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Water Damage Recovery

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What to do when the beacon gets wet: the immediate steps, the drying procedure, and the corrosion cleanup that decides its future.

Water Damage Recovery

Water happens: a stream crossing, a rainstorm, a dropped beacon in snow. The first hour decides whether the beacon survives, and the first minutes decide the first hour.

The immediate steps

  1. Power off immediately: remove the cell or disconnect power. Corrosion starts the moment current flows through wet traces.
  2. Remove the cell and open the case.
  3. Dry the visible water with a cloth; do not wipe electronics aggressively.
  4. Do NOT power on to “test if it works” for at least 48 hours. Testing early is how a wet board dies.

The drying procedure

MethodUseRating
Air dry, warm roomThe standard: 48 - 72 hours, board propped upSafe
Rice (uncooked)Absorbs moisture; messy, mediocreOK
Silica gel packetsThe professional version of riceGood
Low oven (50 C)Fast but risky; plastic meltsOnly if desperate
Isopropyl alcohol rinseRemoves residue AND displaces waterFor contaminated boards

The alcohol rinse

If the water was dirty (snow melt, stream, mud), rinse the board in 99% isopropyl alcohol after drying: the alcohol displaces remaining water and dissolves the conductive residue. Then dry again. This is the single best trick for a wet board.

Corrosion cleanup

After drying, inspect under magnification. White or green crystals on traces mean corrosion:

  1. Neutralize with isopropyl or a soft brush.
  2. If a trace is eaten, bridge it with a wire (see Soldering Basics).
  3. Check connectors: the antenna SMA and the audio jack are the classic corrosion sites.

The judgment call

A board that dried, cleaned and passed the bench tests (First Power On Protocol) is trustworthy. A board that shows corrosion on the radio section should be retired: the SX1262’s RF path is unforgiving of residue. The cell, if it got wet, goes to recycling, not back in the beacon.