220-1002 · Question #379
Which of the following are typically too dangerous to be disassembled by an in-house technician? (Choose two.)
The correct answer is B. Power supply D. CRT monitor. Power supplies (B) contain large capacitors that can store lethal electrical charges (hundreds of volts) even after being unplugged from the wall. They should never be opened by field technicians - they are considered sealed, no-user-serviceable-parts units. CRT (Cathode Ray…
Question
Which of the following are typically too dangerous to be disassembled by an in-house technician? (Choose two.)
Options
- ALCD monitor
- BPower supply
- CLaptop screen
- DCRT monitor
- EMotherboard
- FTablet
How the community answered
(60 responses)- A2% (1)
- B90% (54)
- C2% (1)
- E7% (4)
Explanation
Power supplies (B) contain large capacitors that can store lethal electrical charges (hundreds of volts) even after being unplugged from the wall. They should never be opened by field technicians - they are considered sealed, no-user-serviceable-parts units. CRT (Cathode Ray Tube) monitors (D) are the other high-danger item: the flyback transformer and picture tube can store extremely high voltages - typically 25,000 to 35,000 volts - in their capacitors long after power is disconnected. This stored charge can cause fatal electrocution. LCD monitors use low-voltage backlights (though older CCFL models have some risk), laptop screens are relatively safe, motherboards carry no residual high-voltage charge, and tablets present only battery-related risks. CRTs and power supplies are the two standard 'do not open' items in A+ training.
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