Lenovo Xiaoxin 15 2019 notebook no booting mainboard burn out maintenance

Lenovo Xiaoxin 15 2019 notebook no booting mainboard burn out maintenance

The computer does not turn on, and the motherboard is burnt out. Open the back of the motherboard, find the corresponding drawing of the machine on Xin manufacturing software, and directly find the burned place. There is no short circuit in the 8-pin and 9-pin test of U10. Connect the power on cable and screen cable, and repair the fault when the machine is on.

Machine model: Lenovo Xiaoxin 15 2019

Plate No.: la-h101p

Fault: computer no booting, the motherboard burned a hole, but did not burn through

Maintenance process: received a colleague’s Lenovo Xiaoxin 15-2019, the colleague described that a hole was burned, but it was not burned through

Lenovo Xiaoxin 15 2019 notebook no booting mainboard burn out maintenance Figure 1

Lenovo Xiaoxin 15 2019 notebook no booting mainboard burn out maintenance Figure 2

After opening, it is found that both sides of the chip connection are burnt out, and the copper sheets of the chips pin and PAD are burnt out. Check the ground value of all Inductor and the common point to ground value of the burned out motherboard. It is found that there is nothing abnormal, so start to look for information to repair.

Maintenance of Lenovo’s new no booting motherboard

Open the back of the motherboard, the board number is la-h101p, open the Xin manufacturing software, find the corresponding drawing of the machine, and directly find the burned place pu402, as shown in the figure:

Lenovo Xiaoxin 15 2019 notebook no booting mainboard burn out maintenance Figure 4

Because this was scratched by peers, the naked eye can’t see which is an pin. Then compare the pin bits one by one. Finally, it is determined that the common point VCC of 2 to 5 pin of 5V VCC chip is burned, so the scraping layer by layer, and then make insulation.

Lenovo Xiaoxin 15 2019 notebook no booting mainboard burn out maintenance Figure 5

Lenovo Xiaoxin 15 2019 notebook no booting mainboard burn out maintenance Figure 6

After insulation test, open the drawing to find Level 2 5V, as shown in the figure

Lenovo Xiaoxin 15 2019 notebook no booting mainboard burn out repair t figure 7

There is no Short circuit in 8 pin and 9 pin of U10. Connect FPC and screen cable, then press Switch and booting up, and repair the fault.

Lenovo Xiaoxin 15 2019 notebook no booting mainboard burn out maintenance figure 8