Samsung UN55D6450 turns itself off and on endlessly, no blinks

[johnboy1313]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Again, after you get it open, and I can repeat the process, I'd like the backlight strips from you. I don't know how else I'd ever get any, so getting them from you would be amazingly fortuitous.

Edit: I typed this before a ton of replies but didn't press post. This is awesome! I'm glad there are some screws holding it together under that tape. So, the tape might be a little structural, but it's probably to prevent light leakage, eh?

Yeah. I would agree.

[johnboy1313]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

There are some slightly sticky rubber strips between the LCD and the casing. Be careful. It's not very sticky. But it could cause damage if you're not careful.

[johnboy1313]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Money shot. The LED strips are on the left and right sides. No LEDs on the top or bottom.

[mmartell]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Sweet

[mmartell]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

How many wires going to each led strip ?

[johnboy1313]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Again, after you get it open, and I can repeat the process, I'd like the backlight strips from you. I don't know how else I'd ever get any, so getting them from you would be amazingly fortuitous.

PM me.

[johnboy1313]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

How many wires going to each led strip ?

Eight

[mmartell]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Eight ?? Jesus, I only have four wires total going in, assuming I have two strips that's only two wires a piece. Quite a difference.

[johnboy1313]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

There are two harnesses running into the panel from the PSU. The harness for the left strip has ten wire at the PSU but only eight at the strip. The right has right at both ends.

[tom66]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Before you completely strip the set down, any chance of making voltage readings at each pin?

[johnboy1313]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Too late

[withalligators]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Ok, John's LED strips arrived and I tore the panel apart and inspected the LED strips. Sure enough, the left side (facing the rear) had a burnt out LED just a little up from the bottom. I swapped out that side and powered it up. Both sides lit (HOORAY!). I put it back together and now have a working set. All you folks who suspected a faulty LED strip should take a bow, you were right and I would have saved a lot of trouble had I just listened from the start.

So, now that's all back together I have horrible flashlighting on a black screen. I guess it's from separating the various diffuser layers. Has anyone had any luck fixing this? I was thinking of taking off it's bezel and laying it on something vibrating like a washing machine or something. Terrible idea?

Notes from disassembly: the black tape isn't structural, as there are plenty of screws hidden under it. It is to prevent light leakage though, and when assembled without it, you can see the silver screws through the clear bezel as well as light.

I have a left over LED strip from the right side, if anyone wants it, PM me.

[Ltank]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Glad for you. Curious about the LEDs that are soldered to the old boards that were removed from the set. Could you unsolder one LED from board and take a pic of the
markings so others can buy individual replacement LEDs in case the strips are not available. I have a set that may have same issue and I could build a test LED strip.
Thanks

[mmartell]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Is there writing on the underside ?

[Ltank]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

All electric parts have some type of marking. Sometimes a code that you must lookup online to determine what the part is. Top,Bottom or Side they are marked. So a Pic would
be great. If remove the bad LED and take a pic and or tell us the markings we can locate the part..thanks

[mmartell]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

I will take one off mine maybe tonight.

[mmartell]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Wow has anyone taken one of these off ? I am butcheting my board and they won't budge.

Here is a pic of the underside of the strip when you take it off the rail/heatsink it is screwed to. Maybe these numbers mean something to somebody (or google lol)

[tom66]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

This looks like a metal core PCB. It is probably not intended to be disassembled. The metal heatsinks the LEDs directly. The top side is probably ceramic which is a good thermal conductor. The two halves are probably bonded with thermal adhesive.

[mmartell]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Well that's not too good then...

[tom66]

Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

Can't you desolder the LEDs?