Look at this board, guys.

小豆子来了

Look at this board, guys. [Copy link]

 

1. How to fix the electrolytic capacitor with glue

2. Why does the circuit board look dirty?

chunyang

For electrolytic capacitors with pins, because the capacitor itself is heavy, it is easy to swing when the board vibrates violently, which may cause the pins to desolder. Fixing with glue will not prevent this. The stains on the pads are the residue of flux, which has no adverse effects except for aesthetics.

btty038

Normally, they need to be fixed with glue. If there is no glue, it means that the product is very random, just for R&D testing.

小豆子来了

chunyang posted on 2020-12-14 11:48 For electrolytic capacitors with pins, because the capacitor itself is heavy, it is easy to swing when the board vibrates violently, which may cause the pins to desolder. Use glue...

OK. I see. I thought it was water stains. And isn't this a SMD electrolytic capacitor?

小豆子来了

btty038 Published on 2020-12-14 13:08 Normally, they all need to be fixed with glue. If there is no glue, it means that the product is very random, just R&D testing, um,

Aren't chip electrolytic capacitors welded without gaps?

qwqwqw2088

The circuit board should be cleaned after welding

Electrolytic capacitors are usually fixed with 704 glue for shockproof

小豆子来了

qwqwqw2088 posted on 2020-12-14 14:04 After the circuit board is welded, it should be cleaned. The electrolytic capacitor is generally fixed with 704 glue for shockproof

Well, I bought a one-button starter, looked at the motherboard, and returned it. I think a regular company should clean the soldering. There are many typos on the host shell, and there are no typos in the manual. I think I'll just give up.

小豆子来了

chunyang posted on 2020-12-14 11:48 For electrolytic capacitors with pins, because the capacitor itself is heavy, it is easy to swing when the board vibrates violently, which may cause the pins to desolder. Use glue...

Well, strictly speaking, flux residue will also affect stability in industrial design.

chunyang

Xiaodouzi is here and posted on 2020-12-14 14:40 Well, strictly speaking, flux residue will also affect stability in industrial design,

There are many types of flux, as long as it is not a specially applied acidic flux, it is fine. The flux residue in the original poster's photo is obviously not the case. The solder paste used for soldering surface mount components contains flux, which does not need to be removed after soldering.

chunyang

Xiaodouzi is here and posted on 2020-12-14 13:43 OK. I see. I thought it was water stains. And isn't this a SMD electrolytic capacitor?

As long as the size and weight are increased, applications with strong vibrations need to be fixed with glue. However, surface mount electrolytics are generally not too large, and only when the pad size is relatively small do they need to be fixed with glue to avoid pulling off the pad.

btty038

Xiaodouzi is here and posted on 2020-12-14 13:49 SMD electrolytic capacitors are not welded seamlessly

The electrolytic capacitor in your picture has a certain height. It needs to be fixed for shock environment test and vibration test, such as process requirements and inspection requirements.

qwqwqw2088

qwqwqw2088 posted on 2020-12-14 14:04 After the circuit board is welded, it should be cleaned. The electrolytic capacitor is generally fixed with 704 glue for shockproof

Generally, the places where manual plug-in is soldered need to be cleaned, and the solder slag residue will affect the performance of the board.

FantasyTG

If the board is not cleaned properly, it will affect the resistance value.
I don’t know if it is the flux or the tin oil.