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Gigabyte GA-X58A-UD3R mainboard does not start for repair
3VDUAL also supplied power to U49 chip, and it was found that there was something wrong with the pin position of U49, and 48 and 49 pins were connected together.
Motherboard model: Gigabyte GA-X58A-UD3R 2.0
Fault symptom: the motherboard does not boot.
Maintenance process:
Gigabyte GA-X58A-UD3R motherboard, the failure is that the motherboard does not boot.
Gigabyte GA-X58A-UD3R mainboard maintenance without starting Figure 1
Xinzhi made a circuit diagram.
Gigabyte GA-X58A-UD3R mainboard maintenance without starting Figure 2
Gigabyte GA-X58A-UD3R mainboard maintenance without starting Figure 3
The test found that pin 3 of Q36 was short-circuited to the ground, and the fault remained after removal. Q36 on the drawing, it is 5VDUAI to 3VDUAL. Search for 3VDUAL on the drawing. Pay attention to distinguish between 3VDUAL and 3VDUAL-PCH and 3VDUAL-USB3.
Focus on finding 3VDUAL for power supply.
Focus on finding the power supply of the network card chip, and the fault remains after removing the network card and filter capacitor.
On the drawing, there is also a rich capacitor at the interface of the network cable, and D3 is not short-circuited.
Look at the drawings carefully.
3VDUAL also supplied power to U49 chip, and it was found that there was something wrong with the pin position of U49, and 48 and 49 pins were connected together.
This chip was crushed, U49 short-circuited 3VDUAL to ground, and repaired it with oil and tin. All the voltages are normal at power-on. Connect the monitor, power-on and start-up are normal. Troubleshooting and maintenance are over.
