USBHost_t36 not reading

ExNoise

Member
Hi, my teensy 4.1 is not reading usb signals anymore, i (clumsily) soldered on the headers on the teensy board and it worked until today. I tried some example sketches for the USBHost library (mouse and inputfunctions) and yesterday the mouse turned on and serial monitor gave it’s coordinates, this worked both directly and through a powered USB hub. I could also get midicontroller input and use it in a sketch. now the code runs but the red light from the mouse only turns on when connecting to the powered hub -Edit: i resoldered the 5v+ pin and the light now turns on - but no input is received. Last night i turned off my computer with the teensy connected through micro usb and the powered hub connected to the teensy host port, i guess the teensy turned off when the computer turned off but the hub stayed on all night, could this be the cause of damage? My soldering skills also aren’t that great yet and although i managed to get the host port connected and working, i made quite the mess and had to redo it multiple times, i tried to clean off some of the rubble with contact spray and a toothpick and i noticed there is a little black dent inside the letter D printed above the d+ pin. The resistor to the left of the first gnd pin also looks damaged but yesterday it didn’t seem to impact any functionality. I wouldn’t be surprised if i damaged something on the board. Anyway how do i troubleshoot this?
 
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I also measured the resistances between the pins to see if there’s anything shorted, between the 2 ground pins there is effectively zero resistance but considering they’re both ground pins i guess they’re supposed to be wired together?
The resistance between ground and either data pin is around 2.1 mega ohm and the resistance between d+ and d- is 220 ohms which i guess is some internal resistor that I’m reading? Then between 5v+ and d+ there’s 7.7 mega ohm
andd from 5v to gnd there’s 4.6 mega ohm
 
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