Sony FPF55C17196UA Service Manual page 30

(1)
X-SUS board
CN21 (3)-(5) pins or
CN21 (7)-(8) pins
are shorted.
CN21
(3)(4) : Vcc
(5)(6)(7)': GND
(8)(9)(10) : Vs
Y-SUS board
CN31 (4)-(6) pins or
CN31 (7)-(8) pins
are shorted.
CN31
(2)(3)(4): Vs
(7) : Vcc
(6)(8) : GND
ABUSU4 board
CNU4-5 (1)-(7) or
CNU4-5 (5)-(7) short
CNU4-5
(1)(2): Va
(4)(5) : Vcc
(6)(7): GND
(2)
Y
N
Y
Remove SDM from the
following (2) connectors.*
N
Y-SUS board
CN31 (4)-(6) pins or
CN32 (7)-(8) pins
are shorted.
Y
Disconnect the following (3)
connectors.*
CNU2-4(ABUS-U2)
CNU3-5(ABUS-U3)
N
CNU3-10(ABUS-U3)
Each ABUS-U* board
CNU1-4(1)-(7) or (5)-(7)
CNU2-7(1)-(7) or (5)-(7)
CNU3-10(1)-(7) or 5)-(7)
CNU4-3(1)-(7) or (5)-(7)
short
Switching circuit (power supply)
has short-circuit.
* Refer to Chapter 5.3 for
SDM removal procedure.
CN 32
CN 33
N
SDM chip/Flexible shorted
Y
1pin
N
Y
Power supply circuit has short-circuited.
-26-
X-SUS board is
defective.
SDM is
defective
(Panel chassis
is defective.)
Y-SUS board is
defective.
Switching circuit
(power supply) has
CNU4－5
ADM is defective
(Panel chassis is
defective.)
ADM chip/Flexible shorted
ABUS-U* board
is defective.
End of analysis