DA0NJJMBAG0 charging light blinks

[Elecfronicsssss]

Laptop motherboard DA0NJJMBAG0

PROBLEM-WHEN I PLUG THE CHARGER WITHOUT BATTERY THE CHARGING LIGHT BLINKS AND WHEN I PRESS POWER BUTTON THE CHARGING LIGHT STOPS BLINKING AND STAYS ON BUT THE POWER LIGHT DOESNT TURN ON AND LAPTOP ALSO DOESNT TURN ON NO FAN SPINS NO KEYBOARD LIGHT.

CHECKED- ON S5 STATE TGE LAPTOP HAS 5V ON USB 3.3V BUT I DIDNT GET 1.8VOLTS ON BIOS PIN NO 8 WHILE PLUGGED IN AND EVEN ON S5 STATE.

GUIDE ME WITH THE PROBLEM..

SUMMARY-
1.NO 1.8VOLTS ON BIOS PIN NO 8.
2.S5 STATE ((PRESSING POWER BUTTON)))VOLTAGES ARE PRESENT LIKE 3.3V,5V.

[questore]

Laptop motherboard DA0NJJMBAG0

PROBLEM-WHEN I PLUG THE CHARGER WITHOUT BATTERY THE CHARGING LIGHT BLINKS AND WHEN I PRESS POWER BUTTON THE CHARGING LIGHT STOPS BLINKING AND STAYS ON BUT THE POWER LIGHT DOESNT TURN ON AND LAPTOP ALSO DOESNT TURN ON NO FAN SPINS NO KEYBOARD LIGHT.

CHECKED- ON S5 STATE TGE LAPTOP HAS 5V ON USB 3.3V BUT I DIDNT GET 1.8VOLTS ON BIOS PIN NO 8 WHILE PLUGGED IN AND EVEN ON S5 STATE.

GUIDE ME WITH THE PROBLEM..

SUMMARY-
1.NO 1.8VOLTS ON BIOS PIN NO 8.
2.S5 STATE ((PRESSING POWER BUTTON)))VOLTAGES ARE PRESENT LIKE 3.3V,5V.

someone correct me if im wrong but I think this modell does not have an individual CMOS battery and 3V RTC is generated from the battery itself.
That is why it wont boot up without a battery present. Charging blink usually means there is a power rail problem somewhere.
Did it worked without battery before it died?

[Elecfronicsssss]

someone correct me if im wrong but I think this modell does not have an individual CMOS battery and 3V RTC is generated from the battery itself.
That is why it wont boot up without a battery present. Charging blink usually means there is a power rail problem somewhere.
Did it worked without battery before it died?

Yes

Could anyone guide me to test power rails with the board view

Also there is no power 1.8v on bios pin no 8

[mcplslg123]

1.8V may be generated after pressing power on button.So not likely to be the issue.

need more info like what rails are present in off state. EC_RST/RSMRST#/RTCRST# etc are present or not.

[Elecfronicsssss]

1.8V may be generated after pressing power on button.So not likely to be the issue.

need more info like what rails are present in off state. EC_RST/RSMRST#/RTCRST# etc are present or not.

Dont know about much but laptop doest go to S0 state stuck at S5 state

[Elecfronicsssss]

1.8V may be generated after pressing power on button.So not likely to be the issue.

need more info like what rails are present in off state. EC_RST/RSMRST#/RTCRST# etc are present or not.

Can you guide me to test the ec rst rsmrst etc you written i can provide you the boardview

[mcplslg123]

All these signals can be measured on EC aka KBC chip. use boardview to find the exact pin number.

[Elecfronicsssss]

All these signals can be measured on EC aka KBC chip. use boardview to find the exact pin number.

Guide me from the board view..