Originally Posted by Ranger519v
I've spent hours reading through this thread but cannot clearly discern whether I need a power supply or a main control board for my PN60E8000.
Upon good power on, unit will shut off anywhere from 5 minutes to hours later. Front lower left red led flashes in the following cycle:
short (a quick flash), medium (maybe 1 second), short, medium, short, medium, short, medium, short, long (4 seconds)
... repeat ...
I then unplug it, wait, replug and turn it back on. Works fine for 5 minutes to hours and then shuts down again.
I don't know how many are still following this thread but can anyone tell me whether I need a new power supply or main board (which is much more expensive)? I'd like to believe the LED cycle above would tell us something but I couldn't find anyone referencing the flash code it is giving.
I have the exact same issue with my pn60e70000, i'm trying to troubleshoot it. It randomly turns off and standby starts blinking. If I unplug it for a little while, it will come back on.
I had a previous issue last year where the power supply was dead with no standby, but I got lucky by resoldering the transitors near the center of the board and it came back to life. I tried resoldering a bunch of them again this time but no luck.
At one point, it seemed that I could tap on the panasonic relay near the ac input and get things working again. I ordered a new relay from mouser thinking that was the issue. After installing it, it worked for a little while but still started cutting off again. I did notice the new relay is much quieter than the old one so maybe it helped, maybe not. I also updated to the 1060 firmware but that didn't much either.
Anyhow, I found the service manual on samsung parts dot com for $12 plus shipping so i have that on order. I borrowed a good dmm so I'll I'll start probing around for bad components. It seems capacitors and mosfets are common suspects so I'll probably order some and give it a shot. I'm not sure if I'm dealing with a power supply or main board issue so i'm hesitant to order a new board kust yet. Plus, if I can figure out which component to replace to repair it for just a few bucks, I'd much rather do that than shell out several hundred for a new board or repair service. Any advice would be helpful.