The electrical area above the ball at F3 (bottom left corner corresponding with PA07) is smoke burned and destroyed when 5V bus power is present.
Steps to reproduce
Observe the area above ball F3
Insert a powered USB cable in J2
Expected result
Part of the MCU should not be destroyed when bus power is applied.
Actual result
Part of the MCU is destroyed and magic smoke escapes.
Workaround
Cut the trace from C5 to PA07.
Severity level
This is high priority because circuit damage is imminent.
# USB bus power destroys MCU PA07
## Problem environment
The electrical area above the ball at F3 (bottom left corner corresponding with PA07) is smoke burned and destroyed when 5V bus power is present.
## Steps to reproduce
1. Observe the area above ball F3
1. Insert a powered USB cable in J2
## Expected result
Part of the MCU should not be destroyed when bus power is applied.
## Actual result
Part of the MCU is destroyed and magic smoke escapes.
## Workaround
Cut the trace from C5 to PA07.
## Severity level
This is **high priority** because circuit damage is imminent.
USB bus power destroys MCU PA07
Problem environment
The electrical area above the ball at F3 (bottom left corner corresponding with PA07) is smoke burned and destroyed when 5V bus power is present.
Steps to reproduce
Expected result
Part of the MCU should not be destroyed when bus power is applied.
Actual result
Part of the MCU is destroyed and magic smoke escapes.
Workaround
Cut the trace from C5 to PA07.
Severity level
This is high priority because circuit damage is imminent.
Resolved by
95df659.