Damp-induced circuit board failures (reproduced)

Common fault problems caused by wet circuit board

time: 2016-02-03-19:52:53 EDIT: Electrician column: Circuit

Guide: Wet caused by the common circuit board failure, resulting in circuit board circuit parameters change caused by circuit board failure, circuit board circuit in a short-circuit state, resulting in circuit board failure, signal processing or transmission line circuit, resulting in circuit board failure.

Common fault problems caused by wet circuit board

The definition of moisture contains more water than normal, so in the humid environment of the use of the circuit board, because the air contains relatively large moisture, when the humidity is too large will be turned into a drop of water drops to the circuit board, fell to the board of Water beads on the circuit board after the spread, will be attached to the various pins or printed wiring. From: Home of electrician technology

Since the current electronic components used in the circuit board are SOP or SSOP SMD components, the distance between pin and pin is very small, especially the distance between the pin and pin of the integrated circuit of the SSOP package is very small, when the moisture is converted to droplets on the SSOP package IC pin, If the circuit board is in operation, it will add an invisible resistor between the pin of the IC (because the water is electrically conductive), the very person will cause a short circuit, causing the circuit board in the working state to fail.

If the moisture is converted into the water droplets on the circuit board of the electronic components of the PIN, and the circuit board just in the state of no work or power, will not immediately cause damage to the circuit board, but the electronic components of the PIN or printed line by the infiltration of water droplets, the pin of the component will be corroded, Long time will also be due to rust and broken feet caused by the circuit board fault, printed line by the water droplets infiltration, especially the signal transmission line is relatively small, after a period of infiltration, will appear in the case of the printed line mold, resulting in the circuit board in the work, the situation can not be run.

For the reason that the damp causes the board fault , the outline is three:

1, cause the circuit board in the circuit parameter changes caused the circuit board fault;

2. The circuit board in the circuit is in short-circuit condition, causing the circuit board fault;

3, resulting in circuit board signal processing or transmission line circuit, resulting in circuit board failure. Friends can develop measures based on these three articles to reduce or prevent the appearance of a circuit board failure due to moisture in your equipment.

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Damp-induced circuit board failures (reproduced)