Let's suppose you are troubleshooting an Acer V5-473 w/ board code DAZRQMB18F0 and the voltage measurements are as follows:
This circuit design is found in many laptops and knowing how to troubleshoot them would enhance your capability to fix many laptop problems such as no-power, auto-off and no display problem.
Voltage measurements were done after pressing the power button. Can you analyze the circuit answer the following questions?
- Based on the above voltage measurements, which component(s) do you think is the potential faulty component? Why?
- Let's assume that all voltage rails are normal but PR118 is open, what voltage can we measure at +5V_S5? Why?
- Let's assume that all voltage rails are normal but the drain-source pin of PQ22 is shorted. What voltage can you measure at +5V_S5? What will happen?
