Question about Samsung Televison & Video
From natural colors, it turns in water colors looking like, no more natural, with area of splashes of predominant red. I can associated with the look of a very old color photo that lost the colors. In the convergence screen is a big irregular island of splash of red. I can adjust the blue, but the red is nonadjustable. But the image is sharp, clear and bright, no "3d" image, no screen deformation. The all 3 cathodic tubes are working and you can see all the 3 colors coming out true the lenses (when I look inside the the tv). Reading about, I bought the two convergence IC (STK392-040) and replace them. All finish good, they are warm in an equal way to the touch, but the image is absolutely unchanged. The parts are from E-Bay, OEM, Sanyo. What else can be, and how to verify ?
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Posted on Jan 02, 2017
Your TV most likely has one of two possible problems.
Problem #1: Convergence Chip Failure ( common problem )
Here are some of the most common symptoms and example photos of a convergence problem
Here is a quick test....
Using your original remote go-to the tv settings then goto the convergence section.
Try to adjust the red and then the blue convergence.
You should be able to move them up, down, left, and right.
If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.
You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.
Problem #2 CRT Fluid is Cloudy
Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.
Picture of a set that needs the fluid changed.
TV set after fluid change
What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.
Posted on Feb 22, 2009
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
This model uses two convergence IC's----if 3 D one or both are bad.
Most of the time this set uses either two of the STK-392-110 OR THE STK-392-150 CHIPS.
Both chips and any bad protection resistors around them need to be replaced and the set adjusted.
If you are able to do the repair yourself total parts cost will be under 30 dollars.
Some history for you:
This set like all rear projection tube type sets uses two chips---the ones in your set are Black in color--about 2 1/2 inches wide X 1 1/2 inches tall and are on either one large or two smaller heat sinks with fins on them.
When the chips are installed a white grease called heat sink compound is applied to the metal back of each---the grease transfers heat from the chip quickly to the metal it is bolted to.
After some years the grease dries out from the heat and one of the chips goes instantly.
You can buy a pair of the chips for your set on Ebay for less than 15 dollars plus shipping--
If you cannot do the repair yourself--shop around your area---most shops charge 300-400 for this type of repair. Whoever you get to do it make sure BOTH chips are replaced or you will have the same problem in a few months.
If you open the set and locate the chips---they will have the full STK number printed on them in white letters----there are about 12 resistors around them that need to be looked at--if any are discolored they need to be replaced.
If a shop says it HAS TO GO TO THE SHOP keep looking as any good tech can do this repair right in your home in about 1 hour---I know as I have done hundreds of them.
IF you can solder and are handy I will give you general instructions on how to do the repair and what you need---some people I talk to can either do it or have a friend who can do it for them---let me know
I can tell you what you will need aside from the parts and how to proceed with the fix---
If all this helped rate this solution---I do this here for free.
IF YOU HAVE ANY QUESTIONS OR NEED ADVICE LET ME KNOW--I am here to help people.
Regards, SD TECH
Posted on Oct 30, 2009
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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.
If this information has helped you, rate this solution as I do this here for free.
Posted on Nov 07, 2009
Testimonial: "Very detailed and informative. I can't believe someone with so much knowledge would be so giving with his/her time"
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