Dell 14236-1 notebook cannot be turn on for repair

Dell 14236-1 notebook cannot be turn on for repair

Machine model: Dell 14236-1

Fault phenomenon: notebook Won’t Turn On

Maintenance process: after inspection, 13.6v of common point is normal, 3 / 5V of standby is normal.

Dell 14236-1 notebook cannot be turn on for repair Figure 1.

Switch the normal drawings of c1080v, dc30v, dc30v,EN, dc30v, dc30v, dc30v, dc30v, dc30v, dc30v, c10v, dc30v, c10v, dc30v, dc30v, dc30v, dc30v, dc30v, dc30v, dc30v, dc30v, dc30v, dc30v, dc30v, dc30v, dc30.Forum has a brush BIOS switch, the premise is that BIOS VCC read VCC are normal.

But my board is not normal. It will be 0.4V and 0.8V. It must be normal standby. Then BIOS VCC is not normal.Short circuit is not converting VCC.

Dell 14236-1 notebook cannot be turn on for repair Figure 2.

In the figure, the u4101 secondary VCC chip is not installed, but a 0 ohm resistance straight through is used, and an Inductor is directly soldered.

Dell 14236-1 notebook cannot be turn on for repair Figure 3.

Without careful observation, it can not be seen that booting up is successful in the test.

Dell 14236-1 notebook cannot be turn on for repair Figure 4.