Pi won't boot with noise and PWR lit only

Rebuild SD card with the latest version OS rom the web.

Clem

I've rebuilded the latest raspbian jessie lite but to no avail.

Look at http://www.element14.com/community/thread/48472/l/raspberry-pi-2-appears-dead to check a possible problem.

Clem

I don't have the tools to power up a pi from gpio. I've tried with a few sd cards that are working on my other pis but it just wouldn't work at this pi. I've already most all of the methods here R-Pi Troubleshooting - eLinux.org  except for the polyfuse one. I don't have a multimeter but I do have this https://gd3.alicdn.com/bao/uploaded/i3/TB10XaoKpXXXXb_XXXXXXXXXXXX_!!0-item_pic.jpg_600x600.jpg and this power output is enough (4.8v 1A). Is the sound made when I boot up the pi a concern over here? because I feel like it does but I don't know which component causes it

Do you have a soldering Iron and an old but good USB cable, if so

Cut the end of the USB cable that would go into the PI (Not the end that goes into the power supply)

expose the power wires from the cut end of the USB cable

Make sure the power adapter is giving out 5V (USB specifications allow it to go well below 5V, but the PI may not work), you say your PSU is 4.8V, If this is with no load then it will be less than this once connected and I feer too low for reliable operation, you need to have a better power supply that reads 5 or more volts with no load or 5 when connected to the pi

now connect these to the 5V and 0V GPIO pins taking care to connect only the 5V and 0V pins and not short to ither pins

There is nothing on the PI that should be making a noise, if there is a noise from the PI, this would imply that it is heat related and is a component of some sort expanding or contracting or the inductor on the power supply buck reg is acting up so even by supplying 5V via a GPIO pin does not ensure the PI will work as the 3V3 rail could be the issue and that is generated on board.

Can someone describe the sound?  I don't have speakers handy.

RasPi doesn't have anything that should be making a sound, so if it is something is broken.  I recommend checking various voltages with a multimeter: 5V, 3.3V, 1.8V, etc.  A stethoscope or even a drinking straw might help localize where the sound is coming from.

Hard to hear, but there is a low noise. John Beetem

It is a high pitched voice. After some googling, I believe that my situation is somewhat like this(except that my pwr will always lit) https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=124239 I'll get myself a multimeter later as well as to boot the pi up from gpio

wcy pierre wrote:

 

It is a high pitched voice. After some googling, I believe that my situation is somewhat like this(except that my pwr will always lit) https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=124239 I'll get myself a multimeter later as well as to boot the pi up from gpio

A high-pitched screech (or whine, depending on how sensitive your ears are) is probably one of the inductors L1 or L2.  As mahjongg suggests at the link, it could be that the switching regulator is overloaded.  This can happen if a chip fails with a short, and may not be repairable.  It could be a spec of conductive debris has shorted out a couple of pins, which might be able to be blown out with air.