B24Fox wrote on 2021-04-28, 12:20:
weedeewee wrote on 2021-04-28, 10:39:
It's just a decoupling cap with direct connection to ground and the voltage regulator right next to broadcom chip.
You mean "Conexant"chip, right?
yes, conexant, broadcom, meh. They're the same these days.
Yes, sadly, in-circuit capacitance measurements, are vary rarely accurate 🙁..
So the cap is a decoupling CAP, for the input of the voltage regulator? or for the output(like in between the regulator and the chip)?
probably the output, though more likely, just there for the chip itself, since it's right next to the chip.
Were/are you able to identify another CAP anywhere else on the board, that looks identical to the one that is broken on mine???
I got no idea were there might be a similar one. And since it's a tiny decoupling cap, right next to a chip you'll likely not be using, I wouldn't give it too much thought.
My board is also from a Packard Bell. And has black connectors at the back, not colored, AMI bios (not AWARD), and has JFP jumper array missing from factory.. (but i doubt that makes any difference).
Thank you for the very good info regarding the USBs and pins and such! I would have for sure presumed that there's a broken USB connector : ))
According to the manual, J16 decides between two back ports or one back and one front.
Anyway, yesterday I finished transplanted everything else that was broken off, and the board POSTs fine. (Don't have an OS installed tho.. But i hope to finish all testing by the end of the week.)
But I would really like to also repair/restore it to 100%, especially as I have this donor board, and things could be very easy if i just manage to identify the right component.
Well, I had to change the cpu voltage capacitors on mine. Symptoms were no boot and, bootup for a while and then shutoff. So if your board has been heavily used before, and you haven't changed those, then you'll run into those problems sooner or later.
And for the missing capacitor... according to the datasheet of the Bt869, it's either a 0.1µF ceramic, or a 47µF ceramic. It's even listed what part number to use. Table 3-1
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