Lenovo G50-80 i think Have no power...

[lorins_core]

Have a Nice to all

I have Lenovo G50-80
Mobo pn: Aclu3/Aclu4 NM-A361

*Laptop Unit Status: if you plug the Charger Adapter. indicating power on status Light. i press the power Switch long Turn of then on the Light Again.

*Before the unit before came in my technical Area. i pressing the power button unit turn on then light on indicator after 3 or 5 sec turn off?

I decide dismantle the laptop unit. inspected first Check for water spilled negative on corroded mobo is clean. check the voltage from dc in. 20.2V.
to fuse 20.3 on all rail.

check on PQ301
123 - 20.3V
4 - 5V? i i have question for this. it is Voltage Drop?
5678 - 20.3V
I check the Mosfet. Mosfet is Good

check on PQ302
123 - 20.3V
4 - 5V
5678 - 20.2V
Also This Mosfet is Good


check ic - PU301
1. 20.3V
2. 20.3V
3. 0V
4. 1.6V
5. 0V
6. 2.6V
7. 0V
8. 3.3V
9. 3.3V
10. 00.8V
11. 1.5V
12. 1.8V
13. 1.8V
14. 0V
15. 0V
16. 5.9V
17. 5.8V
18. 1.8V
19. 1.8V
20. 20.3V

try to change this IC. same Prod Code BQ737
Same. Problem nothing Happen

then i Check
PQ303
123 - 20.3V
4 - 20.1V
5678 -1.8V


other i Check the Always... 3.3VALW & 5VALW.

Which parts are Faulty?

Need to your Advice.
TIA.

[Techtiger]

Re: Lenovo G50-80 i think Have no power...

Have a Nice to all

I have Lenovo G50-80
Mobo pn: Aclu3/Aclu4 NM-A361

*Laptop Unit Status: if you plug the Charger Adapter. indicating power on status Light. i press the power Switch long Turn of then on the Light Again.

*Before the unit before came in my technical Area. i pressing the power button unit turn on then light on indicator after 3 or 5 sec turn off?

I decide dismantle the laptop unit. inspected first Check for water spilled negative on corroded mobo is clean. check the voltage from dc in. 20.2V.
to fuse 20.3 on all rail.

check on PQ301
123 - 20.3V
4 - 5V? i i have question for this. it is Voltage Drop?
5678 - 20.3V
I check the Mosfet. Mosfet is Good

check on PQ302
123 - 20.3V
4 - 5V
5678 - 20.2V
Also This Mosfet is Good

First 2 Fets are good pin 4- 5V is the gate pass to bypass Voltage it's a P-Channel fet

[Techtiger]

Re: Lenovo G50-80 i think Have no power...

PU301 pin 5 ACOK voltage is not correct 3.3V SIO is not detecting presence of ACOK signal trace it back test pic all components

[ktmmotocross]

Re: Lenovo G50-80 i think Have no power...

as first flash bios. this model was well know for this fault

[lorins_core]

Re: Lenovo G50-80 i think Have no power...

as first flash bios. this model was well know for this fault

i Flash the bios. still same problem.

I confuse why if i Plug the charger adapter automatic the light indicator has been light up? also i observe the battery pack installed 2 indicator light up and why not showing the orange light? only 2 white led only.

[lorins_core]

Re: Lenovo G50-80 i think Have no power...

PU301 pin 5 ACOK voltage is not correct 3.3V SIO is not detecting presence of ACOK signal trace it back test pic all components

thanks you. I will try Later