BenQ RM8602K 86" Class 4K UHD Educational Touchscreen LED Display - Manual (Page 81)

81 Troubleshooting
Some picture elements
do not light up. Some pixels of the display may not
turn on. This display is manufactured
using an extremely high level of
precision technology: however,
sometimes some pixels of the
display may not display. This is
not a malfunction.
After-Images can still
be seen on the display
after the display is
powered off. (Examples
of still pictures include
logos, video games,
computer images, and
images displayed in 4:3
normal mode) A still picture is displayed for an
over extended period of time. Do not allow a still image to be
displayed for an extended
period of time as this can
cause a permanent after-image
to remain on the display.
Symptom Possible Cause Remedy