UN55D6000 Blinking Standby Light

[CoryDavis]

Re: UN55D6000 Blinking Standby Light

I have bad LED strip also. Anyone have a good strip for sale or found out where we can buy LED?

[mmartell]

Re: UN55D6000 Blinking Standby Light

There is a part number for the strip - I would have to find it again. Its in the exploded parts list but it's useless anyhow.

The jumpers I have made seem unreliable as the space between the leds is so small you must essentially heat up both joints at the same time. Tricky.

I'm not worried about the traces at all if I can find a reliable way to connect the leds together.

[Ltank]

Re: UN55D6000 Blinking Standby Light

Yea, I know. Its a Pride thing of fixing it and not letting it Win. The LED strips have no part number in the Service Manual and are considered part of the pannel and not sold or to be replaced.. We all know when the Pannel is toast the boards get parted out. I had this set for a while and reading about troubleshooting these sets, it gave me want to see for myself and fix it as a Challenge. As I read from this Excellent Forum , there is no shortage of Challanges!

[freakaftr8]

Re: UN55D6000 Blinking Standby Light

man don't let it get you down. After all think about it it's just an LED strip in your learning its not like the TVs is ruined or anything

[Ltank]

Re: UN55D6000 Blinking Standby Light

I will try a Dremel on the bad board come Monday. Eventually I hope to figure how to cleanly remove the LEDs with repeatable success. I can see why Samsung dont use these anymore. The 2011SV55 search shows at least two different types of LED strips for the same number. I dont know if I can damage more that it is already. I am saddened that it has come to this. I take pride in my work and with over 28 years in Industrial electronics I never had this kind of problem. Fustrating for Sure!

[freakaftr8]

Re: UN55D6000 Blinking Standby Light

Anyone thought of using a dremel?

[Ltank]

Re: UN55D6000 Blinking Standby Light

It seems the LEDs are glued with a heat conductive glue that is bonded to the strip, then the 4 leads are soldered but only 2 are used. the Led had a metal bottom that conducts heat and gets glued down.
When pushing the Exacto knife at edge of LED it came loose suddenly ripping the lands off the strip. (once) Then I tried a Xtronic tool with IR heat on bottom and Hot air wand on top did nothing. Then tired a a 45 watt larger tip to unsolder both leaeds at once on each side but it was too much head and the small trace came unglued. (2 times)
I was able to use big iron from longer side of led that melted the led and the heat transfered to the leads and it came off cleanly. (2 times). then tried same twice again but not as pretty. Small jumpers can be made for some between the leds. I tried cutting the leds in half but that also damaged traces when they poped up when being cut.

[mmartell]

Re: UN55D6000 Blinking Standby Light

How did you ruin the board if the leds you were attempting to remove were shorted or open already ?

[Ltank]

Re: UN55D6000 Blinking Standby Light

The Leds have 4 leads but only two are used. Looking through the mary variations of the Seoul Acrich Series LEDs i concluded that this is the correct
one to use. See page 4 for Schematic and dimentions. I ordered 30 from DigiKey 897-1093-6-ND STW8Q14BE-U0U7-BA SMD Cool White 5650 Leds

I contacted a member here and hopefully we can work something out on his units that needs and Led or two. I bought extra to practice with as they seem to be glued in with a high temp thermal conducting adheasive and the leads are soldered. I have ruined my board practicing on what not to to do but have not got the hang of what to do repeatably without damaging the board.

[mmartell]

Re: UN55D6000 Blinking Standby Light

LTank check your PM

[mmartell]

Re: UN55D6000 Blinking Standby Light

GRRRR!. Man, I used wick with a pretinned tip to transfer the heat to remove solder the leads. Then used Exacto-Knife so blade was parallel with aluminum strip to attempt to get it to go under the LED. I dont have the gentle touch no more it pushed too far breaking the LED and tearing the pads off. Bummer.TWICE! Three others the pads were dammaged from too much heat. With the LEDS being glued they dont come off after being unsoldered. VERY FUSTRATING!

Don't worry about breaking the leds, they are already broken. As for the pads I could never find where they were soldered anyhow and the spacing is so fine it's not worth the bother. Solder them with a jumper to the ones to the left and right.

A good bit of downward force all at once and they should "pop" off. You want to stay parallel to the strip because there are traces that run the length of the leds, depending on grouping amount.

If you have 19 dead leds then you have many to practice on to get it right. Then you will be able to harvest good ones from a donor strip and glue them in place. Don't give up !

[mmartell]

Re: UN55D6000 Blinking Standby Light

Harvested from a strip from another set. I still have no idea where to source them from individually.

[Ltank]

Re: UN55D6000 Blinking Standby Light

GRRRR!. Man, I used wick with a pretinned tip to transfer the heat to remove solder the leads. Then used Exacto-Knife so blade was parallel with aluminum strip to attempt to get it to go under the LED. I dont have the gentle touch no more it pushed too far breaking the LED and tearing the pads off. Bummer.TWICE! Three others the pads were dammaged from too much heat. With the LEDS being glued they dont come off after being unsoldered. VERY FUSTRATING!

[budm]

Re: UN55D6000 Blinking Standby Light

So where are the LEDs from? Good to see it running.

[mmartell]

Re: UN55D6000 Blinking Standby Light

Haha you are thinking much too high tech. I used an exacto knife. Stand the strip on edge so the leds are vertical and push the knife straight down under it. Requires a little force. Once done a couple of times you will be able to remove them cleanly.

[Ltank]

Re: UN55D6000 Blinking Standby Light

I humbly bow to your success! Well I have not been sucessful in removing the Leds. I tried my X-Tronic Preheater and Hot Air Wand,no luck. Tried Zepher and QuikChip Low melt solder and two different Soldering Irons and now really agrivated with myself. I did indusdtrial electronics for 28years and never had this kind of problem trying to remove an LED. May I ask what Iron or station did you use? Wattage? Tempature? Tip style and width? Did you use heat. Were the little Suckers glued down then soldered?
I am asking because I have 20 to remove and replace and I cant seem to get One off!
I want to give up but its pricipal of it now and I am not to proud to ask for help.
What Led did you use? Thanks

[freakaftr8]

Re: UN55D6000 Blinking Standby Light

Good job! Again. Lol

[Ltank]

Re: UN55D6000 Blinking Standby Light

What was the part# and whom did you buy from? Digikey? Mouser?

[johnboy1313]

Re: UN55D6000 Blinking Standby Light

Nice job!

[mmartell]

Re: UN55D6000 Blinking Standby Light

Repaired. Again.

Replaced three leds. Hardest part is wiring in the jumpers to complete the circuit because there isn't a lot of room between the leds and I couldn't make a functional solder bridge.

Placed a light bead of solder paste down the back of where the leds are mounted before remounting the strip to the back plate.

In the midst of a 12hour burn-in right now. Will check on them in the morning.

In the first photo leds 6 and 7 from the right have been replaced.