Xuanlong notebook no booting repair

Main board model: Xuanlong Duxian DALG9CMB6E0_REV:E no booting.

Malfunction: Notebook no booting

Maintenance process:

I received a dazzling laptop, notebook no booting, powered on 0.26A stop at Fixed current instead of booting up. CPU is the seventh generation single CPU of Intel. Disassemble the machine and test VCC. Except VCCSA and CPU VCC, there are VCC.

Xuanlong Notebook no booting repair Figure 1.

Measure the PWRGD signal, HWPG has it, H_VCCST_PWRGD has it, and VRON has it. After NCP81218 gets VRON, VCCSA VCC will be generated. It is judged that NCP81218 is broken or VCCSA VCC is out of order.

Xuanlong Notebook no booting repair Figure 2.

NCP81208 chip substitution was found on Intel 6th generation Parts motherboard, and it was replaced directly. After replacing VCCSA VCC, it was produced.