Panasonic TH-50PV500E Service manual

Order NO.ITD0509057BE
Service Hints
Plasma Television
vie r*
<500/50 Series> TH-50/42/37PV500E
TH-50/42/37PV500B
TH-42/37PA50E
TH-42/37PE50B
Trouble Shooting for Power Supply Ver
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-37PA50E.PE50B)— P10
(TH-42PA50E,PE50B)
(TH-37PV500E.B) —P11
(TH-42PV500E.B)
(TH-50PV500E.B) —P12
LED 5times blink (TH-37PA50E,PE50B)~- P13
(TH-42PA50E.PE50B)
(TH-37PV500E,B) —P14
(TH-42PV500E,B)
(TH-50PV500E,B) —P15
LED 6times blink (TH-37PA50E.PE50B) —P16
(TH-42PA50E,PE50B)
(TH-37PV500E.B)
(TH-42PV500E.B)
(TH-50PV500E.B) —P17
LED 7times blink (TH-37PA50E.PE50B)— P18
(TH-42PA50E,PE50B)
(TH-37PV500E,B)
(TH-42PV500E,B)
(TH-50PV500E,B) —P19
LED 8times blink —P20
v
2
f\
LED 10 times blink (TH-37PA50E,PE50B) —P21
(TH-42PA50E,PE50B)
(TH-37PV500E.B) —P22
(TH-42PV500E.B)
(TH-50PV500E.B)
LED 11,12 times blink P23
vJ

Power Supply <TH-50/42PV500E>
<TH-50/42PV500B>
P Board Power Supply Outline
P Board Primary Circuit
P Board Secondary Circuit
PA&PB Board Regulator Circuit
PA-BOARD
FSTB
FSTB
FSTB
PA10
1
2
3
NR14V IC5602
3.3V/5V
Q5606
3.3V Main 3.3V
t—TunerMAIN ON/OFF
—Sub 3.3V
—*Main 5V
Q5603
5V
t—Tuner_MAIN ON/OFF
Sub 5V 2
PB-BOARD
+12Vs(W)
+12Vs(W)
+12Vs(S)
10Vs(W)
9Vs(w)
To SS11
To SS12
To PA10
FOR
FAN
3

Power Supply <TH-37/42PA50E> <TH-37PV500E>
<TH-37/42PE50B> <TH-37PV500B>
P Board Power Supply Outline
P Board Primary Circuit
P Board Secondary Circuit
PA&PB Board Regulator Circuit
4

Protection Protection Circuit Operation
Power LED Blink Mode
LED Blinking
times Trouble Mode Defective Board (Example)
ist mimproved 37/42PA50E.PE50B |37/42PV500E,B| 50PV500E.B
i
1IIC communication NG Unknown (D)
212V down SOS P, D
33.3V down SOS D
4Power SOS
(Vsus, 5V down) P
5P5V SOS D, P, C, SC, SS, Panel (1C)
6SCAN Driver SOS(37”,42”)
+SC Floatinq Volt. (50”)
SC, SS, D, P
(SC Enerqv recovery)
SC, SU, SD, SS, D, P
(SC Enerqy recovery/ floatinq volt.)
7SC Floating Volt.(37”,42”)
DATA Driver SOS (50”)
SC, SU, SD, D, P
(SC floating volt.)
SS, D, C, P
(SS Data Energy recovery)
8SUS Driver SOS SS, SC, D, P(SS Energy recovery )
9Soft-Ver. Combination NG D
10 Tuner Power SOS PA, P, H,
DG, Z, TA, XV(*2) PA, P, H, DG, GS, Z, TA, DV, XV(*2)
ii Fan SOS PB, FAN
12 Sound SOS PB, Z, H
LED Blinking signal
\*—!
1.0s 3.0s
Note
(* 1)
2-9 times LED blinking become to 1time in 1st design.
So, when 1time LED Blinking is found, please check SOS signal
that is input to IC9003, in order to know true LED blinking time.
Check point is the connector’s pin or IC9003’s pin as shown in the
following table.
When SOS signal is found, please refer to the flow chart of its
trouble mode that the SOS signal indicates.
(*2)
XV board PE50B, PV500B only.
Check point in the case of 1time blink
LED Check Point location Check output
Blinking Trouble Mode connector No. /Pin No. IC9003 (D board) SOS
actual true input port No. signal
212V down SOS —-(R9047 in Dboard) IC9003_95 L:SOS
33.3V down SOS .... (R9007 in Dboard) IC9003_94 L:SOS
4Power SOS D25 or P25 /16pin IC9003_98 H:SOS
15P5V SOS —-(R9048 in Dboard) IC9003_93 L:SOS
6SCAN Driver SOS(37”,42”)
+SC Floating Volt. (50”) D20 or SC20 /11 pin IC900392 H:SOS
7SC Floating Volt.(37”,42”)
DATA Driver SOS (50”)
D20 or SC20 /12pin (37”/42”)
SS44 or C44 /19pin (50”) IC900399 H:SOS
8SUS Driver SOS SS23 or C23 /9pin (37”) SS32 or C32 /9pin (42”)
SS44 or C44 /9pin (50”)
IC900397 H:SOS
Panel SOS LED 1-8 times blink <TH-37/42PA50E,PE50B>
Panel SOS LED 1-8 times blink <TH-37/42PV500E,B>
SC Board DBoard

Protection FAN SOS LED 11 times blink
PB Board DG Board
Sound SOS LED 12 times blink

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
50series
@
|STB 5V|
FUSE
1,4k/'!>-10-10
0MICOM
IC9003
D
3
1
2
1—I
DG
MICOM
IC1104
DG|
3
12
DG
2
14
[H]
HH
253
27 ?
i]
HH
251
27 33
Check Point Location e.g. 42PV500E,B
K
Power
2-LED
K
—Power
2*LED

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 @
•-*
IC1104 —
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 <37”,42” SD (TH-37/42PA50E,PE50B) >
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 ,
>-fr|SC Board] (*3) The reason of disconnect SC20 is to prevent 6times SOS
caused by disconnect D33 and D34.
SS Board
(*4)Check one of the following 1C.
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
Check Point Location