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Trouble Shooting
Power LED
Blink
Trouble
LED
4 times
blink<
42"
SD
(TH-42PD50U)
>
Trouble
Mode
and
Defective
Board
Trouble
Mode
Defective
Board
(Possibility)
Power
SOS
=Vsus,
5V
down
P
,
SC, SS,
D,
SC,SU
Board
(
P
> SC, SS,
D,
SU, SD)
How
to find
the defective
board
^
No (VSUS NG)
^
Disconnect
SC2
and
SS1
..Power
SW
ON.
"VSUS
output
at
P2's
1
or
2
pin
before
Shutdown
?
<
Power
SW
ON.
-VSUS(*1)
output
N
at
P2's
1
or
2
pin
x
before
Shutdown
?
No^
.
>
»Ip Boardl
in
i
1
Yes
(Vlow
NG)
Power
SW
ON.
/5V
output
^at
P25's 7
or
9
pin
before
Shutdown
?
j
Yes
|P
Boardl
No(5V NG)
Yes
/s.
Connect SC2.
Disconnect
SS11.
L
XPower SW
ON.
VSUS
output
at
SC2's
1
or
2
pin
before
Shutdown
?
^
Yes
|SS
Boardl
No
Disconnect
SU
and
SD
from
SC
(
After
Power
SW
ON,
Power
comes
up
?
>
2
).
No
Yes
(
Su|>r
SD
NG)
Connect
SU
to
SC.
SC
Board
No
(D
or
P
or
C
or
Panel
NG)
No
(Por
D NG)
Disconnect
SD
from
SC(*2).
After
Power
SW
ON
Power
comes
up
?
Yes
(SpjfJG)
No
Disconnect
SC20
and
SS23
<After
Power
SW
ON,
Power
comes
up ?
Yes
(SC
or
SS
NG)
JT
Disconnect
D33
and D34.
.Disconnect
SC20
(or
D20).(*3)
>
_
After
Power
SW
ON,
Power
comes
up
?
Yes
(C
or
Panel
NG)|
^
Power
SW
OFF.
disconnect P25
(or
D25)..
P25's 7
or
9
pin
Short
with
GND
?
Yves
[SD
Board]
No
SU
Board
P Board
Disconnect
SC20
(or
D20).
No
Connect
D34. (Disconnect D33) (Cl
or
After
Power
SW
ON,
Panel
Power comes
up ?
Ye^C2
or
Panel
NG)
Power
SW
OFF.
No
i*<:
Disconnect
all
flexible
cables
<CB1~CB3
from
Cl
board.
>-~*]Panel
20pin
of IC(*4)
in
Cl
Short
with
GND
?
Power
SW
OFF.
No
Disconnect
P25
(or
D25).-^
D25's 7
or
9
pin
Short
with
GND
?
Tys
s
D
Board
P
Board
Yes
No
Power
SW
OFF.
Disconnect
all
flexible
cables
1
<CB4~CB7
from
C2
board.
^—I
Panel
I
20pin
of IC(*4)
in
C2
Short
with
GND
?
Cl Board
Yes
C2
Board
(*1)
VSUS
about
180V
(Accurate voltage
is
described
in
Panel
Label
on
the chassis)
<
Connect SC20.
Disconnect SS23.
After
Power
SW
ON,
Power
comes
up
?
Yes
(*2)
Be
careful that
disconnected
SU
or
SD
board
doesn't
touch
SC
board.
N°i
,
>~^ |SC
Board]
SS
Board
(*3)
The
reason
of
disconnect
SC20
is
to
prevent
6 times
SOS
caused
by disconnect
D33
and
D34.
(*4)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
10
4
Power
Supply and
Protection
Circuit
4
Check
Point
Location
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