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Question:

Excuse me: why does the chip capacitor touch the soldering flux and it doesn't work?

Hello I was doing the main board, recently encountered a problem: is always negative capacitance is high, then do a test, is a drop in capacitor flux, after soldering out capacitor on the bad, but did not drop the flux too out right. Excuse me, what's the reason for this? Thank you

Answer:

The flux usually contains halides and halide is conductive, after welding, must take the flux residues cleaning clean, otherwise, will be the equivalent of a resistance capacitance, can not play the role of capacitance......You can do an experiment to try again, measure the resistance capacitance in bad welding, then put the capacitor cleaned, dried and then test to see if there are capacitors, resistors, capacitors or measurement and calibration values are consistent......Finally, in the welding circuit board, as long as related to the flux, must be clean, do not leave a residue, otherwise, not only affects the circuit traces white beautiful, ugly, but also affect the circuit electrical insulation properties......
Are you sure the capacitor is broken? I don't have much experience in this area. But if the flux is too high or the pad is oxidized high and the melting time is insufficient, the problem will be obvious
There's something wrong with the soldering.

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