The two USB fuses are marked differently so perhaps from different suppliers. Might be worth taking a multimeter to them with the board un-poweredand everything unplugged and measure what their respective resistances are.marcoalexcampos wrote:What tricked me to look close to the boards was the fact that one of the boards has significant stability problems with the USB (LAN/Keyboard/Mouse).
JPG Updated with RAM info.marcoalexcampos wrote:@therealeasterbunny: Do you think you can get a more clear photo, or at least identify the chips (mainly the RAM) that differ from my boards?
Okey dokey, JPG updated with 'Board Cmarcoalexcampos wrote: At least one of the PCBs is different from the two I have, so we're looking at 3 or 4 (slightly) different boards.
Let's call your board on the left "C", just for reference.
I'm not the expert but other threads have noted voltage drops when the fuse resistances are higher, drops enough to cause some ( but not all ) USB devices to become problematic. That the one with the higher resistances has problems suggests this could be more of the same.marcoalexcampos wrote:@hippy: What do you make out of the values I've measured? Thank you.
Board A: F1: 3.8ohm, F2: 4.5ohm (<- Ok)
Board B: F1: 8.2ohm, F2: 5.9ohm (<- with random problems on USB/LAN)
You need to add build week ranges on these and change your A,B,C nomenclature to match that.marcoalexcampos wrote:I've created a section on elinux's wiki with these infos and photos:
http://elinux.org/R-Pi_Troubleshooting# ... Frevisions
Please feel free to make suggestions or add info.
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