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pincushion and rainbows?

Discussion in 'Displays' started by Mark Shannon, Apr 11, 2003.

  1. Mark Shannon

    Mark Shannon Well-Known Member

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    Ok, I've had my TV for about a year and a half...it's a 52" RCA D52130

    already, it has pincushion distortion (a line placed near the top curves high-low-high, and near the bottom, low-high-low). It's kind of noticeable during the larger widescreen movies (1.85.1 I think), but not during the thinner ones (2.35.1 I think)... during 4:3 TV viewing, it is noticeable when the camera pans up/down

    Is there any way to fix this (is is because the screen is not totally fixed or something?) or am I stuck with it?


    Also, I don't know what it is called, but I am getting an outline around objects... it's usually a red outline for objects on the left side, and blue for hte right.... I know it has something to do with the Cathode Ray Tubes, but no idea what.... What is this called? and is there any way to correct this, or again, am I stuck with it...

    Also, should a TV this 'young' be doing that?

    Thanks in advance for any help
     
  2. Max Leung

    Max Leung Well-Known Member

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    Sounds like the convergence of the 3 CRT tubes (red, green, and blue) are off. It should be fixable, provided you know how to get into the RCA's service menu to adjust the convergence.

    My 40" Toshiba RPTV needs its convergence redone. I ignored the creeping misconvergence for the last 6 months. It will always drift.
     
  3. Mark Shannon

    Mark Shannon Well-Known Member

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  4. Max Leung

    Max Leung Well-Known Member

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    Yep, it is normal for all CRT projection tvs for the convergence to drift. Some brands and models are worse than others. Overheating could cause the convergence board to fail, or just make everything drift. On my Toshiba RPTV, the blue gun tends to drift the most. I usually have to touch it up once a month, although lately I haven't been giving a damn. [​IMG]

    To adjust convergence you would need access to the special service menu of your tv. I have no idea how to do it on an RCA. Normally I'd refer you to Keohi's site, http://www.keohi.com/keohihdtv/ , but it seems to be down. Is there an alternate address? I haven't been there in a long time.

    Your pincushion problem is probably related to the convergence drift. It should be adjustable in the service menu, although I'd be worried if it starts to drift on its own. Hopefully your problem has always been present, and you just noticed it now.

    Theoretically, making changes in the service menu would void your warranty. The idea is to never tell the repair guy that you ever accessed it. Deny all knowledge! Never mention any tweaks you made to your set. With that said, always ALWAYS write down all service menu values before changing anything. Be super careful with your remote, hitting the wrong key could mess up your tv.

    Making adjustments in the service menu may sound scary, but it is fairly straighforward. Just take the proper precautions and you'd be fine. Patience is the key.

    If you find out how to make the adjustments, and you find the geometry still screws up, I'd consider getting the tv taken in for repair work. Maybe your convergence circuit board is shot! But first, I'd rule out heating problems first. Is there ample room around the TV for ventilation?
     
  5. Mark Shannon

    Mark Shannon Well-Known Member

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  6. Max Leung

    Max Leung Well-Known Member

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    No problem! Nice setup you got there too. It's nice to get free stuff. [​IMG]

    Your tv arrangement is typical...I don't see anything that would cause major heat problems if the TV is designed well. However, I find that CRT RPTVs could have been done better. Many owners complain of excessive convergence drift because of poor soldering, too much heat buildup within the set because of poor design (which also messes up geometry and convergence), dirt and dust collecting behind the screen, etc.

    It's almost like owning a car! [​IMG]
     

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