Been working but now has white screen and yellow light blinking

The display being white can be due to failure of the LCD or the CCD which is the optical sensor of the camera. So to confirm check the older picture to be seen on the display. Confirm this by checking the card on your PC. If the images/picture is seen to be of good quality, then the LCD can be faulty, fault on the linking cable or the control board.

However if the older images are seen well then the LCD is working correctly and the fault can be failure of the CCD- charge coupled device in the camera. If you have accidently exposed the camera directly to high intensity light / sunlight, then it is possible that it is damaged. Remove the battery and keep the camera aside to reset and try as a last resort. Get estimate before you decide. It will be good to have it checked at the authorised service as you do not have to run around for spares.

Please click on the link for tips to replace a LCD

Click here: LCD