a1990 820-01041

[lordgeny]

a1990 820-01041 stuck on 5v
i have no PP3V3_G3H_RTC_X

it also in diode mode i read 0.025

i readed its generated from u6960 and also i have no voltage in vin at c6961

[mon2]

Re: a1990 820-01041

What is the voltage of PPBUS_G3H @ F7000, pin # 2 ?

When 5 volt (default) from the external adapter is the power source, U7000 will enter BOOST mode for the PPBUS_G3H rail.

Remove the battery and use only the external USB C power adapter and measure this voltage.

Do check also F7000, pin # 1.

If you see a low voltage on this rail, then remove all power -> remove F7000 and then power up again with the external adapter.

Then check again the voltage of PPBUS_G3H

@ F7000, pin # 1 - what is the reading without a load (no fuse) ?

[lordgeny]

Re: a1990 820-01041

F7000 pin 1 no voltage
f7000 pin 2 no voltage

[lordgeny]

Re: a1990 820-01041

i used another usb-c (right side ) and i have 12v on f7000/f7001 pin 1 without fuse

[lordgeny]

Re: a1990 820-01041

putting back fuse i have pulsing voltage around7v/8v both side of fuse

[lordgeny]

Re: a1990 820-01041

this port is using u 3200 , and i have also PP3V3_G3H_RTC_X but no 20v ... ...

[lordgeny]

Re: a1990 820-01041

ok i found that ub400 was heating , so i removed and now ppbus its back at 12v , i need new ic