ASUS EAH6770 graphics card does not display repair

ASUS EAH6770 graphics card does not display repair

machine model: ASUS EAH6770

fault phenomenon: the display card does not display

maintenance process: after getting the video card, type diode value first. Several groups of VCC of a card and N card are slightly different. Let’s talk about the groups:

1.5V_VDD=3.8KΩ.
ASUS EAH6770 graphics card does not display repair

ASUS EAH6770 graphics card does not display repair Figure 1.

2.GPU_VDDC=1.6Ω
ASUS EAH6770 graphics card does not display repair

ASUS EAH6770 graphics card does not display repair Figure 2.

3.MVDD=305Ω.
ASUS EAH6770 graphics card does not display repair

ASUS eah6770 graphics card does not display maintenance Figure 3.

4.LOD1_1.8V=1.3KΩ.
223;4

ASUS EAH6770 graphics card does not display repair Figure 4.

  1. LOD2_1.01V=187Ω.
    263;5

ASUS EAH6770 graphics card does not display repair Figure 5.

Just now these groups of diode value are basically normal, and then test several groups of VCC;
1.5V_VDD=5.1V.
325;6

ASUS EAH6770 graphics card does not display repair Figure 6.

2.GPU_VDDC=1.05V.
366;7

ASUS EAH6770 graphics card does not display repair Figure 7.

3.MVDD=1.6V.
402;8

ASUS EAH6770 graphics card does not display repair figure 8.

4.LOD1_1.8V=1.8V.
443;9

ASUS EAH6770 graphics card does not display repair Figure 9.

5.LOD2_1.01V=1.0V.
485;10

ASUS EAH6770 graphics card does not display repair Figure 10.

VCC was normal in 5 groups, and CLK and 26m were also normal.
533;11

ASUS EAH6770 graphics card does not display repair Figure 11.

Then test the reset signal. The BIOS 1 pin directly tested here does not have CS chip selection signal when pressing the reset key.
598;12

ASUS EAH6770 graphics card does not display repair Figure 12.

pin un the pin gold line from pinGate circuit.
741;13

ASUS EAH6770 graphics card does not display repair Figure 13.

2 pin is PCI-E a11,pin input waveform is normal, maintenance is over.

795;14

ASUS EAH6770 graphics card does not display repair Figure 14.