Shenzhou ares Z7-CT7NA notebook does not recognize independent repair

Model: Shenzhou Ares Z7-CT7NA

Main board version number: 6-71-NH500-D02B

Fault phenomenon: the notebook does not recognize the unique display, and the fan turns wildly and loses power.

Maintenance process:

A Shenzhou Ares Z7-CT7NA notebook, the fault is that the notebook doesn’t recognize the unique display, and the fan will turn wildly and lose power.
Disassemble the machine and measure the ground value of the graphics card 001, which is very low. Starting with VCC, the VCC is not displayed in the power-on measurement. When checking the drawings, it is found that U5 controls the display card VCC to turn on. When VCC is pressed, it is found that there is V VCC, and it immediately falls off. At this time, the display card VCC is also absent.
The VCC 8694 composite pipe is replaced, but there is still no video card VCC, and the MP2884A VCC chip can’t be replaced. In order to confirm whether the graphics card body is damaged, the same model of VCC chip and VCC chip was found around the graphics card. After power-on,VCC actually came out, and the swap test of the two chips still failed. At this time,VCC chip is gone, so change it back. The memory VCC is available again. Finally, the 1 pin and 3 pin and 7 pin of U5 are connected.

Shenzhou ares Z7-CT7NA notebook does not recognize independent repair Figure 1.

Find a thick line of VCC and pull it to the video card.

Shenzhou ares Z7-CT7NA notebook does not recognize independent repair Figure 2.

When I entered the system, I found that I recognized the video card, and it kept powering up. The video card itself was not broken, but it crashed when I ran,VCC unstable.

Shenzhou ares Z7-CT7NA notebook does not recognize independent repair Figure 3.

I tried my best to change a small board and found a circuit similar to VCC.

Shenzhou ares Z7-CT7NA notebook does not recognize independent repair Figure 4.

Find two drawings of Dell LA-F611P and compare them with Jump wire.

Shenzhou ares Z7-CT7NA notebook does not recognize independent repair Figure 5.

Shenzhou ares Z7-CT7NA notebook does not recognize independent repair Figure 6.

Change the small board, measure the display card VCC:0.73V or so, start the test, and recognize that the display is independent. Everything is normal in the running test, and the fault is eliminated. The maintenance is over here.