Featured Articles
Announcing Pi
Technical Specifications
Raspberry Pi FAQs
Win a Pi
Raspberry Pi Wishlist
Actions
Forum Thread Details
  • State Not Answered
  • Replies 4 replies
  • Subscribers 661 subscribers
  • Views 1061 views
  • Users 0 members are here
Related

Supplied Pi 4 with 9V 3A supply.

Suresh69

Hey 

I made a lithium ion based battery pack and by mistake supplied the Raspberry Pi 4 model B with 9V 3A supply via a buck converter regulator. As soon as I connected Pi with the 9V supply the red PWR light came ON but this time unusually only RED light came ON and the green ACT light did not come ON. I realised that quickly and removed the 9V 3A supply. Now  after realising that the pi needs only 5.1V 3A supply I again supplied the Pi with 5.1V 3A supply...this time also only Red PWR light comes ON and ACT green light shows no response....also one more thing I noticed is that the raspberry Pi 4 board is getting really Hot near the ethernet port area. I think the raspberry Pi board has shorted the current path... Please help ... Maybe the board has gone in protection mode so the power input is shorted. Please help.can the board be Reset? Is there a hard reset option.... everything on board looks fine...no noticable damage on board 

Parents
  • 0

    If it's getting hot, it's likely you have killed something on the board.

    image

    The only protection against overvoltage that I can see is D1 - a SMBJ5.0A-TR TVS diode that should clamp the voltage (as best as it can). Chances are, this protection diode may have been damaged by your mistake and the first point of repair may just be to replace this diode.

    If it failed to clamp the voltage sufficiently, then downstream devices are likely to become damaged - such as the power management IC (U2) and core supply switching converter (U3) for example.

    There doesn't seem to be anything in the Ethernet port area that should be getting very hot ... the only large component seems to be a capacitor ... normally, the temperature looks like this:

    image

    from https://medium.com/@ghalfacree/benchmarking-the-raspberry-pi-4-73e5afbcd54b

    - Gough

Reply
  • 0

    If it's getting hot, it's likely you have killed something on the board.

    image

    The only protection against overvoltage that I can see is D1 - a SMBJ5.0A-TR TVS diode that should clamp the voltage (as best as it can). Chances are, this protection diode may have been damaged by your mistake and the first point of repair may just be to replace this diode.

    If it failed to clamp the voltage sufficiently, then downstream devices are likely to become damaged - such as the power management IC (U2) and core supply switching converter (U3) for example.

    There doesn't seem to be anything in the Ethernet port area that should be getting very hot ... the only large component seems to be a capacitor ... normally, the temperature looks like this:

    image

    from https://medium.com/@ghalfacree/benchmarking-the-raspberry-pi-4-73e5afbcd54b

    - Gough

Children