Board repair

[eagle00799]

Can anyone tell me how I can go about fixing this board? I was removing an ic and tore the pad out, I'm not sure where it leads to but I believe its the ground pad? There is a small hole right behind it that may be where I can run a jumper wire or am I totally wrong here?

[R_J]

Re: Board repair

Looks like its just the solder point for the ic's tab, scrape away some of the greeen coating and exppose the copper on either side of where the pad is missing so you can solder it. looks like it is connected to the center pin of the ic. the same pad configuration looks like the one located next to c675 marking.

[budm]

Re: Board repair

The pad also used as the heatsink to transfer the heat from the tab, so you need to make sure the tab has big contact with the copper trace. Yo may have to use thin copper piece to use as the heat sink.

[tw2005]

Re: Board repair

Having that tab soldered to that pad also would be acting as a heatsink for the device. keep that in mind as a possible issue

[eagle00799]

Re: Board repair

Could I possibly solder a piece of braided copper wic under the tab? or does it need to be a thin piece of regular copper?

[anmol]

Re: Board repair

Yes you can,

first you have to remove some green paint from left and right side for joint solder copper wic with it.

BE CARE FULL it is not ground. it is regulator ic like 1117?

Regard

[Dang]

Re: Board repair

Personally I would use some copper sheet, greater surface area resulting in better heat dissipation but copper braid may well suffice, depends on the heat being generated.

[eagle00799]

Re: Board repair

So where can I get some copper sheet? I thought maybe finding some solid copper wire and flattening it with a hammer.

[Dang]

Re: Board repair

That could work but the hammering will likely fatigue the metal, only place I know for copper sheet is either a model shop or, and this is where I got it from, Hobby Craft, it's for scribing, they have it at a thickness comparable to what was originally in place.

[Agent24]

Re: Board repair

You may also be able to get away with putting a tiny heatsink on the IC package directly. You would need to use thermal paste that has epoxy as well to stop it falling off.

[R_J]

Re: Board repair

How much heatsink do you think you will get with a 1/8 in X 1/4 in piece of copper foil that was under the ic originaly? You could always install a water cooled heatsink on it.

[Agent24]

Re: Board repair

Something like this would probably work: http://www.ebay.com/itm/20PCS-Lot-Al...-/251233475838