Acer A315-55G notebook maintenance without CPU power supply.

The resistance of the next 13 pins to the ground is analyzed, and it is found that the short circuit to the ground is 0. Remove the capacitor PC7026 and measure it, and it is found to be a short circuit. Find a 10 Ω resistor and capacitor from the material plate, and measure the resistance of this pin to ground to return to normal.

Machine model: Acer A315-55G

Main board number: DA0ZAWMB8E0 REV: E

Fault symptom: the notebook has no CPU power supply.

Maintenance process:

First of all, the macro interface of this small interface also has an ADP_ID, which is connected with a voltage of 19V, but it is protected and isolated. Only by inserting the original adapter can the 6-pin ACDET of the charging chip be divided and a common point be generated. In the future, everyone will pay attention to it. Of course, this is my first time, and I may have little knowledge. Because of this, I picked up a leak, and when I went home, I blindly repaired and protected this piece. As shown in the figure, we can know that:

Acer A315-55G notebook maintenance without CPU power Figure 1

Acer A315-55G notebook maintenance without CPU power Figure 2

Acer A315-55G notebook maintenance without CPU power Figure 3

Plug in the adapter, turn it on, you can turn it on, and the screen is not displayed. Test memory power supply 1.2V is normal. 1.05V is normal, and there is no CPU power supply and single display power supply. Then fix the CPU power supply first. Touching the chip with your hand is a little hot. Open drawings and points. Measuring chip conditions. 12 feet VIN feet, normal. 13 pin VCC 0V, abnormal. The resistance to ground of the lower 13 pins was measured, and it was found that the short circuit to ground was 0.

Acer A315-55G notebook maintenance without CPU power Figure 4

Acer A315-55G notebook maintenance without CPU power Figure 5

Acer A315-55G notebook maintenance without CPU power Figure 6

As can be seen from the point position, pin VCC of pin 13 is connected to resistor PR7064 and a small capacitor PC7026. These two components were found in kind, and the 10 Ω resistance was a little burnt. The capacitor PC7026 was removed and measured, and it was found to be a short circuit. Find a 10 Ω resistor and capacitor from the material plate, and measure the resistance of this pin to ground to return to normal. Plug in the adapter again and turn it on. The power supply has been normal, the connected screen has been successfully lit, and it has successfully entered the system, and it has been maintained until this end.