Sony KDE-55XBR950 (serv.man2) Service Manual ▷ View online
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4.6 PROBLEM ANALYSIS PROCEDURE
4.6.1. "The entire screen does not light (Main power is turned off)” Problem analysis procedure
The entire screen does not light.
(Main power is turned off.)
PC for analysis
Connected?
Analysis using PC
Chapter 4.7
Turn on AC power.
PSU board
Vpr2 (3.3V)
PSU board is
defective.
Y
Y
N
N
Turn off the AC power.
Remove the following power connectors
(4 locations):
CN 21 (X-SUS）
CN 31 (Y-SUS)
CN 4-5 (ABUS-U4)
CN 24 (ABUS-D4)
Turn off AC power.
Connect CN 9 (LOGIC).
Turn on AC power
Remove CN9 (LOGIC)
PSU board
Vpr2 (3.3V) exists?
LOGIC board is
defective.
N
Y
Turn off the AC
power.
End of analysis
STANDBY power
supply has defect
supply has defect
STANDBY power supply
(MPU power supply) system
has short-circuited.
(MPU power supply) system
has short-circuited.
(1)
-26-
Y
X-SUS board is
defective.
Y-SUS board
CN31 (4)-(6) pins or
CN31 (7)-(8) pins
are shorted.
are shorted.
ABUSU4 board
CNU4-5 (1)-(7) or
CNU4-5 (5)-(7) short
CNU4-5 (5)-(7) short
Y
Y
Remove SDM from the
following (2) connectors.*
CN 32
CN 33
Y-SUS board
CN31 (4)-(6) pins or
CN32 (7)-(8) pins
are shorted.
CN32 (7)-(8) pins
are shorted.
SDM is
defective
(Panel chassis
is defective.)
Y
Y-SUS board is
defective.
N
ADM is defective
(Panel chassis is
defective.)
ABUS-U* board
is defective.
End of analysis
N
Y
Switching circuit (power supply)
has short-circuit.
has short-circuit.
Switching circuit
(power supply) has
(power supply) has
SDM chip/Flexible shorted
ADM chip/Flexible shorted
Power supply circuit has short-circuited.
* Refer to Chapter 5.3 for
SDM removal procedure.
CN21
(3)(4) : Vcc
(5)(6)(7)’: GND
(8)(9)(10) : Vs
(3)(4) : Vcc
(5)(6)(7)’: GND
(8)(9)(10) : Vs
N
N
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
CNU2-7(1)-(7) or (5)-(7)
CNU3-10(1)-(7) or 5)-(7)
CNU4-3(1)-(7) or (5)-(7)
short
CN31
(2)(3)(4): Vs
(7) : Vcc
(6)(8) : GND
(2)(3)(4): Vs
(7) : Vcc
(6)(8) : GND
CNU4-5
(1)(2): Va
(4)(5) : Vcc
(6)(7): GND
(1)(2): Va
(4)(5) : Vcc
(6)(7): GND
X-SUS board
CN21 (3)-(5) pins or
CN21 (7)-(8) pins
are shorted.
Disconnect the following (3)
connectors.*
CNU2-4(ABUS-U2)
CNU3-5(ABUS-U3)
CNU3-10(ABUS-U3)
CNU4－5
1pin
(1)
(2)
N
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LOGIC board is
defective.
PSU board
Vcc (5V) exist?
N
Y
ABUSD4 board
CND4-5 (1)-(7) or
CND4-5 (5)-(7)
short.
CND4-5 (5)-(7)
short.
Y
Disconnect the following (3)
connectors.*
CND2-4(ABUS-D2)
CND3-5(ABUS-D3)
CND3-10(ABUS-D3)
ADM is defective
(Panel chassis is
defective.)
ABUS-D* board is
defective.
N
Y
Turn on AC power.
Turn on the PDP go switch on the
interface board jig.
End of analysis
Turn off the AC
power.
End of analysis
Control logic power system has short-circuited.
Power supply circuit has short-circuited.
ADM chip/Flexible shorted
Each ABUS-D* board
CND2-4 (1)-(7) or (5)-(7)
CND2-9 (1)-(7) or (5)-(7)
CND3-12 (1)-(7) or (5)-(7)
CND4-3 (1)-(7) or (5)-(7)
short.
CND2-9 (1)-(7) or (5)-(7)
CND3-12 (1)-(7) or (5)-(7)
CND4-3 (1)-(7) or (5)-(7)
short.
N
CND4-5
(1)(2): Va
(4)(5): Vcc
(6)(7): GND
CND4－5
1pin
Re-connect the following (4)
Power supply connectors.
CN21 (X-SUS)
CN31 (Y-SUS)
CNU4-5 (ABUS-U4)
CN24 (ABUS-D4)
(2)
(3)
-28-
PSU board
Vs (85V) exist?
Y
Turn off the AC power.
Turn off the AC power.
Disconnect
CNU4-5(ABUSU4).
Turn on AC power.
PSU board
Va (63V) exist?
ABUSU1-4 boards
are defective.
Turn on AC power.
Y
PSU board
Va (63V) exist?
ADM is defective.
N
Turn off the AC power.
Disconnect
CND4-5(ABUSD4).
Turn on AC power.
PSU board
Va (63V) exist?
ABUSD1-4 boards
are defective.
Y
N
PSU board is
defective (Vs).
Turn off the AC power.
End of analysis
N
ADM chip has abnormality.
Y
N
Power supply line has abnormality.
(Ex. capacitor)
(Ex. capacitor)
Power supply line has abnormality.
(Ex. capacitor)
(Ex. capacitor)
Turn off the AC power.
End of analysis
(3)
(4)
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