Dell 5370 Laptop Motherboard Short-Circuited & Burnt Did Not Power On

 Laptop Model – Dell 5370

Fault – Short Circuit & Burnt

Repair Process :

    The Dell 5370  Laptop had a burning smell. When I disassembled it and compared it with the drawings, I found that 1VSB was short-circuited to ground and the integrated MOSFET chip was burnt.

    The charging inductor below was also mushy, but after testing the charging circuit, there was no problem, so I found a 2.2UH inductor and replaced it.

After removing the chip, the solder pads are also useless. I pried the inductor to find that the front stage is short. I hope the rear stage will be fine. When the scraping is not short enough, there is already a big pit, and the chip cannot be soldered back. 

If there is a material board, I can cut the board and fly the wires, and move the flowers and wood, which saves time and effort, but I have no choice but to try to fly the wires directly from the chip.
  

The chip arrived. At first I wanted to fly this end of the chip first and then put it on the other end, but the green oil was not fixed firmly and the soldering iron came off when I touched it. I turned the chip over and found an open space to fix it with glue. At once, start flying lines one by one.

For safety reasons, thick wires are used for power supply grounding and output, and thin wires are used for other signals. Mirror the flying wire. After flying the wire, measure whether each pin is connected and apply green oil.

I measured the inductor-to-ground value to be normal, then connected the power to the machine and the current jumped, and the screen came on.

At this point, the repair was completed, and hot melt glue was applied to the piece to be on the safe side.

It only took a few minutes to treat the burnt area, but three hours to live under the microscope.

Happy Repairing !!