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 Figure 1.

2.GPU_VDDC=1.6Ω

ASUS EAH6770 graphics card does not display repair Figure 2.

3.MVDD=305Ω.

ASUS eah6770 graphics card does not display maintenance Figure 3.

4.LOD1_1.8V=1.3KΩ.

ASUS EAH6770 graphics card does not display repair Figure 4.

1. LOD2_1.01V=187Ω.
   

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.

ASUS EAH6770 graphics card does not display repair Figure 6.

2.GPU_VDDC=1.05V.

ASUS EAH6770 graphics card does not display repair Figure 7.

3.MVDD=1.6V.

ASUS EAH6770 graphics card does not display repair figure 8.

4.LOD1_1.8V=1.8V.

ASUS EAH6770 graphics card does not display repair Figure 9.

5.LOD2_1.01V=1.0V.

ASUS EAH6770 graphics card does not display repair Figure 10.

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

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.

ASUS EAH6770 graphics card does not display repair Figure 12.

pin un the pin gold line from pinGate circuit.

ASUS EAH6770 graphics card does not display repair Figure 13.

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

ASUS EAH6770 graphics card does not display repair Figure 14.