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Hourglass picture. Panasonic CT-35G30T The picture is hour glassing from the sides. Starts to flicker back to normal after 1 to 2 hours. Getting progressively worse. Takes longer time to reach normal screen.I slight tap on the side of the box snaps it to full screen, only after tv is warmed up for an hour or so.

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  • fladavid Feb 02, 2010

    Thank you. I am capable of doing the repair myself, I just need to be pointed in the right direction. I've fixed loose solder joints on powder transistors before on my vintage Yamaha equipment.
    In case this isn't the problem......Do you have any other suggestions on what to look for?? I have a Fluke 29 dmm to troubleshoot with.

  • fladavid Feb 20, 2010

    I've checked all the solder connection on the bottom of the main board and the add on boards. They all look mint. I'm thinking it's a bad capacitor/component somewhere. But where is the question. I have the service manual I downloaded that I could forward to you if you if you give me you email. If you could show me the correct circuit, I will replace all the components in that area.
    Thank you.

  • fladavid Feb 20, 2010

    I wanted to add....The hour-glassing goes away after the set warms up, but sometimes it takes two hours, sometimes ten minutes. Just tapping on the set doesn't work.

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This is caused by bad solder connections in what's called the pincushion correction circuit. Some of the transistors get quite hot, and over time the solder connections to the TV circuit board become intermittent. When you tap the set, it causes them to make contact again so the picture is normal, but then it goes funny again. Resoldering the connections would take care of this problem. I would suggest calling a professional in to make the repair, which would cost far less than a replacement TV.

Hope this has been helpful, and thanks for using Fixya!

Posted on Feb 02, 2010

  • Feb 20, 2010

    Sorry to be slow in responding, but I lost track of this. I don't have service literature for this model in my library so I can't point you toward specific parts. The pincushion circuitry is part of the set's horizontal circuit, so the affected parts are on that area of the circuit board. That's where the flyback transformer is located, easily identified by the wire that runs up to the rubber cap near the top of the picture tube. Examine solder connections in that area, particularly on transistors mounted on heat sinks, and resolder any that don't look nice and shiny. Sometimes you'll see visibly broken connections, which makes the job easier.

    Wish I could be more definite, but that's the way I usually solved this problem when I serviced TVs. Just eyeballs and a general idea of where to look.

    Good luck! Since the problem seems to be solder-related, you shouldn't need that meter.


  • Feb 21, 2010

    OK, I'll give it a go if you can email the manual to pgh_pa_guy@hotmail.com

    Does sound like a capacitor that is slow to charge. I guess the part of your original post that said tapping cleared the problem after an hour warmup didn't sink in. I must be getting old after all.


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