820-00928 20V wont boot


Board from another shop with previous repair attempt.

L4004 burn out and has been replaced with jumper and PP5V_S0_ALSCAM_F got 0.380V in diode mode.
There is some liquid damage around U7370, U7220.
There was some work with U7220, U7210/20.

Diode mode on big coils is 0.002V-0.004V.
Removed U7220, U7210/20 and diode mode reading on big coils are still the same.

Any idea what next to check?


Staff member
Switch to ohm scale for very low readings in diode mode.
And compare values with good board.
CPU has low values as normal, depending on model.