An IT technician is troubleshooting a corporate laptop whose screen remains completely black when powered on, although the power indicator light is illuminated and cooling fans are running. To help establish a theory of probable cause regarding the display issue, which of the following actions should the technician perform? (Select TWO.)
- Connect an external display monitor to the laptop to check if video output is functioning.Cevap
- Shine a bright light at an angle onto the screen to check if faint image outlines are visible.Cevap
- CReplace the high-voltage fluorescent inverter board on the modern display panel.
- DOrder and install a replacement motherboard immediately before testing any individual display components.
Cevap
The technician should connect an external monitor to verify GPU video output and shine a bright light onto the display panel to check for a faint image indicating a backlight failure.
Testing with an external monitor determines if the GPU outputs video, while shining a light on the panel checks whether the LCD is active without backlighting. Both steps help establish a theory of probable cause without making premature hardware replacements.
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Establishing a Theory of Probable Cause in Troubleshooting Methodology