Dead LPCxpreso Boards

[lpcware]

Content originally posted in LPCWare by ub3r on Thu Jul 12 01:46:40 MST 2012
Hi Guys,

I have 3 x dead LPCxpresso boards, and i think they all died for the same reason..

While the Board was connected to my USB, i connected my scope GND to Positive on the LPCxpresso causing reverse current. USB Gnd is connected to earth :(.

Does anyone know which IC needs replacing?

Cheers

[lpcware]

Content originally posted in LPCWare by elef on Sun Jul 15 06:13:10 MST 2012
Which "positive" did you connect scope GND to?
If it was the 5V then most likely the input diodes (or your USB port on the PC).

If it was the 3.3V, 1.8V or 1.2V, then most likely the onchip regulator(s) on the LPC3154. Are you getting 3.3V, 1.8V or 1.2V anywhere on the board or out of the LPC3154 at the TP's (test points)?

Either way, i would start with input diodes, check you are actually getting 5V to the LPC3154 power input.