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by netlinker
Mon Sep 30, 2019 11:22 pm
Forum: Advanced users
Topic: Spare BMC2837
Replies: 23
Views: 1436

Re: Spare BMC2837

Ok, I finally found the time to make a short Video and a picture showing the repair. I will edit and upload the next days. Both raspberries came back to life, but I confirmed the HDMI output to be dead. Does anybody of the guys at Pi Towers know what it takes to ruin the output driver voltage/curren...
by netlinker
Fri Aug 30, 2019 12:22 pm
Forum: Advanced users
Topic: Spare BMC2837
Replies: 23
Views: 1436

Re: Spare BMC2837

Ok everyone, I managed to bring one of my broken boards back to life. Here is what I did: 1. Measure shorts on the powerrails -> found short on 3.3V (1 Ohms) 2. Locate short -> use a high resolution ohmmeter and measure the resistance of the short at all 3.3V points accessible. 3. The point with the...
by netlinker
Wed Aug 28, 2019 8:26 am
Forum: Advanced users
Topic: Spare BMC2837
Replies: 23
Views: 1436

Re: Spare BMC2837

You can still buy and use single pole in the UK. Just look on Screwfix. Even for new builds. Anyway Are you sure it the SoC and not the power circuit? I'm interested how you know (to learn) I don't doubt it is easy for you to do, you say you have the skills :-) I don't know why others do. Put a req...
by netlinker
Wed Aug 28, 2019 8:14 am
Forum: Advanced users
Topic: Spare BMC2837
Replies: 23
Views: 1436

Re: Spare BMC2837

I'm still investigating the cause for the damage tough. Does anybody know if the HDMI output is protected by some kind of TVS circuit, and if so, what the absolute maximum ratings are? No additional TVS. The SoC does have ESD protection on those pins but don't know the ratings. Your 3B has some com...
by netlinker
Tue Aug 27, 2019 7:50 am
Forum: Advanced users
Topic: Spare BMC2837
Replies: 23
Views: 1436

Re: Spare BMC2837

Yes indeed, I meant "neutral". Its a pluggable switch like that kind you can plug inbetween the outlet and your device. In the UK you can't reverse the Plug (at least the three pole version), because its coded, in Germany you can. Therefore you won't know if it is switching neutral or phase. I bough...
by netlinker
Mon Aug 26, 2019 9:23 am
Forum: Advanced users
Topic: Spare BMC2837
Replies: 23
Views: 1436

Spare BMC2837

Hi everyone, just recently I destroyed two of my beloved RPI 3B. It seems, Overvoltage, comming from the HDMI out, destroyed the processors. Sadly I only got suspicious after the second one died within a week. I have a one pole switch installed prior to my Monitor to fully switch it of, when I don't...
by netlinker
Wed May 15, 2019 1:21 pm
Forum: Troubleshooting
Topic: RPi3 Bluetooth and Wifi don't play well together
Replies: 55
Views: 21304

Re: RPi3 Bluetooth and Wifi don't play well together

I also got a problem using bluetooth with two devices simultaneusly. I connected a Headset with a2dp and a Apple magic keyboard. The Headset alone worked fine, and also the keyboard would. Altough both of them had problems connecting in the first place (gui alone wouldn't work, had to use bluetoothc...
by netlinker
Wed May 08, 2019 9:48 am
Forum: Troubleshooting
Topic: Getting OOM altough there is still free memory
Replies: 0
Views: 110

Getting OOM altough there is still free memory

Hi, I'm working with my PI on a daily basis and I'm experiencing frequent OOM situations. I can deal with them via SYSRQ-F. Still it would be better to use the RAM to it's full extent. The OOM situations usually occurs at about 300 - 250 MB free. My memory split is 128 MB GPU. The system gets OOM us...
by netlinker
Fri May 18, 2018 10:34 am
Forum: Camera board
Topic: Graphical interface for raspistill
Replies: 18
Views: 25765

Re: Graphical interface for raspistill

There has been a change in WxPython. Therefore the Code has to be changed. You have to open the Python file in the editor of your choice and modify line 12 to: from wx.lib.pubsub import pub as Publisher and you have to change each occurrence of Publisher(). to Publisher. . This works for me kind of....

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