Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Home LED Flickers

On Monday, 17 December 2018 20:10:27 UTC, wrote:
On Sunday, December 16, 2018 at 4:25:43 PM UTC-5, tabby wrote:
On Sunday, 16 December 2018 20:46:34 UTC, wrote:
On Tuesday, December 11, 2018 at 7:44:07 PM UTC-5, wrote:


I got a 60W Equliv. LED bulb in a fixture that flickers all the time.
Its not very old. It does produce enough light but gets annoying after
awhile. They only cost a buck or two, so i'll just replace it, but I
wonder what is causing the flicker?

My guess is a cheap electrolytic in the rectifier, but I have never
really seen a schematic for how they are wired.

This is my opinion. They are made very cheaply they aren't made with much shielding so anything can cause them to flicker.


that simply isn't so. The nature of the circuits makes them robust against RFI.


NT


Nevermind my comment on RF. I had my thought train crossing.

I do think these are made cheaply and they would have to be in order to turn a profit. As far as RF, nah that isn't going to cause flicker. The bulb itself is DC and if there was any RF it would simply be super imposed onto a DC bias which the amplitude from any RFI would be so insignificant and wouldn't matter because well it's a diode. The driver shouldn't respond to RFI because it's an AC/DC converter and the DC is probably being switched which alone would cause RF. Just the AC is creating a field.


The reason the driver doesn't cause flicker in response to RFI is it consists of
1. rectifier & reservoir, which couldn't care less what comes its way
2. oscillator, which is too busy slamming into one rail after the other for rfi to make much difference.

If there were low level analogue signals getting amplified it might be a different story.


I really couldn't say exactly what is causing the flicker because I am not present to check the entire circuit.


the OP never gave us enough info to narrow it down at all.


NT
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On Monday, December 17, 2018 at 3:55:22 PM UTC-5, wrote:
On Monday, 17 December 2018 20:10:27 UTC, wrote:
On Sunday, December 16, 2018 at 4:25:43 PM UTC-5, tabby wrote:
On Sunday, 16 December 2018 20:46:34 UTC, wrote:
On Tuesday, December 11, 2018 at 7:44:07 PM UTC-5, wrote:

I got a 60W Equliv. LED bulb in a fixture that flickers all the time.
Its not very old. It does produce enough light but gets annoying after
awhile. They only cost a buck or two, so i'll just replace it, but I
wonder what is causing the flicker?

My guess is a cheap electrolytic in the rectifier, but I have never
really seen a schematic for how they are wired.

This is my opinion. They are made very cheaply they aren't made with much shielding so anything can cause them to flicker.

that simply isn't so. The nature of the circuits makes them robust against RFI.


NT


Nevermind my comment on RF. I had my thought train crossing.

I do think these are made cheaply and they would have to be in order to turn a profit. As far as RF, nah that isn't going to cause flicker. The bulb itself is DC and if there was any RF it would simply be super imposed onto a DC bias which the amplitude from any RFI would be so insignificant and wouldn't matter because well it's a diode. The driver shouldn't respond to RFI because it's an AC/DC converter and the DC is probably being switched which alone would cause RF. Just the AC is creating a field.


The reason the driver doesn't cause flicker in response to RFI is it consists of
1. rectifier & reservoir, which couldn't care less what comes its way
2. oscillator, which is too busy slamming into one rail after the other for rfi to make much difference.

If there were low level analogue signals getting amplified it might be a different story.


I really couldn't say exactly what is causing the flicker because I am not present to check the entire circuit.


the OP never gave us enough info to narrow it down at all.


NT




the OP never gave us enough info to narrow it down at all.

is basically a reiterating of what i said. i'm not present in the persons home.

RF isn't a problem anyways because the only signal with great enough amplitude to cause problems are at such low frequencies. there simply isn't enough energy. shorter wavelength = higher frequency = higher energy. i can tell you though if you hooked up an oscilloscope you probably could pickup signalling from something around, but again it's all being fed to a diode one way or another.
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On Monday, December 17, 2018 at 3:55:22 PM UTC-5, wrote:
On Monday, 17 December 2018 20:10:27 UTC, wrote:
On Sunday, December 16, 2018 at 4:25:43 PM UTC-5, tabby wrote:
On Sunday, 16 December 2018 20:46:34 UTC, wrote:
On Tuesday, December 11, 2018 at 7:44:07 PM UTC-5, wrote:

I got a 60W Equliv. LED bulb in a fixture that flickers all the time.
Its not very old. It does produce enough light but gets annoying after
awhile. They only cost a buck or two, so i'll just replace it, but I
wonder what is causing the flicker?

My guess is a cheap electrolytic in the rectifier, but I have never
really seen a schematic for how they are wired.

This is my opinion. They are made very cheaply they aren't made with much shielding so anything can cause them to flicker.

that simply isn't so. The nature of the circuits makes them robust against RFI.


NT


Nevermind my comment on RF. I had my thought train crossing.

I do think these are made cheaply and they would have to be in order to turn a profit. As far as RF, nah that isn't going to cause flicker. The bulb itself is DC and if there was any RF it would simply be super imposed onto a DC bias which the amplitude from any RFI would be so insignificant and wouldn't matter because well it's a diode. The driver shouldn't respond to RFI because it's an AC/DC converter and the DC is probably being switched which alone would cause RF. Just the AC is creating a field.


The reason the driver doesn't cause flicker in response to RFI is it consists of
1. rectifier & reservoir, which couldn't care less what comes its way
2. oscillator, which is too busy slamming into one rail after the other for rfi to make much difference.

If there were low level analogue signals getting amplified it might be a different story.


I really couldn't say exactly what is causing the flicker because I am not present to check the entire circuit.


the OP never gave us enough info to narrow it down at all.


NT


RF aside the simple answer is it flickers because the person didn't install it correctly, the wiring is crap, or the lamp is a POS. they are made to be replaced
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On Monday, 17 December 2018 21:30:25 UTC, wrote:
On Tuesday, December 11, 2018 at 7:44:07 PM UTC-5, wrote:


I got a 60W Equliv. LED bulb in a fixture that flickers all the time.
Its not very old. It does produce enough light but gets annoying after
awhile. They only cost a buck or two, so i'll just replace it, but I
wonder what is causing the flicker?


RF aside the simple answer is it flickers because the person didn't install it correctly, the wiring is crap, or the lamp is a POS. they are made to be replaced


Or one of the other usual reasons.


NT
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Default Home LED Flickers

On Wednesday, December 12, 2018 at 10:18:52 AM UTC-5, wrote:
On Wednesday, December 12, 2018 at 9:37:20 AM UTC-5, wrote:
On Wednesday, 12 December 2018 13:26:18 UTC, wrote:

There are two parts of an LED lamp/fixture.

a) The LED emitters themselves: These are pretty generic beasts, and while not-quite-one-size-fits-all, the same emitter may provide light from between 3000K to 5000K. They are also pretty bullet-proof.


in excellent quality lamps maybe. Not at all bullet-proof in domestic LED lights.


Possibly true, but the failure mode of an emitter is not flicker.


A broken bonding wire will cause a flicker as it heats, then opens. It cools and comes back on. Not that you actually know anything about Semiconductors and how the dies connect to the outside world. Stick with your junk, tube amplifiers and radios.

I have done autopsies on a handful of failed LED bulbs Every one so far has had the case vent on the Electrolytic capacitor, and spraying the electrolyte inside the plastic case. The bulbs are easy to open. A thin film of RTV holds the dome on the bas. Twist it and it breaks free. Once they are open, there are two solder pads from the bottom part. Unsolder them, and you can replace the electrolytic. I was more interested in converting some of the to 12Volts instead of repairing them. The internal construction was identical on the $1 Sunbeam bulbs as higher priced, better known brands.
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Default Home LED Flickers

On 4/12/19 12:32 PM, Michael Terrell wrote:
Take your own advice, Texas is full of rocks.


Go **** yourself.


--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
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