Question about Samsung HCN4226W 42" Rear Projection HDTV-Ready Television

2 Answers

Which part(s) to replace?

The top 25% and the bottom 10% of the screen turns to yellow with an arch. Therefore, only the middle of the screen with an oval shape has somewhat the correct colors and it's "framed" with this yellow hue. Also, I notice the image of the yellow regions repeats itself towards the middle of the screen in blue. Unplugged the tv for couple hours, replugged and turned on tv. The screen first look cured but the discoloration appeared again in couple of minutes.

Reading from the existing posts, it seems that the convergence board(s) have failed and three replacement part numbers are called out (BP94-00155A, BP95-00142E, and BP95-00415B) to fix the problem. BP94-00155A and BP95-00142E look similar, so which one should I get? Or do I get the BP95-00415B? Or both?

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Where is the fan?

Posted on May 06, 2008

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  • 5,568 Answers

If the screen looks OK after extended cooling is provided, you may just have a failed cooling fan.
Turning the blade with the power off will tell you if the bearings have failed or stuck, or just look at it with a flashlight to see if it is turning.
Check this first before you start replacing boards.

Posted on May 05, 2008

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1 Answer

Vertical blanking


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Arch in color on Panasonic


hello sound like convergance chips also check resistors and capacitors hope you get it fixed

shaun

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Toshiba rear projection 42h81 convergence problem


In that case the convergence Ic's are defective or "leaking" they must be replaced. these are the TDA's

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Picture arches down at the top and arhes up at the bottom


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

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.


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.

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TV set after fluid change

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2c07611.pngSolution #2


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.

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Sony 60" LCD projection TV has yellow screen discoloration


It sounds like you have a bad Blue Polarizer in the light path. I'm sorry but that is something you will have to contact a service center for. It's not something you'll be able to do yourself, I'm sorry, but that's the best advice I can give you.

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2 Answers

The 3 colors are off, i have shadows and arches in the screen


It is failure of convergence ICs and these two ICs will be replaced on D board.
If you are comfortable with TV repair and know good soldering skills then can do the job easily.
Convergence ICs are mounted with sliver heat-sink on D Board of TV and part number will start with letter STK...
Get back to me if you need further info.

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Arch on top and bottom of screen


I read that these sets have a problem with the yokes on tubes sliding down some- there for causing this problem make sure yokes are all the way up on neck of picture tubes,this may fix your problem!

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Re Degaussing


Now Degaussing and convergence are two different things, if you say its degaussing then you should have just a color differential in a certain area, meaning the color should not be arched, everything that passes through should pass throu only with the changing of color. Now if its a convergence the the color may lift upward in an arch, likely separated from the other colors, Red, Blue,or Green. So now which do you think you have? Deguassing usually give you a highish green color or yellow

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Picture then fades to blue.


Please post me on this as well. My Sony just turned 4 yrs this Jan and just last week it started having the same problem. -Thanks!

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