Question about Samsung HCM422W 42" Rear Projection Television

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Sp43w6hp red gun convergence problem

Like a lot of postings on this site i have a problem with convergence, but just the red gun. Seems worse on the bottom right of the sceen, is fine in the middle/left (or directly in front of the red run) and a little off on the far left. The blue and green are fine. Seems to me that the red just cant focus correctly. Carefully taking the front off the TV I can see that there are four resisistors?? LDRs?? (not sure what they are) in the middle of each side of the screen. I guess these are used to focus the guns when I use the auto convergence option as each gun in turn fires lines across the screen which intersect these components. Funnily enough the autoconvergence always gets stuck and fails on the red gun cycle. If one of these failing is the problem does anyone know what they are called and how much they cost - it looks like I'm going to have to go to an engineer about this but i would like to know what the likely cost is before I get them out! Many thanks :)

Posted by dmac1980 on

  • dmac1980 Nov 07, 2007

    Thanks for your reply, how much do one of these STK IC's cost if they are still made? And how long would it take an engineer to replace one? thanks.

  • dmac1980 Nov 09, 2007

    Thanks for your reply. Does anyone know how much do one of these STK IC's cost if they are still made? And how long would it take an engineer to replace one? thanks.

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Anonymous

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You need to get two STK392-040 IC's to replace the defective ones on the convergence board. You DO NOT want to get these IC's from just anywhere. There are a lot of after market or factory reject IC's that some parts houses are sell and these do not last. Only get original Sanyo IC's to replace for the bad ones. I buy mine from here http://www.electronic-repair-kits.com/STK392-040.htm and have had no trouble what so ever. If you are good at soldering, you should be able to replace these on your own and save about 300 bucks or so. If you do not know how to solder or work on printed circuit boards, you really should call in a pro to assist you in this repair.Good Luck

Posted on Nov 09, 2007

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Hi!
as i see in your comment.. you have defective convergence correction amplifier ICs. the RED GREEN and BLUE (RGB) is amplified by the STK ICs. your RED convergence is not working good in the STK ICs! Replace the STK ICs a new one to get back the normal colors. Thanks...

Posted on Nov 06, 2007

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Anonymous

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SOURCE: Sp43w6hp red gun convergence problem

did you ever do a fluid refill on a crt?.........might be your problem.........

Posted on Feb 03, 2008

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1 Answer

Panasonic PT-47WXC43G green ONLY is bowed on bottom and top


Hi,
It still convergence chip problem, check big resistors nearby these chips that would be open or devalued and causing problem, specially in green convergence area, your green tube/ gun is just fine and just not getting convergence output signal to show correct image.
I would suggest to download service manual copy of this tv for small fee from any website and fix the issue with schematics help.
Thanks.

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Sounds like a convergence problem. I can tell you that the site that Jean posted will not fix this problem and could even make things worse. That site pertains to a specific problem that is common in some Sony sets and should not be used to try to fix any other issue.

Please keep in mind many things can go wrong with TV sets and you should really do a lot of research before attempting any adjustment and or repair. There are high voltages present and they can reside even when the set is unplugged.

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Yes your model is the V17 chassis mitsubishi. The Convergence Ics are located on the center board. you will need two STK392-570 convergence ICs. You can get replacement ICs at the following link and they provide free installation instructions. They are located on the backside of the wide heat sink with the fins on it on the center board
http://servicemanuals.vstore.ca/

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So you are able to adjust? the crosshairs move left and right up and down. you might have to get a tech to adust it in service mode.

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Convergence amp ic bad
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
http://www.hdtvoice.com/voice/showthread.php?t=28929
Or send to ptscorp.com
http://www.hdtvoice.com/voice/index.php?s=

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please mark the post with a fixya

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Hello,
I had the same issue as you pretty much exactly and so do others right around this last few weeks so I am thinking that this is a common problem with the product itself.

You can fix this pretty quickly with the link below. I bought it and it resolved the issue.

http://www.partstore.com/Part/Samsung/Samsung/PCN5425R/Samsung/Samsung/BP9500142E/New.aspx

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2 Answers

Convergence


Do not adjust any knobs as instucted in the previous thread if you TV have a convergence problem. Doing so will only make things worse. The blog does however show you how to fix other common problems with these sets.

Here are some of the most common symptoms and example photos of a convergence problem

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
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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.

2c07611.pngSolution #1

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.

Nov 26, 2007 | Hitachi 60UX57B 60" Rear Projection...

1 Answer

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Movement of any TV can result in a problem caused by bad
solder connections.In your case, the red convergence IC......
Found on a circuit board,mounted on large heatsinks........
Part # STK392-040.....Change both for prevent maintenance.
Do not use generics - I use OEM or better = Sam,Pan,Hitachi.
After repair,recheck alignment................T.

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Sp43w6hp red gun convergence problem


did you ever do a fluid refill on a crt?.........might be your problem.........

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3 Answers

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I have the convergence problem with the red. After reading your site I replaced the 2 ICs and the problem is worse. Before the only problem was I could not adjust the red horizontal. Now I have no control over the vertical or horizontal and the overall picture is very red and it bows at the top and bottom very bad. A friend said I might have the ribbon connector in wrong or the convergence (silver box?) box maybe bad. Any ideas? Thanks,Dave.

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