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Author Topic: Fried Pi anyone?  (Read 459 times)

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DaOld Man

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Fried Pi anyone?
« on: June 15, 2018, 05:51:53 pm »
My latest project requires a 90 degree power connection cord.
I happened to have one on hand. A cheap short extension actually, with a 90 degree male plug on one end and a straight female on the other end.
Im using an old arcade cabinet power supply, so I cut the cord in half and hooked red to PS+ and black to PS GND.
Before I hooked it up I double checked the voltage on the power supply and it is dead on 5 volts.
So I went ahead and connected my red and black wires from the male end and plugged the male end into the Pi.
I powered it up and the Pi did not come on. Oh no!
Unplugged everything and double checked my connections, all looked good. Tried again, RPi silent as a church mouse.
So I unplugged my cable and plugged in a regular wall wart made for the Pi.
Still no go.
Im starting to get edgy now.
I took the cut off female part of the cable and plugged the male end into the female end.
Checked the voltage on the red and black wires on the female end. Nothing.
Tried plugging female end into the wall wart. Nothing on red and black.
Something in my feeble mind was saying check the other wires. (It finally got loud enough to drown out the self abuse I was thinking.)
I found this: White wire is +5 and red wire is - or ground. WTF????
I thought all usb cables wire red positive 5 vdc and black ground???
Cheap Chinese ripoffs!
Now I face the realization that i may have fried my Pi.
I read online that the onboard fuse will most likely reset itself after a few hours, or days. Its been an hour and still no go.
So I got to start thinking about a replacement Pi.
Moral to this long story: Always double check before applying the juice. Dont take anything for granted.
If I had plugged the male end into the female end and checked voltages first, I may have saved a big headache. (And cost of a new Pi)
You live you learn I guess. Now wheres the Tylenol?



DaOld Man

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Re: Fried Pi anyone?
« Reply #1 on: June 15, 2018, 06:07:54 pm »
Quick update:
I connected GPIO pin 2 to +5vdc on the power supply, and pin 6 to GND and the Pi booted up.
I understand that this bypasses the onboard fuse, so I know now that the fuse is the culprit.
Only problem about powering it like this, I bypass the fuse, which is the protection device. I dont like doing that.
Plus I will be using a mausberry switch circuit board to turn on and off the Pi.
Since I have the mausberry board that plugs into the Pi's power socket, I dont think I can use it like this. (This is why i need a 90 degree connector in the first place.)
I will give the fuse more time and see if it resets.

DaOld Man

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Re: Fried Pi anyone?
« Reply #2 on: June 15, 2018, 10:46:12 pm »
Ok after much troubleshooting, I have found the fuse is ok.
But the micro usb connector is bad, probably burned up a contact in it.
Am now going to attempt to solder my female half of the crappy Chinese cable to the test pads (PP1 and PP5), underneath the connector.
That way I will still have the protection of the fuse and be able to plug in my mausberry switch.
I will try to post a pic of that adventure.
But not tonight.


Titchgamer

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Re: Fried Pi anyone?
« Reply #3 on: June 16, 2018, 03:45:44 am »
Ouch!

Good luck!

Marcoqwerty

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Re: Fried Pi anyone?
« Reply #4 on: June 16, 2018, 06:34:09 am »
This remind me something, right dude?

RPI its a clue under all kind of aspect...electrically included  :badmood:

DaOld Man

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Re: Fried Pi anyone?
« Reply #5 on: June 16, 2018, 08:00:06 am »
Marco: Tell me about it!  :banghead:

Well I got the female part of the cable soldered on and even though it looks like crap on a cracker, it's going to work.
Im also able to bend the short connector cable to allow me to use a straight male connector, since the 90 degree one is now in the trash can.
Heres a few pics.

Pic 1 and 2 were stolen from the web.
Pic 1 is the power input schematic of the RPi, showing the test points.
Pic 2 is a picture of the bottom of the Rpi, highlighting the test points (red is + and black is ground).
Pic 3 is my hack job on mine.
I connected the female connector to PP5 (GND) and PP2 (+)
Since this cable I hacked has the wire colors sorted around I soldered the white wire (which is really +5VDC) to PP2 and the red wire (really GND) to PP5.

What an adventure this has been. Hopefully someone else will use this to help them out in the same situation.

  
 

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