UE55D8000 Power Cycling On Off Issue

[mrdiy88]

Re: UE55D8000 Power Cycling On Off Issue

I have pm'd you back cheers

[vinceroger69]

Re: UE55D8000 Power Cycling On Off Issue

maybe these leds then
https://www.aliexpress.com/item/50PC...ceBeautifyAB=0

[mrdiy88]

Re: UE55D8000 Power Cycling On Off Issue

Thanks. Yes I think these are the ones. Mike is going to do hia best for me. Such a godsend. I love this forum it's brill

[diif]

Re: UE55D8000 Power Cycling On Off Issue

Here's a spectrum image of the LEDs, the one on the left is the new LED and the right the old.
Photos of the new and old LED also.

[diif]

Re: UE55D8000 Power Cycling On Off Issue

Another update, I replaced both of the missing LEDS either end, then noticed the next two had small chips in the plastic in the top so those have been replaced also.

I'll test them all in the morning.

[mrdiy88]

Re: UE55D8000 Power Cycling On Off Issue

Brilliant Mike. Thanks that is brill

[mmartell]

Re: UE55D8000 Power Cycling On Off Issue

diff how are you replacing these ? I can't see a way to solder them to the pads... what am I missing ?

[vinceroger69]

Re: UE55D8000 Power Cycling On Off Issue

diff how are you replacing these ? I can't see a way to solder them to the pads... what am I missing ?

i was going too ask the same question my guess a hot plate? maybe with solder paste?

[diif]

Re: UE55D8000 Power Cycling On Off Issue

Brilliant Mike. Thanks that is brill

You're welcome.

A photo attached of my setup.
I cleaned off the old solder before applying fresh with an iron.
Then stuck it on my hot plate. It's to see when the solder melts, then i placed the LED on top with tweezers.

[mmartell]

Re: UE55D8000 Power Cycling On Off Issue

That strip looks similar to mine it has a fairly beefy heatsink that the LEDs attach to. Tried heating with hot air wand underneath - no good. Tried using paste - not melting before the led does. Tried getting the tip of an iron just beneath the led at the pad - shitty iron couldn't supply enough heat before getting wicked away by the heatsink - better iron on the way

I'm not familiar with using a hot plate. Does the strip sit directly on it or is it advisable to have a small air gap ?

[diif]

Re: UE55D8000 Power Cycling On Off Issue

It sits on it flush, it transfers the heat into the aluminium the LEDs are mounted on. There is a gap above as it was quickly thrown together for the photo and the strip isn't perfectly level.
The heatsink should remove from the strip.
The hotplate is set to about 240c, once it's got to temperature I then place the LED strip on it, I then watch through my microscope for the solder to melt then I place the LED on it.

[mmartell]

Re: UE55D8000 Power Cycling On Off Issue

I guess the strip is mounted to the heatsink with screws ? If there is then there is a white plastic strip on the top covering them up...

[pedro89]

Re: UE55D8000 Power Cycling On Off Issue

So was the issue caused by the LEDs? Is the TV working now?

[mrdiy88]

Re: UE55D8000 Power Cycling On Off Issue

It was the leds. I sent them over to Mike but never heard back again so ended up selling the parts and dumping the tv at the recycling center.