Comen N Series - Display Failures

Troubleshooting Guide
3
In general, the AC indicator light’s on-and-off status can be utilized as a signal to figure out whether the
connection line and power source are functioning normally.
● The battery indicator does not light
The battery status determines how the battery indicator works. If the battery is functioning normally, enough
and works alone, the battery indicator flashes at a frequency of 1 HZ, and the battery symbol on the screen
displays a battery power indication; if the battery is functioning normally, not full, and works together with
the AC, the battery indicator turns on, and there is a battery charging indication at the battery symbol on the
screen; if the battery is functioning normally, full, and electricity supply together with the AC, the battery
indicator light goes out, and the battery symbol on the screen shows that the battery is fully charged.
In general, the battery indicator light’s on-or-off status can be utilized as a signal to figure out whether or not
the battery is functioning normally while it operates on its own.
Table 4-1
4.6.2 Display Failures
Symptoms
Possible Cause
Corrective Action
Screen is
white/black/display
s splash or flashing
specks
Internal cables defective or
poorly connected
1. Check if the cables are poorly connected.
2. Check if the cables are defective. If yes,
replace them.
The display module is
defective
Replace the display module
The mainboard is defective
Replace the mainboard
Possible causes of the symptoms:
Screen displays splash or flashing specks
● A defective screen can cause the following symptoms:
■ There is one or more vertical bright lines on the screen surface.
■ There is one or more horizontal bright lines on the screen surface.
■ There is one or more black spots on the screen surface.
■ There are a lot of bright dots on the screen that resemble snow.
■ The screen’s side corners are grating with white.
■ Water ripple interference is present on the screen.
● A defective LCD cable ormainboard can cause the following symptoms:
■ The lettering on the screen display flickers.
■ There are erratic lines on the screen.
■ The image on the screen flickers.
■ The screen display’s color is warped.
● A poorly connected backlight can result in the screen flickering or displaying irregularly.
Table 4-2