I have a flickering LED downlight in the kitchen. It's not the PSU,
I've run it from a bench supply and it still flickers. It has a three
position switch to change the colour temperature and the LED comprises a
17x20mm white board with two multiple chip LEDS, a central warm white
and an outer ring of daylight. Te switch selects either or both. Only
the warm white flickers, but this is the one we use. It's not the
switch, I tried swapping the wires and there's no electronics in there.

This is a 30V 10W device, I could easily fix it if I could source the
LED module, but I can's find a source - any ideas?

I don't want to replace the whole unit as there are others which it
matches and I don't think the same model is available.

--
Cheers
Clive

On 28/03/2021 17:13, Clive Arthur wrote:
I have a flickering LED downlight in the kitchen.Â* It's not the PSU,
I've run it from a bench supply and it still flickers.Â* It has a three
position switch to change the colour temperature and the LED comprises a
17x20mm white board with two multiple chip LEDS, a central warm white
and an outer ring of daylight. Te switch selects either or both. Only
the warm white flickers, but this is the one we use.Â* It's not the
switch, I tried swapping the wires and there's no electronics in there.

This is a 30V 10W device, I could easily fix it if I could source the
LED module, but I can's find a source - any ideas?

I don't want to replace the whole unit as there are others which it
matches and I don't think the same model is available.



That's the downfall of LED.

It's ****ed so you have to bin it and replace the whole unit (in most
cases).

--
Adam

On 28/03/2021 17:13, Clive Arthur wrote:
I have a flickering LED downlight in the kitchen.Â* It's not the PSU,
I've run it from a bench supply and it still flickers.Â* It has a three
position switch to change the colour temperature and the LED comprises a
17x20mm white board with two multiple chip LEDS, a central warm white
and an outer ring of daylight. Te switch selects either or both. Only
the warm white flickers, but this is the one we use.Â* It's not the
switch, I tried swapping the wires and there's no electronics in there.

This is a 30V 10W device, I could easily fix it if I could source the
LED module, but I can's find a source - any ideas?

I don't want to replace the whole unit as there are others which it
matches and I don't think the same model is available.

I have found that LEDS like to flicker

Any or all of my kitchen ones will interact with each other even though
they are on different dimmers.

When I had a desk light plugged into my bench and I was using a belt
sander on an adjacent socket the LED would sometimes flicker when the
belt sander was switched off.

The LEDS in my office here sometimes flicker on voltage surges too

Perhaps an RF choke in series?

LED technology is still work in progress

--
"In our post-modern world, climate science is not powerful because it is
true: it is true because it is powerful."

Lucas Bergkamp

On 28/03/2021 17:13, Clive Arthur wrote:
I have a flickering LED downlight in the kitchen.Â* It's not the PSU,
I've run it from a bench supply and it still flickers.Â* It has a three
position switch to change the colour temperature and the LED comprises a
17x20mm white board with two multiple chip LEDS, a central warm white
and an outer ring of daylight. Te switch selects either or both. Only
the warm white flickers, but this is the one we use.Â* It's not the
switch, I tried swapping the wires and there's no electronics in there.

This is a 30V 10W device, I could easily fix it if I could source the
LED module, but I can's find a source - any ideas?

I don't want to replace the whole unit as there are others which it
matches and I don't think the same model is available.


What's the make and model? Does it flicker when both LED strings are ON?
Does varying the bench PSU slightly either side of 30v affect the
flicker ?

PA

On 28/03/2021 18:19, ARW wrote:
On 28/03/2021 17:13, Clive Arthur wrote:
I have a flickering LED downlight in the kitchen.Â* It's not the PSU,
I've run it from a bench supply and it still flickers.Â* It has a three
position switch to change the colour temperature and the LED comprises
a 17x20mm white board with two multiple chip LEDS, a central warm
white and an outer ring of daylight. Te switch selects either or both.
Only the warm white flickers, but this is the one we use.Â* It's not
the switch, I tried swapping the wires and there's no electronics in
there.

This is a 30V 10W device, I could easily fix it if I could source the
LED module, but I can's find a source - any ideas?

I don't want to replace the whole unit as there are others which it
matches and I don't think the same model is available.



That's the downfall of LED.

It's ****ed so you have to bin it and replace the whole unit (in most
cases).

Well if its a bulb that ain't a lot...

I am beginning to think that the capacitor dropper type circuitry is
extremely sensitive to RF and voltage spikes.

A few turns ow maind wire in a ferrite donut may help
--
There is nothing a fleet of dispatchable nuclear power plants cannot do
that cannot be done worse and more expensively and with higher carbon
emissions and more adverse environmental impact by adding intermittent
renewable energy.

On 28/03/2021 18:19, ARW wrote:
On 28/03/2021 17:13, Clive Arthur wrote:
I have a flickering LED downlight in the kitchen.Â* It's not the PSU,
I've run it from a bench supply and it still flickers.Â* It has a three
position switch to change the colour temperature and the LED comprises
a 17x20mm white board with two multiple chip LEDS, a central warm
white and an outer ring of daylight. Te switch selects either or both.
Only the warm white flickers, but this is the one we use.Â* It's not
the switch, I tried swapping the wires and there's no electronics in
there.

This is a 30V 10W device, I could easily fix it if I could source the
LED module, but I can's find a source - any ideas?

I don't want to replace the whole unit as there are others which it
matches and I don't think the same model is available.



That's the downfall of LED.

It's ****ed so you have to bin it and replace the whole unit (in most
cases).

Yes. I am glad to say that the only LED unit we have is a single, flush
mounted unit, so if it fails, I can replace it without worry about
matching. The rest are fittings with GU10s, MR16s, E27s or BC22s, so
easy to sort out.

Clive Arthur wrote:
This is a 30V 10W device, I could easily fix it if I could source the
LED module, but I can's find a source - any ideas?

If it's a branded unit, try the manufacturer. If it's not a branded unit,
try fishing on Aliexpress.

Theo

"The Natural Philosopher" wrote in message
...
On 28/03/2021 17:13, Clive Arthur wrote:
I have a flickering LED downlight in the kitchen. It's not the PSU, I've
run it from a bench supply and it still flickers. It has a three
position switch to change the colour temperature and the LED comprises a
17x20mm white board with two multiple chip LEDS, a central warm white and
an outer ring of daylight. Te switch selects either or both. Only the
warm white flickers, but this is the one we use. It's not the switch, I
tried swapping the wires and there's no electronics in there.

This is a 30V 10W device, I could easily fix it if I could source the LED
module, but I can's find a source - any ideas?

I don't want to replace the whole unit as there are others which it
matches and I don't think the same model is available.

I have found that LEDS like to flicker

None of my Philips Hues do.

Any or all of my kitchen ones will interact with each other even though
they are on different dimmers.

None of my Philips Hues do.

When I had a desk light plugged into my bench and I was using a belt
sander on an adjacent socket the LED would sometimes flicker when the belt
sander was switched off.

None of my Philips Hues do.

The LEDS in my office here sometimes flicker on voltage surges too

None of my Philips Hues do.

Perhaps an RF choke in series?

LED technology is still work in progress

Not with the best of them.

On Mon, 29 Mar 2021 06:17:04 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the trolling senile cretin's latest troll****

--
dennis@home to retarded trolling senile Rodent:
"sod off rod you don't have a clue about anything."
Message-ID:

Not sure, the fact that all the leds in that cluster flicker so more like a
connection issue. Are you saying that the bit that is faulty can in fact be
removed on its own? If so then I bet somebody makes them, the snag of course
is that they probably ship them only to the lamp makers in large quantities
and probably in China.
Brian

--

This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"The Natural Philosopher" wrote in message
...
On 28/03/2021 18:19, ARW wrote:
On 28/03/2021 17:13, Clive Arthur wrote:
I have a flickering LED downlight in the kitchen. It's not the PSU, I've
run it from a bench supply and it still flickers. It has a three
position switch to change the colour temperature and the LED comprises a
17x20mm white board with two multiple chip LEDS, a central warm white
and an outer ring of daylight. Te switch selects either or both. Only
the warm white flickers, but this is the one we use. It's not the
switch, I tried swapping the wires and there's no electronics in there.

This is a 30V 10W device, I could easily fix it if I could source the
LED module, but I can's find a source - any ideas?

I don't want to replace the whole unit as there are others which it
matches and I don't think the same model is available.



That's the downfall of LED.

It's ****ed so you have to bin it and replace the whole unit (in most
cases).

Well if its a bulb that ain't a lot...

I am beginning to think that the capacitor dropper type circuitry is
extremely sensitive to RF and voltage spikes.

A few turns ow maind wire in a ferrite donut may help
--
There is nothing a fleet of dispatchable nuclear power plants cannot do
that cannot be done worse and more expensively and with higher carbon
emissions and more adverse environmental impact by adding intermittent
renewable energy.

On 29/03/2021 10:20, Brian Gaff (Sofa) wrote:
Not sure, the fact that all the leds in that cluster flicker so more like a
connection issue. Are you saying that the bit that is faulty can in fact be
removed on its own? If so then I bet somebody makes them, the snag of course
is that they probably ship them only to the lamp makers in large quantities
and probably in China.
Brian


Yes, it's looking impossible to find one which will fit and have the
same voltage, and I don't need dual colour, just warm white would do.
The postage stamp sized COB LED can be removed - the whole thing seems
to be quite well made, though there's no part number. Surprisingly the
bezel is held on with four Neodymium magnets

The flickering is usually followed by a blackout after several minutes,
even when connecting directly onto the LED. Dodgy bond wire, I suspect.

--
Cheers
Clive

On 29/03/2021 10:59, Clive Arthur wrote:
On 29/03/2021 10:20, Brian Gaff (Sofa) wrote:
Not sure, the fact that all the leds in that cluster flicker so more
like a
connection issue. Are you saying that the bit that is faulty can in
fact be
removed on its own? If so then I bet somebody makes them, the snag of
course
is that they probably ship them only to the lamp makers in large
quantities
and probably in China.
Â* Brian


Yes, it's looking impossible to find one which will fit and have the
same voltage, and I don't need dual colour, just warm white would do.
The postage stamp sized COB LED can be removed - the whole thing seems
to be quite well made, though there's no part number.Â* Surprisingly the
bezel is held on with four Neodymium magnets

The flickering is usually followed by a blackout after several minutes,
even when connecting directly onto the LED.Â* Dodgy bond wire, I suspect.

What is in a LED these days is not a given. There seem to be several
different driver styles. The technology has been rushed to market on a
wave of EcoBollox and its all still buggy as hell.




--
"It is an established fact to 97% confidence limits that left wing
conspirators see right wing conspiracies everywhere"

On 28/03/2021 18:19, ARW wrote:
On 28/03/2021 17:13, Clive Arthur wrote:
I have a flickering LED downlight in the kitchen.Â* It's not the PSU,
I've run it from a bench supply and it still flickers.Â* It has a three
position switch to change the colour temperature and the LED comprises
a 17x20mm white board with two multiple chip LEDS, a central warm
white and an outer ring of daylight. Te switch selects either or both.
Only the warm white flickers, but this is the one we use.Â* It's not
the switch, I tried swapping the wires and there's no electronics in
there.

This is a 30V 10W device, I could easily fix it if I could source the
LED module, but I can's find a source - any ideas?

I don't want to replace the whole unit as there are others which it
matches and I don't think the same model is available.



That's the downfall of LED.

It's ****ed so you have to bin it and replace the whole unit (in most
cases).


Well, I took the LED out for a closer look. It comprises two sets of
LEDs, an outer ring of 'daylight' and an inner circle of 'warm white'.
Each of these comprises 18 LEDs, and as it's rated at 30V that suggests
that each set of LEDs is two parallel strings of 9 in series, and indeed
you can see that with a magnifier.

So it's likely not a bond wire, though I've seen that failure in single
LEDs before. It seems there may be some invisible thermal cut out -
maybe a polyswitch type of device.

So I wired the LED up to the bench PSU again, and sure enough,
flickering then extinguishing. I stuck it to an ally box with heatsink
compound and hey Presto, it worked!

So I reassembled it with fresh heatsink compound and it's been on for an
hour now. (In fact it's not heatsink compound, it's diamond grinding
paste, but hey.)

So the moral of the story is, if your cheap-as-chips LED downlighter
goes wrong, you can spend a couple of hours looking for a replacement
and a couple of hours experimenting and fixing when you should be
working at a fairly decent hourly rate.

Still, SWMBO is pleased, and that's all that matters.

--
Cheers
Clive