General > General Technical Chat
The "magic Smoke" LED light
innkeeper:
TEARDOWN:
the burn spot corralates to the top side of the pcb, right about where the UL Listed symbol is (ironic)
It is potted, i'll have to see if i can remove the potting material.
any suggestions?
Towger:
Dremel
Red Squirrel:
They should maybe start using fire retardant filler in these things. If it does catch on fire it will just foam up and smother the fire.
Electro Detective:
Magic Smoke should make its appearance on workbenches or sheds, not childrens rooms :-- :--
I still use old school incandescent globes and 12v downlights, with dimmers and ON-OFF switches to save money
The light quality is SUPERIOR, easy on the eyes (and brain)
and no surprise ceiling mini barbeques :o
innkeeper:
TEAR DOWN PART II:
Dremel worked great. the potting material is kind of semi soft material and i can peel it off or break it in chunks.
not sure what kind of potting compound it is, but its not the solid epoxy type.
i peeled it back enough to get to the area that burnt on the other light.
Two shots of the tear down below. the area i have circled in red is the area were it burnt though on the bad one.
it appers very likely that either power transistor/mosfet type device got hot or the resistor above it and likely melted /burned the potting material and base area.
turns out the base area was not ceramic but plastic. The potting compound dosn't seem thermally conductive. It was likely there to keep it safe from the elements.
this should also answer the question on if the circuit it was a crappy cap dropper. it does seems like more of a proper circuit to drive the led.
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