is that like burned, or perhaps disconnected in some way? And when you say remove one leg, do you mean de-solder the resistor from the board? This is in regards to the response you posted about the toshiba 43h70 tv. I am the one who replaced both IC's but is still having a problem.

Posted on Apr 16, 2008

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  • Toshiba Master
  • 8,617 Answers

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.

Posted on Apr 16, 2008

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1 Answer

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If the model listed is correct the only way to know if the stk-392-110 chips this set uses for convergence are causing shutdown is to unsolder all pins on both chips and see if set comes on.

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The hard part of this is first you have to unplug several cables so you can get the entire chassis tilted up so the bottom of the boards face the back of the set. You have to unsolder all 18 pins on each chip AND 4 metal pins on each heat sink--when you replace the chips(apply heat sink grease to them) the hard part is getting all the pins on the chips and the pins for the heat sinks lined up so they go back into the board.

Then holding a heat sink and chip in place solder each chip/heat sink back in.

IT IS A VERY GOOD IDEA WHEN YOU REMOVE THE CHIPS TO CHECK ALL THE DARK GREY RESISTORS AROUND THEM---most are 1.8 ohm 2 watt---they can be checked like checking a fuse--if one of them is open you will still have the same problem if you do not find and replace it---they are protect parts---if one is open--one of the chips got it.

After you replace you can go into the TECH menu and fine adjust the convergence--you can do the same in the customer menu but the TECH menu offers more places to adjust and saves these adjustments---I have instructions for getting into that menu if you need them.

If you can do the repair yourself you can save a lot of money as most shops get 300 or more for this type of repair--a pair of the chips can be bought on Ebay for about 12 dollars plus shipping.

If you have any questions or need advice reply to this posting here.

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I've been getting parts lately from http://www.partstore.com/ and they seem to be reliable and trustworthy. The Part will probably only cost probably around $5-10 a convergence chip and a couple hours of labor.

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You need to replace both convergence ICs numbers STK392-110 . You can order replacements at this link I am enclosing. They provide free installation instructions and offer free on line instan messaging while youre doing the repair. I am one of thier Techs. This job takes about 45 minutes from start to finish. heres the link .
http://servicemanuals.vstore.ca/

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