Received a repair under county G470 lenovo laptop, press the power button have no reaction, adjustable power supply and no current display, and teardown detection

Take out the motherboard clearly see insulating paper burn out

Rip insulating paper, see the following original into liquid corrosion seriously

The next clean corrosion, replace the corrosion to burn off the original,

Measuring the mainboard no short circuit, and continue to electrify test, there is no standby current, then can only carefully measured, then to step by step, starting power supply mouth first, followed by PF101 insurance, has been burned, and has no short circuit, measuring a heap of solder to solve directly,

Energized again test, the machine needs to be mechanical and electrical flow, can also be triggered, display light machine directly

Installed test machine OK, perfect repair machine