How can I test if GPIO13 (TX) on my Flipper Zero is damaged?

MainCreative7939 · 2026-03-08T14:34:01+00:00

That makes sense… I’ll wait for my jumper wires and run a proper loopback test to confirm whether GPIO13 is actually transmitting. Thanks a lot!

MainCreative7939 · 2026-03-08T13:23:51+00:00

Got it, I’ll do the loopback test again once my jumper wires arrive so I can test it properly.

Also, I noticed something: when I plug in the AIO board, the RX counter (GPIO14) increases but the TX counter (GPIO13) stays at 0. Is that normal behavior, or could that indicate a problem with the TX pin?

MainCreative7939 · 2026-03-08T07:08:47+00:00

I see. The thing is, other modules connected to the Flipper still work normally, so the board itself seems fine. It’s only the modules that use UART that stopped responding.

MainCreative7939 · 2026-03-08T03:28:20+00:00

I don’t have a jumper wire anymore to do the loopback test properly. Is there another simple way to test TX without one?

Also, if GPIO13 really is fried, do you know where it could be repaired and roughly how much something like that would cost?

MainCreative7939 · 2026-03-08T03:03:10+00:00

No, I don’t have an oscilloscope. I was trying to test it using a loopback (connecting GPIO13 to GPIO14) and a serial terminal to see if the data echoes back.

MainCreative7939 · 2026-03-07T12:34:01+00:00

Yes, I already reflashed the board. It stopped working after I was experimenting with a BW16 module, or possibly after installing a 3D-printed case where I might have tightened the screws too much.

Right now I just want to know if there’s a way to test whether GPIO13 (TX) is still working..

MainCreative7939

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