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CurtisMathes TV/VCR combo - Fuzzy screen clears when smacked!

Discussion in 'Troubleshooting and Repair' started by WyluliWolf, Jan 30, 2020.

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  1. WyluliWolf

    WyluliWolf

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    Sep 27, 2018
    I have a small Curtis Mathes CRT TV/VCR combo unit. It powers up ok but the screen tends to go fuzzy at times. A few slaps on the rear/side clears it right up. My initial guess would be some sort of loose connection. I opened it up, cleared out 100 years worth of dust, and visually inspected. I also made sure all cables on the circuit board were plugged in tightly.
    I know televisions carry high voltage (enough to kill you) so I want to be very careful. Does anyone have any advice on what to check first? Or should I play it safe and just use it "as is" until it dies...
    View photo for make/model. Thanks. TV-Combo.JPG
     
  2. bertus

    bertus Moderator

    669
    234
    Nov 8, 2019
    Hello,

    What do you mean with fuzzy?
    Is the picture out of focus?

    In most color tv's there is a focus adjust.
    Here is an example from the internet:

    focus_adjust.jpg

    You might also have a look at this page for repair tips:
    http://www.repairfaq.org/sam/tvfaq.htm

    Bertus
     
    Last edited: Jan 30, 2020
  3. davenn

    davenn Moderator

    13,580
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    Sep 5, 2009

    A photo of the actual screen fault would be even more helpful
     
    bertus likes this.
  4. WyluliWolf

    WyluliWolf

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    Sep 27, 2018
    It's very difficult to photograph a CRT TV due to the refresh scan lines etc. I tried to capture the progression with these photos. The first picture is fine/clear. The second shows a slightly snowy/specks pic. The third captures it best. Looks like a white blizzard blowing across the screen horizontally.

    IMG_3521.JPG IMG_3522.JPG IMG_3523.JPG
     
  5. bertus

    bertus Moderator

    669
    234
    Nov 8, 2019
    Hello,

    When do the distortions occur?
    Is this picture taken with a picture from the VCR?

    Bertus
     
  6. WyluliWolf

    WyluliWolf

    30
    0
    Sep 27, 2018
    Distortions occur at any time. It clears up if I bang on the tv. If it's bumped it will go "fuzzy" again. The photo's are with a VHS tape playing since CRT's do not pick up local TV channels.
     
  7. bertus

    bertus Moderator

    669
    234
    Nov 8, 2019
  8. davenn

    davenn Moderator

    13,580
    1,868
    Sep 5, 2009
    99% sure that is video tape noise
     
    bertus likes this.
  9. WyluliWolf

    WyluliWolf

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    Sep 27, 2018
    It's not the VCR guys. Its the TV set. Banging on the side of a VCR isn't going to clear a picture lol. I've cleaned the heads on the VCR prior to using it. The pictures IS clear most of the time. If the TV gets bumped, it will start having issues. A sharp smack will bring it back to clarity. I'm certain it's a loose connection or possibly a faulty solder joint somewhere on the TV PCB. I figured it was a common enough issue that some folks might be able to narrow down what to look for based on experience. It looks like I may be leaving this one as is.
     
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