What the hell is going on here?

[jim_griff]

Sorry, had to share this.

Either I'm the idiot who doesn't understand something critical about a design flaw in Samsung's power supplies, or this guy's the idiot sharing potentially house fire causing advice.



"Hey, I'll just cut this jumper in the power supply circuit because it's obviously not required for anything specific. Look, my TV appears to be fixed but will probably set my house on fire. I'll just share this on YouTube."

Does anyone have any idea how this will "fix" a flickering backlight? How can cutting a jumper magically fix it without causing more issues? Surely Samsung put the jumper in there for a reason.

[ZomBiE80]

Yeah, that might not be a smart thing, but still. Many designers forgot to tell manufacturers about their "revisions". I haven't seen this particular PSU though.

[BrianHG]

Notice the repair makes the TV really dim.
It seems it's most likely a failing power supply & cutting that trace runs the back-light at low power, so the power supply wont flicker in and out of over-current/under-voltage protection due to a failing cap or dying transformer or dying switching transistor.

[jim_griff]

I managed to find some people talking about a "Samsung bulletin" about this issue where the TV repair techs are meant to cut a particular jumper on the board, but I have my doubts. Can't find the original source.

Don't think I could ever follow advice like this! I'd want to know what's making it flicker and deal with the actual cause. If it worked before, something must have failed. Cutting a jumper seems like a silly thing to do to "fix" a TV, epsecially when it's cutting a jumper on the power supply board.