Raspberry Pi Forums

Hello all, i will try to explain everything i did with the material i have to see if anyone came across an issue like this or if some one could kindly try figuring what is happening.

After some time looking at the raspberry pi i finally ordered one + case + sd card 4GB's (all from RS Components) witch got into my hands yesterday (finally!), so since i had everything to start one Keyboard with Mouse incorporated (one of those media keyboards), my Samsung Galaxy Nexus Charger (i checked here for compatibility) and and HDMI cable (from my PS3), i started the OS installation ... downloaded the Raspbian from the Download section of the official site used WIn32ImageWriter to to the "Instalation".

Next step i plugged everything to the TV and connected it to the power charger of my nexus phone. The pi started no issues so i processed to the configuration with the rasp-config utility. I tried to slightly over clocked it to 800Hmz was working ok but after a while i decided that for the goal that i was trying to accomplish (setup and webserver) this wasn't needed so i reverted the OC to stock clock. Installed the web server apache, and configured the NIC to have an IP Address disconnected everything (shutdown first with linux command, removed HDMI, Ethernet so on ..) placed it in my main switch at home and connected plugged the power and from my smartphone i could access the webserver so i went to sleep ....

This morning raspberry pi was "dead" the power LED was the only one ON and the switch didn't had any activity on the port i had the device connected, so i pulled the plug and connected it again as expected everything went back to normal, so i let it on with SSH port forwarded in the router so i could configure it from work in my lunch hour. a couple of hours later I tried to access it again but the Pi is now in the "dead" state again ....

Does anyone have any idea what is happening or how can i try to figure what is happening? any help/tip that could help me would be deeply appreciated. thanks in advance.

2 things to try, 1 - completely headless, SD card, PSU and ethernet only -you're obviously capable of achieving this, and 2 - what is the voltage across TP1 and TP2 ?

Yes, as was mentioned, check the voltage across TP1 and TP2 under load. Power supply problems are the biggest issue by far. The polyfuse on the input has an internal resistance so the working voltage on the circuit side goes down as the current draw goes up. Anything less than 4.75 volts is not guaranteed to work. There may also be a surge in current draw during startup so I would say a steady state voltage less than 4.9 is probably marginal. I ended up bypassing the polyfuse with a glass fuse to get around this problem.

Hello, unfortunately i m unable to do this test because i do not own the proper equipment to do an measure the electrical current in the device, but i will try an different adapter or even an Powered USB HUB that i own ...

Mobius wrote:Yes, as was mentioned, check the voltage across TP1 and TP2 under load. Power supply problems are the biggest issue by far. The polyfuse on the input has an internal resistance so the working voltage on the circuit side goes down as the current draw goes up. Anything less than 4.75 volts is not guaranteed to work. There may also be a surge in current draw during startup so I would say a steady state voltage less than 4.9 is probably marginal. I ended up bypassing the polyfuse with a glass fuse to get around this problem.

Oh i see i wasnt aware of the power issues since i my project my own web server to develop php applications (yeah i m more of a programmer than anything else..), tyvm for both of you i will try see what i can manage with different adapters and see if theres anything diferent happening...