Did I ruin this PCB???

Started by Its been said, November 29, 2009, 08:30:01 PM

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Its been said

The picture is of a general guitar gadgets PR-80 PCB. I was talking to my mom and accidently put the 16 pin socket on the wrong side of the PCB. In an effort to remove it I seemed to have striped off the white cirlceles on either side of the hole (not sure if thats important). Solder no longer seems to want to stick in that area. My new plan of action is to attack a wire to each leg of the chip and solder the wire into the corresponding hole. For the tricky holes I plan to stuff it so full of doubled up copper wire it cant but help make contact.

sooooooooo long story short. Will that work? is there an easier way? should I not even attempt it b/c its hopeless at this point?

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http://www.flickr.com/photos/45102966@N07/4145830392/
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http://www.flickr.com/photos/45102966@N07/4145821618/

Taylor

It looks to me like you lifted the copper pad to which the pin is soldered. That is important; it's the only part that solder will stick to. Solder is meant to not stick to the green stuff, which is called solder mask because it masks the board off from wayward solder.

You need to attach that pin whereever it goes, because it won't work without any metal there. Check the schematic and see what that pin goes to, then run a wire from the pin to that point.

In this case, pin 16 needs to attach to the .47uf capacitor right above it. You could run a clipped resistor lead between the pin and the cap easily.

I think the real lesson for all the kids is to never listen to your parents.

jkokura

A second lesson would be to learn to use removal braid while you're learning to solder. Using a braid to remove a part like that will help you from leaving major damage behind.

I'm getting to be a pro at using braid, probably better than I can actually solder really.

Its been said

Thanks for the idea of just going straight to the source of where its supposed to be. Are there any "schematic for dummies" tutorial anywhere on the web I could check out?

Ice-9

It's not the end of the world as not too much damage seems to be done. The best solution would be to solder the chip socket in the correct way and then solder a wire from the socket pin that has the damaged pad to it the component that the trace connects to.
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Ronsonic


Single sided board. Piece of cake.

First clean up. Use wick to pull all the left over solder. A Q-Tip and acetone or alcohol to remove the old flux. Ever see surgeons on TV with the sponges and suction and cloth and nurses, the cleaner the surgical field the better work you can do.

Insert the socket. Solder to your good pads.

The torn pads, make sure the stray bits don't run into the next pad, like pin 14 seems to be. Use an Xacto to shove it over and solder. You don't need to rebuild those. Just bend the protruding lead from the socket over to where it goes, scrape the coating off and solder it down. This is low current, low stress stuff.

The board has a coating on it that resists solder where it isn't supposed to be. You'll need to remove this from the traces near the missing/damaged pads. Use a small, sharp, straight screwdriver blade. Push toward the broken end to avoid lifting the trace. Just scrape off the coating and leave about 3/16" of shiny trace to solder to. Tin it with a thin layer of solder. Remember that braid you used to clean up. Use the iron and a bit of used braid on the trace and it'll leave just a light coat of solder.

Take a cut-off resistor lead, bend a 90 degree L at the end, just long enough to go into the hole with the pin of the socket. Tin this. It's easiest to have the iron mounted hold the lead with pliers in one hand and the solder in the other. Get just the lightest coat of solder on it. Tap it while hot to remove excess. Yes, wear eye protection. Put the hooked end into the hole with the lead pointing the rest toward the trace it goes to. Just a quick tack of solder onto the lead. Just on, touch solder and off. bend the remaining lead to meet up with your trace. Solder it down. Trim excess length of lead. Maybe retouch solder at pin end. Clean up. Done.
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arawn

Ronsonic has the way of it , your board is not as total loss yet. Work carefully and get some desoldering braid, Its our best friend at work replacing components on mainboards of cable boxes.
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