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Trouble Shooting
Power LED
Blink
Trouble
LED
4 times
blink<
50"
HD
(TH-50PX50U, 50PX500U)
>
Power
Supply and
Protection
Circuit
e.g
50PX500U
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)
Power
SW
ON.
.VSUS(*1)
output
v
^at
P2's
1
or
2
pin
before
Shutdown
?
No
>
»
|P
Board
|
Yesjjviow
NG)
Power
SW
ON.
•5V
output
at
P25's 7
or 9
pin
'
before
Shutdown
?
__j_Yes
|P
Boardl
<
Disconnect
SC2
and SS1
1
^ower
SW
ON.
VSUS
output
at
P2's
1
or
2
pin
before
Shutdown
?
Connect SC2.
Ye^T^
Disconnect
SS11.
No
No(5V
NG)
<Power
SW
ON.
VSUS
output
at
SC2's
1
or 2
pin
before
Shutdown
?
Disconnect
SU
and
SD
from
SC
(*2)
After
Power
SW
ON,
No
Elba
flic
=
\C3_
c
—
f
3l|
$
Yes
Power
comes
up
?
I
SC
Boardl
SS
Board
Yes
(
SU
or
SD
NG)
^
Connect
SU
t
No
(D
or
P
or
C
or
Panel
NG)
No
(P
or
D NG)
Disconnect
all
of
D31 ~
D34.
Power
SW
OFF.
.Disconnect
SC20
(or
D20).(*3)
:
Disconnect
P25
(or
D25).
After
Power
SW
ON,
P25's 7
or
9
pin
Short
Power
comes
up ?
with
GND
?
Yes (SC
or|
SS
NG)
,
^Yes
(C
or
Panel
NG)
^Yes
Ip
Boardl
J
to
SC,
<Disconnect
SD
from
SC(*2)^
After
Power
SW
ON
Power
comes
up ?
Yes (Sd|nG)
No
SD
Board
SU
Board
Disconnect
SC20
and SS23,
After
Power
SW
ON,
Power
comes
up ?
No
No
r
-|Keep
Disconnect
SC20
(or
D20).|
Power
SW
OFF.
Disconnect
P25
(or
D25).
D25's
7
or
9
pin
Short
with
GND
?
Ye
s
I
D
Board
I
Ip
Board
I
5V
DET
MC
.
to.701
Vsus
DET
_
Vsus,
Vlow
stop-
Relay
OFF
-
0
©
©
®
r*
115
(16)
PANEL MAIN
ON
p
(T7)
/OFF
1
(13)
F
STB+14V
ON
/OFF
L
After
Power
SW
ON,
Power
comes
up
?
Yes
(C4
or
C5
or
Panel
NG)
C3
or
Panel
NG)
or
C6
NG)
Power
SW
OFF
3T
C2
or
After
Power
SW
ON,
C3
or
F°
wer
comes
up
?
Panel
Yes
(Cl
empanel
NG)
Disconnect
all
flexible
cables
with
Panel from
Cl
board
No
-
(ex.
50PX500 CA1
~CA3).
"|
After
Power
SW
ON,
Power comes
up ?
TYe
s
|
Cl
Board|
Panel
Connect D31 and
D32.
No
In
Addition,
No
in
Addition,
No
(Disconnect
D33
and D34)
(C1 o
r
.
Disconnect
CIO
(or
C20).
(C2
or
.
Disconnect
C21
(or
C31).
(C2
or
AI1
--
n
r
"
mi
—
P1
"'
AKI
After
Power
SW
ON,
Panel
Power comes
up ?
|sjq)
Yes
(C3
o^anel
NG)
Disconnect
all
flexible
cables
with
Panel from
C3
board
No
'
(ex.
50PX500 CA8-CA1
1),
After
Power
SW
ON,
Power comes
up
?
TYe
s
[c3 Boardl
Panel
Disconnect
all
flexible
cables
with
Panel from
C2
board
No
*
(ex.
50PX500 CA4-CA7).
After
Power
SW
ON,
Power
comes
up ?
^Ye
s
D3
©|
1X5
©
3
IC4005
Panel
C2
Board
Check
Point Location
e.g
50PX500U
Disconnect
C41 and
C44
20pin
of IC(*4)
in
C4
Short
with
GND
?
"Y"
Yes
(C4
or
Panel
NG)
x
No
(C5
or
C6
or
Panel
NG)
Disconnect
C50
and C51
<20pin
of IC(*4)
in
C5
Short
with
GND
?
No
Connect SC20.
Disconnect SS44.
After
Power
SW
ON
Power
comes
up ?
VYes
Disconnect
all
flexible
cables
No
with
Panel from
C4
board
No
<
(ex.
50PX500 CB8-CB11).
20pin
of IC(*4)
in
C4
Short
with
GND
?
ipYes
[CfTori^^i
Yes
(C5
ofcPanel
NG)
(C6
or
Panel
NG)
Disconnect
all
flexible
cables
with
Panel from
C6
board
No
<
(ex.
50PX500 CB1-CB3).
20pin
of IC(*4)
in
C6
Short
with
GND
?
^Yes
Disconnect
all
flexible
cables
with
Panel from
C5
board
No
<
(ex.
50PX500 CB4-CB7).
20pin
of IC(*4)
in
C5
Short
with
GND
?
^TVes
C6
Board
Panel
|
(*1)
VSUS
about
180V
(Accurate voltage
is
described
in
Panel Label
on
the chassis)
|
|(*2)
Be
careful that
disconnected
SU
or
SD
board
doesn't touch
SC
board.]
|(*3)
The
reason
of
disconnect
SC20
is
to
prevent
6
times
SOS
caused by
disconnect
D31~D34.|
!
SS
Board
SC
Board
C4
Board
Panel
C5
Board
Panel
(*4)Check
one
of
the following
1C.
<TH-50PX50U,
50PX500U>
1C
in
C4: IC7401
or
IC7402
or
IC7403
or
IC7404
or
IC7405
1C
in
C5: IC7501
or
IC7502
or
IC7503
or
IC7504
or
IC7505
1C
in
C6:
IC7302
or
IC7303
or
IC7304
or
IC7306
12
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