Laptop chip level service training course means complete motherboard circuit tracing through schematics, ball grid ic reballing and placing through bga machine, when bios corrupted , bios programmer is used to flash bios chip and reprogrammed ic . serial clock and serial data checking , charging performance of battery , through digital storage oscilloscope, clk and data measuring, motherboard burned, track checking and jumper connectivity, full short main voltage (19.5v), tracking charging ic circuit, power ic ldo voltage (3.3vl and 5vl), rtc section voltage double diode checking and rtc battery 3v and rtcrst clear through jumper.