Magnavox 37MF337B/37: Picture stretches/shrinks vertically

[Junkrepair]

The set was dead until I replaced several diodes and 11 CapXon and Liton caps on the power supply board.

So now it's working! ... except sometimes the picture is alternately stretched and shrunk vertically (magnified and demagnified, if you prefer). It may happen several times per minute. Other times it happens not at all.

I didn't change out any components on the logic board, and there are still some CapXons on the logic board.

What would you say is most likely wrong?

Here are some of its specs:
* 720p, 480i/p
* Maximum Resolution: 1366 x 768
* Aspect Ratio: 16:9
* Screen Format Adjustments: Automatic, 4:3, Movie expand 14:9, Movie expand 16:9, Super Zoom, Subtitle Zoom, Widescreen

[R_J]

Re: Magnavox 37MF337B/37: Picture stretches/shrinks vertically

I would turn off "Automatic" in display format and see if it still does it, set it to something like Widescreen

[budm]

Re: Magnavox 37MF337B/37: Picture stretches/shrinks vertically

Try flexing the LCD frame to see if you can make it changes.

[Junkrepair]

Re: Magnavox 37MF337B/37: Picture stretches/shrinks vertically

Thanks for the replies.

R_J, I set the Screen Format to Widescreen as you suggested, and the picture is now stable. So that's good.

Is there a downside to leaving it in Widescreen? I notice that the factory default setting is Widescreen. I expect to use it mainly for over-the-air HDTV, and with a DVD player. I might use it with a computer through VGA or HDMI though.

I wonder how the Automatic screen formatting is supposed to work. Will it depend on the quality of the signal? I'm using rabbit ears, and the reception is often flakey.

budm, I guess you're thinking that the Automatic formatting is getting confused by a bad connection. Not sure what "the LCD frame" is. I guess it's not the same as the TV's case, and I would have to open the case. I did try to flex the outside case.