Dear Technicians,
I have a bad experience in soldering:
Two months ago, I soldered the point of PJ801 (in the photo) on a laptop mainboard using flux and leaded solder. Then, I cleaned the area using pure paint thinner. I did not used any other substance. but there was still some flux residues which I refused to clean. I did this because I did not want to use too much thinner.
Today, the customer came back. I opened the laptop and observed one side of the capacitors in the area got a dark color. Even the solder of PJ801 became dark. This is what happens to capacitors when they get liquid damaged. but the other pins of the components look shinny.
In the photo, I noticed that the flux residues are gray-colored too. Probably, the thinner made brown flux turn gray.
Now my questions are:
Why have this liquid-damage happened?
What did I do wrong in that soldering?
Was the liquid-damage due to flux residues or something else?
note: I do not use my isopropyl alcohol because I used it sometimes but it had the following problems:
1- It could not clean the flux completely.
2- It could not clean glue from the board.
3- It leaded to liquid damage too. It may be mixed with water by the maker.
Then, I decided to use paint thinner which is stronger and can clean flux and glue completely.
thanks
I have a bad experience in soldering:
Two months ago, I soldered the point of PJ801 (in the photo) on a laptop mainboard using flux and leaded solder. Then, I cleaned the area using pure paint thinner. I did not used any other substance. but there was still some flux residues which I refused to clean. I did this because I did not want to use too much thinner.
Today, the customer came back. I opened the laptop and observed one side of the capacitors in the area got a dark color. Even the solder of PJ801 became dark. This is what happens to capacitors when they get liquid damaged. but the other pins of the components look shinny.
In the photo, I noticed that the flux residues are gray-colored too. Probably, the thinner made brown flux turn gray.
Now my questions are:
Why have this liquid-damage happened?
What did I do wrong in that soldering?
Was the liquid-damage due to flux residues or something else?
note: I do not use my isopropyl alcohol because I used it sometimes but it had the following problems:
1- It could not clean the flux completely.
2- It could not clean glue from the board.
3- It leaded to liquid damage too. It may be mixed with water by the maker.
Then, I decided to use paint thinner which is stronger and can clean flux and glue completely.
thanks
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