Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

[jasko_jacker]

The notebook was totally death, no schematic or boardview so
I found out that the EC was in short, so I replaced and reprogrammed it.
I don't know if the battery was charging but now the owner tells me that the LED turns on and off immediately and the notebook worked
with the battery until it is discharged.
The two mosfets, controlled by the BQ24780S, are ok but no signal is received at the gates, ac is detected. Before doing other checks is it possible that the problem is on the EC?

[mcplslg123]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

Ec firmware can be the issue but Ec chip not likely to be bad. Extract ec firmware from lenovo official update and reflash ec to be sure.

[shibu]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

hi EC firmware can be the issue you can also extract the firmware from main bios

[shibu]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

that laptop works by adaptor?

[jasko_jacker]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

that laptop works by adaptor?

Works only with battery, no with adapter. I have downloaded the EC firmware from a paysite but I have downloaded the bios from lenovo also , there are two problem, first I think there is 6MB instead 8MB so it not contain EC firmware, second it's in .exe and uniextract it's not be able to unpack it (the battery it's full empty and I can not use lenovo to unpack it)

[SMDFlea]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

Test BQ24780S voltage,pins 4,5,6. https://cdn.badcaps-static.com/pdfs/...2a8abce3d9.pdf

[SMDFlea]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

Works only with battery, no with adapter. I have downloaded the EC firmware from a paysite but I have downloaded the bios from lenovo also , there are two problem, first I think there is 6MB instead 8MB so it not contain EC firmware, second it's in .exe and uniextract it's not be able to unpack it (the battery it's full empty and I can not use lenovo to unpack it)

To unpack use innoextract first,then 7-zip or winrar to extract the exe,then cut bios and EC using hex editor, or you can use innoextract first then change the platform.ini file from BatteryCheck=1 to BatteryCheck=0 to disable the battery check.

http://constexpr.org/innoextract/#download

[jasko_jacker]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

I extracted from fd file the 8192 K bios.bin but I don't find any ec file into this and into the two block I deleted from the fd file.
Usually I repair asus and I have some difficulties with these procedures.

[SMDFlea]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

Here`s the EC . In the fd file do a text search for ITE to find the EC.

[jasko_jacker]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

Here`s the EC . In the fd file do a text search for ITE to find the EC.

Ok,
many thanks

[shibu]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

hey buddy your problem solved or not ? i thing the problem with not EC you need to check main power line FET's and the pin 28 vcc on bq24780s it's should be 18v to 20v
if not there is a diode and a resostor from main line the resistor mostly value are 10 to 20 ohms!

[jasko_jacker]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

hey buddy your problem solved or not ? i thing the problem with not EC you need to check main power line FET's and the pin 28 vcc on bq24780s it's should be 18v to 20v
if not there is a diode and a resostor from main line the resistor mostly value are 10 to 20 ohms!

Not solve yet due for searching another ec firmware, bq24780s has the 19v on pin 28 and
ACDET -> HIGHT
ACOK -> LOW
REGN -> 6 V
BTST -> 5.7 V
CMPIN and CMPOUT -> 0.5 V

Is missing ACOK: from datasheet:
"Active HIGH AC adapter detection open drain output. It is pulled HIGH to external pullup supply rail by external
pullup resistor when a valid adapter is present (ACDET above 2.4 V, VCC above UVLO but below ACOV and
VCC above BAT). If any of the above conditions is not valid, ACOK is pulled LOW by internal MOSFET. Connect
a 10-kΩ pullup resistor from ACOK to the pullup supply rail."

[brew99]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

As you say, the ACOK needs to be HIGH. Did you try changing the BQ chip? Without the ACOK being HIGH, you most likely won't get the gate signal to the ACFET

[mcplslg123]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

ACOK signal ineeded is the issue. Kbc can be the issue as its related to kbc_aux power (eg dell cedar 13269 mb) though its very difficult to arrive at any conclusion without schematic.

[jasko_jacker]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

I replaced the EC but 3.3 power voltage disappears when this ic is in place, if I remove it the 3.3 v appears, but the new ic as the old don't show with multimeter any sign of short. I don't remember if the presence of 5v ALW is related to EC, but I don't detected 5v ALW . someone can identify the 3.3 / 5 ALW ic to search the datasheet. thanks

[mcplslg123]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

Awv = sy8286brac
BAC=SY8288CRAC

[mcplslg123]

Re: Lenovo Air 14IKBR EYG20 EYG10 NM-B601 charge problem

You can refer to Quanta G71 schematic.