Question about Proscan PS56700 56" Rear Projection Television

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No Picture I have the PS56700 and it no longer has a picture. Playing a DVD works but the cable box does not have a picture the screen reads "Unusable Signal". I changed the digital box, checked the box on another TV and put another TV in the Pro Scans spot to eliminate all outside issues. Any ideas why no picture?

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  • steveskyline Dec 10, 2008

    Yes, I did all that and changed cables. I even brought another TV in the room and hooked it up to the same setup and it worked. I switched it back to the Pro Scan and still no picture just says "unusable signal". If I play the dvd that has a picture on the set.

  • steveskyline Dec 10, 2008

    I unpluged the TV and pluged it back in to let it reboot and that worked. Thanks

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  • 60 Answers

Check your connection between digital box and yout tv replace it and try again then check input to be plugged good i mean ferm connection
Do that if your digital box work on other tv

Posted on Dec 10, 2008

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1 Answer

Cobwebs proscan ps56700 inside screen


It can be done from the front but from the rear is actually more easy and safe--removing front screen and frame entails some danger of damage to the screens.

I have over many years of outside/home service calls encountered this.

As a outside technician I want the quickest and safest way to do this.

With set unplugged simply remove rear cover:

Use a swiffer type duster to reach up and inside and gently get all the webs out(do not use force when against the inside of the screens) and if the handle is long enough you will be able to remove all of the webs.

Also when doing this you will see with cover off 3 large black lens at the top of the chassis above the circuit boards.

They are the light source for your picture--clean them with a lens cloth or a paper towel with Glass cleaner sprayed on it---Do not attempt to clean the mirror in the rear as it is a film material and is easily scratched.

If the lens were dusty/dirty and then cleaned the picture will be brighter and sharper looking----that should be done about one time a year.

If you have questions make a comment here on this page(make a comment button).

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You can try switching cables.

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1 Answer

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A problem like yours is NORMALLY NOT the TV set's fault....it's the Cable.

I'll bet you see thin lines moving across the entire picture...they are slanted like this >> \ \ \ \
That's generally caused by a bad ground on the antenna cable OR it can be the cable box's MODULATOR.

Try using your VIDEO OUTPUT off of your Cable box and see if the wavy lines are still present. If they are the Cable box needs swapped with a good unit.

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If you have problems with the DVD player's picture, then you must have dried out filtering capacitors on the Video board IN the TV set...

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Elsewhere! Bad hyper board =bad caps on board need replacement = find a different tech who has heard of this repair or
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