Question about Toshiba 43H70 43" Rear Projection Television

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Rplaced both IC's and now need fine tuning

I replaced both RGB driver chips (IC's) and also one resistor that was bad. The picture is much, much better however when re-setting the convergence I cannot get #3 and #9 convergence on blue to line up wiht red and green.
Thank you for you help

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  • mlmaschmeyer Feb 11, 2008

    I was able to find a blog on getting into the service mode and I was able to adjust the colors that way. Set is good as new.

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  • Toshiba Master
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You probably got 1 more resistor that is out of tolerance. These resistors have to be within 5% of their rated specs if not that's your problem. Check them with a digital meter with one leg of the resistor out of circuit for true readings

Posted on Feb 01, 2008

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98%of the time in this situation you either missed a bad part, installed a bad part, or created a problem with the soldering or removal of parts.

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Replaced IC chips, but can't fine-tune convergence.


U know how to use a multimeter right?Check and replaced all the resistors near the 2 convergence ICS.Most resistors are big and blue core in colors.

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I have a Sony KP-61V60. I seem to have a problem with the color covergance where my screen looks almost 3D with the red sticking out. What do I need to do to repair this myself? How do I know if my RGB...


If you go into the customer menu and select CONVERGENCE and red or blue will not adjust in some direction you have a Convergence circuit problem.

Most of these sets use two STK-392-110 or STK-292-560 CONVERGENCE ic chips.

Both chips need to be replaced. If convergence will not adjust you do not have a bad "bulb" these sets use three picture tubes--red, green, and blue and the convergence circuit "converges the three pictures".

Usual parts cost total is under 30 dollars if you buy the parts on Ebay--there are places on the net that sell kits for 70 or more---they contain the pair of chips and other parts that may be needed--from my point of view they are a waste of money as most of these sets just need the two chips replaced--some will need a bad resistor around one of the chips located and replaced as well--on Ebay you can buy a pair of whatever chips the set uses for under 20 dollars including shipping.

Right now the site where I research these models for exact part numbers is down but I can help if you have some skill at soldering and want to fix it yourself. Most shops are going to get 300 or more for this type of repair.

Let me know if you have questions or need help.

If this information has helped you rate this solution as I do this here for free.

SD TECH

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your Convergence IC chips and resistors arre failing you need to replace them

below is a general disscussion post for a Philips TV which will help you to understand your situation and what you might need usally you will need (2) IC convergence Chips and usally (12) Resisitors what have to be soldered onthe the board after you remove the old ones. this fix usally cost you to do it yourself $30, to have a repair man do it cost around $300-450 a new board if avalible usally costs $250-300

Sorry, for the bad new I hope you have a friend that knows how to work on circuit boards...
good luck,

below is a general post about a philips TV Convergence problem you can read about keep inmind your CHIP and RESISTORS will proball be different type....

you need 2 Convergence IC's STK392-120's (120's and 150's will work) of course order 2 of the same type I'm using replacement 150's they allow for a little higher heat and were cheaper ALSO you need to replace the 12 resistors with 6.8 ohm metal film resistors, make sure they are metal film! don’t skimp out here I did and then they blew and fried my IC's and I had to replace everything again!

Great reference link that I posted
pictures on, check out page 3
http://www.techlore.com/forum/thread/16736/Magnavox-51MP392H-17-51-quot--TV-has-double-vision/

Where I got my parts that worked:
Suburban Electronics
http://www.suburban-elect.com/
Manual Library you should find all you need here:
http://www.techlore.com/group/2/list_downloads



What you need:
(2) STK392-120 OR STK392-150 IC
chips
(12) 6.8 Ohm Metal Film resistors
set of star screw drivers
15 watt pencil solder pencil, DO NOT use a high watt iron you will fry the surface mounted item.
good leaded solder, and flux

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What was the location & value of the resistor ?
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Re-check soldered in 5 amp micro fuses F850,851,852,etc
Fix it ! ..............................T.

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