Acer V5-473 DAZRQMB18F0 w/ missing +5V_S5
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?
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Seasoned repair technicians started from very little knowledge and evolved into what they are now. If you are planning to take this path as a part-time or full-time profession, there are few things that you need to keep in mind to get you started on the journey towards becoming a successful laptop repair technician.