Hitachi P50H401/DW3-U Service Manual page 142

TROUBLESHOOTING THE 42AE1 PANEL:
4.6.2 "Vertical line/Vertical bar" Problem analysis procedure
Vertical line/Vertical bar
LOGIC board – ABUS
board signal cable has
abnormal appearance?
N
ADM with COF
ADM flexible
cable has abnormal
appearance?
N
Turn On, Vsago provided
One vertical
line？
N
Left half of the screen
does not light?
N
Right half of the screen
does not light?
N
(1)
Y
Look for tears, rips, burns, etc...
Y
Look for tears, rips, burns, etc...
ADM with COF
Y
Tap lightly heat seal portion
of ADM flexible cable.
Y
Any
changes?
N
Y
Y
Va(63V) exists on
RL41(resistor) on
ABUSL board?
N
Connector to ABUS PWB
Heat seal portion is defective
Panel is Defective
Address electrode on
glass Panel has open circuit or
ADM IC chip is defective.
ADM IC = COF
Panel is Defective
LOGIC,ABUSR board or
Signal cable is defective.
Or loose contact of
CN2 (LOGIC) or CN46 (ABUSR)
LOGIC, ABUSL or Signal cable is
Y
Or loose contact of
CN3 (LOGIC) or CN51 (ABUSL)
Power cable (CN52 to CN47) is
defective or Loose contact
of CN47(ABUSR)
131
Signal cable is defective
ADM is defective
(Panel is defective.)
Connector to Panel
COF COF
defective.
Turn off the AC power,
End of analysis