Troubleshooting Tables
Troubleshooting
3-6 Efficia CM Series Repair Guide
Display Problems
Symptom Possible Cause Action
The power is on, but the
monitor screen is blank.
The monitor is in Standby
mode.
Press the On/Standby key to
end Standby mode.
The connection with the
backlight LCD is faulty.
Ensure that there is a proper
connection between the cable,
LCD, and main board.
The LCD is faulty. Replace the LCD. See
“Removing the LCD Assembly”
on page 4-29
The main board
malfunctioned.
Replace the main board. See
“Replacing the Main Board” on
page 4-27.
The monitor displays random
or distorted graphics with a
white background.
The LCD signal cable is not
attached correctly.
Open the monitor and reseat
the LCD signal cable. See
“Removing the LCD Assembly”
on page 4-29.
The LCD malfunctioned. Replace the LCD. See
“Removing the LCD Assembly”
on page 4-29.
The main board
malfunctioned.
Replace the main board. See
“Replacing the Main Board” on
page 4-27.
The monitor turns on and the
opening screen and/or color
bar starts, but then freezes.
The main board
malfunctioned.
Replace the main board. See
“Replacing the Main Board” on
page 4-27.
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