I had to repair my 45 plus year old Sharp kitchen microwave oven just last week. A relay's coil terminal, solder joint on the PCB was completely cracked all the way around the pin. Re-soldered it and works just like new. I chalked it up to the constant vibration of the door being shut.   Ira.

On 5/2/2020 3:24 PM, '[email protected]' via neonixie-l wrote:
It was meant as a joke.  I still use SnPb eutectic solder, and I think my ~1 kg is a lifetime supply  I think I can blame this for my dumbness, since I used to hold the solder in my teeth during construction and repair.

I have this religious belief, scientifically not proven, that Pb-free solder made some of the surface-mount boards in my car less reliable.  There were some medium-power current-limiting resistors where one of the solder joints eventually cracked ad left an open circuit.  I blame this on the ROHS solder being more brittle and the thermal cycling eventually fatiguing and cracking the solder after 5-10 years.

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