Computer power failure test
A colleague's computer cannot start (Lenovo Qitian) and the warranty has expired. When I press the power button, the LED on the button flashes occasionally, but the brightness is very low. Checked the panel wiring and found no problem.
Remove the power supply and motherboard connector.
Short the green and black wires
The fan rotates once and then stops. It was determined to be a power supply problem.
Call customer service and the total price of replacing the power supply will be around 450.
Check the power supply price on Taobao for 40-65.
Then remove the power supply from the old computer.
Short the green and black wires again and the power comes on.
After the installation is complete, the computer lights up.
pull
General:
If the computer cannot light up or the fan does not spin, it may be due to a power supply problem.
Computer power supply and refrigerator compressor controller failure, usually caused by capacitor damage.
When electronic products such as electronic keyboards malfunction, the power device (power amplifier chip) is usually burned out.