Samsung UN32F5500AF backlight troubleshooting.

[BrokenYugo]

Last night TV powered up and then lost backlight after a few seconds (confirmed with flashlight), rebooting would sometimes get a flicker out of it. It is my assumption this points to either the backlight drive portion of the power supply (which looks to all be on the cold side of the power board) or the strips themselves since the computer and LCD are still running fine.

I went over that part of the power supply board with a DMM and checked all power diodes, electrolytic capacitors (no ESR test, just a visual and capacity in tolerance), and diode checked the two power MOSFETs, all look good. No cracked solder noted and TV was given a smack test before disassembly. When powered up I measured something like 190V on the 250V backlight driver input smoothing capacitor and 124V on the 200V output cap, which makes me think the driver (looks to be a buck converter) is running and the problem is likely the strips.

Does all that sound right? Just looking for some verification I'm barking up the right tree before I blow $20 on a set of LED strips from China. I don't have a suitable power supply handy to test the strips and don't fix TVs often enough to justify having one.

[kemet2330]

Sounds like it needs one more smack test.

[indeterminate]

It sounds like a blown led or bad crimp connector, you wont know until you open it up.
the point where it has failed is frequently burnt.