820-01827-A - Sudden death - 19V missing all USB-C port

[samstown]

Hello,

I got this A1990, sudden death, no 19V on all port.

I've disconnect battery and charger and focus on big coil value to ground (in blue on the pics).

I will user 820-01041 in boardview

Thanks
Sam

 

[2informaticos]

Do you get PPBUS_G3H and 3V3_G3H_RTC?
If any missing, post diode mode to ground.

 

[samstown]

thanks. I get nothing on both.

Diode mode to ground = 0.25

USB-C chip not talking to charger ?

 

[2informaticos]

You can't get same reading on both rails.
Please, post accurate information.

Do you get 5V at R7020?

 

[samstown]

Sorry, 0.331 on 3V3_G3H_RTC

Yes, I get 5.16V at R7020.

 

[2informaticos]

So you get 0.25 at PPBUS_G3H?

Post basic U7000 voltage; P_IN, AUX_DET, VDDA/P, EN_MVR, CBC_ON, A/BMON.

 

[samstown]

PPBUS_G3H = 0.29V
PPBUS_G3H Diode Mode = 0.03

 

[samstown]

Boardview is not exactly same my board, I am not sure which one is U7000. Is it always
IC ISL6259 QFN32 6259AHRTZ 9AHRTZ ?

 

[samstown]

according to boardview this could be U7000, looks different compare to what I watch on video.

 

[samstown]

Could be this one? What I can say is both have 0 V on all components on the pics.

 

[2informaticos]

You have T2 machine, where ISL9240 is used; very small BGA chip; on the other board's side.

"PPBUS_G3H Diode Mode = 0.03"
No reason to connect power anymore; need to find the culprit first.
Check diode mode to ground on all big coils; see if any has similar value.

 

[samstown]

Thanks. Ok, no 0.03 on big coil. I am looking for ISL9240 on verso... not found yet.

 

[2informaticos]

Check this...

 

[samstown]

thanks. There's a few caps and resistor to GND.

 

[2informaticos]

Compare with 01041/1814 schematic/boardview to identify these components.

 

[samstown]

Thanks. So shorted to GND by U7000. Need to replace that chip. Anything else to test before ?

 

[2informaticos]

Why do you think the culprit is U7000???

Check resistance to ground at CPU big coils (all of them).

 

[samstown]

I did Big coils. Need to do medium one (in blue) ?

I said U7000 as those components are all to GND trough U7000.

 

[2informaticos]

Yeah, that ones too; even L9080/580 for SSD.
Look at schematic and check ANY coil which is part of a secondary power supply connected to PPBUS_G3H.

I'm pretty sure U7000 is not the culprit here.
As per schematic, the marked point is connected to PPBUS_G3H.

 

[samstown]

I've measure all. You think I should find a coil open ?

What do you mean by "the marked point is connected to PPBUS_G3H" ?