Panasonic VIERA 50 Series Service manual

Order NO.ITD0509055BE
Service Hints
Plasma Television
vie r*
<500/50 Series> TH-50/42PX500U
TH-50/42/37PX50U
TH-42PD50U
Trouble Shooting for Power Supply
This service hint is published for technicians and engineers for repair.
And it gives you the information how to judge the defective board
of PDP.
Please file and use this Service Hints together with the main service
manual and other publications related to models.
AWARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service aproduct.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
Panasonic ©2005 Matsushita Electronics Industries Co..Lld. All
rights reserved. Unauthorized copying and distribution
is aviolation of law.

-CONTENTS \
Circuit Operator!
1.
Power Supply P03
2.
Protection Circuit P05
Trouble Shooting
1.Introduction P07
2.
Power LED No Lit P08
3.
Power LED Blink
LED 2,3 times blink P09
LED 4times blink (TH-42PD50U) -—P10
(TH-37PX50U) —P11
(TH-42PX50U)
(TH-42PX500U)
(TH-50PX50U) —-P12
(TH-50PX500U)
LED 5times blink (TH-42PD50U) —P13
(TH-37PX50U) —P14
(TH-42PX50U)
(TH-42PX500U)
(TH-50PX50U) —P15
(TH-50PX500U)
LED 6times blink (TH-42PD50U) —P16
(TH-37PX50U)
(TH-42PX50U)
(TH-42PX500U)
(TH-50PX50U) —P17
(TH-50PX500U)
LED 7times blink (TH-42PD50U) —P18
(TH-37PX50U)
(TH-42PX50U)
(TH-42PX500U)
(TH-50PX50U) —P19
(TH-50PX500U)
LED 8times blink —P20
v
2
f\
LED 10times blink (TH-42PD50U) —P21
(TH-37PX50U)
(TH-42PX50U)
(TH-50PX50U)
(TH-42PX500U) —P22
(TH-50PX500U)
LED 11,12 times blink P23
vJ

Ciicuit Operation Power Supply
<TH-42PX50U, 50PX50U, 42PX500U, 50PX500U>
P Board Power Supply Outline
P Board Primary Circuit MC301(42inch)
3
PBoard Secondary Circuit
1nr
Mr.sni Trans
MC302 (50inchj)
Rectifier VSUS
T301
Trans
i
j
i
r
Rectifier
f|Rectifier 15V
T401
Trans
Rectifier
DP30 To PB30
V1Rectifier
T501
Trans Rectifier 5V
For Fan
P23
P25 To D25
ToSS12
To
Process
Circuits
To Audio
Circuit
PA&PB Board Regulator Circuit
PA-BOARD
paio
1
2
3
NR14V IC5602
3.3V/5V
Q5606
3.3V -*• Main 3.3V
T—TUNER_MAIN ON/OFF
-Sub 3.3V
-Sub 5V
-Sub 9V Q5603
5V Main 5V
IC5601
2.5V/9V
t—TUNER MAIN ON/OFF
Q5601
9V Main 9V
t—TUNER_MAIN ON/OFF
Sub 9V_1, Sub 9V_2
*• Main 2.5V
PB-BOARD
IC5603
BT 30V BT30V
FOR
FAN

Circuit Operation Power Supply
<TH-42PD50U, 37PX50U>
P Board Power Supply Outline
IC501
SYSTEM CONTROL
PBoard Primary Circuit
I
4
P Board Secondary Circuit
Trans
T404
Rectifier
Rectifier
Rectifier
Rectifier
Hi
Trans ,1
T410
Rectifier FSTB 14V
Rectifier
To PB30
For Fan
To D25
P5
To SC23
To
Process
Circuits
To Audio
Circuit
To PA10
PA&PB Board Regulator Circuit
PA10
1
2
3
PA-BOARD Q5606
3.3V
NR14V IC5602
3.3V/5V
Main 3.3V
t—TUNER MAIN ON/OFF
Sub 3.3V
*Sub 5V
-Sub 9V Q5603
5V Main 5V
IC5601
2.5V/9V
t—TUNER MAIN ON/OFF
Q5601
9V Main 9V
t—TUNER_MAIN ON/OFF
*Sub 9V_1, Sub 9V_2
*Main 2.5V
PB-BOARD
IC5603
BT 30V BT30V
PB5
+12Vs(W)
+12Vs(W)
+12Vs(S)
IC5803
AUDIOIOV 10Vs(W)

Circuit Operation Protection Circuit
Power LED Blink Mode
LED Blinking
times Trouble Mode Defective Circuit Board (example)
improved 42PD50U I37.42PX50U /42PX500UI 50PX50U /50X500U
1
1IIC communication NG Unknown (D)
212V down SOS P, D
33.3V down SOS D
4Power SOS
(Vsus, 5V down) P, (SC, SS, D, SU, SD)
5P5V SOS D, P, C, SC, SS, Panel
6SC Energy Recovery SOS(37”,42”)
+SC Floatinq Volt. SOS (50”) SC, SS, D, PSC, SU, SD, SS, D, P
7SC Floating Volt.(37”,42”)
DATA Driver SOS (50”) SC, SU, SD, D, PSS, D, C, P
8SS Energy recovery SOS SS, SC, D, P
9Soft-Ver. Combination NG D
10 Tuner Power SOS PA, P, (H, DG, Z, DT, DV) PA, P, (H, DG, GS, Z, DT, DV)
11 Fan SOS PB, FAN
12 Sound SOS PB, Z
LED Blinking Timing
U:J
j«-*j
I.Osec
[*) Note
2and 3times LED blinking become to 1time in 1st design.
So, when 1time LED Blinking is found, execute the flow chart
of 2and 3times described later.
Panel SOS LED 2-8 times blink <TH-42PD50U>

Circuit Operation Protection Circuit
Panel SOS LED 2-8 times blink <TH-50PX50U, 50PX500U>
DBoard
i—
SC Board
SS Board SS
IC6061 ,Q6060 SOS9 44
9
IC6062 SOS2
1Vda SOS \
19
TUNER /
subon'v* relay
OFF
Breen
led
777 on SS Board
Tuner SOS LED 10 times blink
PA Board
IC5601
AVR 2.5V/9V
9.0V
2.5V
HO-1
HO-1
HQ5601
IC5603
MAIN9V D5642
MAIN2.5V|^| D5640
5>BT30V
Q5644
OVP
40-
40-
«-
40"
MAIN2.5V
SUB3.3V
D5645
HO
—
D5649
HO
—
F_STB_14V
FROM P10 “40-
ho-
DG Board
IC4005
MPU
PA DG
Q5641 20
29 20 2/T7\ PA_SOS
(H :SOS)
SHORT DET
PBoard DBoard
Relay^
OFF
pD D DG
25 25 33
13 13 14 14
JTJ
2)HDMI 5V DET
MBS9VDET
M9J MAIN_9V_DET
(20 )SUB5VDET
TUNER
22)SUB ON
(L :OFF)
LED R
FAN SOS LED 11 times blink
PB Board DG Board
Sound SOS LED 12 times blink
6

Introduction
Introduction of Power Trouble Shooting
1.These are following 2states of Power LED in Power Trouble
A. No Lit (Relay doesn’t work)
B. Blinking several times
2, Basic Idea of how to find the defective block
A. Check if the voltage comes up
Normally, when Power ON, shut down occurs immediately.
So, check is necessary before shutdown.
B. Check if power comes up, when disconnecting the board which seems to be defective.
If power comes up (*) when disconnecting aboard,
the board is defective. (*) “Power comes up” means “no shutdown”.
3.
Adjustment after P.C.B. exchange
When exchange the following boards, voltage adjustment is necessary.
Please refer to Service Manual. „^„——
P.C.B VoltageVoltage
Pboard VsusVsus
SC board Vad
SS board Ve
7

Trouble Shooting Power LED No Lit Trouble
Trouble status and Defective Block
Power LED Status (cause) Defective Block
No Lit (STB 5V NG) AC Power Code or PBoard (or other Boards)
How to find the defective board
with GND? with GND?
Yes
HBoard
Yes
GBoard
8
STB 5V Power Supply
@
500series |STB 5V|
P
9
Hi,
4
FUSE 10 -
0
10
MICOM
IC9003
12 -
DG
MICOM
IC4005
DG
3
12
DG
1
40-
IB]
HH
117
12
IB]
HH
151
133
IB]
G G
51 2
32
i@
K
1
H2Power
•LED
Check Point Location e.g 42PX500U

Trouble Shooting
LED 2times blink
Trouble Mode and Defective Board
Trouble Mode Defective Board (Possibility)
12V down SOS P, D, PB Board (P>D, PB )
How to find the defective board
Power SW ON.
<12V output >
at P25’s (or D25’s) 1or 2pin^
before Shutdown ?
Jves
DBoard
No Power SW OFF.
^Disconnect P25 (or D25).'
^P25’s 1or 2pin Short
with GND ?
No
Yes
Power SW OFF.
X"
;w OFF.
^Disconnect P5 (or PB5).
^P5's 6or 7or 8pin Shorr^"
)?
1
with GND ?
Yes
PBoard
Power SW OFF.
^Disconnect P25 (or D25).'-
^D25’s 1or 2pin Short
with GND ?
No
PB Board
Xyos
DBoard PBoard
Power Supply and Protection Circuit
r+12V-
Vsus, Vlow stop
Relay OFF
D3 (X
DG @
•-*
IC4005<§-5
—
9
LED 3times blink
Trouble Mode and Defective Board
Trouble Mode Defective Board
3.3V down SOS DBoard
How to find the defective board
The defective board is Dboard ONLY.
Power Supply and Protection Circuit

Trouble Shooting Power LED Blink Trouble
LED 4times 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
1
..Power SW ON.
"VSUS output at P2’s 1or 2pin
before Shutdown ?
<
Power SW ON.
-VSUS(*1) output N
at P2’s 1or 2pin x
before Shutdown ?
No^
.>»Ip Boardl
in i1
Yes (Vlow NG)
Power SW ON.
/5V output
^at P25’s 7or 9pin
before Shutdown ?
jYes
|P Boardl
No(5V NG)
Yes /s.
Connect SC2.
Disconnect SS11.
LXPower SW ON.
VSUS output at SC2’s 1or 2pin
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 Por Cor Panel NG) No (Por DNG)
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 7or 9pin Short
with GND ?
Yves
[SD Board]
No
SU Board
PBoard
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 9pin Short
with GND ?
Tyss
DBoard PBoard
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 6times 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
4Power Supply and Protection Circuit
4Check Point Location

Trouble Shooting Power LED Blink Trouble
LED 4times 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 1or 2pin x
before Shutdown ?
Yes (Vlow NG)
Disconnect SC2 and SS1 1
.
^ower SW ON.
VSUS output at P2’s 1or 2pin
before Shutdown ?Connect SC2
Yes IDisconnect SS11
No
=—KPBoard]
No No
Power SW ON.
/5V output
^at P25’s 7or 9pin '
before Shutdown ?
*
No(5V NG)
Yes
PBoard
Power SW ON. :
VSUS output at SC2’s 1or 2pin
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 Por Cor 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 7or 9pin Short
Power comes up ?with GND ?
», -ZU^Yes(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 QD3 jJClor
After Power SW ON, C2 or Xfter Power |w0N, 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
nNo
i
uPower SW OFF. No
Disconnect P25 (or D25)._
D25’s 7or 9pin Short
with GND ?
VYes
Id Board! PBoardl
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. |pr"
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
YYes
|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 6times 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

Trouble Shooting Power LED Blink Trouble
LED 4times 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 1or 2pin
before Shutdown ?
No
>»|P Board|
Yesjjviow NG)
Power SW ON.
•5V output
at P25’s 7or 9pin '
before Shutdown ?
__j_Yes
|P Boardl
<
Disconnect SC2 and SS1 1
.
^ower SW ON.
VSUS output at P2’s 1or 2pin
before Shutdown ?Connect SC2.
Ye^T^ Disconnect SS11. No
No(5V NG)
<Power SW ON.
VSUS output at SC2’s 1or 2pin
before Shutdown ?
Disconnect
SU and SD from SC (*2)
After Power SW ON,
No
Elba
flic
=\C3_
c—f
3l| $
Yes
Power comes up ?ISC Boardl
SS Board
Yes (SU or SD NG) ^
Connect SU t
No (D or Por Cor Panel NG) No (P or DNG)
Disconnect all of D31 ~D34. Power SW OFF.
.Disconnect SC20 (or D20).(*3):Disconnect P25 (or D25).
After Power SW ON, P25’s 7or 9pin Short
Power comes up ?with GND ?
Yes (SC or| SS NG) ,^Yes (C or Panel NG) ^Yes
Ip Boardl
Jto 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 7or 9pin Short
with GND ?Yes
IDBoard IIp 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) FSTB+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 ?
TYes|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 -- nr"
"
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 ?
TYes[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 6times 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

Trouble Shooting Power LED Blink Trouble
LED 5times 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 Por Cor Panel NG) No (P or DNG)
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 7or 9pin Short
with GND ?
TYes
|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 7or 9pin Short
with GND ?
Ties
DBoard PBoard
ICl 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 6times 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

Trouble Shooting Power LED Blink Trouble
LED 5times blink< 37”, 42” HD (37PX50U, 42PX50U, 42PX500U) >
Trouble Mode and Defective Board
Trouble Mode Defective Board
P5V SOS D, P, C, SC, SS Board, Panel (1C)
Disconnect SC20 and SS32.
<After Power SW ON,
Power comes up ?
Yes ^
How to find the defective board
No (D or Por Cor Panel NG) No(PorDNG)
Disconnect all of D31-D34. Power SW OFF.
Disconnect SC20 (or D20). ^^-Disconnect P25 (or D25WNo
After Power SW ON, P25’s 7or 9pin Short
Power comes up ?(*1) with GND ?
TYes
|p Boardl (SC or SS NG) Yes (cor Panel NG)
|Keep Disconnect SC20 (or D20). |
No
Connect D31and D32. (Cl or
(Disconnect D33 and D34) C2 or^
Panel
After Power SW ON
Power comesup
Yes
(C3 or C4 or
Panel NG)
NG)
In addition, Disconnect D32.
(Connect only D31.)
‘After Power SW ON,
Power comes up ?
Yes
T. (C2 or Panel NG)
In addition,
Disconnect all flexible cables
with Panel from C2 board
lex. 42PX500 CA5-CA8).
After Power SW ON.
Power comes u|
rVes
No
No
(Cl or Panel NG)
Power SW OFF. No
Disconnect P25 (or D25).s.
D25’s 7 or 9pin Short
with GND ?
Vies
Id Boardl [p Boardl
In addition,
Disconnect all flexible cables
with Panel from Cl board No
ies up
'
%
|Panel
After Power SW ON,
Power comes up ?
Yes
C2 Board T
Panel |Cl Board
In addition, Connect D34
^Disconnect only D33.) No(C4 or Panel NG)
<After Power SW ON, 5
Power comes up ?
"T" Yes (C3 or Panel NG)
<Connect SC20.
Disconnect SS32.
After Power SW ON,
Power comes up ?
Tves
No
Power SW OFF.
Disconnect all flexible cables
with Panel from C3 board ^No
^ex. 42PX500 CB5-CB8).
20pin of IC(*2) in C3 Short
with GND ?
Power SW OFF.
Disconnect all flexible cables
with Panel from C4 board ^No
(ex. 42PX500 CB1-CB4). "
20pin of IC(*2) in C4 Short
with GND ?
Tves
|C4 Boardl [panell
Yes
SS Board SC Board C3 Board Panel
(*1 )The reason of disconnect SC20 is to prevent 6times SOS
caused by disconnect D31 -D34.
(*2) 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
Power Supply and Protection Circuit
Check Point Location e.g 42PX500U

Trouble Shooting Power LED Blink Trouble
LED 5times blink <50” HD (TH-50PX50U, 50PX500U) >
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
Disconnect SC20 and SS44
<After Power SW ON, -
Power comes up ?
No (D or Por Cor Panel NG]^ No(PorDNG)
Disconnect all of D31-D34. Power SW OFF. No
^Disconnect SC20 (or D20)><Disconnect P25 (or 025).^
After Power SW ON, P25’s 7or 9pin Short
Power comes up ?(*1) withGND?
Yes (SC or SS NG) —^Yes (C or Pane NG)
JC -|Keep Disconnect SC20 (or D20).|
Connect D31and D32. No In Addition, No
(Disconnect D33 and D34) (C1 o^^Disconnect CIO (or C20). (C2 or
After Power SW ON After Power SW ON,
Power comes up ?
Yes
(C4 or C5 or C6
or Panel NG)
Power SW OFF
Oj^Pa
Yes (Cl oH Panel NG)
C2 or
C3 or
Panel
NG)
Disconnect all flexible cables
with Panel from Cl board No
(ex. 50PX500 CA1-CA3). >-,
After Power SW ON,
Power comes up ?
C3 or
Panel
NG)
^Yes
|P Board |
In Addition,
^Disconnect C21 (or C31).(C2 or
After Power SW ON, Panel
Power comes up ?NG)
Yes (C3 o^anel NG)
Power SW OFF. No
^Disconnect P25 (or D25)..
D25’s 7or 9pin Short
with GND ?
Yes
DBoard PBoard
No Disconnect all flexible cables
with Panel from C2 board No
«(ex. 50PX500 CA4-CA7).
After Power SW ON,
Power comes up ?
IYes
Disconnect all flexible cables
with Panel from C3 board
(ex. 50PX500 CA8-CA11).
After Power SW ON,
Power comes up ?
.No Panel C2 Board
Panel Cl Board Panel C3 Board
Disconnect C41 and C44. ,
20pin of IC(*2) in C4 No (C5 or C6 or Panel NG)
Short with GND ?
Disconnect C50 and C51
<20pin of IC(*2) in C5
Short with GND ?
No
(C6 or t
Panel NG
<
Connect SC20
.and Disconnect SS44.^
After Power SW ON,
Power comes up ?
^Yes
Yes (C4 or Panel NG^
Disconnect all flexible cables
with Panel from C6 board No
<(ex. 50PX500 CB1-CB3).
20pin of IC(*2) in C6 Short
with GND ?
V^Yes
Disconnect all flexible cables
No with Panel from C4 board
<(ex. 50PX500 CB8-CB1 1).
20pin of IC(*2) in C4 Short
with GND ?
No
>l
Yes
Disconnect all flexible cables
with Panel from C5 board
<(ex. 50PX500 CB4-CB7). :
20pin of IC(*2) in C5 Short
with GND ?
C6 Board Panel
No
Yes
SS Board SC Board C4 Board Panel C5 Board Panel
ri)
The reason of disconnect SC20
is to prevent 6times SOS
caused by disconnect D31 -D34.
(*2)Check one of the following 1C. <TH-50PX50U, 50PX500U>
1C in C4 board :IC7401 or IC7402 or IC7403 or IC7404 or IC7405
1C in C5 board :IC7501 or IC7502 or IC7503 or IC7504 or IC7505
1C in C6 board :IC7302 or IC7303 or IC7304 or IC7306
15
Power Supply and Protection Circuit
Check Point Location e.g 50PX500U

Trouble Shooting Power LED Blink Trouble
LED 6times blink <:TH-42PD50U, 37PX50U, 42PX50U, 42PX500U >|
Trouble Mode and Defective Board
Trouble Mode Defective Board (Possibility)
SC Energy Recovery SOS SC, SS, D, P Board (SC >SS, D, P)
How to find the defective board
^No (VSUS NG) ^
Power SW ON. Disconnect SC2.(*2)
^VSUSCI )output \Power SW ON.
<v^at P2's 1or 2pin /r/SUS output at P2’s 1or
before Shutdown ?before Shutdown ?
Control Pulse NG)
Disconnect SC20.
Power SW ON. No
<(Then Power comes up). ?>|D Boardl
Output at D20’s 1,17,18,19,20 pin
OK ?(*3)
~^Yes
ISC Board]
Ye^Scan ^es
CBoard|
Disconnect SC2 and SS1 1.(*2)
Power SW ON.
2pin ^^VSUS output at P2’s 1or 2pin >"
before Shutdown ?
XYes
ISS Board] |P Boardl
(*1) VSUS about 180V (Accurate voltage is described in Panel Label on the chassis)
(*2) CAUTION
Before connecting SC2 or SS1 1after these are disconnected,
discharge is necessary to prevent potential shock caused by VSUS.
(*3)Check
Pin No. :Output
1:5V(OC)
17, 18, 19, 20 :5V(PULSE) —need oscilloscope
Power Supply and Protection Circuit e.g 42PX500U

Trouble Shooting Power LED Blink Trouble
LED 6times blink <50” (TH-50PX50U, 50PX500U) >
Trouble Mode and Defective Board
Trouble Mode Defective Board (Possibility)
SC Floatinq Voltaqe SC. SS, D, PBoard <?n •» ^np\
SC Enerqv Recovery SC, SU, SD, D, P Board &U’bD 5,5,1 Ul P)
How to find the defective board
No (VSUS NG)
Power SW ON. Disconnect SC2.(*2)
VSUS(*1 )output Power SW ON.
'at P2's(or SC2's) 1or 2pin VSUS output at P2’s 1or 2pin’
before Shutdown ?before Shutdown ?
No
Yes( SC
or S
Disconnect
KSU and SD from SC (*3).?<After Power SW ON,
Power comes up ?
Floating Volt NG
CControl Pulse NG)
No (SC or Dor PNG)
^Tes
SC Board
Disconnect SC2 and SS1 1.(*2)
Power SW ON.
VSUS output at P2’s 1or 2pin
before Shutdown ?
|SS Boardl
No
PBoard
Connect
SU and SD
to SC.
Power SW ON.
^DC15V output s
xat TP15V on SC "
before Shutdown ?
No(15V NG) No
Disconnect P23 (or SC23).
^Power SW ON.
"DC15V output at P23’s 1or 2pin>
before Shutdown ?
Yes (Sljlor SD NG)
Connect SU to SC.
Disconnect SD from SC(*3). No
After Power SW ON, ^
Power comes up ?|SU Boardl
Xes
Yes (VSCN or VAD oij^SC Control Pulse NG)
Power SW ON.
^^Output at TPVSCN on SC and-
"Output at TPVAD on SC OK
before Shutdown ?(*4)
PBoard
£Yes (SD NG)
Connect SD to SC.
.Disconnect SU from SC(*3).
After Power SW ON, +
Ye^SC Control Pulse NG)
Disconnect SC20. n0
<(Then Power comes up)
Output at D20’s 1,4,6 pin OK ?(*5)
rYes
No
SD Board
Power comes up '
Yes (SqControl Pulse NG)
Connect SU and SD to SC.
Disconnect SC20.
<Power SW ON.
(Then Power comes up)
Output at D20’s 1,17,18,19,20 pin
OK ?(*6) +Yes
ISC Boardl
No |
,
^|D Board!
(*1) VSUS about 180V (Accurate voltage is described in Panel Label on the chassis)
(*2) CAUTION
Before connecting SC2 or SS1 1after these are disconnected,
discharge is necessary to prevent potential shock caused by VSUS.
(*3) Be careful that disconnected SU or SD board doesn’t touch SC board.
(*4)Check (*5)Check (*6)Check
Test Point. :Output Pin No. :Output Pin No. :Output
TPVSCN :about 30-40V 1:5V(DC) 1:5V(DC)
TPVAD :about A90V 4, 6:5V(PULSE) —need oscilloscope 17, 18, 19, 20 :5V(PULSE)—need oscilloscope
Power Supply and Protection Circuit

Trouble Shooting Power LED Blink Trouble
LED 7times blink <TH-42PD50U, 37PX50U, 42PX50U, 42PX500U>
Trouble Mode and Defective Board
Trouble Mode Defective Board (Possibility)
SC floating voltage SOS SC, SU, SD, D, P Board (SC, SU, SD >D, P)
How to find the defective board
No (SC or Dor PNG)
Disconnect
and SD from SC (*1).=
After Power SW ON,
Power comes up ?
Connect
SU and !
to SC board.
—No(15V NG) \m0
Power SW ON. Disconnect P23 (or SC23).
,DC15V output
SU and SD r^\atJP1 5V on SC
before Shutdown ?
^Power SW ON.
^DC15V output at P23’s 1or 2pin"
before Shutdown ?
Yes (SU or SD NG)
Connect SU to SC.
Disconnect SD from SC(*1)^No
After Power SW ON,
Power comes up ?1
Yes (VSCN or VAD orJScan Control Pulse NG)
No
^Yes
|SC Board] PBoard
SU Board
Power SW ON.
-Output at TPVSCN on SC and
"Output at TPVAD on SC OK
before Shutdown ?(*2)
Yes (SD NG) Yes
|SC Board]
(Scan Control Pulse NG)
SD Board Disconnect SC20.
<( Then Power comes up ). >
Output at D20’s 1,4,6 pin OK ?(*3)
No
DBoard
(*1) Be careful that disconnected SU or SD board doesn’t touch SC board.
(*2)Check
Test Point. (Output
TPVSCN :about 30-40V
TPVAD :about A90V
(*3)Check
Pin No. (Output
1:5V(DC)
4,6 :5V(PULSE)—need oscilloscope
Power Supply and Protection Circuit e.g 42PX500U

Trouble Shooting Power LED Blink Trouble
LED 7times blink <50” (TH-50PX50U, 50PX500U) >
Trouble Mode and Defective Board
Trouble Mode Defective Board
SS Data Energy recovery SS, D, C, P
How to find the defective board
No(VDA NG)
When Power SW ON
VDA (about 75V)
output at TPVDA on SS'
before Shutdown ?
Yes
No(P or SS NG)
Disconnect SS35 (or C35)
.and SS42 (or C42).
After Power ON,
Power comes up ?
(15V or
Control Signal
NG)
Yes
r
(cjor SS NG)
Disconnect PI 2.
Short P12’s 8and 10pin.(*1)
.Power SW ON.
VDA (about 75V) output
at P12’s 1or 2pin
before Shutdown ?
|res
No
No(C1 or C2 or C3 orSS NG) SS Board PBoard
In addition,
.Disconnect Cl 1(orC21).
After Power ON,
Power comes up ?
,'Yv’es
Yes (C4 oi| C5 or C6 or SS NG) |ci Board!
Connect SS35 (or C35).
disconnect SS42 (or C42)..
After Power ON,
Power comes up ?
No In addition,
Disconnect C23 (or C33). No
'After Power ON,
Power comes up ?
,Yv?
|C2~Board|
Power SW OFF
In addition,
<Disconnect C35. >
After Power ON,
Power comes up ?
r^YeS r—
C3 Board SS
Disconnect C42 and C43.
*C42’s 1or 2, 4or 5, 7or 8pin—
Short with GND
Yes
No Disconnect C52 and C53. No Disconnect C61 .No
<C53’s 3, 5,6pin =—I
<dC61,s3, 5pin ^>
Short with GND ?Short with GND ?
C4 Board r^Tves
|C5 Boardl
Yes
|C6 Board] |SS Board]
_ _ Disconnect PI 2.
When Power SW ON, No(15V NG) P°wer SW ON. n0
‘DC15V output at TP15V on SS:KShort P12’s 8and 10pin.(*1 )>-|
before Shutdown ?
"^TYes (Control Signal NG)
No
Disconnect SS44.
Power SW ON. (Then Power Comes up)
Output at SS44’s (or C44’s) 1,14, 15, 17pin ?(*2)
15V output at P12’s 4pin
before Shutdown ?
TYes
SS Board PBoard
DBoard
(*1) The reason of short is that SW_MAIN signal is low (STB PS)
and MC701 outputs Relay ON signal for power supply.
(*2) Check
Pin NO :Output
1:5V(DC)
14, 15, 17 :5V(PULSE)—need oscilloscope
Power Supply and Protection Circuit
Id
15V-K®-
-SW_MAIN-4@-
STB_PS-^j@-
Data Energy Recovery DET
condition
NO VDA
NO 15V
NO Data Energy Recovery
Control Pulse
(SS44 14,15,17pin)
NO P5V
(SS44 Ipin)
C6 |C61 C5 2l _C5 _[C53 C43l C4 ^||C44
H H HHHH H h HHH
GS GK

Trouble Shooting Power LED Blink Trouble
LED 8times blink
Trouble Mode and Defective Board
Trouble Mode Defective Board (Possibility)
SS Energy recovery SS, SC, D, PBoard (SS >SC, D, P)
How to find the defective board
No (VSUS NG) Nq
Power SW OK Disconnect SS1 1.(*2) Disconnect SC2.(*2)
(*3) Connector
Model :Connector
42PD50U(SD) :SS23-C23
37,42PX50U,42PX500U(HD37,42) :SS32-C32
50PX50U,50PX500U(HD50) :SS44-C44
(*4) Output
Pin No. :Output
1:5V(DC)
5, 6, 7, 8:5V(PULSE)-~need oscilloscope