1. First, gently shake the power connector or battery to check whether it is in good contact. If it is abnormal, try to reinstall the power adapter or battery. The possible problems are the deformation of the power connector or the decrease of the elasticity of the battery contact.
2. If the power supply or battery connector is good, use a multimeter to measure the output voltage of the power adapter or battery, mainly to check whether the output voltage is stable and whether the actual output voltage value is consistent with the nominal voltage of the power supply. If the output is unstable or the actual output voltage is significantly different from the nominal voltage of the product, replace the damaged power adapter or battery.
3. If the above detection steps are normal, it can be inferred that the problem is on the laptop power board or motherboard. Here, open the laptop shell and check whether the power board and motherboard are in good contact.
4. If the power board and battery are in good contact, check whether the power board is normal with the replacement method commonly used by DIY. If not, replace it.
5. If the power board and battery are confirmed to be normal through the above methods, it can be inferred that the notebook motherboard or other main components are damaged (such as the boot circuit problem). At this time, the motherboard can be repaired or replaced.
