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A sad day for my Mark V - over voltage


dwek
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Hi all,

I accidently connected a 12 V DC supply to my Pineapple and started to smell funky - it smelt like it overheated.

Now when I connect the correct power supply, the lights do not turn on.

When I connect a USB external charger to the USB on the Pineapple, all the lights flash.

As I said... A sad day!

Is there anything I can do to replace parts on the PCB to recover the device or purchase a new board?

Other than purchasing a new device at the full price, is there any other options?

It's one of my favorite multi-function devices.

Thanks in advance.

Edited by dwek
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Yeah I have read many posts that say it can handle 12V, but the other PSU is definitely a 12V DC with the right polarization according to the label.

I'll check the other PSU with a multimeter and oscilloscope, but the supply is new and used with another Arduino board.

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What kind of power supply did you use? Was it a regulated power supply?

A high current un-regulatated wall wart power supply can have an open circuit voltage of 16V or higher. You should never use an un-regulated power supply... unless you are 100% sure the device you are using it with can handle it.

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I'm pretty sure you can't backfeed through USB to power the pineapple. I'm not sure why people think this is a possibility. It may work, but chances are you will break it.

I suspect you're right with the Mark V, it used to be possible with the old Pineapple. I used the USB many times from a USB battery and directly from a PC USB port.

I can imagine the current requirement and possibly the 9V DC source is more important with the Mark V.

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What kind of power supply did you use? Was it a regulated power supply?

A high current un-regulatated wall wart power supply can have an open circuit voltage of 16V or higher. You should never use an un-regulated power supply... unless you are 100% sure the device you are using it with can handle it.

Regrettably I suspect this is the case here.

The PSU I used was for a Arduino board, but the intended board appears to have a some regulation.

I confirmed the output voltage of other supply on a 10M ohm probe and it is about 17.3V,although on a DC digital multimeter it is 12.5V.

I wonder if there is a CCT diagram available to see if I can replace any of the components to resurrect the device.

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