Stewieman01
New member
I've designed ordered and assembled 2 teensy 4.0 custom PCBs in strict accordance to the 4.0 schematic with no real design changes as this was to test myself as I have never undertaken such a complex PCB. The GitHub link with the files are here.
After assembling the 1st Teensy board the TLV7533 Regulator only outputted ~0.2V with a ~1.2V enable signal from the processor. I replaced the regulator with a new one and no change. I couldn't find any visible shorts so I rebuilt the board a second time and at first the regulator heated up quickly which i found was due to a short from bootloader, except since resolving the shorts and replacing the regulator again, the Regulator only outputted ~0.4 with a ~1.4V en signal.
While these new results are higher, i believe from reading other peoples threads this low output Voltage is due to an internal short likely within the Processor, bootloader or both which considering the bootloader was the last component i replaced, i imagine the processor could be to blame.
My understanding is that within the Processor some sections like the enable frequency portion of the start up sequence would still work, even if there is an internal short somewhere, although it doesn't build up excessive heat at all.
My question, is there a way to test the processor to see if its the culprit? are there certain values from certain pins/components that can prove the processor is/not at fault?
with first time soldering bga i have constantly worried about it being a short from soldering but as far as i can tell its not, although if there was a way to prove this that would be very helpful
Thankyou for any guidance that you may be able to provide, being a first year Uni student im worried ive thrown myself into the deep end of electronics and may have to pay the price for this (literally!)
Alex
After assembling the 1st Teensy board the TLV7533 Regulator only outputted ~0.2V with a ~1.2V enable signal from the processor. I replaced the regulator with a new one and no change. I couldn't find any visible shorts so I rebuilt the board a second time and at first the regulator heated up quickly which i found was due to a short from bootloader, except since resolving the shorts and replacing the regulator again, the Regulator only outputted ~0.4 with a ~1.4V en signal.
While these new results are higher, i believe from reading other peoples threads this low output Voltage is due to an internal short likely within the Processor, bootloader or both which considering the bootloader was the last component i replaced, i imagine the processor could be to blame.
My understanding is that within the Processor some sections like the enable frequency portion of the start up sequence would still work, even if there is an internal short somewhere, although it doesn't build up excessive heat at all.
My question, is there a way to test the processor to see if its the culprit? are there certain values from certain pins/components that can prove the processor is/not at fault?
with first time soldering bga i have constantly worried about it being a short from soldering but as far as i can tell its not, although if there was a way to prove this that would be very helpful
Thankyou for any guidance that you may be able to provide, being a first year Uni student im worried ive thrown myself into the deep end of electronics and may have to pay the price for this (literally!)
Alex