Question about RCA P52926 52" Rear Projection Television

3 Answers

Easy one - image shrinking when TV gets WARM

Hi, this one should hopefuly be an easy one for y'all, My girlfriend liked to keep the TV on all day for her dog. One day(about 8 months ago) i returned from work and noticed that the image had started shrinking from the bottom about 1 inch. I turned the TV off, went to grab a couple of things and when I came back and turned it back on the image was regular size. Since then it has gotten progressively worse. the longer the TV is on the more it shrinks and now it takes longer for the image to return to normal size when i let it cool down - i know it is related to heat because i turned the AC down to 62 degrees and the image shrunk less and slower then when i turned the AC up to 78. When it was 78 it shrunk the 52" view down to about 2/3rds it size in 45 minutes

I got rid of the girlfriend and i sure would like to have my largescreen back

thanks in advance for any assistance anyone offers up

(girlfriend dumping and TV shrinking are unrelated) (at least thats what I told her)

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Image shrinkage as you described is often directly related to heat. The normal failure componet is a Capacitor failure. Two types of capacitors are involved. Filter capacitors in the power supply which affect the output Voltage and Current available to the Deflection circuits and and coupling capacitors in the deflection (makes the screen appear to be the right size and shape) output circuit.

Judging from the information in your posting, it could be either one or both. There are High Voltages (I do mean Deadly!) all around the Deflection and especially teh Power Supply circuits so don't try to fix this yourself.

First the good news; It auctually is possible to have this repaired, if you can find a shop.

Now the bad news,
Analog TV goes away in about 1 year. In Feburary 2009 all analog TV stations have to shut down and use the new DTV transmitters with DTV signals. The tuner on your 52 inch RCA won't work for DTV without a set-to converter box.

I know you probaly are attached to the 52 inch set. After all the failing RCA stayed, while the girlfriend and I suppose her dog are now history.

Expect that your set with the repair bill and any subsequent repairs, will last one more year. You might get by for another year that way and you can get a set-top box and watch Digital TV, but if you have a 52 inch picture . . don't you want to see everything and you want it to look GREAT!

Maybe you have Cable or Satellite TV. Either way, you have to ask yourself, "What will I get for the cost of repair?"

My suggestion is: Weigh the estimated cost of a repair and the future life and repairs of this set against the cost of a 42 inch LCD set with the same screen ratio 16 x 9 as the movie screens.

Something to consider if you decide to buy a new set:
I said LCD bcause it will last about 7 years, depending on your viewing habits,
While the Plasma sets are only good for about 3 years.

Avoid Plasma!!! If you get a free one or win one in a raffle for a buck, OK! That might bridge the gap for you with the transistion to DTV, but don't pay for Plasma or you will get burned.

Shop carefully, compare prices and features.
DTV sets should have;

  1. Analog Tuner, so they will pick up over the air broadcasts now,
  2. Digital Tuner, to pick up over the air after Feburary 2009.
  3. Analog Video inputs for Legacy equipment VCR's, DVD's, TVIO's and inputs from the Satellite TV and Cable TV converter boxes.
  4. HDMI inputs for the High Def equipment yet to come and some like Blu-Ray DVD, Cable Digital Tier and Satellite Digital Tier services.
All the Best and Happy Viewing.

Posted on Feb 04, 2008

  • Bernarr Howell Feb 04, 2008


    I do agree on direct view displays over projection sets. Projection was nice for making big pictures and sports nuts were all a titter over them. I always thought they blew up every defect and the screen can't look that good when the image is processed on a one inch square CCD or Vidicon surface. Big Picture but unless you back up, it just looks blury.

    Personally the best pictures I have seen are still on Ikegami CRT's. They look GREAT. CRT's retain the contrast ratio better over time. the smaller the screen the sharper the resolution.

    As to Plasma and LCD, nothing displays sharpness like a CRT.

    Well, I am not trying to pick on you or burst your bubble. But the numbers quoted by the consumer industry do not tell the real story. It's Apples and Granny Smiths except one decays and is not good to eat sooner.

    Plasma's decay in luminous output earlier (about 18 months to 30 mo.) into the life cycle causes the Plasma to look dark and consequently be less bright than the LCD at the end of about 2.5 to 3 years. Contrast ratio falls off after a short time. They do burn themselves out. I have the benefit of tapping the experience of other engineers. These folks have been able to advise me. They have had experience with this issue previously. After being so advised, I have seen it in practice recently.

    Interesting you should quote 30K to 60K hours. If I told the General Manager of a TV station that; the new tube (cost $30K) for the transmitter would last about 3.5 to 7 years he would want to know why I was being so vauge. I would have to explain a 50% variation in life of a consumable product that affects the bottom line so drastically.

    In short; 24 hours times 365 is 8760 hours per year. TV sets and monitors running 24/7 are being subjected to less power cycling than in a home perhaps leading to a lower failure rate in full-time use. With the contiuious hours we learn just how long they will last. According to the numbers you quote, they will last 3.5 to 7 years, continious. It is still a 50% variation in life span. The truth is people like the contrast ratio in the beginning and it falls off somewhere around 18 to 30 months. By three years a new set is on the "must have" list. The old one might continue to run, but most folks don't want to watch it. It will probably be given residence in a place where it is seldom turned on.

    It is so great an expense right now, for most people to by a New DTV that it compares with something they might buy new, maybe every 5 to 7 years. Perhaps in time the price will come down and the technology will improve. Sometimes the consumer electronics industry and the electronics industry seem geared to be like medicene, they have a license to practice, but when will they get it right.

    It is not nice to trick consumers, they remember when they were sold a bill of goods and at what interest rate. Especially at the price of the new DTV unit. Yes the Plasma did look better on the showroom shelf, but I knew better because I had the advise of professionals. The LCD's were almost as bright so I don't believe that LCD's are not displayed. They were where I got mine. The salesman was pushing the Plasma, with another $250 to $300 on the price tag, and my 42 inch was almost $1K, I could see why. Especially if he thougt I would be back for another in 3 years.

    The analog TV's have been selling for bargain basement prices for the last 10 years. Looks to me like manufacturers are getting rid of them as fast as they can. Perhaps I am wrong, but I wouldn't buy the idea of a 10 to 15 year life span for a TV set. It doesn't seem reasonable with new technology. Hopefully it will improve.

    The SED seems nice, I hope to see something in April at NAB in Vegas.

    All the Best to you Bobby,



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I would suspect either a faulty vertical transistor or bad capacitor in the verticle deflection circuit.The tolerances ar falling off as the set gets warmed up.

Posted on Feb 03, 2008

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Resolder the vertical IC's leads. you may also have a failing capacitor in the vertical deflection circuit test them one at a time with freeze spray. or use the ex's cold icey breath.

Posted on Feb 03, 2008

  • Robert Johnson Feb 04, 2008

    bernarr, you could not be more mistaken about plasma the screen life expectancy is 30K hrs to 60K hrs or about 10 to 15 yrs of normal use. LCD does how ever last longer but it does not have the picture quality that plasma has.
    LCD 3000 to 1 contrast ratio
    plasma 7000 to10000 to 1 contrasl ratio
    SED 100000 to 1 contrast ratio
    LCD can never go to true black because of the back lamps, thin substrate that tries to block the light but just falls short. try looking at the screen in a dark room and look at the darkest sceens of a movie or show. there is a reason show rooms don't showcase LCD in darked rooms they look like crap.
    I think that you should do a little more research before you fall into giving faulse advice.
    presonaly I'm waiting for SED or Surface-conduction Electron-emmiter Display the best over all picture quality.
    nothing beats a direct veiw display.

  • Robert Johnson Feb 05, 2008

    Bernarr, you should open a thread in the experts lounge to debait this with all the experts on this sight.


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