820-01041 not turning on

andrespi

New member
hello i'm new, I have a board does not turn on, the usb c ammeter 5.1v 0A in all usb c ports,
PPBUS_G3H=0
PPDIN_G3H=5.1V
PP3V3_G3H_RTC_X=0

I do not know what measures to take more in these new computers t2 chip
 

2informaticos

Administrator
Staff member
PPBUS_G3H is the first power rail to come on; even with only 5V at USB-C port.
Check diode mode to ground.
 

2informaticos

Administrator
Staff member
Post the exact ohm resistance to ground at PPBUS_G3H and all big coils near CPU.
Use ohm scale, not diode mode.
 

andrespi

New member
PPBUS_G3H=4 OHMS
L7410=6.6 OHMS
L7420=6.6 OHMS
L7211=3.1 OHMS
L7221=3.1 OHMS
L7231=3.1 OHMS
L7330=20.6 OHMS
LA340=2.2 OHMS
LA640=2.2 OHMS
LA650=2.2 OHMS
LA350=25.5 OHMS
LA300=341 OHMS
 

2informaticos

Administrator
Staff member
Looks safe to inject voltage into PPBUS_G3H.
First be VERY sure no short between PPBUS_G3H and any secondary coil!

Start with 1V and increase slowly, untill detect something hot; possibly a filter cap.
Set the amp limit of lab PSU to max.
 
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