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Mar 28, 2015, 10:45 PM
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Android GPS flareup

After several uneventful years, Android GPS stopped working again. The problem initially appeared to be a failure of the app to stay on when the phone was blank. Then it was narrowed down to the GPS module shutting down when the phone was blank. It was further narrowed down to not involving the SDK, IDE, or any settings.

It was further narrowed down to the module not shutting down but entering a mode where it continued reporting locations, but much less accurately when the screen was blank. Each location was very close to the final real location, but slightly moved towards the current location.

The issue 1st appeared after running 13 miles with it. After leaving a Target store, it stopped recording the current position when the screen went blank. The issue now appears like 1 of those cases of putting your thumb on a trace to make a circuit work. In this case, the proverbial thumb would be the screen being on.

The timing of it all agrees with yet another salt water intrusion. These phones are now $30, so there wasn't much concern for protecting it. They're cheaper than buying a standalone GPS module. GPS recording still works with the old battery sucking, unreliable bluetooth hack:

There's another matching phone at the day job that no-one uses, but success varies when changing phones with the same plan.

The innards continue on their way down to a single chip on board.

A contact covered in goo being used to enhance connectivity, but no salt. Wiped the goo off, which did nothing. There were many pads for missing components, near all the antennas.

The other side was a bare sheet of nothing.
Last edited by Jack Crossfire; Mar 29, 2015 at 12:00 AM.
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