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donmacn

Member Since: 06 Nov 2017
Location: Nth Scotland
Posts: 1852

It's an LED Jim, but not as we know it....!

So,

I got an LED security spotlight on Amazon, £80 or thereabouts. Not long after i fitted it, some of the 'lines' of LEDs started to go. I got a prompt refund from the seller, and they weren't bothered about getting it back so it's just been up there, slowly fading away as more and more of the LEDs failed.

Now, it's completely dead. Replaced it today with a smaller, cheaper thing from Wickes.... let's see how long that lasts..

But... the same mental condition that makes we want to keep on fixing and improving an old Land Rover has kicked in. I've take the light apart. (I kid you not, the reflector is effectively a steak pie dish!) But this is the LED unit.

Click image to enlarge

Two soldered connections, some flexible silicon-like adhesive and some white grease-like stuff which I assume is a heat conducting paste.

The light was supposed to be 80watts - and it was pretty bright to start with. There are 100 LED 'chips' on the panel so presumably 1.25 watts per unit.....? Maybe.

Anyway, my questions goes out to anyone involved in LED trickery like this. Is a unit like this readily available? I assume so - and a lot cheaper than £80. I reckon I could easily put the thing back together again.

As always, any advice gratefully received.

Ta.

D Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html )
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

28th Jan 2018 8:07pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4796

Chances are pretty high that it's dry solder joints. Might be worth heating with a hot air gun to re flow the solder. Might bring it back to life

2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

28th Jan 2018 8:16pm

donmacn

Member Since: 06 Nov 2017
Location: Nth Scotland
Posts: 1852

Could certainly try that - never thought to photo the other side - it's actually a piece of aluminium. So the solder joints would be in the middle somewhere? Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html )
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

28th Jan 2018 8:25pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4796

It's probably dibond to provide a simple heat sink

28th Jan 2018 8:32pm

donmacn

Member Since: 06 Nov 2017
Location: Nth Scotland
Posts: 1852

Thanks Grafty, do you mean the white paste, or the 'aluminium'? Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html )
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

28th Jan 2018 8:36pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4796

I would imagine that they're mounted on dibond plastic, it's a layer of plastic with a thin layer of aluminium bonded on each side.

Without seeing it in person it's hard to tell.... 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

28th Jan 2018 8:44pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4796

Incidentally the panel looks perfect defender interior light size

28th Jan 2018 8:46pm

donmacn

Member Since: 06 Nov 2017
Location: Nth Scotland
Posts: 1852

Yea - that occurred to me too! Would be absolutely blinding!

Here's the other side of it. Without getting a magnifying glass onto it, it does look like it's a one piece thing rather than a sandwich or laminate but I guess not.

Click image to enlarge

Reckon the heat gun would still work here?

If not, what should I google to find a replacement? Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html )
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

28th Jan 2018 9:05pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4796

Looks like I can see layers there so could be dibond. Heat gun on the led side. Not too much heat but enough to melt the solder. I suppose as it's broken already you have nothing to loose

Not sure where you'll find a replacement 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

28th Jan 2018 9:19pm

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