Samsung UE55H8000 Backlight Power Problem

[Bloopeta]

Have a Samsung UE558000, which I thought was just going to be a straightforward backlight replacement, as the screen was dark in the middle.

After stripping it down, I noticed it was exactly the same lights out on both sides (see pic)

I tested the strips with LED tester, and no bulbs were out, so I tested the voltage going to the strips, both at the board side, and at the strip.

On Blue, there is 30.5v on pin 3 and 9, but nothing on the others.
Same situation on White, 30.5v pin 2 and pin 8

All caps look ok, anyone any idea?

[thommyX]

Re: Samsung UE55H8000 Backlight Power Problem

Put the mainboard from the power supply, then does the lighting go completely?
Then put both plugs off the Tcon. What happens then?
Show all three LEDs on the TCON when everything is connected?
It is possible that your two LED drivers IC SLC3014M are defective or the error comes from a defective panel.

LG Thomas

[Bloopeta]

Re: Samsung UE55H8000 Backlight Power Problem

Put the mainboard from the power supply, then does the lighting go completely?
Then put both plugs off the Tcon. What happens then?
Show all three LEDs on the TCON when everything is connected?
It is possible that your two LED drivers IC SLC3014M are defective or the error comes from a defective panel.

LG Thomas

I changed the power board and that sorted it