Repairing Sony LCD tv

Try getting the TV menu on the screen. If you can't, it's probably the LCD panel or backlighting issues. If you look very closely sometimes you can see a dark image if it's backlighting issues.

If you can bring up the menu, but all inputs are black, then the problem is more towards the electronics. Usually computer VGA and HDMI inputs bypass a lot of electronics and may point you to a video switching issue in the TV. If this is all Greek, consider a trained service company. Choose a platinum servicer since they are Sony trained, certified and held to much higher standards than other authorized servicers. Sony expects them to make first attempt fix within 5 days of contacting Sony. Usually the right part is sent to the tech prior to them setting the repair appointment. Compare that with the others and you will see a clear difference.