Chosen Solution
I bought a TV 2nd hand, has an issue where the backlight works, and you can see it “highlighting” different portions of the screen, but no picture. I replaced the TCON board with two different boards and same result. The service manual says that you can unplug the LVDS cables from the TCON to enter display “test mode” which will display test patterns. These do not come up either. Is the panel bad at this point? Possibly the mainboard? If it’s the mainboard, it’s a rather expensive repair. EDIT: No Flashing Light. Just a solid white light
rockysnow9 … your model does not have test mode via unplugging the tcon. all you have is the blinks on the front of the panel. please let us know how many flashes you get. when replacing the main board or tcon board on sonys: requires software installation for pairing boards together. youll have downloaded a .zip file. unzip this on the root of the usb. it should say .zip after the initial unzipping from your download. place this into usb 1 and leave for 30 mins. the tv will do what it needs to do. Tip: use a usb that has a light so you can gauge activity of the update. once you initially plug it in, about 2 mins will pass and youll start to see the usb light flashing indicating the process has begun. do not touch it for 30 mins after. after 30 mins, youll se no flashes from the usb stick and can power on the tv. do not remove the usb until after power on and update shows completed.
