820-01949 not turn on

[andrespi]

usb c amp 5v 0.185A
PPBUS_G3H=12.3v
PP3V3_G3H=0v

 

[TCRScircuit]

History?

PP3v3_G3H is basically the VDD main rail which powers the PMU. The PMU powers the T2, which talks to the CD3217 USB C controllers.

What do you ask yourself if you find a missing voltage? Is it shorted!

Find out, and get back to us.

 

[2informaticos]

To avoid any missunderstood, do you talk about L7660 (3V3_G3H), or L6900/1 (3V3_G3H_RTC)?

 

[andrespi]

excuse me
usb c amp 5v 0.185A
PPBUS_G3H=12.3v
L7660=3.3v
L6900/01=3.3v
l7600=0v mode diode 0.423

 

[2informaticos]

Did you try DFU?

 

[andrespi]

yes already try dfu

 

[2informaticos]

Got error in DFU, or completed correctly?

 

[andrespi]

sorry, do you mean enter DFU only? or do I have to do something when I enter dfu, excuse my ignorance.at this moment I have it like this

 

[2informaticos]

If no important data on its SSD, do DFU restore.

 

[andrespi]

I get this error when trying to install

 

[2informaticos]

Try several times DFU revive and restore.
Check if SSD and G3S voltages appear.

Just in case, reflash U4770 and try again.
Don't forget to make backup in such case.

 

[andrespi]

hello, could you tell me to specify to check which name signal G3S and SSD to measure, sorry I don't have much experience in these boards

 

[2informaticos]

Mira en la pagina 75.
Despues encuentra componentes que te permitan medir lo que necesitas.

Igual para SSD; una barra de tension con "SSD" en su nombre, donde crees que va?
Habitualmente en las paginas dedicadas al SSD; 71 quizas?

 

[andrespi]

listo gracias.Ya intente restaurar dfu varias veces y aparece mismo error.Esta medicion de valores
PP2V5_NAND_SSD0=0V
PP5V_G3S=0v
Algo una cosa mas pueda hacer, o algo mas dañado antes de intentar programar U4770

 

[2informaticos]

Aveces las tensiones G3S y SSD aparecen despues de varios intentos DFU revive/restore.
Si flashear U4770 tampoco ayuda, no hay mas esperanzas...

 

[andrespi]

muchas gracias .Y esos chip CD3217B12 en que casos tu los cambias, para este caso no aplica cierto.

 

[2informaticos]

If USB-C inputs switch all to 20V, the CD3217 chips should be good.
There may be a communication problem with external USB device, but good communication with the charger at least; not usual case at all.

If you have different behavior between USB-C charging ports, there could still be a bad CD3217 chip.

 

[andrespi]

sorry for the question as a flash chip if it is not present on the board.I found a small corrosion near this chip, it may be that I need to change the chip?

 

[2informaticos]

Need to reball that CD3217 chip.
Also clean the corrosion, replace damaged components and rebuild traces, if needed.