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5. Troubleshooting (continued)
5.2 Nothing displays on the screen (Screen is black and colour of LED is blue.)
Check if the backlight is
slightly lightened from upper
corners (right/left) of LCD
panel
Does RGB video
signals output
from connected PC host?
Proceed to “5.3 Checking the backlight unit” section
1. Change pattern of video signal outputs from
the PC host to optimum resolution.
2. Reconnect the video cable.
3. Cross-test the other workable video cable.
NG
NG
OK
OK
Check if OSM menu
is displayed upon pressing the
“MENU” key
Check if video signal cable
is connected properly between
LCD monitor and PC host
NG
Failure Point
The cable is disconnected.NG
Proceed to “5.4 Abnormal Screen” section.
OK
Check if the
Voltage on I301, I303,
I320 pin3 is high DC
level at 5V.
Check if 3.3V is
supplied from I301 pin2; 2.5V is
supplied from I303, pin2, and
the 1.8V power is supplied from
I302 pin2.
Failure Point
1. The cable is broke between
P306 and LCD panel.
2. LCD panel is defected.
OK
Failure Point
NG
NG
Check all LVDS signal pins;
output from I314
Failure Point
I301, I302, I303, or I320 is
damaged.
Failure Point
Printed wire is broke or short
between P306, I314
OK
OK
NG
OK
1.Printedwireisbrokenbetween
P301 pin1, pin2, pin3, pin4 and
I301, I303, I320.
2. Check power board
21
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ACER G24