PPBUS_G3H Shorted to ground with coil put on

[ytesfay80]

Pin 13(VREF2) is at 1.99v
Pin 22(VREG3) is at 3.32v
There is no short on L7520 or L7560 either.

 

[ytesfay80]

Anything else I should check on this?
dukefawks

 

[dukefawks]

I have no idea really. The 5V is usually used inside the regulator to drive the output FETs so maybe a bad Q7520/7560 may cause issues. Replace them both including U7501 again.

 

[ytesfay80]

replaced all 3 and I still get 1.7v on 5v_s5.
I will just have to send this back to the customer.

 

[dukefawks]

I am out of ideas too then.