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Powerbook Duo 280 broken resistor..looking for advice

OleLila

Well-known member
I had acquired a nonworking powerbook duo 280. It would chime, then make a loud, brief static sound through the speakers and go to a grey screen only. I decided to recap and see if that fixed it.  While cleaning, around the negative terminal of C9, I found a broken resistor. As it was out of place and broken, I prepped its tiny pads as well. Remarkably, i do have another nonworking Duo 280 with this resistor still in place. My questions are 1) Does this have to be replaced? If it has to do with the charging of the battery or a non essential function, I would rather do no harm and leave it alone. 2) If it does have to be replaced, what is the best way for an amateur to try it? I have a heat gun but have been hesitant to put that much heat on a board I want to keep. It is really tiny so I doubt I could solder it. I have placed some very small jumper wires in the past onto similar sized pads.

PBDuoResist.jpg

 

Franklinstein

Well-known member
I'm pretty sure that's a capacitor, actually (C16). Don't bridge it or anything or you'll have problems. Tiny capacitors like that usually aren't as touchy as resistors: so long as they're in the general ballpark of the original value you can use any other tiny capacitor of the same size and type (those things are usually ceramics and therefore unpolarized) to replace it. You can try to run without it but it may cause problems; plus replacing it now would be easier than working around the much larger capacitors after they're reinstalled.

 
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