Posting back about my problem

Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

More than likely you ruined the HDMI circuit. Over twice the required voltage is never good.

Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

Read the following:
http://blog.coppelltvrepair.com/2011/02/hp-pl4260n-suddenly-lost-picture-how-to.html

Different TV, but most likely same problem and, in fact, quite possibly literally the same boards, so maybe practically the same TV.
Can't be sure since you haven't posted the model of your Viore.

If you have specific questions, please always include the model number in the question...the model is on a sticker at the back of the TV, right after or below the words "MODEL:" :-)

The tv was working fine until this morning, then the picture went out but the sound is still working.
TV is only 3 years old, no real electrical problems

it is the y-sustain board that has a blown fuse.. it is problably the one on the left. by replacing the fuse wont solve the issue, you need to replace the whole board.

the sound suddenly stopped working on my Viore 42" plasma.

The power board has definitely failed. Sounds like a short that could be causing the cracklin sound.
http://www.shopjimmy.com/sanken-3501q00201a-power-supply.htm
I have ordered from this place before with fast shipping and no problems.
Hope that helps.

Take it back to the dealer from which you purchased, receipt in hand and raise a stink.

contact lg at 800-423-000. they may cover the repair. They might charge you a small trip fee and cover the part. sounds like the pwr supply is shutting down.