How doI take the cover off to clean the inside of the protective screen? sony KP-53v80

KP 53v80 is way too old to be fixing---recycle it as most landfills will not take that as it has toxic Glycol inside of it.

Remove the back hardboard cover by removing all the screws and lifting the cover up and toward you.

Mirror will be above but usually doesnt get dusty. Try not to touch it if you can. Same with back of screen. If you have a spider web just use a soft dry cloth to wipe it away.

You will likely find the upward facing lamp lenses covered in dust. Clean these with a soft cloth moistened with glasses cleaning solution. Glass cleaner works too.

YOU LOST VERTICAL DEFLECTION THIS WILL REQUIRE PARTS REPLACEMENT

Easy way to deal with this is to unplug set and remove back cover-----with one of the Swiffer type dusters(there should be plenty of room inside this set) gently reach up and get all the webs out---also a good idea if you do this with a lens cloth or paper towel with windex clean the three large black lens you will see when you remove the cover---they usually need to be cleaned about once a year(if they are dusty the picture will be darker and not a clear)

If this has been helpful give me a vote here.

No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted.
Check IC1509, Q1505

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It can be just an adjustment of your screen control. There is a "sweet spot" on the control where it allows the picture to come through. This is a common problem with sets that are getting old. If there is a problem with the high voltage from the color tubes then it will shut down the video until the problem is gone and it is safe again to show the picture. This is known as going into a shutdown procedure to protect the set. A technician will be needed to fix your problem since it will require proper troubleshooting and knowledge of high voltage system and safety procedures.

Sounds like one of the tubes is shorting out causing the set to go into a shutdown status so it won't cause any major damage to the set or house.

You can clean the screen from the back - take off the access panel. I clean mine once a year whether it needs it or not.

you have most likely a shorted hori out out NTE2324 and look around hori there is a 1200pf 2k volt cap that goes bad.I have fixed alot of sonys with this problem.

Yes it sure can.