Circuit board cleaning and maintenance methods are as follows:
Pre-cleaning preparation before cleaning the circuit board, including jumpers, card boards, batteries, and ICs and other connectors must be carefully unplugged one by one, potentiometer, transformers, and solenoids coils (inductance coil) must be unloaded from the board, so that the components, such as once in the water, the gap or between the turns of the water is difficult to be swept out by compressed air and moisture is difficult to be dried, in order to ensure that the restoration of the finished cleaning error. Therefore, once water enters the components, the water droplets in the crevices or between the turns are difficult to be blown out by the compressed air and the water is difficult to be dried, so it is necessary to make a record of the dismantling one by one to ensure that there is no error in the restoration after cleaning.
At the same time, by the way to check the circuit board on the electrolytic capacitors whether there is liquid leakage or the top of the bulging phenomenon, it should be removed, and make a good record, so as to clean up the circuit board after the replacement of the equivalent value of the new product. For computer power supply circuit boards, you should also check the printed circuit of the pads and components between the feet of whether there are cracks live desoldering, especially focusing on checking the high-power components, such as cracks live desoldering should be immediately replenish the welding, found a replenishment of a welding, otherwise it is easy to miss.
Cleaning:
1) clean before the first at the same time with a clean soft paintbrush (1-inch wide brush is better to use) and the pressure of about 0.1Mpa [that is, 1kg / per square centimeter] dry compressed air to remove the accumulated dust on the circuit board.
2) cleaning can be used to wash the circuit board special cleaning fluid (commonly known as washboard water), this liquid can be to a specialized store to buy. If there is no washboard water, can be operated as follows: (Now we generally do not use the washboard water) first rinse with tap water, pay attention to the water flow to be soft, can not be too strong, the side of the rushing side of the soft brush carefully brushed gently, the circuit boards on both sides of such as.
3) Then use a soft brush dipped in neutral soap to carefully and gently clean every part of the circuit board, especially the jumper plug, slot (CPU slot, AGP slot, PCI slot, memory slot) on the inside and the bottom of the IC socket, the bottom of the North and South Bridge chips, BIOS chips and every other IC chip underneath the bottom of the capacitors and other places should be more carefully cleaned, the operation should be Attention should be paid not to upright installation of small capacitors and other components touch crooked; if you find the wash out of the soap foam is very dirty, it must be rinsed with water, and then use soap in the scrubbing again, until the wash out of the soap foam for the white so far.