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by vitor
Wed Jun 24, 2015 4:59 am
Forum: Troubleshooting
Topic: B+: "usb 1-1-port2: over-current change"
Replies: 8
Views: 17322

Re: B+: "usb 1-1-port2: over-current change"

AvJoe wrote:Anyone solved this? Getting the same messages with a Raspberry 2 model B here.
I managed to fix it.

viewtopic.php?f=28&t=110164
by vitor
Fri Jun 19, 2015 5:19 am
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

Re: [Solved] USB not working - Raspberry pi 2

Just a small update. Now my Pi is fully fixed. USB ports are working just like when I received it. Got the AP2553 for $4 shipped from digikey. So, after replacing both C97 (which shorted and damaged U13) and U13 for working ones my pi's usb ports are working again without and usb powered hub or Y ca...
by vitor
Sat May 23, 2015 12:59 pm
Forum: Troubleshooting
Topic: Raspberry can't read usb mouse and the cpu is really hot
Replies: 14
Views: 1383

Re: Raspberry can't read usb mouse and the cpu is really hot

Yeah. It's probably broken. I was still having ethernet and cpu wasn't too hot.
by vitor
Sat May 23, 2015 3:31 am
Forum: Troubleshooting
Topic: Raspberry can't read usb mouse and the cpu is really hot
Replies: 14
Views: 1383

Re: Raspberry can't read usb mouse and the cpu is really hot

How hot is your cpu? Try 'vcgencmd measure_temp'. I had issues on my pi 2 usb ports but could partially fix it. It was a damaged capacitor. PP27 (5v) was being shorted to GND and damaged AP2553 chip. Now I need to use a powered hub (or Y cable) or bypass ap2553 in order to use usb ports. https://www...
by vitor
Wed May 20, 2015 6:35 pm
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

Re: USB not working - Raspberry pi 2

Just a small update. C97 is out of the board. The guy who helped me removed it, placed it again to see that the short between PP27 and GND is over, then removed again until I get AP2553 replacement. Since Burngate told I could bypass it, I tried to use a powered hub (actually, I don't have one, but ...
by vitor
Wed May 20, 2015 6:09 pm
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

Re: USB not working - Raspberry pi 2

I don't know a better place to get an ap2553, but (being something of a cowboy) if it were mine, I'd just remove it and wire the 5v straight to the output. Having converted your nice modern Pi 2B into an antiquated B v.2, you would lose the protection afforded by that chip, but plenty of us thought...
by vitor
Wed May 20, 2015 2:21 pm
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

Re: USB not working - Raspberry pi 2

Since I don't know much about electrical, I took it to a guy who understands it a lot more than I do. I showed him the USB schematics and he founds out that C97 was damaged. He replaced it then PP27 (USB 5V) isn't being shorted to GND anymore. He told me if I could find a replacement to ap2553 he co...
by vitor
Tue May 19, 2015 3:35 pm
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

Re: USB not working - Raspberry pi 2

There's a partial diagram in https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=88789 which may help. Between the main 5v rail and the USB is a AP2553 chip that's reporting a fault to the hub chip, as well as preventing the short-circuit from pulling the main 5v down. It's possible that the US...
by vitor
Mon May 18, 2015 2:47 pm
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

Re: USB not working - Raspberry pi 2

I know almost nothing about electrical things, but I was trying to understand why my rpi2 was having this usb-port over current issue. So, I got a multimeter and found out that 5V USB (PP27) is being shorted to GND. Tested both PP3 and GPIO pin 06. I did this test using 200Ω as scale in multimeter w...
by vitor
Sat May 16, 2015 2:43 pm
Forum: Troubleshooting
Topic: Request for memtester results [Raspberry Pi 2]
Replies: 7
Views: 2309

Re: Request for memtester results [Raspberry Pi 2]

I think mine went ok [email protected] ~ $ memtester 256M 1 memtester version 4.2.2 (32-bit) Copyright (C) 2010 Charles Cazabon. Licensed under the GNU General Public License version 2 (only). pagesize is 4096 pagesizemask is 0xfffff000 want 256MB (268435456 bytes) got 256MB (268435456 bytes), trying m...
by vitor
Tue May 12, 2015 1:59 am
Forum: Troubleshooting
Topic: Remote Access Trouble
Replies: 3
Views: 425

Re: Remote Access Trouble

Maybe you want to use vnc instead of ssh.
http://elinux.org/RPi_VNC_Server

Sorry, it was already suggested by Trevor.
by vitor
Mon May 11, 2015 10:01 pm
Forum: Troubleshooting
Topic: B+: "usb 1-1-port2: over-current change"
Replies: 8
Views: 17322

Re: B+: "usb 1-1-port2: over-current change"

I also got the same issue. And I'm also experiencing low voltage on PP27 (0.5 to 0.15V). Was it supposed to be 5V?

I'm having this issue on rpi 2 model B.

@kkeppler , did you solve it? Is our board damaged?
by vitor
Mon May 11, 2015 9:35 pm
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

Re: USB not working - Raspberry pi 2

I only have 5v/2A power supplies from smartphones, so I'm not sure if I'm able to allow 1200mA max power. Also, I don't know how to do this. Should I try it? I just writed raspbian to another sdcard as you suggested but it didn't fix anything. USB not working, "usb 1-1-port2: over-current change" d...
by vitor
Mon May 11, 2015 9:05 pm
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

Re: USB not working - Raspberry pi 2

I only have 5v/2A power supplies from smartphones, so I'm not sure if I'm able to allow 1200mA max power. Also, I don't know how to do this. Should I try it? I just writed raspbian to another sdcard as you suggested but it didn't fix anything. USB not working, "usb 1-1-port2: over-current change" dm...
by vitor
Mon May 11, 2015 8:18 pm
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

Re: USB not working - Raspberry pi 2

Thank you for your answer. Actually I managed to fix the red flashing issue by changing to a 3rd cable. (28awg). I got some help on IRC channel. The Ethernet port is working fine, so even if pwr led is flashing I can ssh to it. Even now that pwr led isn't flashing but turned red all the time, I stil...
by vitor
Mon May 11, 2015 3:10 pm
Forum: Troubleshooting
Topic: [Solved] USB not working - Raspberry pi 2
Replies: 30
Views: 35386

[Solved] USB not working - Raspberry pi 2

Hi, I purchased a rpi2 last month and used it only a couple times with the same setup everytime (same sdcard, same psu, same usb adapters plugged - wifi dongle and logitech wireless keyboard+mouse which always worked on both rpi 1 B and rpi 2 B until now. A week ago I turned it on and somehow it isn...

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