Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair

Machine model: Ares Z7-KP7S1 6-71-p65p0-d02a

auto power off enomenon: the fan is running wildly due to not recognizing the independent display

Maintenance process: the peer described that the fan would run wild after starting up for a while, and then auto power off would appear soon. However, the actual temperature of auto power off was not high, indicating that he was puzzled.

God of war’s first intuition, is the temperature control common failing seconds to kill?Or don’t you recognize the video card?First boot into the BIOS to see, the graphics card “n / a” empty, did not recognize the graphics card.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 1.

Only the display system.

Ares z7-kp7s1 does not recognize the independent display fan crazy turn auto power off maintenance Figure 2.

Touch the display card cooling copper tube cold, measuring display card VCC, large Inductor without VCC, dismantle the machine to repair the main board.First take a look at this graphics card VCC to the ground diode value, novice see this is not already want to give up?

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 3.

After measurement,Inductor Pl1 1v8 on the back of motherboard_Aon has 1.8V output.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 4.

The Inductor shown in the figure below does not have VCC after startup. No obvious abnormality is found in Inductor to ground diode value after power failure.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 5.

These graphics cards VCC Inductor are not VCC output, which should be repaired first?The drawings of Shenzhou are very humanized.Look at the picture. The power on sequence of VCC is given on page 113 of the drawing.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 6.

1V8_Aon output is normal, next to 1v8_Run, after measurement,VCC was not opened normally. I was dazzled by the opening of this stack gate circuit. I was directly measured from the first u41.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 7.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair figure 8.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 9.

1 pin 1.8V or so is normal.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 10.

pin 5 was normal.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 11.

4 pin output 0.862v abnormal, great joy!

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 12.

Power off test 4 pin to ground value 0.023, is it low?

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 13.

4 pin GFX_On does not even have many places, start with the simplest.Remove u41 and measure 4 pin to ground value 536, OK, it is the problem of u41!It should be caused by dust deposition near the fan port. The starting current is different after replacing u41.At this time, the hand touch graphics card has been high temperature.

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 14.

Simple assembly test, BIOS has recognized the unique!

Ares Z7-KP7S1 notebook cannot recognize independent graphics card repair Figure 15.

After the installation test, it was found that the CPU fan was running very badly. Master Lu saw that the CPU was kept at 90 degrees,or so, and removed the machine again to clean the dust. The maintenance was finished.