Hitachi P50H401/DW3-U Service Manual page 141

TROUBLESHOOTING THE 42AE1 PANEL:
Connect CN64 on PSU
Connect CN32 on YSUS
Supply PDP Power
On PSU, Vcc (5V), Vs (85V)
Disconnect SDR U and D from Y-SUS PWB
Connect Power cable to CN26 on XSUS
Connect Power cable of CN47 on ABUSR
(2)
Vsago provided
and Va (65V) exist?
Vcc 5V (CN63 pin 1)
Y
Va 65V (CN64 pin 1)
Cut off AC power
Supply AC power
On PSU, Vcc(5V), and
Vs(85V) exist?
Vcc 5V (CN63 pin 1)
Y Vs 85V (CN64 pin 7)
Cut off AC power
Supply AC power
On PSU Va(65V)
exist?
Va 65V (CN64 pin 1)
Y
Cut off AC power
Supply AC power
On PSU Va(65V)
exist?
Va 65V (CN64 pin 1)
Y
Analysis is over
NDF
PSU = Power Supply Unit
N
LOGIC board or XSUS board or
YSUS board is defective
If Vs or Va power system of XSUS or YSUS board is
failure, Vcc once is launched, but it will drop in few seconds.
N
SDRU or D is defective
After cutting off AC power, disconnect ADM
from following connector, CN43, CN44,
N
CN45 and CN46 on ABUSR board.
After that Turn on AC power.
On PSU Va(65V)
exist?
Va 65V (CN64 pin 1)
Y
ADM = COF
After cutting of AC power, disconnect ADM
N
from following connector, CN53, CN54,
CN55 and CN56 on ABUSL board.
After that Turn on AC power.
On PSU Va(65V)
exist?
Va 65V (CN64 pin 1)
Y
130
ADM = COF
N
ABUSR is defective
ADM is defective
(Panel defective)
N
ABUSL is defective
ADM = COF
ADM is defective
(Panel defective)
IC chip defective
Cut off AC power supply
Analysis is over