Acer AL1502 - Manual (Page 15)

AL1502 E-13
TROUBLESHOOTING
Before sending your LCD monitor for servicing, please check the troubleshooting list
below to see if you can self-diagnose the problem.
Problems Current Status Remedy
No
Picture
LED ON Using OSD, adjust brightness and contrast to
maximum or reset to their default settings.
LED OFF Check the power switch.
Check if AC power cord is properly connected
to the monitor.
LED displays
amber color
Check if video signal cable is properly
connected at the back of monitor.
Check if the power of computer system is ON.
Abnormal
Picture
Unstable Picture Check if the specification of graphics adapter
and monitor is in compliance which may be
causing the input signal frequency mismatch.
Display is missing,
center shift, or too
small or too large
in display size
Using OSD, adjust RESOLUTION, CLOCK,
CLOCK-PHASE, H-POSITION and V-
POSITION with non-standard signals.
Using OSD, in case of missing full-screen image,
please select other resolution or other vertical
refresh timing.
Wait for a few seconds after adjusting the size of
the image before changing or disconnecting the
signal cable or powering OFF the monitor.
Abnormal
Sound
No sound, or
sound level is too
low
Check the audio cable with the host PC is
connected.
Check if the volume setup of the host PC is in
minimum position and try to raise the volume
level.