When I start the TV the left side is very

Unfortunately this is an issue with the LCD panel of the TV. The only way to fix it is to replace the whole LCD panel. It is the most expensive part of the TV and usually costs around the same amount if not more than a similar brand new one. If you are still covered under warranty, call up the manufacturer to schedule a service call. If you are not, still call them to see if they will cover at least part of the cost of repair.