Nothing Display On Screen (Screen Is Black, Color Of Led Is Blue) - Acer AL1716 Service Manual

4.4 Nothing display on screen (screen is black, color of LED is blue)

Is backlight lit?
OK
Does computer output RGB video
signals?
OK
Check OSD
menu to display on the screen when
you press 'MENU' key.
OK
Proceed 'Abnormal screen detection' section
Check the 1V8 power are
supplied on I306
OK
Check the 5V
power is supplied on P306
pin28, pin29, pin3 to the
LCD panel
OK
Check the P306 all
LVDS signals
OK
Failure Point:
1. The LVDS cable beoke
between P306 and LCD module.
2. LCD module is failure.
4. Troubleshooting (continued)
NG Proceed to 'Checking the backlight unit' section.
Check the video cable for failure. Check the host for
output signal with all black only.
1. Change pattern of video signal output on the host
computer.
NG
2. Reconnect the video cable.
3. Change the video cable.
NG
OK
Check if the voltage
NG on I301 pin3 that is DC
power at 5V
OK
Check if the TTL
level on Q302 pin2 and TTL
level is low
OK
Failure Point:
Q302 is failure
NG
Failure Point:
1. Printed wire broke between
P306 and I306 LVDS signals.
2. I306 is defected.
Check if the
LCD module signal cable
is connected between the
Interface Board and LCD
Module.
OK
Check the 3V3 power
supplied to I306
NG
Check if the
voltage on I309 pin8 that is
power DC at 5V
OK
Failure Point: I306 is defected.
NG
Check if the voltage on I306
pin1 that is power DC 3V3
NG
Failure Point:
1. I301 is open.
2. Printed wire is broken
between P306 pin28, pin29
and FB303.
NG
Check the PANEL
ENABLE signal of the
rectangle input Q302 pin2 at
TTL high level.
OK
Failure Point:
1. Printed wire broke between Q302 pin2,
I306 pin127.
2. I303 is failure
ACER AL1716W
Go to cover page
NG
The LVDS cable is disconnected.
NG
I309 may be damaged.
Failure Point:
NG
Failure Point:
1. Printed wire broke between
OK
I307 pin3 and I306 pin1
2. L336 is open
Failure Point:
I306 is failure
Failure Point:
NG
Q302 is failure
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