Vboost controller

[Baco 83]

Pulled my vboost controller apart and found some of the coating on the bottom side melted along with what looks like some solider points the melted together. Does anyone have a picture of the bottom side of the circuit board so I can attempt to clean this one up.

 

[one2dmax]

Looks like someone was in there to repair before. They can get micro cracks that cause intermittent operation. Many times simply peeling off the coating and re-melting the solder will re-establish that contact and be good to go again.

 

[Baco 83]

I cut a small amount out to test the connections to the wires. But when I took the board out of the case the bottom hole in the coating looked like the top hole. I am going to try tomorrow to reflow one of the connections. My main concern is the bridging of the solider points in the lower hole

 

[02GF74]

I probably have one somewhere but cannot find it right now.

Mine had a crack in the solder around one of the pins, see below; the pin to the right of the blue circle. Look hard and you can see a faint dark ring that is the fracture - the gap was causing intermittent operation - pressing on the module flexed the board so bridging the gap.

I suggest you take a very close look at all the joints with a magnifying glass.