Question about Televison & Video
This Toshiba Cinema Series projection big screen(not sure the model) was given to me by a friend. it worked fine the last time they used it, but then set unused fora long time. now sometimes when i first turn it on tbe red convergence gets all wonky(kinda looks 3D) for anywhere from one to about five minutes, then it just fixes itself. is this normal, or is my red tube in need of replacement?
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Posted on Jan 02, 2017
You most likely have cold solder connections on the convergence IC's or on the B+ sources for the convergence. The longer you wait to have this simple repair done, the worse this will get and cost you double or maybe even triple of what it will cost now. Good Luck
Posted on Jun 28, 2007
If the convergence is off more than 1/2 inch or so you can't adjust. you have a failure of hardware. most likely the output IC. This set has 2 outputs for convergence. Each output contains 3 circuits, Six circuits altogether 2 red ,2 blue and 2 green. The normal customer adjustment will only alow adjustment of blue and red. They should be converged onto the green. There is a much more complex adjustment in the service mode for Geometry and convergence. These adjustments are only needed when you replace a failed componnent like the output ic. These ICs have been upgraded several times since the production of this set. The latest and most powerfull version is STK394-160. If feel up to it I suggest changing both outputs and the corresponding output resistors. Then do a complete geometry and convergence alignment.
Posted on Apr 16, 2009
55H70 model uses two of the STK-392-110 CONVERGENCE IC CHIPS.
If red is skewed and will not adjust you need to replace both chips and any of the protect resistors around them that are gone---Most of the time just the two chips need to be replaced.
You can buy a pair of the chips on Ebay for less than 12 dollars plus shipping----
The chips are black in color--2 1/2 wide X 1 1/2 tall with 18 pins each and are mounted on large metal heat sinks side by side----THEY WILL HAVE THE STK-392-110 PRINTED ON THE FRONT OF THEM IN WHITE.
The question is are you able to do this yourself? If you can you can save the set and a lot of money--most shops are going to charge 300 or more for this kind of repair---IT SHOULD BE FIXABLE IN YOUR HOME.
I HAVE repaired hundreds of these sets--just got back home from doing a Panasonic that uses the exact same parts your set uses.
The chips fail because a white grease to quickly transfer heat from them to the heat sinks dries out after time and one of the chips goes.
Let me know if you need more directions--the hard part of this repair is getting at the chips and the ability to unsolder and replace them.
TOTAL PARTS COST SHOULD BE UNDER 25 DOLLARS.
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Posted on Nov 07, 2009
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