No-name GU10 LED lamp teardown

In the usual Kuzyatech fashion, when something breaks, we must take it apart. Today, one of the  “early adopter” GU10 style LED lamps decided to fail mechanically:

We have a problem

We have a problem

Quality control

Quality control!

Hmm, The power supply is wrapped in some tape

The power supply is wrapped in some tape. But that does not preclude a bunch of exposed mains line points from being visible

Sure looks like electric tape

Sure looks like electric tape


Tape removed

"selective" application of the goop

“selective” application of the goop

All part numbers sanded off

All part numbers sanded off. Diode bridge on the left, controller IC in the middle, optocoupler on the right. Clearance distances- nowhere to be found



Of course you can sodler Aluminum cap across a ceramic. What's wrong with that?

Of course you can solder thruhole Aluminum cap across a ceramic. What’s wrong with that?


Hey' it's still connected!

Hey’ it’s still connected!


SHP lense

SHP lense


The lamp uses SHP brand Heatsink/lens combination

The lamp uses SHP brand Heatsink/lens combination. LEDs appear to be handsoldered to the metal clad board, with very questionable solder joints

And now to the everyone’s favorite part- reversed engineered schematic diagram. What we have here is basically an isolated (if we ignore for a moment the total lack of clearances between various nodes) power supply with voltage and current feedback. The density of parts and their relative location is such that I doubt this will ever pass any safety tests, but it does seem to work. Thinking that this hazard ran for years makes me stop before buying any new no-name lamps!

Reverse engineered schematic

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