discovery stm32f4's ld1(usb communication)not works

[s239955_stm1_st]

Posted on January 07, 2015 at 08:34

hi

there is a problem

when i connect my discovery board to the computer and USB port, the LD1 on board not works

and +5 volt pins on the board, have +2.67 volts

the 4 user led's have very low light ...

whats the problem?

[s239955_stm1_st]

Posted on January 07, 2015 at 08:44

i found this link

http://rusefi.com/wiki/index.php?title=Hardware:stm32f4discovery_repair

it passed step one

but in step 2, i can not understand what is the ''TBD''??

''

Step 2 Check the target ST chip

Setup the Discovery like this

Description of what is being check

Check(s) to determine what solution to follow.

TBD

Setup the Discovery like this

Description of what is being check

Check(s) to determine what solution to follow.

TBD

Setup the Discovery like this

Description of what is being check

Check(s) to determine what solution to follow.

TBD

''

[s239955_stm1_st]

Posted on January 09, 2015 at 16:10

oh

i observed that ld8 in ON with a low light

this is a over current led for pd5 that connects to the USB-otg full speed

i have not used it for this application and it is free now

now, i have disconnected all of pins and port, but yet this problem exists

may this board have broken?

[Tesla DeLorean]

Posted on January 09, 2015 at 16:50

TBD - To Be Determined - I haven't worked this out, or written it yet.

Yes, you may well have broken your board, you might want to check the regulation circuit. Review schematic, and follow the design flow.