Question about Samsung HCM4215W 42" Rear Projection Television

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Black screen . when I turn the t.v. on I get black sreen ,sometimes I get rainbow on the screen, before it went black convergence all messed up. any ideas . thanks ernie

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Re: black screen

Replace convergence IC's,solder any/all bad connects.use OEM or better quality parts.

Posted on Sep 28, 2007

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Screen went black with a vertical rainbow line down the middle

Failue of the vertical section, could be the drive, the power to the section or even some discrete componets. Unless you are familiar with electronics , get some help to ceck out on these circuits, could not be major but to get themain culprit will require good probing.

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Tv turns on but the screen is black. Before it went black we were haveing bands of color on the top and bottom and everthing was kind of like in three D they were all three colors and like 3 of them there.

Ur tv have convergence problems,now the 2 STK convergence ICS are completely dead,U lucky u tell it was 3D screen,before it go completely dead,went black screen.Or ur problems it will very hard to diagnose.U now how to do soldering?Must replaced 2 STK convergence ICS,some or all it resistors.Tries Websites Tv repair, to buy a convergence kit to repair it ur self.The shop will cost u $300-350 for parts and labors.

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Sometimes I get a rainbow on the bottom of the screen.

Your TV most likely has a convergence 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.
Here are some photos of convergence problems.

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 will need to replace the convergence chips and possibly some convergence resistors and pico fuses. Its a fairly easy DIY job or you can call in a pro. If you want to do the repair yourself check the site Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, email/phone support, etc.

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1 Answer

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Hi, the convergence circuit is getting ready to fail, fix it NOW and you may get away with just resoldering the STK`s, soon they will overheat and short then it`s going to be 250-300 to fix it depending on your area rates, gl, video-tek

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Rainbow lines in my projection tv

You have convergence problems. The convergence IC's that line up the red, green and blue crt's are bad. They will need to be replaced. Suggest a qualified tech do the work due to the complexity and alignments afterward

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Need to replace the convergence amps, possibly some of the yoke return resistors and pico fuses in the convergence circuit,

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Appearing rainbow colour for sometime and getting off.

There are few cold (dry) solder joints in convergence board of your tv Sony KP-46WT500
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