HP LaserJet Enterprise M552 - Touchscreen black, white, or dim (no image)

Touchscreen black, white, or dim (no image)
Figure 2-43 Touchscreen blank, white, or dim (no image)
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Touch the display or Home button
to exit sleep mode. Make sure that
the printer is plugged in and
the power is turned on.
Black display
(no back-light
or image)
White display
(no image)
Dim display
(no image)
Is the Home button
Illuminated
(bright white)?
Open the
diagnostic function.
Does an image
appear on the
control panel?
Does the display
turn on?
Problem solved.
Are the formatter
LEDs functioning?
Turn the printer power off.
Make sure that all of the HDMI,
USB, and FFCs are fully seated
on the formatter.
Do not replace the control panel.
Turn the printer power off.
Inspect and reseat the
control panel cables.
Remove and reseat the
formatter.
Make sure that the
formatter LEDs function.
Problem fixed?
Replace the
control panel.
Turn the printer power off.
Make sure that all of the HDMI,
USB, and FFCs are fully seated
on the formatter.
Is the back-light
adjustable?
Open the
diagnostic function.
Perform the
back-light test.
Is the printer in bright
sunlight?
If yes, move the
product to a
different location.
134 Chapter 2 Solve problems ENWW