Lenovo Y450 laptop automatic shutdown share

A Lenovo Y450 laptop, remove the battery, connect the adjustable DC power supply, the standby current is 0.059A, the value is higher than normal one, Push the power button and the current up to 0.53A, then automatic shutdown. Open the notebook, checked each inductance, find the resistance is only about 130 ohm between PL6 5VPCU and GND. The normal value should be more than 300 ohm.




There is a little short circuit, but the laptop can trigger, so solve automatic shutdown problem first. According to the previous maintenance experience, usually it is 1.8V circuit problem, this voltage is for the graphics card. So, connect power supply again to test, the 1.8V is normal when automatic shutdown. ....read more