SVC-19A · Question #47
Which two components inside an iMac are energized if the computer is plugged in, even when the computer is turned off? (Select two.)
The correct answer is E. Power supply F. LCD. Even when an iMac is shut down, the power supply (E) must remain partially energized to detect a power-on signal and provide standby voltage to the system - it is always "listening" as long as AC power is connected. The LCD (F) retains power because its high-voltage backlight…
Question
Which two components inside an iMac are energized if the computer is plugged in, even when the computer is turned off? (Select two.)
Options
- ALogic board
- BHard drive
- CMemory
- DSpeakers
- EPower supply
- FLCD
How the community answered
(27 responses)- A4% (1)
- B4% (1)
- C7% (2)
- E85% (23)
Explanation
Even when an iMac is shut down, the power supply (E) must remain partially energized to detect a power-on signal and provide standby voltage to the system - it is always "listening" as long as AC power is connected. The LCD (F) retains power because its high-voltage backlight inverter circuit stays live, which is a key safety hazard technicians must respect before opening the display assembly.
The remaining options are incorrect because the logic board, hard drive, memory, and speakers only receive power after the power supply fully activates in response to a power-on event - they are completely de-energized in standby.
Memory tip: Think "Plugged in = Power supply + Lit screen (LCD)." Both are tied to the physical act of connecting to the wall - one converts AC power, the other uses it to keep the display circuit ready.
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