Question about Samsung HCN653W 65" Rear Projection Television

1 Answer

Loose Connection for the Green Signal?

I have a Samsung HCN653W, which has worked great for the 5 years or so that I've had it. Recently, the picture began flickering, then going completely red (that is, you could still see the image, but everything was in shades of red). Occasionally, the picture is fine, and then will flash to red, and then sometimes it will come back to normal, briefly flashing green in the process. We had a tech come out to try repairing it, and he said that the lead to the green gun was loose, and he re-soldered it. It worked great for about a week, and now we are back to the same problem. It seems that walking near the TV or even an upwards inflection in the voices of spmeone on the TV can cause the picture to flicker. I plan to take it apart soon and look for more loose connections. Does anyone have any suggestions for where I should focus my search, and are there any special precautions to take (do I need to discharge any of the CRTs to make these repairs)?

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  • John May 20, 2009

    Thanks for the quick reply! Unfortunately, it is already out of
    warranty to the best of my knowledge. Also, the troubleshooting is on
    hold for a bit, because the TV seems to be (magically) working for the
    most part with the recent change in Weather here in FL (went from very
    dry and hot to cool and rainy with high humidity). though I have some
    background in electronics (computer engineer), this will be my first
    attempt to repair a TV, so if it seems to go beyond my abilities, I
    will just have to weigh out either a shop repair or a new set. In the
    mean time, I am reviewing the service manual for the TV, especially
    with regards to the screen/focus block, until the problem reaches a
    point that it is regularly producible again.

  • John Jun 22, 2009

    Ok, I finally managed to get the TV apart and start poking around. I started looking for obvious signs of damage, and did not notice anything. I did investigate the focus block a bit. I first tried adjusting focus for the green with no results, so I returned the pot to its original setting. Since the problem seems to be triggered by vibration, I began lightly tapping on the focus block with the insulated back of a screwdriver. I noticed that the green CRT did tend to go on and off as I tapped here, but as the TV began to warm up, it was less likely to flicker on and off by tapping here. I also tried tapping on the steel chassis mount that holds both the focus block and the CRTs, and once again had mixed success when tapping near the green CRT. I decided to try wiggling the wires going to the green CRT board, and it seemed that only more vigorous shakes that caused the board itself to wiggle were causing the CRT to turn on and off, so I tried tapping on the very edge of the green CRT board with the most gentle of taps, and this caused the picture to flicker every time.

    I guess my question now is:
    Does this seem consistent with a dying CRT, or is it possible that something less sinister like a bad CRT socket may be the culprit?

    I am including a link to a few pics including one that shows what the TV's picture looks like when it is at its worst. I uploaded them to Flickr due to the large size (I appologize in advanced for any inconvenience):

  • John Jun 24, 2009

    Hello again Jongar, and thanks for the quick reply! I got a chance to open it up again, and I tried tapping on various things again using a pencil eraser paying very close attention this time to the neck of the CRT. It seems that although I can get the CRT to flash by tapping on the neck, it does take a moderately hard tap to achieve this, especially when compared to the surprisingly gental touch it takes on the board to cause the symptoms.

    It also seems that tapping along the plane of the board (x&y axis) yields more results than along the z-axis, especially when tapping on the edge of the board or on a component near any corner of the board. When the CRT comes back on, the screen does flash bright green for about a half of a second or less before the picture settles at a normal color balance.

    I did notice a very small ammount of some substance on the green pcb, though it does not appear to be coolant but rather some flux from the previous repairs. No components appear to be singed, bulging, or showing any other signs of damage, but I did notice that a connector seems to be loose. CN503R, which connects the red CRT board and Dynamic Focus Block to the Green CRT board, is tilted at a bit (though barely noticeable) compared to its neighboring connector CN502R. I tried to get the connector to seat properly, but it was a bit stubborn, and I was hesitant to apply too much force with the board still attached to the CRT for fear of stressing or breaking the CRT neck.

    I would like to remove the CRT board to seat the connector but I am not sure how it is attached. Do I just need to pull the board straight off of the CRT, or does it lock into place somehow?

  • John Jul 12, 2009

    Ok, one of my Uncle's co-workers who used to work on TVs offered his assistance (which is great, because without seeing the work done before, I was not perfectly comfortable removing the board or discharging the CRT...). Right away, he noticed the same lovely cold-solder joints that I noticed (compliments of the last repair tech...). He re-touched those joints, and there was an instant improvement, but the problem was not 100% fixed. After spending a fair ammount of time inspecting it and re-soldering several questionable joints, he decided to do pretty much a global re-solder on the board. This seemed to do the trick, as the green CRT remains on now as it should, and no ammount of tapping/wiggling the board was able to change that :-)

    I still do have the wavy vertical (almost but not quite a herring-bone pattern) left, which I will be working on. My current thoughts are:
    1) Noise on the AC Line
    2) A failed or loose filter-cap or ground point
    3) Mis-alignment of the green CRT
    I also noticed that this pattern doen not seem to appear through a pure-red or pure-blue colored object on the screen, which makes me believe that the problem may be tied to the green alignment.



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  • 41 Answers

Well, first of all, isn't there a warranty on the repair?
It still could be a bad solder connection somewhere but I have seen what is called a G2 / Focus block go bad causing your symptoms.

Working around those tubes is not recommended unless you know what you're doing. You can really mess up the picture or worse, break a tube.

Posted on May 18, 2009

  • jongar Jun 22, 2009

    You might try taking a pencil and tap the green CRT on the neck above the circuit board using the eraser end. If tapping the board seems to be more sensitive, remove any silicon glue that is holding the circuit board to the CRT and gently remove the circuit board. Check the solder connections. If it is more sensitive on the neck, you may have a CRT going bad. Usually it will get bright green instead of loosing the green all together because of internal shorting of the elements inside the CRT.

    Also, you might check for wet / oily looking spots on the CRT circuit board. If the CRT is leaking coolant, that coolant can cause all kind of strange problems.

  • jongar Jun 25, 2009

    Generally, you can pull the board straight off. Sometimes they use a plastic clamp to help hold it on or silicon doped on the socket. Once those are loosened or removed, gently rock the board back and forth while pulling it off the CRT.

    If you can't find anything amiss and you're bold, you might do a board swap with one of the other CRTs and see if the symptom moves with the board. - Jongar



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