820-01958 not work

hello,
please i have mainboard 820-01958 with liquid damage
i have 5V and not start. I have L6960 and U6960 beacause are damaged by water. Macbook start and have 20V. Image working and macbook start normally.
the problem is that my employer did not screw it in for the tests. Since then the machine no longer starts. Let me explain, we have the ignition on and the fan is turning. Unfortunately no caps lock and no display.
the machine goes into DFU we tried a reset but nothing happens.
The coils close to the CPU give values: 1.67V for L7400 - 1.60V for L7230/20/10
When we plug in the charger we hear the charging dong.
Of course the audio deck is not connected and same problem
The F8400 fusile is good too and gives us 12V
PPVOUT_S0_LCDBKLT_F = 0v
 
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