I have a Samsung 40' LN40C630K1F. When I turn the TV on, it turns off and on by itself a few times before it finally stays on. After about 10 mintues the tv will start turning off and on every 1 minute or so. I have unplugged the tv over night, next day the same issue occurs.
Here is what I have tried:
tried different hdmi cable
tried different power cord
plugged tv directly into the wall
removed batteries from remote
bypassed cable box
cleaned touch senstive buttons on front of display
remove back panel and checked for bulging or bad capcatiros on power supply board, none were bad
replaced power supply board anyway (problem still occured)
disconnected two cables from power supply board to which I think is the backlight inverter board. when I turned the tv on, no picture appeared but the tv still turned off and on by itself.
I ran out of options to try. Hopefully someone out there had suggestions or ideas on what else I can try.
I am not calling a repair man yet.