When GPS vanished I tried cleaning the copper mesh in the backcover, didn't help. I used a backcover from a broken phone, this having a metal contact plate instead of the copper mesh. Didn't help. I cleaned the contact plate and GPS reappeared. Then I applied some conducting silver (I took out a droplet of the silver sediment from the tube) to the contact plate and closed the phone immediately, hoping it would kind of "cold solder" the PCB contact to its counterpart in the back cover, making it a permanent fix. We will see how permanent this is.
Funny to mention that when I tested, GPS worked without the backcover (battery held in place with a rubber band), though only with weak signals, but not with the backcover on.
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