Hitachi P50H401/DW3-U Service Manual page 140

TROUBLESHOOTING THE 42AE1 PANEL:
Disconnect SDR from CN34 and CN35 on YSUS
YSUS
CN32
11
-VS
10
-VS
9
N.C.
8
GND
7
VCC
6
N.C.
5
VA
4
GND
3
N.C.
2
VS
1
VS
(1)
Check resistor between
point A and B shown in
picture below in every IC
of SDR
Shorted?
N
capacitor
CN32 on Y-SUS PWB
between (1) - (4) pin or
(4) - (5) pin or (4) - (5) pin or
(6) - (11) pin shorted?
N
CN52 on ABUSL PWB
between (1) - (3) pin or
(4) - (7) Shorted?
N
N
CN42 on ABUSR board
(1)-(3) pin or (3)-(5)pin
Shorted ?
N
(2)
Y
resistor
Measure
A
B
Y
COF = Chip on Film
Y
ADM sam as COF
Disconnect ADM from
CN53, CN54, CN55 and CN56
CN52 on ABUSL board,
(1)-(3)pin or (4)-(7) pin
Shorted ?
Y
Y
ADM = COF
Disconnect ADM from
CN43, CN44, CN45 and CN46
CN42 on ABUSR board
(1)-(3) pin or (3)-(5)pin
Shorted ?
N
ABUSR is defective
129
SDRU or D is defective
Y-SUS is defective
Switching Circuit is defective
COF
Refer to section 5.4
Connector to ABUS PWB
about removing ADM
ADM = COF
N
ADM is defective
(Panel defective)
IC chip defective
ABUSL is defective
Refer to section 5.4
about removing ADM
ADM = COF
Y
ADM is defective
(Panel defective)
IC chip defective
COF
End of analysis