Sony KDE-55XBR950 (serv.man2) Service Manual ▷ View online
-29-
Disconnect between
SDM and Y-SUS
Measure of SDM power line
resistor (A1-A2, B1-B2,
C1-C2, D1-D2)
Does SDM power
supply line short?
supply line short?
Y
N
SDM chip operation is abnormal.
SDM is defective.
(Panel chassis is
defective.)
Turn on AC power.
Turn off the AC
power.
Turn off the
AC power.
PSU board
Vs (85V) and Vcc
(5V) exist?
B1
A1
A2
B2
C1
C2
D1
D2
(5)
(4)
Y
N
-30-
Disconnect between
XBB and X-SUS
Measure of XBB line resistor
(A1-B1, B1-A2, A2-B2, B2-A3,
A3-B3, B3-A4, A4-B4)
Does XBB line
short?
Y-SUS board is defective.
X-SUS board is defective.
XBB is defective. (Panel
chassis is defective.)
Turn off the AC power.
End of analysis
X-SUS board is defective.
A1
B1
A2
B2
A3
B3
A4
B4
(5)
-31-
4.6.2 "Vertical line/Vertical bar" Problem analysis procedure
One vertical line？
Turn on the power.
Any changes
phenomena?
ADM flexible has abnormal
appearance?
ADM is defective.
(Panel chassis is
defective.)
Signal cable is
defective.
Y
Heat-melted
junction is defective
(Panel chassis is
defective.)
Y
N
N
Panel address has open
circuit or ADM IC chip is
defective.
(Panel chassis is defective.)
End of analysis
End of analysis
Turn off the
power.
Y
Y
N
N
Vertical line/Vertical bar
Tap lightly on ADM flexible
heat-melted junction.
LOGIC ~ ABUS board signal
cable has abnormal appearance?
(1)
-32-
Turn off the power.
Bar of 1/2 width on
the upside does
not light?
Y
Turn off the power.
Disconnect CNU4-5 on the
ABUSU4 board.
Turn on the power.
PSU cable is
defective. Connector
has poor connection
(LOGIC board is
defective.)
ABUSU* board is
defective.
Voltage exists at
ABUSU4 board
CN U4-5.
LOGIC board is
defective.
N
Y
Bar of 1/2 width on
the downside does
not light?
Y
Turn off the power.
Disconnect CND4-5 on the
ABUSD4 board.
Turn on the power.
Voltage exists
at PSU Side?
PSU cable is defective. Connector
has poor connection.
(PSU board is defective.)
ABUSD board is
defective.
LOGIC board is
defective.
N
Y
N
End of analysis
N
Y
N
Y
N
Voltage exists
at PSU Side?
Voltage exists at
ABUSD4 board
CND4-5?
(1)
N
(2)
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