Repair of Raytheon 911 notebook water inlet motherboard with short circuit and no power supply.

Visually, there is no corrosion where there is water. When the current is turned on, it is found that there is no current for a while, and it is concluded that there is a short circuit. When I opened the drawing, I found that the 8690 pipe PU21 and the PU23 pipe were passages. I directly removed the hot short-circuit pipe PU21 and re-burned the machine, and it was normal.

Machine model: Raytheon 911 notebook

Main board number: 6-71-NH5D0-D02 i5

Fault symptom: the notebook water inlet motherboard is short-circuited and not energized.

Maintenance process:

A Raytheon 911 notebook computer, the fault is that the water inlet motherboard is short-circuited and not electrified.

Raytheon 911 notebook water inlet motherboard short circuit without power maintenance Figure 1

Disassemble the machine, and visually observe that there is no corrosion where there is water. When electricity is turned on, it is found that there is no current for a while, so it can be concluded that there is definitely a short circuit behind it.

The machine was burned with 3V, and the current immediately went up to 5A. I found a chip hot by touching the whole board with my hand.

Raytheon 911 notebook water inlet motherboard short circuit without power maintenance Figure 2

When I opened the drawing, I found that the 8690 pipe PU21 and the PU23 pipe were passages. I directly removed the hot short-circuit pipe PU21 and re-burned the machine, and it was normal.

Raytheon 911 notebook water inlet motherboard short circuit without power maintenance Figure 3

Raytheon 911 notebook water inlet motherboard short circuit without power maintenance Figure 4

Replace the PU21 tube, turn the voltage back to 20V for power-on, the standby current is normal, 0.007 triggers the startup to be normal, all functions are normal, troubleshooting and maintenance are over.

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