BQ24193 low VBUS input in a nsw oled

xiran64 · 2024-11-12T04:07:25+0000

Hi to all!

I´ve a NSW oled, that won´t charge.

I´ve remove the fuse, to see if is the charging port, and put 5v to the nearby capacitor in Vbus line, it have a very low consumption, 0.11A.

I´ve have a nsw lite, to compare, an it don´t have consumption, without the battery both, only board. I´ve replace mt and bq, with same result...

Pin one of bq, it´s onle 0.18v

Can somebody guide me please?

thesjaakspoiler · 2024-11-12T05:42:31+0000

There is a ton of information in the Switch section of this site :
https://www.retrosix.wiki/first-stage-boot-short-checks

xiran64 · 2024-11-12T16:26:44+0000

Thx for answer thesjaakspoiler!

I´ve see that page, but i´ll check again.

UPDATE:
I´ve check the MAX77620 & MAX77812, and have this voltages:

UPDATE2:
Voltages in BQ24193:

jkyoho · 2024-11-12T18:36:06+0000

missing 1.3v from MAX77620H is likely tend to be EMMC or CPU related, unless you are powering the board from external DC supply not from battery

xiran64 · 2024-11-12T18:54:08+0000

jkyoho said:
missing 1.3v from MAX77620H is likely tend to be EMMC or CPU related, unless you are powering the board from external DC supply not from battery

Thx for answer jkyoho, i´am injecting voltage from an external power source, 4.2V to the coil

jkyoho · 2024-11-12T18:55:37+0000

xiran64 said:
Thx for answer jkyoho, i´am injecting voltage from an external power source

show your setup

xiran64 · 2024-11-12T19:02:42+0000

jkyoho said:
show your setup

Here you have it, 4.2V@1A

jkyoho · 2024-11-12T19:17:17+0000

Do you put 10k resistor next to battery connector?

xiran64 · 2024-11-12T19:22:53+0000

jkyoho said:
Do you put 10k resistor next to battery connector?

it's right

jkyoho · 2024-11-12T19:26:28+0000

what's the current draw?

xiran64 · 2024-11-12T19:28:28+0000

jkyoho said:
what's the current draw?

According to the tutorial of retrosix, 1A

jkyoho · 2024-11-12T19:30:31+0000

xiran64 said:
According to the tutorial of retrosix, 1A

No, I mean how much the board draws when you trigger power on

xiran64 · 2024-11-12T19:42:37+0000

jkyoho said:
No, I mean how much the board draws when you trigger power on

Ok, first try, with 4.2@1A, consumption of 0.188A, stables ( stuck between 100 and 300mA).
Uploaded to 2A:
1st try: Consumption variable, and voltage in battery pin, of 4.2V.
2nd try: Stable consumption of 0.188A
3nd try: same as 2nd

jkyoho · 2024-11-12T19:56:11+0000

take a picture on emmc, any attempt sign?

xiran64 · 2024-11-12T20:04:53+0000

jkyoho said:
take a picture on emmc, any attempt sign?

Here you have it, Voltage included in surrounding capacitors, one is 0v

Post automatically merged: 12 minutes ago

Checking the mosffet at the begin, near usb c, i´ve found a short in the first mosffet, so, i´ve exchange it, from another nsw lite, and the suspicious mosffet, works in the lite...

BQ24193 low VBUS input in a nsw oled

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