Shows half screen only!

Interference. Separate the wiring so it doesn't touch. Touching wires create cross-talk of signals and keeps from running normal.

Plasma with Burn in within 3 years, I bet. I've seen Week old plasma's with burn in. Plasma technology is not as good as some would make it out to be. Due to the nature of the physics of the device, it is susceptible to something called "Burn-in" When an image of any form is displayed for long periods of time on a Plasma display, they start to literally burn in or wear out that part of the screen faster than a moving picture elsewhere on the screen. ie. If you have a television that is always on one channel and that channel always displays the little logo in the bottom right of the screen (abc, cbs, speed...) that kind of thing, you will eventually actually be able to read that logo even when the plasma tv is turned off. Check your manual or the manufacturer's website for your tv, and somewhere in there, it will refer to a "half-life" of the tv. ie. if your model has a 2000 hr half life, after 2000 hours of viewing, the display can at maximum, put out 1/2 of it's total brightness output. after another 2000 hrs 1/2 again as bright. and eventually it will be so dim that it's unusable. This is a fault with Plasma technology, LCD does not have this issue. CRT used to have this issue, but advances in technology have lowered this risk. So. What you are seeing is remnants of a bright image that was more often shown on that part of the screen than anywhere else on the screen. There is nothing that can be done other than replace the unit (or the screen, but it's easier to change the whole unit). if you've had this unit for 3+ years, you did pretty well. doing the math, if you only use your tv for 2 hours a day, for the 3 years you own it, assuming a 2000 hr half life, you've broken that limit. meaning that you will have parts of your screen that are very likely half as bright as others. Nature of the beast (plasma). This is why they are not as popular as they are advertised. Try an LCD next time.

I think you may have a tv tube problem...

picture board failure
take it in for a diagnosis and quote before wasting money on home repairs

That's a relatively easy one - you have either upper or lower Y-Sustain buffer board gone bad.

if the last chip of the upper buffer has failed you may get what you get, even that this is a relatively rare type of failure.

The same would happen if the lower buffer is bad although this is again somewhat rare for a failure for those boards.

Either way you need a new buffer board and I'd start with the lower if I were you.

I assume nobody has messed up with the TV because another possible explanation would be the two buffer boards were disconnected from each other.

The best is they are neither too expensive nor hard to replace.

Hope this helps!

Oh, here's a link with something more about those boards although I am not sure it would apply to your particular case...use it as a good educational resource, but don;t expect to have the exact problem described there:
http://blog.coppelltvrepair.com/2010/10/vertical-or-horizontal-color-lines-in.html

For more help please use www.coppelltvrepair.com/diagnose ..

Could be something as simple as a bad contact on one of the deflection yokes or other coils on the cathode ray tube - check the contacts on the circuit board where these coils are connected, resolder the pins or wires if the contact is bad, also check connector pins for any dirt or oxydation and clean if necessary.

Read more about this kind of problem at:

http://www.repairfaq.org/sam/tvfaq.htm#tvpopco

Hope this helps somewhat.

regards

3rq8 (Triarcuate)

Remove dry solder at Vertical IC if problem not solves replace VERTICAL IC and pf104

Darshan

no can do. you monitor is dead in the water.
lost of focus, and intensty. all point to one thing.
by the way, do you have the correct video driver installed???

that is the screen burned out. if still have a warranty return to company and get a return/exchange.

check for bad c14505 220mf.
or u14501 vertical output ic.