Service manual

4.4 Nothing display on screen (screen is black, color of LED is blue)
Is backlight lit? Proceed to ‘Checking the backlight unit’ section.
Does computer output RGB video
signals?
NG
OK
1. Change pattern of video signal output on the host
computer.
2. Reconnect the video cable.
3. Change the video cable.
NG
OK
Check the video cable for failure. Check the host for
output signal with all black only.
Check OSD
menu to display on the screen when
you press ‘M E NU ’ key.
NG
Check if the
LCD module signal cable
is connected between the
Interface Board and LCD
Module.
Proceed ‘Abnormal screen detection’ section
OK
The LVDS cable is disconnected.
NG
Check the 3V3 power
supplied to I306
OK
Check if the
voltage on I309 pin8 that is
power DC at 5V
NG
I309 may be damaged.
NG
OK
OK
Failure Point: I306 is defected.
Check the 1V8 power are
supplied on I306
NG
OK
Failu re Point:
Check if the voltage on I306
pin1 that is power DC 3V3
Failure Point:
1. Printed wire broke between
I307 pin3 and I306 pin1
2. L336 is open
NG
Failure Point:
I306 is failure
OK
Check the 5V
power is supplied on P306
pin28, pin29, pin3 to the
LCD panel
Check the P306 all
LVDS signals
Failure Point:
1. The LVDS cable beoke
between P306 and LCD module.
2. LCD module is failure.
Failu re Point:
1. Printed wire broke between
P306 and I306 LVDS signals.
2. I306 is defected.
NG
OK
OK
Check if the voltage
on I301 pin3 that is DC
power at 5V
NG
Failu re Point:
1. I301 is open.
2. Printed wire is broken
between P306 pin28, pin29
and FB303.
NG
OK
Check if the TTL
level on Q302 pin2 and TTL
leve l is low
NG
Failu re Point:
Q302 is failure
Check the PANEL
ENABLE signal of the
rectangle input Q302 pin2 at
TTL high level.
NG
Failu re Point:
Q3 02 is failure
Failu re Point:
1. Printed wire broke between Q302 pin2,
I306 pin127.
2. I303 is failure
OK
OK
4. Troubleshooting (continued)
17
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ACER AL1716W