Question about JVC AV27F476 27" TV

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JVC AV-28WFX EUS1 unstable image

Hi, I'm having a small but annoying problem: the picture on my JVC AV-28 WFX EUS1 is continously but irregularly, changing in size. It is like a zoom function (only horizontal) that is broke. Change in size is only about half a cm to 1 cm, but very noticeable on the sides (clock upper right). Resizing happens sometimes every 2 seconds, but sometimes it's stable for 30 seconds. Input doesn't matter, whether analog tuner or SCART.

I've tried eliminating magnetic fields by removing all cables from periferal equipment, but to no avail.

When I change modes from Panoramic to Full or 16:9 the screen is a bit more stable for a short period of time, or this could be just my imagination...

Anyone has any suggestion?? Thanks!


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  • thuur May 07, 2008

    Thanks! You were close :)

    I have no pots (just a few on some connector board, the rest is via the remote control: system menu). Yesterday the screen started 'flipping', meaning from normal to extreme wide. Then it got stuck on extreme wide. When I hit the case the image returned normal. Today the screen went wide and the tv died. It went on Stand By and turning it on resulted in a ticking sound (tick tick tick) and then back to Stand By. So I opened it up and found a broken solder joint on a coil (pin 1 of W090/T521). This coil is near Q521 (Horizontal Out Transistot), which is typical for TV's that can't start the H.O.T. I don't know if the broken solder joint caused the H.O.T. to die, or that it was just a matter of time. Tomorrow I'm looking for a Panasonic C5552 (scary specs btw) or else it's a brand new flat screen for the misses.

    Thanks again!


  • thuur May 07, 2008

    Sorry for the typo's, but you'll get the point ;)


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Hello, I think you have a faulty "horizontal width" or horizontal
linearity preset pot. This pot will be located on the main PCB
and you can adjust it with a small screw driver, when you do the
picture will shift from left to right or vice versa, or move back to fill each side. If it wont hold after making the adjustments then the pots ( potentiometers) need replacing, which means unsoldering them from the printed circuit board( PCB) and take them in to your local radio shop for new ones. By the way you might need 2 pots ( 1 for the WIDTH and 1 for the LINEARITY)
Good luck.

Posted on Feb 06, 2008

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