My Sony kp-53v80 has a perfect picture with DVD's but not with my cable service. I tried to replace the coaxil cables but my TV service is still a bit fuzzy. What could it be?

sounds like the inverter went bad...There's a high voltage device in there that runs the whole "picture" thing. There are capacitors involved with it that have probably failed leading to this mess.. That would be what that "crack" is...If you try to turn it back on does it just "click " and then stay off?

YOU LOST VERTICAL DEFLECTION THIS WILL REQUIRE PARTS REPLACEMENT

Are you saying you have NO rf input?

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.

You can also verify this problem by checking your TV with a DVD player...no lines indicate the TV is fine.

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...

And THAT is not an easy fix if you do see lines with your DVD player.

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's not a digital hi-def tv, so you either need a cable/sat box..or a converter once hi-def goes in and analog stops.

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.

i have a sony kp-53v80 i have a double vision or red lines on the left side of the screen. a repair guy fix it once by using the remote and puting in a code that brought up a white grid and it showed the red was out of line and he moved it back in line and it only took a few seconds to fix ... how do i get to that grid using the remote

Yes it sure can.

If you're NOT still under warranty you should at least open the TV and look for a blown fuse near where the power cable enters the set. A lot of times you can buy replacement fuses at a local electronic or hardware store and they're easy to replace. Check the fuse. If it is blown, it will be obvious and make sure that the set is unplugged before replacing it. If it blows again, or if it is not blown, your problem is probably in the 'X' volt regulator and you will need professional help with the repairs. You can also check the board where the components are mounted and resoled any that look bad. Brief power outages may cause the TV to turn off on its own. If you are using a surge protector, try connecting the set directly to the wall outlet. In your case it could caused by a blown fuse, a leaky diodes or a bad solder joint at the horizontal drive transformer. All can be replaced at a local electronic or hardware store and they're easy to replace If this does not correct the problem, you may need to have your TV serviced. good luck!