Hitachi P50X901/DW3-D Service Manual page 41

TROUBLESHOOTING THE 50AF1 PANEL
Connect CN23 (X-SUS), CN32 (Y-SUS),
and Turn on PDP
On PSU board
Vcc (5V), Vs(89V),
Va(65V) exists ?
Connect SDR U /D (with CN34 and CN35)
On PSU board
A
Vcc (5V), Vs (89V),
Va (65V) exists ?
N
A
L
Turn off AC power.
Y
Connect CN 26 (X-SUS).
Turn on Power
S
I
S
O On PSU board
Va (65V) exist?
P
E
R
Turn off AC power.
A
Connect CN 06(ABUSB).
Turn on Power.
T
I
O
On PSU board
Va (65V) exists ?
N
Turn off AC power.
Connect CN 06(ABUSB).
Turn on Power.
(3)
N
Y
Turn off AC power
Turn on PDP
N
Y
Y
N
N
Y
(4)
Panel or X-SUS board or
Y-SUS board is defective.
In case that Vs Power system or Va Power system of
X-SUS or Y-SUS is defective, Vcc starts but goes down
in a few seconds.
Turn Off AC power and disconnect YFPC from
CN812, CN822, CN823, CN831, CN832, CN833,
and Turn on AC power
On PSU board
N
Vcc(5V), Vs (89V)
exists ?
Y
Turn off AC power and remove ADMs from
following connectors CN01, CN02, CN03, CN04
Afterwards, turn on Power (Vsago)
N
On PSU board
Va(65V) exists ?
Y
Turn off AC power.
And remove ADMs from CN01, CN02, CN03,
and CN04. After that turn on PDP
On PSU board
Va (65V) exists ?
Y
40
SDR U or D board is
defective
YFPC or Panel is defective
Panel Defective
ABUSC (D) board is defective.
ADM is defective
(Panel is defective.)
N
ABUSB board is defective.
ADM is defective
(Panel is defective.)
Turn off AC power, End of analysis