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Help identifying transistor
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ralun:
Hi! I have a broken led light I'm trying to fix, bought it second hand and it had gotten in to contact with saltwater.
The water caused some corrosion to a headerstrip, and a transistor which I think is part of the thermal protection is broken.

The problem is that I can't identify the transistor, it's marked with either B2H2 or 82H2, neither of which I'm able to find as a corresponding code.
I've attached two images of the transistor and the pcb it's on, if someone could help me out it would be great.
bsfeechannel:
It can be a voltage regulator, not a transistor.
magic:
U1 suggests it is indeed some IC rather than a transistor. A transistor would be Q-something.

What makes you think it's broken? If it's only a matter of corrosion on the upper solder joint, removing the old solder and applying new will get it to working condition unless the leg of the IC is completely rusted through.
scatterandfocus:
Crazy times, when the components have gotten so small that an IC looks like a transistor, like a a resistor, like a capacitor, like an inductor.  In another 20 years, electronic components will have vaporized.   :-DD
ralun:

--- Quote from: magic on September 18, 2019, 06:49:00 am ---U1 suggests it is indeed some IC rather than a transistor. A transistor would be Q-something.

What makes you think it's broken? If it's only a matter of corrosion on the upper solder joint, removing the old solder and applying new will get it to working condition unless the leg of the IC is completely rusted through.

--- End quote ---

Yes the U1 had me thinking it was something else than a transistor, but it tests out like a transistor. And then the fact that it seems to be part of the thermal protection makes me wonder if it isn't a bit of an overkill to use an IC rather than a transistor?

I should have been a bit more clear on the picture, the light I'm fixing has two identical led-PCBs, the picture is from the other pcb and it is still working.
When testing the broken transistor it reads 2 Ohms (would the take number with a tub of salt as I only have a cheap multimeter) between the upper leg and the left leg, in both directions.
The other leg and the other transistor reads ~500 Ohms in one direction only from the upper leg. The other one also reads ~1k Ohm from the left leg to the right leg.

I edited the picture of the pcb to make it easier to see some of the lanes.
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