I am trying to figure what is with my broken power adapter (230V AC -> 12V + 5V DC at both 2A).
After checking the fuse, now I extracted two heavily cooled diodes, which could be the cause. But I simply can't figure out what diodes that are.
They are standard shaped (black cylinder, one end has the silver mark), 9mm long and 5 mm diameter, the connector wire is 1.1 mm diameter. On it I find two lines:
I have performed some quick measurements, which are confusing me. I found a 3300 ohm resistor and plugged them at 2.7V. The voltage drop at the diode was 0,16V ( 2.7V if reversed) With another 220 ohm resistor it was similar.
Maybe the resistor values I am using are too high (the voltage is too low) to make useful tests...
How can I find out if they are OK or broken, and what type of diode do I have here?