On 8 feb, 13:50, "Arfa Daily" wrote:
(...)
I hate the stuff with a passion * * :-(

Arfa

I agree. I just repaired the control card of my room air conditioner.
The PCB was marked as ROHS. The failure was that the swing motor wasn
´t working properly. It would work sometimes, and sometimes not, until
it didn´t turned on no matter what. Testing the motor for continuity
revealed that the internal wiring was ok, so the problem was in the
control card. Testing of the relay which turns on/off the motor showed
nothing relevant, prodding the relay showed nothing too and to the
naked eye the relay looked like it was well soldered to the board
without signs of arcing. Nonetheless I decided to remove the relay and
solder it back... and problem solved :-/

I don´t know for sure what happens to lead free solder joints over
time, but seems to me that over time the solder joint becomes some
sort of insulator, even if it seems OK both physically and
mechanically.

FWIW, a swing motor just consumes 4W at 220 VAC. It´s almost equal in
power and size as a turntable motor for a microwave oven.