UART not working in Beaglebone black

General Discussion
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21

Hi @jagdish_singh , I’ll try this out but when I just checked with claude and ended up finding few things .

  1. I don’t think the issue is with just software , the issue is in hardware . Measured the reading in J1 pins 1 to 6 got 0V in all pins , and in different test points across the board from TP1 to TP9 below are the readings

miniusb connected to laptop , tp6 is black probe/GND

tp1 -0.42
tp2 0.78
tp3 0
tp4 2.55
tp5 -0.65
tp7 1.60
tp8 -0.43
tp9 2.43

image
image1010×774 62.6 KB

  1. Tried to use P24 and P26 and P1 as GND as they too are UART , that too didn’t help .

I think some connection which I have tried out may caused a short circuit . As of now PMIC is working and board is powering up .

Is there a way I can confirm which exact point got short circuited and can it be fixed by re-soldering ? Is there any service companies that could help on checking the board (I’m a beginner guys ) , tried beaglebone RMA too haven’t got any response .

Apologies @amf99 for delayed response :frowning:

22

these are UART1 pins, the debug connector is UART0.

being you think you have damaged UART0 (debug), take a look at U15, located on the bottom side of the BBB next to the J1 pins. make sure you don’t see any burn marks around it.

a last question: you are using a 3.3 volt USB-serial cable?