Originally Posted by joerg_rw

The protection is to isolate $random_cable introduced mess from N900, as

Code:

$random-cable -> connector -> protection -> N900-internal

there's little use in doing sth like

Code:

your-protection -> $random-cable -> your-connection-to-testpoints -> N900-internal

Also without proper tools and experience/expertise you'll fail on that approach as much or even worse as/than you'll fail on the suggested proper fix of USB receptacle, as shown in the thread linked to in a former post of this thread



For a general note and advice regarding these testpoints: they are fine for using a properly designed service jig mount or sort of cradle to contact them. They are also ok for an emergency recovery setup, given you make sure there are no wrong signals, static charge, wrong voltages and/or polarities and so on. Most important: Alsways make sure to first connect the GND of your auxiliary contraption and the N900 GND, to avoid static discharge smoking up N900's chips


/j