An autopsy of a higher profile LED lamp, courtesy of Matt. This is a very chunky module with an intriguing double-insulated construction that involves the driver being in a fully enclosed plastic housing including a cable port that protrudes through the alloy heatsink onto the PCB that is presumably a high thermal conductivity laminate as opposed to the more common aluminium core PCB's.
This unit seems to use a series array of LEDs that each contain two chunky chips giving a combined forward voltage of about 6 to 7 volts on each of the 18 emitters. That gives a combined panel voltage of around 108V to 126V. Each emitter also seems to have a reverse silicon diode drop too, suggesting reverse polarity protection.
The panel was exhibiting an unusual failure mode of 10 of the 18 emitters being short circuit. This may have been due to the normal failure mode of gallium nitride emitters, or it may have been a deliberate open circuit shunt system to allow a high level of LED redundancy in the event of failure. That would allow the fixture to continue operating at reduced intensity as each emitter failed.
The thermal cracks on the emitter resin, silkscreen and cable suggested that the panel had been operating for a long time at a high temperature.
The driver is notable for the high level of input and output suppression to comply with EMC standards.
The strobing is common in modern drivers when they fail or the load is abnormal.
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This unit seems to use a series array of LEDs that each contain two chunky chips giving a combined forward voltage of about 6 to 7 volts on each of the 18 emitters. That gives a combined panel voltage of around 108V to 126V. Each emitter also seems to have a reverse silicon diode drop too, suggesting reverse polarity protection.
The panel was exhibiting an unusual failure mode of 10 of the 18 emitters being short circuit. This may have been due to the normal failure mode of gallium nitride emitters, or it may have been a deliberate open circuit shunt system to allow a high level of LED redundancy in the event of failure. That would allow the fixture to continue operating at reduced intensity as each emitter failed.
The thermal cracks on the emitter resin, silkscreen and cable suggested that the panel had been operating for a long time at a high temperature.
The driver is notable for the high level of input and output suppression to comply with EMC standards.
The strobing is common in modern drivers when they fail or the load is abnormal.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
2.10 those are street light LEDs if a dot is faulty can you use a resistor or diode to restore the lamp? I fixed a street light last week and found that some dots shorted out preventing power supply start . Many lamps I fix have swollen capacitor somewhere. module is insulated like our African 24 max.
This one we know well here in Africa as a 24 volt max lamp running full brightness as little as 6 volt and very popular as truck and trailer lights. Am now commenting on the look now will watch your video on it. 3.30 am here in Eswatini and can't sleep due to all night prayer service next door. Zionists are loud
I would have been interested in seeing how it behaved with a somewhat lower voltage, say with the use of a variac. If it would have continued to pulse like that. And as far as big chunks of metal are concerned, I don't throw stuff like that away, I take it for a ride to a place that give me money for it. 🙂
What, no schematic? You don't have 10 hours spare to trace all 50 microscopic components on there?
an mp4 chip i didnt know it could play that file type . im not that dumb lol i kn ow its not an mp4 player chip unless i miss heard it lol
How many Watts is this??
thanx man… awesome vedios
Osram makes good stuff.
I always wish to able to speak like that accent 😎😎
How come the guys who make high power lasers, made crappy LED?
Next up, BC and his aluminium casting orchestra
My experience with led replacements for tungsten & compact fluorescents is that Poundland ones last best.
You should heat that led board up and look at it under a thermal camera.
So, those output wires aren't silicone insulated?
Perhaps a better strategy would have been to use an isolated driver, which would allow mounting the LEDs on a normal MCPCB?
Can I send you some stuff?
Yikes, don't like the design of that ballast, browning of the PCB like that is a sign of very high temperatures …