Panasonic Viera TC-P50ST50 User manual

National Training Department
Panasonic Consumer Marketing
Company Of North America
2012 Plasma TV Troubleshooting Guide
2012-Plasma FHD TV – ST Series (15th Generation)
TC-P50ST50
TC-P50UT50
Applies to models:
TTG120313CP120417

Important Information
• To avoid the unnecessary replacement of multiple PC boards, please read this before
beginning to repair this unit.
• Do not use any service documentation other than the one designed for this particular model.
• Techniques used on previous models may not necessarily apply to the model you are
working on.
• For accurate diagnosis during troubleshooting, do not skip or alter the order of steps on the
guide.
Slide 2

When an abnormality occurs in the unit, the “SOS Detect” circuit is triggered and the TV shuts down.
The power LED on the front panel will flash a pattern indicating the circuit that has failed.
Cautions:
If the power LED continues to blink even after the TV is unplugged, press and hold the power switch
on the TV for a few seconds until the LED turns off.
Some steps require removal of connectors and sometimes PC boards removal. Do not allow the TV to
run for more than 30 seconds while connectors or boards are disconnected.
NOTE: When taking voltage reading, place your meter’s probe on the test point or pin indicated before
connecting the TV to the AC line. The voltage you intent to measure may only appear for a brief
moment.
Warning: The Vsus line has large capacitors that hold the charge for some time even after the TV has been turned off and
unplugged. When disconnecting P2/SC2 or P11/SS1, bleed the remaining charge of the Vsus before reconnecting the cable.
Use a 500 ohms/ 5W (At least) resistor to discharge the Vsus line before reconnecting P2/SC2 or P11/SS11.
SOS Precautions
Slide 3

Power LED Error Code Definition (1 of 2)
LIST OF BOARDS POSSIBLY CASUSING THE FAILURE
POWER LED
ERROR
CODE CIRCUIT MONITORED CONDITIONS TRIGGERING
THE SHUTDOWN #1 Suspect #2 # 3 Occasionally #4
Not Often
1 BLINK Panel Information SOS
Communication problem A
2 BLINKS P15V form the P board Missing P15V
P15V is not been generated by the P board.
Wrong diagnostic by the A board P A
3 BLINKS Incomplete or interrupted
Boot Program execution of
PEAKS IC (IC8000).
Shorted P15V
Missing F15V
Wrong diagnostic by the A board A P
4 BLINKS Power Supply output
voltages
Vsus Over Voltage Condition.
P15V Shorted while in operation.
Wrong diagnostic by the A board P A
6 BLINKS SC Energy Recovery Circuit
An increase or reduction of the Energy Recovery Circuit
output (MID).
Shorted SUB5V.
Wrong diagnostic by the A board.
SC A C
7 BLINKS Scan Drive Circuit and Connection between the SC
board and the SC board.
Missing or shorted Vsus.
Abnormality of the scan circuit output, the 15V_F, the
scn_pro, and Vscn circuit.
Loose or open Connection between the SC board and the
SC board (SC41, SC42, SC46).
Open or loose connection between connectors SC2/P2
Wrong diagnostic by the A board
Defective panel
SU/SD SC SS A/Panel
8 BLINKS Sustain Drive Circuit and Connection between the SS
board and the Panel.
Abnormality of the sustain drive circuit.
Open or loose connection between the SS/SS2 Boards.
and FPCs from the panel (SS52 – SS54 – SS55– SS57).
Open or loose connection between connectors C10/C20 or
C26/C36.
Wrong diagnostic by the A board
SS A C3 Panel
Slide 4

Power LED Error Code Definition (2 of 2)
LIST OF BOARDS POSSIBLY CASUSING THE FAILURE
POWER LED
ERROR
CODE CIRCUIT MONITORED CONDITIONS TRIGGERING
THE SHUTDOWN #1 Suspect #2 # 3 Occasionally #4
Not Often
9 BLINKS Discharge Control Circuit
DDC (IC9300) Failure of IC9300 Wrong diagnostic by the A board A
10 BLINKS SUB3.3V_Sense (OVP) Over Voltage Condition of SUB5V or SUB3.3V
Wrong diagnostic by the A board. A
12 BLINKS Audio Amp. Circuit Defective Speaker/Subwoofer
Pinched Speaker Wire
Wrong diagnostic by the A board A Speakers/
Subwoofer
13 BLINKS IC8000 Internal
Communication Defective A board A
Slide 5

IC8000-1
Peaks
LD4
Standby
uCOM
System
uCOM
AD15
PANEL_SOS
9
SC_SOS6
12
8
11
SS_SOS8
SOS_DCC_S (9)
SC_SOS7
10
Normal : all input = “L”
(output = “L” )
SSA33
5
A20
3
6
SC
IC9300
N2
(Analog output)
6 – 9 blinks
SC_UHZ 18
179
SC
A20
W3
(If no signal,
Discharge Reset
: 6/8 blinks)
1314 T4
AF16
PDP_DRVRST
A31
55
C
3.3V_DET
DRVRST
(If no 3.3V in C1/C2-PCB,
Discharge Reset
: 6/8 blinks)
D_UHZ
7
AG3
SUB3.3V
AD16
FFC_OFF_DET(6)
TC-P**ST50/UT50
(TNPH0989**)
Protection Circuit Block Diagram 1 of 2 (TC-P50ST50)
A32
1
W28
P3.3V
SOS
2 blinks AE20
Q9201
Q9201
P15V
M28
C24
3 blinks
2 Blinks
if P15 is
missing
3 Fast
Blinks
At plug-in
if SUB3.3
is missing
P15V Missing 2 Blinks
Shorted 3 Blinks
IC5000
REG
(STB3.3V)
RESET
SUB3.3V Missing 3 Blinks
At plug-in
Shorted
P15V
Det. Circuit
SUB3.3V
Det. Circuit
NSOS
Slide 6

Blink Code/Voltage Condition (TC-P50ST50 - TC-P50UT50)
Slide 7
No. of Blinks
Voltage Condition TC-P50UT50 TC-P50ST50
Missing 2 Blinks 2 Blinks
Shorted No power. The LED turns on briefly and then it goes off
immediately 3 Fast Blinks
P15V
Missing 3 Fast Blinks at Plug-in 3 Fast Blinks at Plug-in
Shorted 3 Fast Blinks at Plug-in 3 Fast Blinks at Plug-in
SUB3.3V Over Voltage
Dead. Power LED never
turns on 10 Blinks
Missing 3 Fast Blinks at Plug-in 3 Fast Blinks at Plug-in
Shorted 6 Blinks After 11sec. 6 Blinks After 11sec.
SUB5V Over Voltage
Dead. Power LED never
turns on 10 Blinks

IC8000-2
Peaks
LD4
Standby
uCOM
System
uCOM
STB3.3V
SOS
10 blinks AA15
Q8771
Q8771
SUB3.3V
FAN_SOS H6
ALL_OFF(P_SOS4)
A6
4
PAE15
4 blinks
SUB5V TC-P**ST50/UT50
(TNPH0989**)
SUB3.3V
SOUND_SOS
12blinks
IC4900
Audio
AMP 22 AD19
IC4901
Audio
AMP
22
Normal=“H”
(11blinks)
Emergency : 13 blinks
IROM error : quickly 3 blinks
SUB5V &
SUB3.3V
OV Det.
Circuit
10 Blinks if
SUB5V or
SUB3.3V is
too high
SUB5V Missing 3 Fast
blinks at
plug-in
Shorted 6 blinks
after 11 sec.
Over Voltage 10 blinks
Protection Circuit Block Diagram 2 of 2 (TC-P50ST50)
Slide 8

Troubleshooting 1 -9 -10 - 13 Blinks Failure
When 1, 9, 10, or 13 blinks occur, replace the A board
Blink
Code List of boards likely to cause this symptom
No.1 No.2 No.3 No.4
1A Board
9 Blinks A Board
10 Blinks A Board
13 Blinks A Board
Slide 9

Troubleshooting 2 Blinks Failure (TC-P50ST50)
Yes
Place the positive lead of a voltmeter at pin 13
of connector P6 while the black lead is
connected to ground (Chassis ground). Plug in
the TV and turn it on
No
Does 15V
appears
momentarily
on pin13 of
CN P6?
Start Here
Replace the A
board
Replace the P
board
List of boards likely to cause this
symptom.
Blink
Code No.1 No.2 No.3 No.4
2 Blinks P A
Slide 10
Find information for TC-
P50UT50 on the next slide)