Water got into the computer motherboard when it was working. Why is the computer still working and not turned off?

1, the surface of most parts of the computer motherboard has an insulating layer, and the water will flow to the bottom, and it will soon flow to the PCB below when it meets water, so the surface of the high part will not be short-circuited for the time being;

2. The PCB on the computer motherboard is in a low position, which is the main carrier of moisture. PCB is mainly made of glass fiber, and there is a screen printing layer on the surface of PCB, and there is a solder mask in the non-pad area, which has good waterproof effect.

3. The positions that are prone to short circuit on 3.PCB are pads and metal pins. The newly produced computer motherboard has a thin layer of flux on the surface of solder joints and pins, and the computer motherboard with a long time has a thin layer of oxide on the surface of solder joints and pins. These are non-hydrophilic substances, which will not wet when they meet water for a short time, and the electrolyte in water will not play a conductive role for the time being.

To sum up, it is not necessarily a problem that the computer motherboard accidentally touches water for a short time.

But if the time is long, the flux, oxide layer or grease layer will soon lose its protective effect. Once the water molecules directly contact the solder joints or pins, the electrolyte, oxygen ions and hydrogen ions in the water will play the role of wires. When it meets two or more pins with potential difference, it will cause a short circuit and lead to the burning of electronic parts.

Therefore, the computer motherboard should be turned off in time when it encounters water, and the water stains should be cleaned and dried with a hot air gun. Don't think that there will be no problems for the time being.