TV screen is half white half blac. There is no sound.

Sounds like the PSU is on its way out...Faulty Capacitors.

take a look here KIT112 LCD REPAIR KIT LG 37LC55 EAY34796801 EAX32268301 EAX32268301 8

The fault is with its vertical scan output stage circuit. Contact any service technician. This is not a user reparable fault. [Out of Sync: picture].
Gopakumar Gopalan Google

my TV has a half black & half white screen & half of the TV is showing the picture including the normal sound,what can I Do,?

No,tv is not worth reparing.The LCD screen panel is damages or broken is not worth repairing the tv.The LCD screen panels are limited produced by the tvs corporations and it 90% important to the tvs.By replacing the LCD screen panel,will cost the same as a new tv.Sorry,now ur tv only can be salvage for electronic boards for parts,not worth as a whole tv anymore.

some capacitors are faulty in the vertical section of ur tv,, they must be replaced ,calla service pro to replce it 100mfd 50v capacitor

BAD LIGHT ENGINE

One of your "X" buffer boards is defective. In Panasonic plasma tv's they are located at the bootom of the set and connect directly to the plasma diplay panel via a thin ribbon cable. The board you want to replace will be directly in line with the discolored vertival line in the picture. The part number is on the circuit board and usualy starts with "tnp..." or "txp..."

From your description it sounds like a bad picture tube. The lines are called retrace lines. There is a small chance that a component on the small board that connects to the neck of the tube may be bad. Without model number information it is very difficult so say further. Some picture tubes can be re-jeuvenated with the appropriate machine ( at a TV repar shop)
If you feel adventurous and are careful you might try GENTLY tapping the neck of the tube and see if picture improves/goes out. If the tapping does change the picture it is definitely the tube

The half picture is a verticale problem. This is difficult to repair. Send to a repair shop.

Your TV goes black & white, because your Wii could be NTSC or PAL which. If your Wii is PAL and your TV is NTSC then the TV will show a blac and white color. Since NTSC is for North America and PAL for Asia