Question about Samsung HCN653W 65" Rear Projection Television

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Convergence drift My HCN653W is about 2 years old. I find that the convergence drifts, so I bring up the crosses and reset the convergence, I save the settings and the picture looks perfect...for a couple hours. After a couple hours the convergence is off again--way off. It seems to happen in random spots on the screen, in varying degrees...but it's always significant. I've never had this problem before, it only just started.

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The feedback control is not working on one of the colours.

Check vblk and hblk pulses. and then check stk to convergnece module feedback pulse.

Posted on Dec 18, 2008

  • john clyde Dec 28, 2008

    Hi some samsung models are renowned for this problem.

    First off if the stk i.c.s are crook then this can happen.

    The most likly cause is the vblk and hblk pulses are not there on the convergence control

    module. The vertical ic can cause this usualy its marked la7845 .

    If all else fails then you will most likely have to replace the convergence controller.


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Well, problem is that your TV is just too big... ;] Most probably you're looking at a job that includes replacing some STK chip on the convergence board, or the board itself. in parts a chip should be around 5 bucks, and the board over a hundred. Good luck

Posted on Jan 22, 2006


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Replaced convergence board, but can't adjust convergence

Bad chips or faulty soldering....

Projection TV sets have several common problems listed below.

Problem #1) Convergence


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Example Photo:
Problem #2 CRT Fluid has clouded over.


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Example Photo:

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Convergence problems are very common on all Projection TV sets including Sony,Samsung, JVC, Philip Magnavox, Panasonic, Akai, Pioneer, Hitachi, Zenith, and others. You can get a convergenece repair kit wiith instructions from the links below.

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Problem #2

Another common problem is dull or washed out video.
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Greetings abflex,

You definately came to the right place! Here is a link right here on FixYa with the directions on how to correct this problem.

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