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Trouble Shooting
Power LED
Blink
Trouble
LED
5
times
blink
< 42"
SD
(TH-42PD50U)
>
Trouble
Mode
and
Defective
Board
Trouble
Mode
Defective
Board
P5V
SOS
D, P, C,
SC,
SS
Board, Panel
(1C)
How
to find
the defective
board
No
(D
or
P
or
C
or
Panel
NG)
No
(P
or
D NG)
Disconnect
SC20
and SS23.
<After
Power
SW
ON,
=-
Power
comes
up
?
Disconnect
D33
and
D34.
^Disconnect
SC20
(or
D20).(*1)
>
_
After
Power
SW
ON,
Power
comes
up
?
Yes
(SC
or
SS
NG)
Yes
(C
or
Panel
NG)
Power
SW
OFF.
disconnect P25
(or
D25).
s
P25's 7
or 9
pin
Short
with
GND
?
TYe
s
|p
Boardl
No
Disconnect
SC20
(or
D20).(*1)
Connect
D34.
After
Power
SW
ON,
Power comes
up
?
'
Yes
(C2
or
Panel
NG)
No(C1
or
Panel
NG)
Power
SW
OFF.
No
Disconnect
all
flexible
cables
<CB1~CB3
from
Cl
board.
>—]
Panel
20pin
of IC(*2)
in
Cl
Short
with
GND
?
Yes
Power
SW
OFF.
^Disconnect
P25
(or
D25)
"D25's 7
or
9
pin
Short
with
GND
?
Ties
D
Board
P
Board
I
Cl
Boardl
Power
SW
OFF.
M No
Disconnect
all
flexible
cables
.
<CB4~CB7
from
C2
board.
Panel
|
20pin
of IC(*2)
in
C2
Short
with
GND
?
"VYes
|C2 Board|
X
Connect SC20.
^Disconnect
SS23.
.
N
.°u„
„
Softer
Power
SW
ON, >~H
SC
Board
Power comes
up
?
Tves
(*1)
The
reason
of
disconnect
SC20
is
to
prevent 6 times
SOS
|
SS
Board
caused by
disconnect
D33
and D34.
(*2)Check
one
of
the following
1C.
<TH-42PD50U>
1C
in
Cl
board
:
IC7101
or
IC7104
or
IC7105
or
IC7106
1C
in
C2
board
:
IC7201
or
IC7202
or
IC7203
or
IC7204
Power
Supply and
Protection
Circuit
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