I'd recommend getting the screen changed properly. Had one changed through the fixed cost repair at the Sony service centre in South Wales. Superb service, camera back within 2 days!
Remember, if you fit a non Sony screen and have another problem it's obvious that the camera has been tampered with and will void your warranty. Also, taking the back off the camera affects the CCD alignment and can cause focusing problems. If Sony repairs the camera this will be checked and adjusted before returning it.