220-801 · Question #103
A technician just finished replacing a laptop screen, and upon first boot notices that the screen provides a very faint but darkened image which cannot be adjusted. Which of the following was MOST…
The correct answer is C. Inverter. The inverter is a component in older CCFL-backlit LCD screens that converts DC power from the motherboard into the high-voltage AC power needed to illuminate the CCFL backlight tube. If the inverter is left unplugged, the backlight will not function, resulting in a very faint…
Question
A technician just finished replacing a laptop screen, and upon first boot notices that the screen provides a very faint but darkened image which cannot be adjusted. Which of the following was MOST likely left unplugged after replacement?
Options
- ACMOS Battery
- BMini-PCI Card
- CInverter
- DDC Cord
How the community answered
(41 responses)- A20% (8)
- B10% (4)
- C66% (27)
- D5% (2)
Explanation
The inverter is a component in older CCFL-backlit LCD screens that converts DC power from the motherboard into the high-voltage AC power needed to illuminate the CCFL backlight tube. If the inverter is left unplugged, the backlight will not function, resulting in a very faint, nearly invisible image that is only visible when viewed under bright ambient light. The image appears because the LCD panel itself still receives signal, but there is no backlight to illuminate it. The CMOS battery stores BIOS settings, a Mini-PCI card handles wireless, and a DC cord powers the laptop - none would produce this specific symptom.
Topics
Community Discussion
No community discussion yet for this question.