This issue may occur if there is an issue with the connection between the Sony TV and the source device. To verify the source of the issue, change the input of the television. If the issue is visible on different inputs, service may be required. You can initiate service request using the link provided below.
you ave a rear Projectction LCD with a failing Optic Block. Probably not worth the repair, you can try emailing sony support USA at email@example.com with your model, serial number and contact info and a description of the issue and they can direct you further.