2.0 Fault flow chart
No Backlight
Check Power supply
to PCB8, Decoupling
P35 pin -5; +24V
pin 6-0; GND
Check power supply
Backlight from Power
supply P6
pin -5; +24V
pin 6-0; GND
Replace
Main chassis
(module 999)
Check W
connection 4P6 &
8P35
No
Yes
Re-establish
connection
Check power supply
on scaler PCB5 P8
pin , 3, 5; GND
pin 2, 4, 6; + 4V
Check power supply
from power supply
PCB to scaler
PCB4 P3
pin , 3, 5; GND
pin 2, 4, 6; +4V
Replace
Main chassis
(module 999)
Check power supply
on Display inverter
at W8
pin -5; +24V
pin 6-0; GND
both supplies OK?
Check connection
W0, between 4P3
& 5P8
Visual check of
connection W6 from
scaler to LCD,
connected at LCD
Check connection
W2, CTRL signals to
scaler PCB
Re-establish
connection
Fault may be located
in either Main chassis
or in LCD panel
Replace
Main chassis
(module 999)
LCD defect
Reconnect
cable W0
ABO-CENTER
v/HENRIKSENS
ELEKTRONIK
