Sony FPF55C17196UA Service Manual page 36

(1)
Bar of 1/2 width on
the upside does
not light?
N
Bar of 1/2 width on
the downside does
not light?
N
(2)
Y
Voltage exists at
ABUSU4 board
CN U4-5.
N
Turn off the power.
Disconnect CNU4-5 on the
ABUSU4 board.
Turn on the power.
Voltage exists
at PSU Side?
N
Y
Voltage exists at
ABUSD4 board
CND4-5?
N
N
Turn off the power.
Disconnect CND4-5 on the
ABUSD4 board.
Turn on the power.
Voltage exists
at PSU Side?
N
-32-
Y
LOGIC board is
defective.
Y
ABUSU* board is
PSU cable is
defective. Connector
has poor connection
(LOGIC board is
Y
LOGIC board is
defective.
Y
ABUSD board is
PSU cable is defective. Connector
has poor connection.
(PSU board is defective.)
defective.
defective.)
defective.
Turn off the power.
End of analysis