Question about Samsung HC-P4752W 47" Rear Projection HDTV-Ready Television

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Replaced stk's npw need to align

I replaced the stk's myself. Had a friend who's a technician look at it and reassured me that i replaced it properly. Now he tells me that i need to align the colors .. I've tried but still don't quite understand how to do it.. Can some1 please give me a step by step rundown on how 2 do so..

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Re: replaced stk's npw need to align - Samsung HC-P4752W 47" Rear Projection HDTV-Ready Television Projection Televisions

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Posted on Jan 28, 2008

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Sony projection tv

go to the convergence pcb in inside the back and try replacing the STK's,.
they are the voltage regulators that control the alignment.

Feb 07, 2012 | Sony KP-51WS510 51" Rear Projection...

1 Answer

Picture is no longer working properly. Picture is blurry and colors are all wrong. Ghost image. Happened all at once not gradually. What needs fixed mitsubishi 65" medallion series. appox 7 yrs old

Your Convergence ICs have failed. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.

Try This:
When you notice the symptons Use this simple test to verify.
Go to the users menu on the tv.
Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.

If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section.
If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.

If you can move both in each direction then the problem is something else.

Note if one STK chip fails, you replace both regardless.

Feb 19, 2011 | Mitsubishi WS-55819 55" Rear Projection...

2 Answers

The picture separates into the blue and red images. is this worth repairing? can I repair it myself?

Yes you can repair it yourself if you know how to unsolder and solder IC's
The two large Ic's in your convergence Circuit has failed. You will need to replace both of them to return to normal viewing, Also the unit may need a convergence alignment after repair to insure picture quality.
Your tv's menu should have a user convergence alignment option in the setup option, but for factory quality have a technician do a factory mode alignment. Replaced both IC's with part#'s STK-392-120

Hope this helps you:
Please leave comment for futher assistance.
Thanks Lavell

Sep 28, 2009 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Changing Bulb In Big Screen

That model Sony doesnt have a bulb it has three picture tubes cost about 250 -300 each and need to be properly aligned when replaced

Mar 04, 2009 | Sony KP-53HS30 53" Rear Projection...

1 Answer

Picture alignment is off and the bottom and top are cut off

Hi, if you haven`t opened the covers yet your tubes are fine .. you can`t move them without removing the rear covers, if you have a 3d look ie; colors are seperated your convergence circuit has failed, stk`s will have to be replaced which requires soldering equipment, video-tek

Feb 09, 2009 | Sony KP-51WS500 51" Rear Projection...

2 Answers

Proscan 61700 chassis ptk195 ft

There are two STK on conv. board, even if they are not 392-180.

To know if the STK are the problem, test the pico fuses at base for continuity.
Replacing STKs require a precision soldering job, using thermal compound and taking care not to damage C board. This is not a job for beginners, and should be done by an experienced technician.

Here is how an stk looks like:





Dec 28, 2008 | Proscan PS61700 60 in. Rear Projection...

1 Answer


so what you need is to get into service mode
click here

Jan 29, 2008 | Samsung HC-P4752W 47" Rear Projection...

2 Answers

Now What???

I want to get this straight are you saying that you cant align them
and this is your focus problem or you have two problems that you cant get the convergence and the focus?

it might have been easier just to have the board replaced...
Samsung parts for convergance problem

Jan 28, 2008 | Samsung HC-P4752W 47" Rear Projection...

2 Answers

Convergence issue, green line grid out of square

most likely you have bad connections on green stk solder the connections or replace the stk check all fuses too

Nov 15, 2007 | Hitachi 57TWX20B 57" Rear Projection...

3 Answers

Picture is going bad

    The problem you are describing is called convergence mis-alignment.The repair is mechanical and requires soldering.
If you are prepared, I can take step-by-step.......

1) Remove rear cover and front speaker grill cover for access
2) Locate large,finned heatsinks that have STK IC's on them.
3) Replace Ic's
4) reassemble
5) check alignment

For more detail,please look it over and tell me STK # by
tomorrow if you have time...........T.

Oct 11, 2007 | JVC AV-56WP30 56" Rear Projection...

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