Trouble Shooting Power LED Blink Trouble
LED 4
times
blink<
37”,
42”
HD (37PX50U, 42PX50U, 42PX500U)
>
Power
Supply and
Protection
Circuit
e.g 42PX500U
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
x
before Shutdown ?
Yes (Vlow NG)
Disconnect
SC2
and
SS1 1
.
^ower SW ON.
VSUS output at P2’s 1 or
2
pin
before Shutdown
?
Connect
SC2
Yes
I
Disconnect
SS11
No
=—K
P Board]
No
No
Power SW ON.
/5V output
^at
P25’s 7 or
9
pin
'
before Shutdown ?
*
No(5V NG)
Yes
P Board
Power SW ON.
:
VSUS output at SC2’s 1 or
2
pin
before Shutdown ?
Yes
|SS Board I
Disconnect
SU
and SD from
SC
(*2).
After Power SW ON,
,
n
Power comes up
?
|SC Boardl
"I
Yes
(
SU
br
SD NG)
Disconnect SC20 and SS23.
After Power SW ON,
Power comes up ?
Yes
(SC
or
SS NG)
No (D or P or C or Panel NG)^^
No(PorDNG)
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 ?
»,
-ZU^Ye
s (C or Panel NG)
^Yes
|
Keep Disconnect SC20 (or D20).|
|p
Board
|
Connect D31 and D32.
No
nkrwinprt m?
No
.(Disconnect D33 and D34)
,
(Cl °r
><
ed Q D3
jJClor
After Power SW ON, C2 or
Xfter Power
|
w 0N,
Panel|
Power comes up?
Panel
PoWer comes up ?
NG)
NG)
J
In addition,
"
Yes (C2 or Panel NG)
Disconnect all flexible cables
Connect SU to SC.
Disconnect SD from
SC(*2),
After Power SW ON,
Power comes up ?
Yes (Spj^lG)
No
SD Board
SU Board
n
No
i
u
Power SW OFF.
No
Disconnect P25 (or D25)._
D25’s 7 or
9
pin Short
with GND ?
V
Yes
Id Board!
P Boardl
Yes
(C3
or
C4
or
Panel NG)
u
with Panel from C2 board
<
(ex. 42PX500 CA5-CA8).
After Power SW ON,
Power comes up ?
'VVes
In addition, Connect D34.
| p
r
"
JDisconnect only D33)
I
After Power SW ON
No
In addition,
Disconnect all flexible cables
with Panel from Cl board
(ex. 42PX500 CA1-CA4).
:
After Power SW ON,
Power comes up ?
Tves
No
Check Point Location
e.g 42PX500U
Panel
Cl Board
C2
Board
<
Connect SC20.
Disconnect
SS23.
After Power SW ON
Power comes up ?
Yes
Power
comes up ?
T_
No
No(C4 or Panel NG)
x
SS Board
SC Board
Yes (C3 or
Panel NG)
Power sw 0FF
'
Disconnect all flexible cables
^with Panel from C3 board
(ex. 42PX500 CB5-CB8).
20pin of
IC(*4) in C3
Short
with GND ?
^Yes
Power SW OFF.
Disconnect
all
flexible
cables
.with Panel from
C4
board
s
(ex. 42PX500 CB1-CB4).
"
20pin of IC(*4) in C4 Short
with GND ?
No
No
Y
Yes
|C4
Board|
Panel|
C3
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.
|
(*4)
Check one of the following 1C. <TH-37PX50U, 42PX50U, 42PX500U>
1C in C3 board : IC7301 or IC7302 or IC7303 or IC7304
1C
in
C4
board : IC7401 or IC7402 or IC7403 or IC7404
SU
=
SD
=m
ci
C2
SC
SC20
|
D3iT|D32
PB
JD34|JD33|
SS2
SS11
DG
DT
DV
PA
SS
|S S32|
SS3
C4
C3
~|C32p
GS
GK
11
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