Xuanlong destroyer cw65l003 laptop does not display maintenance after startup

The cw65l003 laptop of Xuanlong destroyer doesn’t show when it is turned on, and no trace of corrode is found in the water, so it should be repaired according to switch;When rsmret ා, it is found that there is no VCC, replace u42, start test,Normally booting up!

[machine model] Xuanlong destroyer cw65l003 notebook

[mainboard version] 6-71-w65k0-d03

[fault phenomenon] the laptop does not display when it is turned on

[maintenance process]

Received a Xuanlong destroyer cw65l003 fault machine, the customer described that the laptop does not display when it is turned on, but in fact there is no switch, there is no current when the laptop is turned on, only the indicator light changes from orange to green.

Remove the machine, found no traces of immersion corrode, then repair according to switch.All the five conditions for power on, PWR_BTN has been issued, indicating that EC has been working normally, which can only be the condition of South Bridge.

Cwl651 does not power on

It was chananqiao,VCC, RTC. When rsmret ා, it was found that there was no VCC, and the normal value was 3V or so.

Show dragon destroyer cw65l003 laptop boot does not display maintenance Figure 2

Xuanlong destroyer cw65l003 laptop boot does not display maintenance Figure 3

Xuanlong destroyer cw65l003 laptop does not display maintenance Figure 4

炫龙毁灭者CW65L003笔记本开机不显示维修图5

Xuanlong destroyer cw65l003 laptop boot does not display maintenance Figure 5

Measure the 4 pin Diode value is normal of u42, connect 2-4 pin with tweezers, press to start, the current comes up, indicating that the problem has been found.

Xuanlong destroyer cw65l003 laptop does not display maintenance Figure 6