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