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Equipment Repairs => LCD TV forum => Topic started by: Electroman2000 on May 07, 2020,09:54:11

Title: UE40F8000SZ
Post by: Electroman2000 on May 07, 2020,09:54:11

Hi All, I am new here and came around this forum as I was looking for some help with this set. When the set is powered ON, the relay clicks in and the Samsung logo comes for a second and goes OFF again, repeating the cycle over and over. I disconnected the main board and tried again. The power supply clicks, the backlight comes ON for a second and OFF again repeating cycle. Even when power supply is tested independently without backlight it keeps clicking ON and OFF but i do not know if it does that since its detecting the backlight disconnected or because theres a short in the power board. There is a thread from 2019 with the exact same issue but no solution has been posted... I would appreciate any help. THANKS.

Title: Re: UE40F8000SZ
Post by: Electroman2000 on May 07, 2020,09:56:35

Power supply is: BN44-00635A

Title: Re: UE40F8000SZ
Post by: downunder on May 08, 2020,05:40:27

My money's on a partial failure of one of the side led strips. Did one today - LED strips checked ok on LED tester, so I tried another PSU and mains board. Still in a boot cycle, so I gritted my teeth and stripped the display panel. Each side strip had 8 independently lit segments. Top segment in one strip was not lighting up. Too bad I can't find replacement strips on e-bay.              Bruce

Title: Re: UE40F8000SZ
Post by: michael first on June 08, 2020,05:11:48

what about trying another power supply?it sounds strange that the power supply doesn't remain active !