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coderMe
coderMe
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I've tried 5 different chargers, and none of them gets TP1>TP2 over 4.6 volts. I just plugged in a new charger (found here) which gives it 4.4 volts with only SD card attached, but 4.8 with SD card removed.

I tested the power at the outside ofbefore the polyfuse without SD card inserted: 4 4.94 volts 
Other sideVoltage after polyfuse: 4.86 volts So

So far, so good. Power off Pi, insert SD card, power up Pi and test again: 4.78 volts outsidebefore polyfuse, 4.39 volts insideafter polyfuse.

I tested the resistance of the F3 polyfuse, it seems to be a constant 1.2 Ohms. Is the fuse bad, or is the SD card somehow using that much power?

I've tried 5 different chargers, and none of them gets TP1>TP2 over 4.6 volts. I just plugged in a new charger (found here) which gives it 4.4 volts with only SD card attached, but 4.8 with SD card removed.

I tested the power at the outside of the polyfuse without SD card inserted: 4.94 volts Other side: 4.86 volts So far, so good. Power off Pi, insert SD card, power up Pi and test again: 4.78 volts outside, 4.39 volts inside.

I tested the resistance of the F3 polyfuse, it seems to be a constant 1.2 Ohms. Is the fuse bad, or is the SD card somehow using that much power?

I've tried 5 different chargers, and none of them gets TP1>TP2 over 4.6 volts. I just plugged in a new charger (found here) which gives it 4.4 volts with only SD card attached, but 4.8 with SD card removed.

I tested the power before the polyfuse without SD card inserted: 4.94 volts 
Voltage after polyfuse: 4.86 volts

So far, so good. Power off Pi, insert SD card, power up Pi and test again: 4.78 volts before polyfuse, 4.39 volts after polyfuse.

I tested the resistance of the F3 polyfuse, it seems to be a constant 1.2 Ohms. Is the fuse bad, or is the SD card somehow using that much power?

Tweeted twitter.com/#!/StackRaspi/status/406735238531125248
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coderMe
coderMe
  • 131
  • 3

Where is my RPi losing power?

I've tried 5 different chargers, and none of them gets TP1>TP2 over 4.6 volts. I just plugged in a new charger (found here) which gives it 4.4 volts with only SD card attached, but 4.8 with SD card removed.

I tested the power at the outside of the polyfuse without SD card inserted: 4.94 volts Other side: 4.86 volts So far, so good. Power off Pi, insert SD card, power up Pi and test again: 4.78 volts outside, 4.39 volts inside.

I tested the resistance of the F3 polyfuse, it seems to be a constant 1.2 Ohms. Is the fuse bad, or is the SD card somehow using that much power?