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Your repairer is likely to be entirely correct, without examining the tv directly it's impossible for anyone on FixYa to say he's wrong. Although the circuit board might be repairable, the extra time involved in tracing and fixing the fault will often be higher than any savings made by fixing the part. A repaired pcb with heat damage is also far more likely to cause additional problems in the near future which may not be presently evident, so the prospect of a further call-out for unpaid remedial work means that most repairers will not be interested in repairing the pcb.
Repair costs depend entirely upon local labour rates, taxes, and parts costs, and as you haven't said which country you're in it's impossible to give an opinion. Replacing the board should take under an hour, but many repairers will often clearly state that their minimum charge is for one hour and then charge for additional time in complete half hour units. Expect the total repair cost to be a little in excess of around 50% of the cost of a replacement tv. If it's lower than that then count it as a bonus.
With no sound and no picture it would not be the INVERTER, (no such part as "converter") You have a main board problem and it would cost around $300 to fix. These flat panel sets only last about 2 years, as much as they cost! You need to get a older type CRT television, pawn shops, tv shops, and yard sales have these, they are made much better than these newer sets and last 10 to 15 years or more. They also can be cheaply repaired when they breakdown.
Plasma TVs are sophisticated, compact assemblies with persistent high voltages inside. Repairs are expensive no matter where you go. All the parts are proprietary.
If you Google your model number and find similar reports of problems, buy a different set.
Bad news.. you might as well go get a replacement TV. You can have it repaired using a TV Repair guy but often it costs as much as a brand new LCD. My daughter broke my $1,600 LCD. It would have cost $1,200 to fix.. so I just bought a new one.After that I picked up a TV screen protector called TV Armor http://www.tv-armor.com Its designed to protect the TV from damage. Now I dont have to worry anymore when she is playing near it. It works really well.
If its dead completely no lights nothing to show power at all....then its the power supply. if your seeing a blinking light of some sort its probably a code. you can figure out what it means if you download the service manual.
Dont forget to include an extended warranty to the price of your TV! if you see a tv for 500 with the extended warranty and tax it could cost up to 750$ or more
I started to experience this problem as well. Eventually one day I turned my screen on and all the colors were crazy. Purple, Blue Yellow Green. I thought my TV was broken but then I noticed as well that the menu was not displaying the same issue. After messing with the menu for about 30 minutes I found the solution.
Go to SETTINGS. Then go down to DEFAULT. Select default and everything will be fixed.... for now. I think unplugging the TV over and over screwed up the settings. Hope this helps.