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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Missing solder pad and resistor R6700, headphones are not recognized

I am trying to repair my MacBook which for over a year has not been able to recognize my headphones. I checked all the resistors filters and found R6700 missing. It might have fell off for whatever reason. I tried to reattach r6700 from a donor board but ended up making things much worse by losing one of the solder pads after I ran flux and solder over it. It just peeled off after I ran fresh solder on it. This was at a temperature of about 170 C (might be too low?).

Is there any way to fix the trace?

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The highlighted pad is missing. Could I run a jumper from the highlighted pin to R6700?

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On the left of pin 1 of R6700 you have about 1 cm rail connecting the pad to the rest of circuit. Clean the area, use a good light source and some magnification and you’ll see the rail quite clearly. Scratch a bit its surface until you see the copper. Maybe there’s no need for a jumper either, unless you pulled the rail together with the pad, solder by itself should be enough to do the job properly. Temperature is way to low even for a solder iron, it should be in the range 290/320 if you use leaded tin , some more for lead free. That depends much on size of iron, station precision and so on..but 170C isn’t enough even to melt the solder wire.

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Justin Ash will be eternally grateful.
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