820-01700 No power 20V 0.07A no battery. 20V 2.5A with battery

[2informaticos]

"L9580 to Ground 4.7OHMs
Can't find any short."
How not?
4.7 ohm is almost pure short; correct value is aprox 0.425 in diode mode.

Sorry, but ADIOS data...

 

[ronaldo]

Ok. It may sound stupid or I'm being stupid, but I was measuring short to ground in Ohms by setting my multimeter to OHMS and black probe to ground and red probe on the L9580 - P2V5_SW1_TPS62180_SSD0.
Before it was showing 4.7ohms.
Now it keeps increasing till reach 20.2K.

In diode mode
L9580 - 0.380
L9581 - 0.380

 

[2informaticos]

Then no short at all.
0.380 can be good.
You can't expect exact the same reading on different boards; even are the same model.

Is the battery charging?
Try DFU with (good) battery connected.

 

[ronaldo]

Yes, battery is charging.
Ok I will try DFU with a good working battery tomorrow.

 

[ronaldo]

I just tried DFU revive with another good battery and same results.

 

[ronaldo]

820-01700 - T2 pulsing

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On this video, you can see T2 chip pulsing.

I don't know if it was pulsing before, but I just realized now that these lines are pulsing every 2 sec.
PP1V8_SLPS2R → Pulsing
PP1V8_AWAKE → Pulsing
PP1V1_SLPS2R → Pulsing
PP0V8_SLPS2R → Pulsing
PP0V82_SLPDDR → Pulsing
PP3V3_AWAKE → Pulsing
PPVDDCPUSRAM_AWAKE → Pulsing
PP0V9_SLPDDR → Pulsing
P1V1_SLPDDR_SOCFET_EN → Pulsing
PP1V1_SLPDDR → Pulsing
PP1V2_AWAKE → Pulsing
PPVDDCPU_AWAKE → Pulsing

L9580 - P2V5_SW1_TPS62180_SSD0 - 0V

 

[2informaticos]

PPBUS_G3H and 3V3_G3H_RTC also pulsing?

 

[ronaldo]

Not pulsing.
PPBUS_G3H - 12.30V
3V3_G3H_RTC - 3.38V

 

[2informaticos]

T2 voltages have been stable, if it was detected in DFU mode.
What happens in the meantime?

Using original 96/140W charger for sure?
Check diode mode to ground on all big coils; including SSD related.

 

[ronaldo]

The charger I'M using is an original 96W.
All the coils are good in diode mode, including SSD.
Do you think that there is any chance that U7800 - CALPE-PMU is faulty?

 

[2informaticos]

Diode mode readings on the small coils arround U7800 match good board?

You may have problems with T2, or PMU.
U7800 LDOs are stable?