Lenovo IdeaPad MIIX 700-12ISK Tablet Can't boot repair

Lenovo IdeaPad MIIX 700-12ISK Tablet Can’t boot repair

Machine model: Lenovo IdeaPad Miix 700-12ISK

Symptoms: Tablet Won’t Turn On

Lenovo IdeaPad MIIX 700-12ISK Tablet Can’t boot repair Figure 1.

Lenovo IdeaPad MIIX 700-12ISK Tablet Can’t boot repai rFigure 2.

Maintenance process: After disassembly, first check that there is no trace of water damage bump maintenance, etc. According to large current maintenance idea,schematic is basically not needed.Inductor with a large quantity of multimeter found that there was no Short circuit in diode value. At this time, the problem was already obvious.

Directly measure the isolation of 19V Current protection, and find that 19V Fuse is grounded. The removal amount of the upper pipe connected to it is Short circuit, which seems to be the problem. For the sake of Fuse, the diode value of the lower motherboard was measured, and it was found that Short circuit still existed. Generally,Short circuit would appear in the later stage of the motherboard with tubes burned.

It was found that the diode of the later stage was also Short circuit. After removing the diode, the motherboard diode value returned to normal. There just happened to be Parts motherboard on hand to replace it, and booting up directly. The previous MOSFET Short circuit could not determine the channel, and the good board measurement was P channel.

Lenovo IdeaPad MIIX 700-12ISK Tablet Can’t boot repair Figure 3.

Lenovo IdeaPad MIIX 700-12ISK Tablet Can’t boot repair Figure 4.

Lenovo IdeaPad MIIX 700-12ISK Tablet Can’t boot repair Figure 5.

Summary: The idea of maintenance without power-on is actually very simple, nothing more than Short circuit,water damage and the like, lacking standby conditions, while Short circuit is the easiest to master, and basically it doesn’t need schematic, so you can find the problem directly with multimeter(PS: you can also burn it with Short circuit Dafa, touch it with your hands, of course, don’t burn it.