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Dell 7472 Notebook no booting Repair
Machine model: Dell 7472
Motherboard model: LA-F251P
Malfunction: Notebook no booting
Maintenance process:
Received from Dell 7472 notebook no booting, the standby time is 0.005, and it will not be displayed after power on. Measure the common points 19V, 3V Inductor PL100 3.3V, 5V Inductor PL101 5V,BIOS Inductor is normal, and the BIOS fault remains the same.
Dell 7472 Notebook no booting Repair Figure 1.
Measure the circuit, measure EC VCC,CLK, reset,VCC 3.3V is normal,CLK is also normal. Measurement shows that EC’s 27 pin PCH_RSMRST#VCC is 0V, which is abnormal.
Dell 7472 Notebook no booting Repair Figure 2.
Replace the EC chip.
Dell 7472 Notebook no booting Repair Figure 3.
Plug-in current goes up instantly, and then measure EC’s 27 pin VCC 3.3V, standby VCC is 0.008,VCC, troubleshooting.
Dell 7472 Notebook no booting Repair Figure 4.
