Question about Samsung HCM4215W 42" Rear Projection Television

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Samsung HCM4215 No Power

I was reading your advice about a individual who was experiencing power problems with his Samsung HCM4215 television. (

I'm having the same problem too. The picture on the television was fantastic now convergence problems and the set has been rarely used. All of a sudden I started to get a loud popping sound when I turned on the television. The television functioned fine, but only on the initial start-up would I hear the popping sound. After about a couple of months of the popping sound, the television stopped turning on. No power.

I followed your instructions. I first unplugged the connectors on the convergence board to see if the set would turn on. No luck. So now I'm down to either replacing both the power/deflection board and STR type regulator IC or just one of the two. My question is: do I need to change both? I know what the power/deflection board is (AA94-08574A), but I don't know what the STR type regulator IC (AA13-00105A) is.

Can you please help me? I don't know what to do next.


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I have a 14" samsung hitron tv with a STR problem.The STR got burn beyond identification. Could you please help me with the value of the STR or a schematic diagram for this TV?
My email address is

Posted on Jun 13, 2008

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The Samsung HCM4215 Rear Projection TV was playing and all of a sudden the Picture disappeared but the audio kept on. Then I switched off the TV and tried to switch it on but the TV is not turning on. The...

Hi kantraman,
The main reasons of your problem is the bulb which is already came to its end. The unit will automatically shuts off when it sense a bulb failure. But before you replace the bulb I would advice you to work first on itspower supply. Look for open fuse/fusible resistor and spot some bad solder joints. This will do the same symptoms like what it showing now. If you don't have necessary tools and test instruments, and can't do the job yourself, I would advice you to look for a professional to troubleshoot the problem. Don't attempt to work in the power supply if you don't know the safety precaution of handling it, there some stored electricity enough to hurt you with a little mistake only.

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Feb 23, 2011 | Samsung HCM4215W 42" Rear Projection...

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The Samsung HCM4215 Rear Projection TV was playing and all of a sudden the Picture disappeared but the audio kept on. Then I switched off the TV and tried to switch it on but the TV is not turning...

First I need to clarify your tv. Your tv is not a DLP. It is a standard 3 CRT rear projection. So there is no Lamp/bulb to replace like you would find in a DLP.

As for your problem. I would suspect a convergence failure. I believe on this set, there is a small board in the back of the tv above all other boards with two STK chips on it. Access if from the back of the tv. You should be able to unplug this board and see if the tv comes on. If it comes on, the picture will be distorted and colors separated. if this happens, then you know you have a convergence failure.

If this is the case, you can either:
a) have a repair shop fix it

b) buy a new or used(most likely) board and replace it yourself and then re-align the tv.


c) Replace the STK chips on the board, any faulty resistors in the area and possibly a fuse or two.

You will need the service manual to help you with how to do the re-alignment once the chips are replaced.

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Your problem could be a bad focus pack, a bad convergence board or a problem in the power supply board. If you know how to read a schematic diagram, I suggest that, that is the first thing you should invest in. If you do not understand how to service solid state circuit boards, read a schematic, or use a multimeter, my best advice to you would be to call in a servicer for Samsung, as there is a lot of high voltage inside these puppies even when you unplug them. This is not a place to be experiementing around inside of. Good Luck with this repair.

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