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?

Common join us and let's discuss this at Leaky Mosfet Support Group.  You can also find a wide range of chips for macbooks and laptops here if you are in need of replacement chips.  If you are interested in paid support, you can also message us for inquiry.

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