Sony KE-42TS2E / KE-42TS2U Service Manual ▷ View online
30
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
C
onnected?
Analysis using PC
Chapter 4.7
Turn on AC power.
PSU board Vpr2
(3.3V) exists?
PSU board is
defective.
Y
Y
N
N
Turn off the AC power.
Remove the following power connectors
(4 locations):
(4 locations):
CN 23 (X-SUS）
CN 33 (Y-SUS)
CN 42 (ABUSR)
CN 52 (ABUSL)
CN 33 (Y-SUS)
CN 42 (ABUSR)
CN 52 (ABUSL)
Turn off AC power.
Connect CN 6 (LOGIC).
Turn on AC power
Remove CN6 (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
abnormality.
supply has
abnormality.
STANDBY power supply (MPU
power supply) system has
short-circuit.
power supply) system has
short-circuit.
1
31
1
Y
X-SUS board is
defective.
defective.
Y-SUS board
CN33
1
―
2
pins or
CN33
7
―
5
pins
are
shorted.
ABUSL board
CN52
1
―
4
pins or
CN52
5
―
7
pins
are shorted.
Y
Y
Remove SDM from the
following (2) connectors.※
CN 34
CN 35
following (2) connectors.※
CN 34
CN 35
Y-SUS board
CN33
1
―
2
pins or
CN33
7
―
5
pins are
shorted.
SDM is defective
(Panel chassis is
defective.)
Y
Y-SUS board is
defective.
N
ADM is defective
(Panel chassis is
defective.)
ABUSL board is
defective.
End of analysis
N
Y
Switching circuit (power
supply) has a short-circuit.
supply) has a short-circuit.
Switching circuit (power
supply) has short-circuit.
supply) has short-circuit.
SDM chip/Flexible shorted
ADM chip/Flexible shorted
Power supply circuit has a short-circuit.
* Refer to Chapter 5.3 for
SDM removal. procedure.
CN23
3 : Vcc
4 : GND
6 : GND
8 : Vs
3 : Vcc
4 : GND
6 : GND
8 : Vs
N
N
* Refer to Chapter 5.4 for
ADM removal. procedure.
ABUSL board
CN52
1
―
4
pins or
CN52
5
―
7
pins
are shorted.
CN33
1 : Vcc
2 : GND
5 : GND
7 : Vs
1 : Vcc
2 : GND
5 : GND
7 : Vs
CN52
1 : Va
4 : GND
5 : GND
7 : Vcc
1 : Va
4 : GND
5 : GND
7 : Vcc
X-SUS board
CN23
3
―
4
pins or
CN23
6
―
8
pins
are shorted.
Remove ADM from the following
(2) connectors.※
CN 53
CN 54
CN 55
CN 56
(2) connectors.※
CN 53
CN 54
CN 55
CN 56
2
32
LOGIC board is
defective.
PSU board
Vcc (5V) exists?
N
Y
ABUSL board
CN42
1
―
4
pins or
CN42
5
―
7
pins
are shorted.
Y
Remove ADM from the following (4)
connectors.
connectors.
CN 43
CN 44
CN 45
CN 46
CN 44
CN 45
CN 46
ADM is defective
(Panel chassis is
defective.)
ABUSR board is
defective.
N
Y
Turn on AC power.
Turn on the Jig PDP go switch.
Turn on the Jig PDP go switch.
End of analysis
Turn off the AC power.
End of analysis
Control logic power system has short-circuit.
Power supply circuit has short-circuit.
ADM chip/Flexible shorted
* Refer to Chapter 5.5for
ADM removal. procedure.
ABUSL board
CN42
1
―
4
pins or
CN42
5
―
7
pins
are shorted.
N
CN42
1 : Va
4 : GND
5 : GND
7 : Vcc
1 : Va
4 : GND
5 : GND
7 : Vcc
3
2
33
PSU board
Vcc (5V) exists ?
Y
Turn off the AC power.
Remove ADM 1 – 8
Turn off the AC power.
Connect CN 52(ABUSL).
Turn on AC power.
PSU board
Vcc (5V) exists ?
ABUSL board is
defective.
Turn off the AC power.
Connect CN 42(ABUSR).
Turn on AC power.
Y
PSU board
Vcc (5V) exists ?
ABUSR board is
defective.
N
Turn off the AC power.
Connect CN 23(X-SUS).
Turn on AC power.
PSU board
Vcc (5V) exists ?
X-SUS board is
defective.
Turn off the AC power.
Connect CN 33(Y-SUS).
Turn on AC power.
Y
N
Y-SUS board is
defective.
Turn off the AC power.
End of analysis
N
Logic buffer circuit has abnormality.
Y
N
Logic buffer circuit has abnormality.
DC/DC power supply circuit or control logic circuit
has abnormality.
has abnormality.
DC/DC power supply circuit or control logic circuit has
abnormality.
abnormality.
3
4
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