Samsung UN60FH6200F TV - No backlight - Please help

[Snipeye]

Re: Samsung UN60FH6200F TV - No backlight - Please help

Good news - I figured it out! There were three resistors blown on the back side of the board, near where the LEDs plug in. They were, from the shopjimmy picture, supposed to be 3R00 resistors, in parallel, and I'm guessing they were just acting as a fuse. I measured one at 16Mohm after desoldering it, and guessing that that was the problem, shoved a beefy 1.5ohm resistor in their place. Worked like a charm.

(Note that I will not mention the brief moment there was a 47 ohm resistor there to see if it worked... and the blue smoke it released).

[Snipeye]

Re: Samsung UN60FH6200F TV - No backlight - Please help

@budm, I was getting ~400v IIRC.

[Dannyx]

Re: Samsung UN60FH6200F TV - No backlight - Please help

Those are current sense resistors if I'm not mistaken, by your description. They're paralleled to drop the resistance quite low so they don't have too much voltage drop across them. I've never seen a TV where those resistors were faulty, but I guess there's a first time for everything...

[budm]

Re: Samsung UN60FH6200F TV - No backlight - Please help

@budm, I was getting ~400v IIRC.

Since the current sensing resistors went open circuit, that is why you are getting 400V.

[emmy1]

Re: Samsung UN60FH6200F TV - No backlight - Please help

what are the values of the 3 resistors on the back near the connector that are in parallel (R9151-R9153) mine are burned

[R_J]

Re: Samsung UN60FH6200F TV - No backlight - Please help

All 3 are marked as 3R00 which are 3Ω each

[jasonkhonlaw]

Re: Samsung UN60FH6200F TV - No backlight - Please help

@budm, I was getting ~400v IIRC.

I know this is SUPER old, but can you tell me what power rating the 1.5ohm resistor you used had on it? My power board has the same exact issue. Thanks!

[Dannyx]

Re: Samsung UN60FH6200F TV - No backlight - Please help

I know this is SUPER old, but can you tell me what power rating the 1.5ohm resistor you used had on it? My power board has the same exact issue. Thanks!

Power can be determined by their size, though it never hurts to go bigger if unsure.