Alright so i have a 82" samsung qn82q70rafxza. Power surge knocked out picture, standby and sound. I replaced the main board and got sound along with i beleve standby. And the welcome and setup message.any ideas how to get a picture? Maybe led driver or t com board if there is one
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Yep, power spikes kill. Power spikes kill all. Power spikes kill all forever. Replace all and get a new surge protector that costs at least $99. If you never need it it is called insurance. I am in FL the capitol of lightning. High priced surge protectors are cheeeeep when lightning is there.
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
If you get no standby light or error blinks, the power supply board is bad. Most likely the power surge will take out some capacitors on the power supply. Replace the power supply board to solve the problem. This is a common failure caused by a power surge.
Note: If you are looking to do it the cheap way, you could try looking for bad capacitors (visually inspect for ones that look "bubbly") and replacing just those but it is not guaranteed to fix the TV as the power supply could have other issues and just cause the capacitors to bubble again.
The sony warranty repairman came by this afternoon and checked my KDF-60XS955 for the blinking green light that cycled the picture and sound on and off about every thirty clicks or seconds. After checking a couple of things he said it was the lamp XL-2200 or the ballast. chrismickey