When we connect the adapter to the laptop motherboard current flow via two MOSFET and current sensing resister from the battery charging section and is then given to a different buck converter. Sometimes any ceramic capacitor, MOSFET, or chip gets short to the group and adapter voltage gets loaded such a problem is called a short circuit. We will see how to solve short circuit problem.
We have to use DC regulated power supply to solve this problem. Keep something 18 volts then connect DC power supply and observe which components getting very hot and then replace that component. Do keep one thing in mind that keep the black probe connected to the ground.
Then connect red prob to Current Sensing Resister in respective laptop schematic.
DC Power Supply To Solve Short Circuit Problem
30 volt 5 amp DC power supply is very important to repair laptop motherboard. Some common use are as follows:
Uses
- we can use it as a universal Adapter
- we can use it to remove short circuits in the motherboard
- Another important use of the DC power supply is with help of the current meter which is on the left side we can diagnose or judge problems in the motherboard.
Current Chart For Different Motherboards Generations
Below is the current chart for different motherboards AMD and Intel generations:
| CPU | Core 2 duo | Core i3 1st and 2nd generation | Core i3 3rd and 4th generation | Core 1st, 3rd, 5th, and 6th generation |
|---|---|---|---|---|
| Power stuck in VIN section | 0.000 | 0.000 | 0.000 | 0.000 |
| 3.3volt generate and SIO got power | 0.005 to 0.020 | 0.005 to 0.020 | 0.005 to 0.020 | 0.005 to 0.020 |
| Power button press 3.3vsus, 5vsus, 1.8v, 1.05v generate | 0.150 to 0.350 | 0.150 to 0.200 | 0.100 to 0.150 | 0.60 to 0.150 |
| Cpu core voltage | 0.600 to 0.800 | 0.550 to 0.700 | 0.450 to 0.550 | 0.300 to 0.350 |
| Cpu reset and BIOS start in operation | 0.800 to 1.000 | 0.700 to 0.850 | 0.550 to 0.650 | 0.350 to 0.450 |
| Display started | Above 1.000 | Above 0.800 | Above 0.650 | Above 0.350 |
For troubleshooting problems in the laptop motherboard short circuit, you must have knowledge about laptop motherboards.
Thank you for your visit!