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Usually circuit boards were mass soldered with a 'wave table'. Board would be held above the pool and a 'wave' would wash the bottom of it in solder, fusing all the points at once.
It's actually quite common for any old solder joint to eventually crack due to vibrations and road use. Older BMWs suffer from this as well, either from the DME, the gauge cluster, the Info Panel, even the warning panel in my friends 88 RX7 had these issues (his clock worked half the time due to this issue). I took aviation classes in college and learned the art of repairing electrical circuits and 90% of the time all these Gremlins were fixed by a simple reflow..
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1985 944 / 2007 335i / 1987 325is / 1985 535i / 1999 528iT / 2006 X5
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