6-4
Chapter 6: Hardware Service
Symptom Probable
Cause
Solution
Lines
in
LCD
Display
Internal
LCD
harness
loose
Re
‐
seat
the
LCD
harness
at
the
DynaKey
Controller
Board
and
LCD
ends.
Bent
pin
in
external
LCD
cable
Check
both
ends
of
the
LCD
cable
for
bent
pins.
Fix
or
replace
cable.
No
display
(Green
LED)
Internal
LCD
cable
loose
Re
‐
seat
the
LCD
harness
at
the
DynaKey
Controller
Board
and
LCD
ends.
Internal
backlight
harness
loose Ensure
that
the
backlight
harness
is
securely
fastened
to
the
DynaKey
Controller
Board
No
display
(orange
LED)
7452/7453/PC:
Unit
in
standby
mode
(screen
blank)
Return
unit
from
standby
as
required
by
application.
Ensured
Keylock
not
in
L
position.
PC
or
workstation
not
turned
on.
Turn
PC
or
workstation
ON
Cables
loose
Ensure
all
cables
are
securely
fastened
