I need to know whats wrong with this tv and how much it will cost to fix

Hate to tell you this but mine did the same thing,took it to a shop,said it would cost way more than it's worth,I let them keep it.

more than likely the power supply has gone bad.i know its not what you want to hera but im sur the power supply is out and its something a shop would have to repair

Cost is relative.
The higher your skill with electronics the less it will cost.
You have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
The TV will get harder and harder to start up until one day it just won't.
It's not an expensive fix but let the tech know that you know whats wrong but don't have the parts to fix it or something like that so that he doesn't charge for a bunch of stuff that wasn't wrong.

It may be the power supply starting to go out. That can be inexpensive if you know how to solder and troubleshoot electronics, as you could replace a few components for a few dollars. If you have it repaired by a professional, it could become rather expensive.

the main strike relay is turning on the power board but the tube relay is detecting a fault when it trys to ingage the unit needs to be fixed by a lic pro there is no easy fix to this fault

hope this helps

swollen capasitors, replaceing will cost $500, so best to get another one, 42'' samsung will sell for about $800. the pn42a450

once a plasma has a problem, fixing it or not, more problems will occure, trust me, i am the flat pannel guru.

Instead of just unplugging the TV, perform a power drain:
1. Unplug the product's power cable so the device is not grounded to the house. 2. Press and HOLD the product's own power button for 1 minute to drain the capacitors. 3. Plug the product back into a wall outlet and try to turn it on.
Note: This procedure works with battery operated devices as well so remove the batteries and hold down it's power button.  Electricity can remain in capacitors and on circuit boards enough to prevent normal functionality. By clearing the residue electricity, your product will have a fresh start and many times this will resolve a buggy or non-responsive device that appears to be dead.
If the TV still won't turn on, then it appears something is wrong with it's mainboard since the TV is still receiving power because the standby light is still coming on.  The cost of fixing an older TV's mainboard could be costly or impossible if the part is discontinued.

Hello everyone, this is a common problem, this fix costs about $15 for parts, and some knowledge of soldering. here is the fix:

You need to buy these parts,

C707 - Part 0244211 (was 0244211F) - Cap. Ceramic DE1210R102K - $1.83

E994 - Part AZ00104M - Protector (CRXT491002) - $2.58

from: http://tritronicsinc.com/

the total should be around $12 with shipping.

then you remove the old ones, the numbers are labeled on the actual circuit board but if you still cant find them these pictures might help you:

http://img77.imageshack.us/img77/439/e994vj5.jpg
http://img441.imageshack.us/img441/1853/c707pic2cr8.jpg

and once they are removed solder the parts you bought in the place of them and plug the TV in and enjoy!

It could be caps around the power supply. If this is a LCD projection TV, it might be the color wheel.

I would call some TV repair places to see what they say. If it is a power supply issue, I cannot see it costing more than $50 to fix it. If it is a color wheel or something like that, the cost will be quite a bit higher.

Does the power light still come on?

Mike

The unit is going in to shutdown. Sounds like you have a short in the high voltage section.