820-3476 has PM_SLP_S4_L, and all PP5v Rails

[dukefawks]

CPU Vcore will never reach 3V and if it really does the CPU is dead. I ask again is CPU Vcore pulsing on L7310?

 

[Titotinton]

Hi Duke!! Its pulsing from 2.9 Volts To Zero, And then 2.9 volts to zero!!

so its fried, right ?

 

[dukefawks]

It would be very unusual for this to happen. Maybe the multimeter is freaking out. Do you have a scope that can capture the pulse? Did you check on pin 2 of L7310? The other side has lots of switching mode garbage on it which may mess with the meter.

 

[Titotinton]

Hi Duke, thanks for the reply!!

yeah, its pin2 of L7310, dont have a scope , i try other multimeter, and it goes to 3.3 to zero, sometimes 3.9 to zero, its worst. I change the Multimeter cables with other new ones, and the same

 

[Titotinton]

Hi Duke, any more troubleshooting, can you guide me to do more measurements

Thanks

 

[Titotinton]

Heya Duke!! Any more troubleshooting ????

Thanks

 

[aprendiz]

3.9V on 1.8V rail, this could be a dead CPU, also maybe you are measuring in the unfiltered pin of the coil (pin 1), measure the voltage on R7310.....

 

[Titotinton]

Hi Aprendiz, its pulsing on all four pins of R7310, pin 1,2,3,4 pulsing from 3.7 volts to zero, and cycling

 

[Titotinton]

Fellow Aprendiz!! Thanks for the reply other thing, is there a way to ¨ disable the cpu ´a filter or a resistor, so that i know if the other voltages are stable and not pulsing, If that happens i know the cpu is the problem!! I hope you understand!! Thanks for your time

 

[Titotinton]

Aprendiz ??✌?️✌???

 

[Titotinton]

Duke !! Help me ??

 

[dukefawks]

If you are 100% sure that there are 4V pulses on CPU Vcore then the CPU has already died. I still very much doubt that your measurement is correct though....