Fujitsu Plasmavision PDS4208W-B Service Manual page 15

Check 1
(1) Turn main power off and disconnect connectors CN8, CN10, CN41, CN42, CN49 and
CN50 on power supply unit.
(2) Connect 1 to pin 2 and 3 to pin 4 on CN4 connector.
(3) Turn on main power and power switch.
lamp change to
green?
No
(1) Turn main power off and disconnect connector CN103 on Power Supply Unit.
(2) Connect 1 to pin 3 on connector CN103.
(3) Disconnect all connectors on power supply unit.
(4) Turn on main power and the power switch.
Is voltage at
each connector on
Power Supply unit
normal ?
Yes
(1) Turn main power off and connect connector CN103 to DC/DC power PCB.
(2) Connect pin 5 of P503 to pin 2 of P502 on DC/DC power PCB.
(3) Disconnect all connectors on DC/DC power PCB except P501.
(4) Turn on main power and power switch.
Is voltage at
connector on
DC/DC power PCB
normal?
Yes
(1) Turn main power off and remove Video PCB Assy.
(2) Turn on main power and power switch.
(3) Check state of green lamp.
Is green lamp lit
continuously?
Yes
Start
Yes
Does
No
No
No
Power supply protector operated
Power lamp : Flashing continuously in red.
(at an interval of 0.5 sec)
PDP faulty.
Power Supply
circuit faulty.
DC/DC power
circuit faulty.
Main/Digital
circuit faulty.
Video circuit
faulty.
– 14 –
Replace PDP.
Vs and -Vy must be adjusted.
Replace Power
Supply Unit.
Vs and -Vy must be adjusted.
Replace DC/DC
power PCB Assy.
Replace Main
/Digital PCB Assy.
Replace Video
PCB Assy.