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Repair information for the Raspberry Pi 1 Model B+. Released in July of 2014. Model: B+.

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Network (Wired and wireless ) sectors and usb without electricity

My model is raspberry pi b.

When I connect the device to the power, it starts to boot without problems, but there is a flashing yellow mark on the corner of the image.

But the usb section and the network segment do not work.

I replaced the power adapter and cable, but the problem still failed.

There is a part called polyfuse that I tested, which seemed to be healthy.

Answer this question I have this problem too

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By flashing yellow mark, do you mean a lightning bolt in the top left corner? This means that the Pi is not receiving enough power. Have you tried an OFFICIAL Raspberry Pi power supply, and not something like a phone charger?

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mohammad will be eternally grateful.
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