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| == Troubleshooting == | | == Troubleshooting == |
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| === Power issues ===non-functionalnon-functnon-functionalionalnon-functional
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| The Raspberry Pi 4B is as power-hungry, if not more, as its predecessors. It is important to have a [https://www.raspberrypi.org/documentation/hardware/raspberrypi/power/README.md sufficient enough power supply] or ''weirdness'' may happen. Weirdness may include:
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| * Lightning bolt icon on HDMI output "breaking" the display.
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| * Screen switching back to u-boot text
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| ** Fixable temporarily when power is sufficient by switching VT (alt+F2 / alt+F1)
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| * Random hangs
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| {{note|A ''properly rated'' USB power supply, AND a good cable are necessary. The cable has to be short enough to not incur power losses through the length. Do note that thin and cheap cables usually have thinner copper wires, which in turn accentuates power losses.}}
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| Note that the Type-C USB receptacle for the Raspberry Pi 4B '''does not implement Power Delivery (USB PD)'''. This means that it is limited to whatever the power supply will provide when not negotiating power, which is most likely 5V at some undetermined power level.
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| === Audio not playing and Bluetooth: no controller available === | | === Audio not playing and Bluetooth: no controller available === |
