Usb power issues: how fix it?

[GianfrancoPa]

I read in Internet (http://himeshp.blogspot.se/2012/07/rasp ... imate.html) that to fix usb power problems, it is necessary to use two 1ohm resistors on F1 and F2 fuses.

Today I read on Raspberry main site (http://www.raspberrypi.org/archives/1929) that the revision n2 of Raspberry will fix the problem "replacing the fuses with links". So, is not necessary the use of resistors??

Thanks at all!!

[RaTTuS]

if you have rev 2 of the board then you dont need to do anything
if you don't have rev 2 then it will work fine as long as you use a good powered usb hub or you bridge the 2 fuses [0ohm]

[jamesh]

And also use the most up to date distro, which has fixes for USB issues. This fixing is still ongoing, so keep things updated and things will only get better!

[pluggy]

I just short circuited my USB polyfuses with copper wire from some old cat 5 cable.



The 1 ohm resistors are to reduce possible surges through the main polyfuse if you're powering through the Micro USB connector (which I don't) when plugging in heavy current USB devices.

[redhawk]

snap

Just be careful not to solder anything else to the board and you should be alright.

Richard S.

[pluggy]

Your soldering is neater than mine, my excuse is the peepers aren't what they used to be.....

[GianfrancoPa]

So, if I've used the two resistors, It's ok?

[pluggy]

Assuming it works, yes. Later boards have 0 ohm resistors instead of polyfuses and the latest boards have had them removed altogether. The short circuit method is now "legitimate" but 1 ohm resistors across there won't hurt.