Panasonic VIERA 50 Series - Page 12

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 ?
Yes
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 or
.
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 ?
^Yes
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^^iYes (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