I'm working on a a Samsung LN52A750R1FXZA HD TV from 2008. It was sitting in someone else's storage unit when I inherited it. It was working OK when it was put into storage. When I went to pick it up, I noticed it was very heavy and part of the frame had broken loose from the internal fasteners as if someone tried lifting it by the frame instead of the chassis. I hooked it up and the picture was terrible and it just kept power cycling on and off every few seconds. I did some research and was alerted to the fact that the power supply capacitors are usually the culprits. I replaced about eight of the caps. Some were way out of tolerance and others only slightly off. I turned it back on and there was no improvement. The power was still cycling and the picture was terrible. I did some more research. I found a post from a tech that said to remove the T-con board and if that fixes the power cycling, then replace the T-Con board. I subsequently removed the T-Con board and sure enough, the TV powered on fine and remained on. I finally was able to shut off the set with the remote thinking maybe now I could reinstall the T-Con board and it would power up OK. What the heck, nothing to lose here. I reinstalled the original T-Con board and now the set is working just fine but who knows for how long. There is a firmware upgrade on the Samsung website which I'd like to apply. It comes with the usual warning that says not to install a version of the firmware with a lower version number than what's already in the TV. I put in the USB stick with the downloaded firmware and waited for the TV to ask me to confirm the update. It said, do you want to update the firmware from version 999999 to version 1012.2? I'm going to assume here that whatever the version of the original firmware, it's not v. 999999. Maybe it's corrupted? The question now is, should I just not bother with the firmware upgrade or update it anyway?
Thanks for your replies.