Hi,
I have a Lenovo G505s that currently won't start, I believe that it is a power circuitry issue, however I am not 100% sure.
Initially the unit would boot but not charge the battery, despite the battery maintaining a charge, and the laptop would not run off the battery. This led me to believe that the MOSFET PQ302 was not working, hence I replaced it. This rendered useless, and shortly thereafter, I was recommended to heat the area to ensure there are no solder cracks. I heated both sides of the board in the area containing the power circuitry only. After this, the board seemed to have failed as there are no led lights and it won't boot.
I tested the voltage input, at 20v and the same voltage on PQ301 (pins 8 and 1) and PQ302 (pins 8 and 1).
Here is the service manual (battery circuitry is on page 48): https://drive.google.com/file/d/0BwBeBHAY_5iFSFZPUXpDekNZQlU/view?usp=sharing
I am not sure what to do next.
I have a Lenovo G505s that currently won't start, I believe that it is a power circuitry issue, however I am not 100% sure.
Initially the unit would boot but not charge the battery, despite the battery maintaining a charge, and the laptop would not run off the battery. This led me to believe that the MOSFET PQ302 was not working, hence I replaced it. This rendered useless, and shortly thereafter, I was recommended to heat the area to ensure there are no solder cracks. I heated both sides of the board in the area containing the power circuitry only. After this, the board seemed to have failed as there are no led lights and it won't boot.
I tested the voltage input, at 20v and the same voltage on PQ301 (pins 8 and 1) and PQ302 (pins 8 and 1).
Here is the service manual (battery circuitry is on page 48): https://drive.google.com/file/d/0BwBeBHAY_5iFSFZPUXpDekNZQlU/view?usp=sharing
I am not sure what to do next.