820-01958 no DFU

[raainxx]

Hi,
this Mac fall on the floor, no liquid spill. I have 20V 1,2A normally the Mac charge.
But no chime, no display. I can't put the Mac in DFU.
I measure

PP1V2_AWAKE 1.2V
PP1V8_AWAKE 1.8V
PP3V3_AWAKE 3.3v
PPVDDCPU_AWAKE 0.755v
PPVDDCPUSRAM_AWAKE 0.802v
PP0V8_SLPS2R 0.800v
PP1V8_SLPS2R 1.8v
PP1V25_SLPS2R_SMC_AVREF 1,2v
PP1V1_SLPS2R 1.1v
I try a mouse on the USB port and a externe HDD, no light.
can you help me please?
thanks

 

[2informaticos]

Very likely broken solders, or traces.
Dropped machines are nightmare.

Do you get voltage on any big coil?
Check if starts disconnecting audio flex.

 

[raainxx]

OK i have nothing but no short on L9060, L7210, L7400, L7230, L7220, L8410, L8100.
Diode mode: L9060=0,355, L7210=0,135, L7400=0,158, L7230=0,135, L7220=0,135, L8410= 0,865, L8100=0,165.
I try without audio flex, same problem.

 

[2informaticos]

G3S and SSD voltages come on?

Remove the board from shell and test it alone on the desk.

 

[raainxx]

PP1V8_G3S = 1,8V
PP5V_G3S=5V
PPBUS_G3=12,6V
PP0V9_SSD0=0,9V
PPVCC_NAND_SSD0=2,5V
PPBUS_G3H_SSD0 = 12,6V
With board remove of the top case, and alone on my desk.

 

[2informaticos]

It should enter DFU.
If not, I can only suspect "broken solders, or traces", as first mentioned.
Probably waste of time...

 

[raainxx]

no I can't enter in DFU, I don't waste more time, thanks