Re: SAMSUNG UN50TU8000F rebooting, backlight ok. No 12v to panel boards.



I looked at the CK1 through CK8 signals on both display boards with an oscilloscope.
All the signals on the unmasked side looked similar having a nice square 32.8vpp 17.1Khz squarewave chopped up by 50Hz 'sync or blanking' pulses. base of pulses at -6.8v, peaks at +26v.
There is a ~45degree phase change on each of the CK signals ‘sync' pulses to give a 360 degree spread as you go from CK1 to 8.

On the side I had masked off the CK1 thru 8 signals there was a messy...

Re: SAMSUNG UN50TU8000F rebooting, backlight ok. No 12v to panel boards.

My First BadCaps Post
I have a Samsung UA50TU8000W. It has a single ribbon cable going to the display boards.
I have achieved a reasonable fix after reading through this and several other posts and Youtube videos. Thanks Folks.

CAUTION I noted that the Mains capacitor on the power board does not appear to have a discharge resistor and was still over 250v half an hour after disconnection.

Symptoms-
1- When power connected Screen remains black. Back-light initially...