Sony KE-42TS2E / KE-42TS2U Service Manual ▷ View online
34
Turn on AC power.
PSU board
Va (60) exists ?
Y
N
Turn off the AC power.
ABUSR board
Disconnect connector CN42.
Turn on AC power.
PSU board
Va (60) exists ?
ABUSR board
is defective.
Y
N
Turn off the AC power.
ABUSL board
Disconnect connector CN52.
Turn on AC power.
PSU board
Va (60) exists ?
ABUSR board
is defective.
Y
N
End of analysis
Turn off the AC. power
ADM chip operation is
abnormal.
abnormal.
Power supply system (capacitor, etc.,)
has abnormality.
has abnormality.
4
5
ADM is defective
(Panel chassis is
defective.)
Power supply system (capacitor, etc.,)
has abnormality.
has abnormality.
35
SDM power supply
line is
shorted.
Connect SDM/Y-SUS board
Disconnect connector.
Turn off the AC power.
Measure resistance of SDM power line
(Between A1-A2 , B1-B2, C1-C2 and D1-D2.)
PSU board
Vs(80V) exists?
PSU board
(Va block) is defective.
(Panel chassis is
defective.)
Y
N
N
Turn off the AC. power
End of analysis
Y
5
6
SDM is faulty.
(Panel chassis is
defective.)
Turn off the AC
power.
PSU board Vs
/Vccis output
Turn on AC power.
Y
N
N
Turn off the AC
power.
SDM chip is shorted.
B1
A1
A2
B2 C1 C2 D1 D2
36
6
Disconnect connection from
XBB/X-SUS board.
Measure resistance of XBB line.
(Between A1-B1,B1-A2,
A2-B2 ,B2-A3,A3-B3,B3-A4,A4-B4)
XBB line has
short-circuit.
XBB is faulty
(Panel chassis is
defective.)
X-SUS board
is defective.
Y
Y-SUS board
is defective.
X-SUS board
is defective.
End of analysis
A1
B1
A2
B2
A3
B3
A4
B4
N
37
4. 6. 2 "Vertical line/Vertical bar" Problem analysis procedure
One vertical line?
Turn on the main power.
Any changes?
ADM flexible has abnormal
appearance?
appearance?
ADM is defective.
(Panel chassis is
defective.)
Signal cable is
defective.
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
ADM IC chip is defective.(Panel
chassis is defective.)
End of analysis
End of analysis
Turn off the main
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
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