Panasonic GPH11DU Troubleshooting Handbook

Technical Guide

Troubleshooting Handbook

Model : TH-42PZ80U

TH-46PZ80U TH-50PZ80U TH-42PZ85U TH-46PZ85U TH-50PZ85U

TH-42PZ800U

Plasma

(GPH11DU Chassis)

HD Models

TH-46PZ800U TH-50PZ800U TH-46PZ850U TH-50PZ850U

Panasonic Technology and Service Company

National Training

This page is purposely left blank.

2

Table of Contents

Subject Page

Connector’s Location (TH-42PX80U) Power LED’s Response to Shutdown Operation LED blinks 1 time LED blinks 2 times LED blinks 3 times LED blinks 4 times LED blinks 5 times (Quick Troubleshooting) LED blinks 5 times LED blinks 6 times SU/SD Board Isolation Procedure LED blinks 7 times LED blinks 8 times LED blinks 9 times LED blinks 10 times before pressing the power button LED blinks 10 times after pressing the power button LED blinks 11 times LED blinks 12 times

5 7 8 9-11 12 13 14 15 - 18 19 20 21 23 24 25 - 27 28 - 29 30 31

Subject

No Sound Troubleshooting for Picture Problems Diagnostic Method for Troubleshooting PDP

Television Troubleshooting for Picture Trouble

Diagnosis for Picture Problem (All Over the Screen) Diagnosis of Vertical Line Problem Picture Trouble at Upper or Lower half Picture Trouble at Right or Left half (50 Inch) Picture Trouble at Right or Left half (42/37 Inch) Picture Trouble in 50 Inch Models Picture Trouble all Over the Screen Examples of Symptoms and Remedies Self-check Procedure Reset Driver Setup Adjustment

Page

35 38 39

40 42 43 44 45 46 47 48 50 56 56 57

LED blinks 13 times No Power / Dead

32 33 - 34

3

Introduction

1. Basic concept of how to determine the defective board

1) Verification of voltages Normally, when there is a power problem, shutdown occurs immediately. So, to resolve a power problem, voltage checks are necessary before shutdown.

2) Check if the power comes up after disconnecting the board under suspicion.

If power comes up (*) after disconnecting a board, the board is defective. (*) “Power comes up” equals “no shutdown”.

2. Troubleshooting Video and Audio problems

3. Examples of video problems

4. Adjustment after PCB exchange

1) After exchanging the following boards, voltage adjustment is required. P board, SC board, SS board => Please refer to the “Service Manual”.

4

Connector’s Location (TH-42PZ85U)

Figure 1

5

1. Troubleshooting Shutdown Problems

CAUTION: Some steps requires removal of connectors and

sometimes PC boards removal. Do not let the TV run for more than 30 seconds while connectors or boards are disconnected.

6

Power LED’s Response to Shutdown Operation

Number of blinks Contents Check point

Communication Error with

1

2 15V SOS D

3 3.3V SOS D

4 Power Supply SOS P

5 5V SOS D

Microcomputer

D, A

6

7

8

9

10

11 Fan SOS PB, A

12 Sound SOS A

13

SC Energy recovery SOS

SC floating voltage SOS

SS Energy recovery SOS

Panel Configuration SOS

Sub 5V SOS, Main 3.3V SOS, DTV9V

SOS, Tuner SOS

Communication Error with Peaks

Lite-2

SC, D, P

SC, SU, SD, D, P

SS, D, P

D

A

7

LED blinks 1 time

Trouble Mode

Communication Error

TH-42PZ80/85/800U TH-46PZ80/85/800U TH-50PZ80/85/800U

Disconnect A52 on the A Board (See Figure 1). Plug in the TV and turn it on

No Yes

Replace the GS

board

Defective Board

D, GS, A

TH-46PZ850U TH-50PZ850U

Disconnect A9 on the A Board. Plug in the TV and turn it on

Is the power

LED still

blinking?

Unplug the TV and disconnect connectors P6 and P7 on the P Board (See Figure 1). Plug in the TV.

Warning: Disconnect AC Power prior t o making any disconnection or connection

A board Connectors Location

Replace the D

board

No

Is the TV turning on by itself with the following

conditions?

Power LED = Off

SC LED= On

SS LED = ON

Figure 2

Yes

Replace the A

board

8

LED blinks 2 times

Trouble Mode

15V down SOS

Defective Board (Possibility)

P, A, SC, SS Board (P > A, SC, SS)

P15V Distribution

2 Blinks Condition can be caused by:

• Missing P15V

• A short of the P15V

• Wrong diagnostic by the D board

Figure 3

9

LED blinks 2 times

Trouble Mode

15V down SOS

Plug in the TV and turn it on. Measure the voltage at pin 1 of connector P7

No

Replace

The P board

Is there

15V

present?

Defective Board (Possibility)

P, A, D, SC, SS, PB Board (P > A, SC, SS, PB)

Unplug the TV and check the resistance between pin 1 of connector P7 and ground (Chassis)

Yes

Replace

The D board

Is there a

short

circuit?

Reconnect P12 and measure the resistance between pin 1 of connector P7 and ground (Chassis)

YesNo

Warning: Disconnect AC Power prior t o

making any disconnection or connection

Unplug connectors P6, P7, P12, and P25 on the P board. Measure the resistance between pin 1 of connector P7 and ground (Chassis)

No

Is there a

short

circuit?

Yes

Replace

The P board

Reconnect P25 and measure the resistance between pin 1 of connector P7 and ground (Chassis)

No

Go to the

Next slide (A)

Is there a

short

circuit?

Yes

No

Disconnect SC20 on the SC board and measure the resistance between pin 1 of connector P7 and ground (Chassis

10

Is there a

short

circuit?

Yes

Replace

The SS board

Go to the

Next slide (B)

Continue from the

previous slide (A)

Reconnect P6 and measure the resistance between pin 1 of connector P7 and ground (Chassis

Continue from the

previous slide (B)

No

Is there a

short

circuit?

Yes

No

Is there a

short

circuit?

Is there a

short

circuit?

No

Reconnect P7 and measure the resistance between pin 1 of connector P7 and ground (Chassis)

Replace

The D board

Yes

Replace

The A board

Disconnect PB30 on the PB board and measure the resistance between pin 1 of connector P7 and ground (Chassis)

No

The SC board

Is there a

short

circuit?

Replace

Yes

Replace

The D board

Replace

The PB board

Replace

The A board

11

LED blinks 3 times

Trouble Mode

3.3V down SOS

Defective Board

D Board

Replace the D board

Warning: Disconnect AC Power prior t o making any disconnection or connection

12

LED blinks 4 times

Trouble Mode

Power Supply SOS

Primarily P board followed by D board

Defective Board

4 blinks condition can be caused by:

An abnormal increase in any of the voltages generated by the power supply (Vsus, Vda, P15V, P5V, STB5V)

Warning: Disconnect AC Power prior t o

making any disconnection or connection

Turn the TV on.

Is pin

Yes No

12 of CN P25

on the P

board high

before the TV

shuts down?

13

D BoardP Board

LED blinks 5 times

Trouble Mode

5V SOS

Defective Board

P, D, Cs, SC, SD, SS, D board or Panel

P5V and Vda Distribution

Warning: Disconnect AC Power prior to making any

disconnection or connection

5 blinks condition can be caused by:

• Missing P5V

• A short of the P5V

• A short of the Vda line (Note: missing

Vda from the P board does not cause 5 blinks)

• Wrong diagnostic by the D board

Figure 4

14

LED blinks 5 times (Quick Troubleshooting)

Trouble Mode

5V SOS

Defective Board

P, D, Cs, SC, SS, D board or Panel

Disconnect the TV. Measure the resistance

between pin 1 of connector P12 on the P

board and ground (Chassis).

Yes

Panel

Is there a

short to

ground?

No

Warning: Disconnect AC Power prior to making any

disconnection or connection

Proceed to more extensive troubleshooting

of the slides that follow.

Note: Even though it

does not happen often,

the 5 blinks shutdown can also be caused by

one of the C boards

15

LED blinks 5 times

Trouble Mode

5V SOS

Replace

the P board

Yes

Defective Board

Warning: Disconnect AC Power prior to making any

disconnection or connection

P, C, SC, SS,SD, D board or Panel

Use a volt-meter and place the positive probe on pin 5 of connector P25 on the P board

while the negative probe is grounded. Plug in the TV and turn it on

Yes No

Replace

the D board

Is

there

5V?

Disconnect the TV and measure the

resistance between pin 5 of connector P25 on

the P board and ground (Chassis).

Yes

Disconnect P25 on the P board. Measure the

resistance between pin 5 of connector P25 on

the P board and ground (Chassis).

Reconnect P25 and disconnect SC20 on

Is there a

short to

ground?

No

the SC board. Measure the resistance

between pin 5 of connector P25 on the P

board and ground (Chassis).

Yes No

Is there a

short to

ground?

No

Is there a

short to

ground?

Replace

the P board

Reconnect SC20 and disconnect SS33 on the SS board.

Measure the resistance between pin 5 of connector P25 on

the P board and ground (Chassis).

Go to the

next slide (A)

Yes

Is there a

short to

ground?

No

Replace

the SS board

Replace

the SC board

16

Yes

Is there a

short to

ground?

Disconnect SC46 and reconnect

SC20 on the SC board. Measure

the resistance between pin 5 of

connector P25 on the P board and

ground Chassis).

No

Replace

the SD board

Continue from the

previous slide (A)

Reconnect SS33 and disconnect D31, D32, and D33 on the

D board (To get to this connectors, remove the A Board

Block Assembly). Measure the resistance between pin 5 of

connector P25 on the P board and ground (Chassis).

LED blinks 5 times

Yes No

Replace

the D board

Reconnect D31 and D32 only. Measure the resistance

between pin 5 of connector P25 on the P board and

Yes

Disconnect the Flex cables between the panel and the C1

board (CB1~CB8). Measure the resistance between pin 5

of connector P25 on the P board and ground (Chassis).

Yes

Replace

the C1 board

Is there a

short to

ground?

ground (Chassis).

Is there a

short to

ground?

Is there a

short to

ground?

TH-42PZ80/85U

No

TH-46PZ80/85U

TH-50PZ80/85U TH-46PZ800/850U TH-50PZ800/850U

Replace

the Panel

Figure 5

Reconnect D33 and disconnect the Flex cables between

the panel and the C2 board (CB9~CB15). Measure the

resistance between pin 5 of connector P25 on the P

board and ground (Chassis).

No

Is there a

short to

ground?

Yes

Replace

the C2 board

TH-42PZ85U

Go to the

next slide (B)

17

Reconnect D31 only. Measure the resistance between pin

Disconnect the Flex

cables between the

panel and the C1 board

(CB1~CB6). Measure

the resistance between

pin 5 of connector P25

on the P board and

ground (Chassis).

LED blinks 5 times

5 of connector P25 on the P board and ground (Chassis).

Yes

Is there a

short to

ground?

No

Continue from the

previous slide (B)

Reconnect D32 and D33 and disconnect C26 on the C2

board. Also disconnect the Flex cables between the panel

and the C2 board (CB7~CB11). Measure the resistance

between pin 5 of connector P25 on the P board and

ground (Chassis).

Replace

the C1 board

Yes

Is there a

short to

ground?

No

Replace

the Panel

Replace

the C3 board

Yes

Is there a

short to

ground?

18

Yes No

Replace

the C2 board

Reconnect C26 and the Flex-cables between the panel and the C2 board. Disconnect the Flex cables between

the panel and the C3 board (CB12~CB15). Measure the

resistance between pin 5 of connector P25 on the P

board and ground (Chassis).

Is there a

short to

ground?

No

Replace

the Panel

LED blinks 6 times

Trouble Mode

SC Energy Recovery SOS

Replace

the SC board

Defective Board (Possibility)

SC, P Board (SC >D> P )

Disconnect

connectors SC2, and SC20

from the SC board. Plug in

the TV and turn it on.

Yes No

Does the

TV power

up and

stay on?

Warning: Disconnect AC Power prior to making any disconnection or connection

(*2) CAUTION: Before connecting P2/SC2 or

P11/SS11, discharg e is ne ce ssary to prev e nt potential shock caused by VSUS.

Connect SC2 (*2) and

SC20. Plug in the TV

and turn it on.

Clean and reseat the ribbon

cables between the D and the C

boards. Also reseat the cables

between the C boards. If

problem persists, replace the D

board

Yes

Does the P

board output

15V at pin 1 of

P7 and Vsus at

pin 1 of CN P2

before the TV

shuts down?

19

No

Replace

the P board

SU/SD Board Isolation Procedure

Unlike previous models of Panasonic Plasma TVs, the 2008 models are designed not to turn-on if either of the SU and SD boards is disconnected. Disconnecting either causes the unit to shutdown and the power LED to bli nk 7 times.

Procedure to isolate the SU/SD board

For SU board: Disconnect connectors SC41/SU41, SU11/SD11.

For SD board: SU11/SD11.

Isolating the SU/SD board does not require the removal of its mounting screws.

Place a jumper between “VF Ground” (labeled H.V. DANGER) on the SU board or SD board and coil L801 on the SC board, see figure 6 and 7.

The jumper can be connected to the floating grou nd screws on the SU board, which are located above and below connector SU41, see figure 2.

Caution: Before turning the unit on, confirm that the jumper is not

connected to a chassis ground screw, as this will cause s evere damage to the unit. Confirm proper connection by measuring continuity between floating ground and chassis ground. The resistance should be in the kilo-ohms range.

Disconnect connectors SC42/SD42, SC46/SD46, and

Figure 6

Figure 7

20

LED blinks 7 times

Trouble Mode

SC Floating voltage SOS

Make sure connectors P2/SC2, SC20/D20 are not loose and are seated properly.

Reconnect the SD board only.

(See instructions on previous slide).

Plug in the TV and turn it on.

Does the

TV shut down

and the power

LED

blink 7 times?

Replace the SU board.

Note: The panel can possibly cause the SU board to become damaged

Defective Board (possibility)

SC, SU, SD, D, P board (SC,SU,SD>P)

YesNo

Disconnect the SD board and

reconnect the SU board. (See

instructions on previous slide).

Plug in the TV and turn it on.

No

Does the

TV shut down

and the power

LED

blink 7 times?

Physically disconnect the SU board and the

SD board. (See instructions on previous

slide). Plug in the TV a nd turn it on.

Yes

Replace the SC board.

With the SU board and the SD board

still disconnected, remove connectors

SC2 and SC20 from the SC board.

Plug in the TV and turn it on.

No

Does the

TV shut down

and the power

LED

blink 7 times?

Replace the D board.

Yes

Replace the SD board.

Note: The panel can possibly cause the SD board to become damaged

Does the

TV shut down

and the power

LED

blink 7 times?

YesNo

Replace the SD, and SU board.

Note: The panel can possibly cause the SD and SU boards to become damaged

21

D16280 (D280) Location

N 2.7V SOS

To pin 66 IC9003

PANEL

Note: The location for this component may not be the same for all models

TH-42PZ85U

Figure 8

Anode

D16280

(D280)

Figure 9

Figure 10

22

LED blinks 8 times

Trouble Mode

SS Energy recovery SOS/Panel

Disconnect the TV. Use a volt-meter and place the positive

probe on the anode of D280 on the SS board (See previous

slide for location), while the negative probe is grounded. Plug

in the TV and turn it on

Defective Board (possibility)

SS, D board (SS>,D)/PDP

Disconnect

connector SS33 from the

SS board. Plug in the TV

and turn it on

Yes

Does the

TV power

up and

stay on?

Warning: Disconnect AC Power prior to making any disconnection or connection

No

Replace

the D board

Replace

the panel

Yes

Is there approx. 2.7V at the anode

of D280 on

the SS

board?

23

No

Replace

the SS board

LED blinks 9 times

Trouble Mode

Panel Status

Defective Board

D Board

Replace the D board.

Warning: Disconnect AC Power prior to making any disconnection or connection

24

The power LED blinks 10 times at plug-in

Trouble Mode

Dead/No power

Defective Board (Possibility)

P, A, GS, K, GH

Sub-Voltages Distribution Diagram

10 blinks condition can be caused by:

• Missing/Shorted F_STB_15V

• Missing/Shorted SUB9V, SUB5V, and SUB3.3V

• Wrong diagnostic by the A board

A board Connectors Location

Figure 11 Figure 12

25

The power LED blinks 10 times at plug-in

Trouble Mode

Dead/No power

Warning: Disconnect AC Power prior to making any

disconnection or connection

Unplug the TV. Using a voltmeter, place the positive

probe at pin 6 of connector P7 while the negative probe is

Defective Board (Possibility)

P, A, GS, K, GH

grounded. Plug in the TV

Unplug the TV and

disconnect connector A1 on

the A board. Plug in the TV

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.

NO

seconds when the TV is plugged

Is there 3.2V

present for a couple of

into the AC

line?

Do the AC relays

click after the TV is plugged

into the AC line?

Yes

Replace

The P board

Yes

Replace

The A board

NO

Do the AC relays

click after the TV is plugged

into the AC line?

Yes

If cable between connectors K1

and A1 is OK, Replace the K board.

26

Go to the Next slide

The power LED blinks 10 times at plug-in

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: Disconnect AC Power prior to making any disconnection or connection

Unplug the TV and disconnect

connector P6 on the P board. Using a voltmeter,

place the positive probe at pin 7 of connector P6

while the negative probe is grounded. Plug in the TV

No

Replace

The P board

Is there 15V

present when the TV

is plugged into the

AC line?

Yes

Replace

The A board

No

pin 7 of connector P6/A6 when

the TV is plugged into

Is

there 15V at

the AC line?

Unplug the TV. Reconnect

connector A1 only.

Plug in the TV

No

Does the

power LED

blink 10 times?

Yes

Continue from the

previous slide

Unplug the TV. Disconnect

connectors A1, GS52, and

GH11 on the A board.

Plug in the TV

No

Does the

power LED

still blink

10 times?

Yes

Replace

The A board

Replace the

GH board.

No

Does the

power LED

blink 10 times?

Unplug the TV.

Reconnect

connector A52 and

leave connector GH11

disconnected.

Plug in the TV

Yes

Replace the

GS board.

27

Replace

the K board.

LED blinks 10 times after pressing the power button

Trouble Mode

SUB 5V SOS, Main 3.3V SOS DTV 9V SOS, Tuner Power SOS

Disconnect connectors SC2 and SC20 on the Scan (SC) board. Plug in the TV and turn it on.

No Yes

Replace

The SC board

Does the unit shut

down and the

power LED blinks

10 times?

Unplug the TV and re-connect CN SS11 (*2), SS33 and CN SS34 on the SS board and CN P12 on the P board. Measure Vsus (*3) at pin 1 of CN P11 and Vda (Approx. 75V) at pin 1 of CN P12. Plug in the TV and turn it on.

Defective Board

P, A, SC,SS, GS, G Board

Unplug the TV and re-connect CN SC2(*2), and SC20 on the SC board. Disconnect CN SS11(*2), SS33, and SS34 (*4) on the SS board and CN P12 of the P board. Install the jumper from SS34 between pin 8 and 10 of CN P12. Plug in the TV and turn it on.

No

Warning: Disconnect AC Power prior to making any

disconnection or connection

(*2) CAUTION: Before connecting P2/SC2 or

P11/SS11, discharg e is ne ce ssary to prev e nt potential shock caused by VSUS.

(*3) VSUS about 180V (Accurate voltage is provided

on the Panel Label)

(*4) Place a jumper across pin 8 and 10 of connector

P12. The unit will not enter the standby mode without the jumper.

Does the power

LED stay on

when the TV is

turned on?

Yes

Replace

The SS board

Note: CN = Connector

Replace

The A board

Are

any of these

voltages

missing?

28

YesNo

Replace

The P board

LED blinks 11 times

Trouble Mode

Fan SOS

Defective Board (Possibility)

Fans, PB, A Board

Fan SOS Circuit

Warning: Disconnect AC Power prior to making any

disconnection or connection

11 blinks condition happens:

1. If one of the fans opens or

increases resistance.

2. If the PB board becomes

defective triggering shutdown.

3. If the CPU in the A board

gives a wrong diagnostic triggering shutdown

Figure 13

29

LED blinks 11 times

Trouble Mode

Fan SOS

Unplug the TV and disconnect connector PB30 on the PB board. Plug in the TV and turn it on.

Defective Board (Possibility)

Fans, PB, A Board

Unplug the TV and disconnect the fans, one at a time. (See caution (*5)). Plug in the TV and turn it on.

No

Does the power

LED stay on

when the TV is

turned on?

Warning: Disconnect AC Power prior to making any disconnection or connection

Caution (*5) When a fans is disconnected, place a jumper between pins 2 and 3 of the connector that the fan was removed from.

Yes

Replace the Fan.

Replace

The A board

No

Does the TV

stay on for

more than 30

seconds

when the TV

is turned on?

30

Yes

Replace

The PB board

LED blinks 12 times

Trouble Mode

Sound SOS

Unplug the TV and disconnect connectors P6 and P7 on the P board. Plug in the TV

Defective Board (Possibility)

Speakers, A Board

Unplug the TV and disconnect the Left and Right speakers connectors. Plug in the TV and turn it on

No

Does the power

LED stay on

when the TV is

turned on?

Warning: Disconnect AC Power prior to making any disconnection or connection

Yes

Check the speakers and

the speaker’s wires.

Check P15V (Pin 1 of P6) and

follow 2 blinks instructions

No Yes

Is the TV turning on by

itself at plug in with:

Power LED = Off. LED on SS board = On. LED on SC board = On

31

Replace

The A board

LED blinks 13 times

Trouble Mode

Communication error with IC8001

TH-42PZ80/85/800U TH-46PZ80/85/800U TH-50PZ80/85/800U

Disconnect A52 on the A Board (See Figure 1). Plug in the TV and turn it on

No Yes

Replace the GS

board

Is the power

LED still

blinking?

Unplug the TV and disconnect connectors P6 and P7 on the P Board (See Figure 1). Plug in the TV.

Defective Board

A Board

TH-46PZ850U TH-50PZ850U

Disconnect A9 on the A Board. Plug in the TV and turn it on

Warning: Disconnect AC Power prior to making any disconnection or connection

A board Connectors Location

Replace the D

board

No

Is the TV turning on by itself with the following

conditions?

Power LED = Off

SC LED= On

SS LED = ON

Figure 14

Yes

Replace the A

board

32

Trouble Mode

Dead/No power

No Power/Dead Unit

Defective Board (Possibility)

P, A, GS, K

Warning: Disconnect AC

Power prior to maki ng any disconnection or connection

Yes

Is there 5V present

when the TV is plugged into

the AC line?

Yes

Disconnect connector A7. Place your

volt-meter on pin 5 of connector P7.

Is there continuity

between pins 8 and

10 of connector

P12 of the P

board?

Plug in the TV and turn it on.

Yes

NO

Unplug the TV and place your

volt-meter on pin 5 of

connector P7. Plug in the TV.

NO

Unplug the TV

NO

Is there 5V when the

TV is plugged in?

NO

Check connection between P12 and SS12. Also check for missing jumper on SS34 on the SS board. If jumper on connector SS34 is present, replace the SS board.

NO

Yes

Do the AC relays

click after the TV is plugged

into the AC line?

Place your volt-meter on pin 9 of connector A1. Press the power switch

Does

pin 9 of connector

A1 go from 4.5V to 0V while the

power button on the TV is

pressed?

Yes

Unplug the TV and place your volt-meter

on pin 11 of connector P25 or A25. Plug

in the TV and press the power switch

NO

Is there 3.2V

present when

the power

button is

pressed?

Yes

Go to the Next slide

Replace

The P board

Replace

The A board

If wiring connections

are ok, check

the S & K boards.

33

Replace

The A board

Replace

The P board

Continue from

Previous slide

No Power/Dead Unit (Continue)

Unplug the TV and place your

volt-meter on pin 6 of

connector P7. Plug in the TV.

NO

TH-42PZ80/85U TH-46PZ80/85U TH-50PZ80/85U

TH-42PZ800U TH-46PZ800U TH-50PZ800U

TH-46PZ850U TH-50PZ850U

NO Yes

Replace

The A board

Do the AC

relays click after

the TV is plugged into

the AC line?

Reconnect A1 and

disconnect connector

A52. Plug in the TV.

Reconnect A1 and

disconnect connector

A9. Plug in the TV.

Do the AC

relays click after

the TV is plugged into

the AC line?

Unplug the TV and

disconnect

connector A1. Plug in

the TV.

Yes

Replace

The G board

Is

NO Yes

there 3.2Vor 2.7V at

pin 6 of connector P7 when the

TV is plugged into

the AC line?

If the cable between connectors K1 and A1 is OK, Replace the K board.

If the cable between connectors GS09

and A9 is OK, Replace the GS board.

Replace

The A board

Reconnect A52 and

disconnect connector

A51. Plug in the TV.

Reconnect A9 and

disconnect connector

TH-42PZ80/85U TH-46PZ80/85U TH-50PZ80/85U

TH-42PZ800U TH-46PZ800U TH-50PZ800U

TH-46PZ850U TH-50PZ850U

A51. Plug in the TV.

Replace

The P board

Do the AC

NO

relays click after

the TV is plugged into

the AC line?

If the cable between connectors GS52

and A52 is OK, Replace the GS board.

TH-42PZ800U TH-46PZ800/850U TH-50PZ800/850U

Yes

TH-42PZ80/85U TH-46PZ80/85U TH-50PZ80/85U

34

No Sound

Warning: Disconnect AC Power prior to making any disconnection or connection

Check the cable

between connector

A7 on the A board

and P6 on the P

board.

No

Is there 15V at pin 1 of CN A6

on the A

board?

Yes

Is there a sound

waveform at pin 1

and 3 of CN A12

on the A board?

No

Check the speakers.

(Make sure A12 is

properly seated).

35

Replace

The A board

This page is purposely left blank.

36

Troubleshooting for Picture Problems

37

Diagnostic Method for Troubleshooting PDP Television

1. There are two kinds of picture problem

1) Abnormal picture

2) No picture

2. Basic concept of determining the defective board

1) Which area is the symptom displayed on the screen? A. Part of the screen B. All over the screen

3. Adjustment after PCB exchange

1) After exchanging the following boards, voltage adjustment is required.

P board, SC board, SS board => Please refer to “Service Manual”.

38

Troubleshooting for Picture Trouble

Start

Some part of the screen

Where is

the symptom

displayed?

Upper or Lower half

(from front view)

Left or Right half

(from front view)

Upper half

Lower half

Both area

Right half

Left half

SU Board (or D, or SC)

SD Board (or D, or SC)

SC Board (or D)

D Board (or C1, or Panel)

D Board (or C2, or Panel)

*Note :Panel gas leakage

Because of a very small crack in the panel, gas leakage will start. In this picture, gas leakage started at the left top corner. Finally, gas leakage will lead to the symptom “No picture with buzz

noise”.

39

Diagnosis for Picture Problem (All Over the Screen)

Abnormal Color, Vertical Line, Sync Error, Noise Picture

D Board, SC Board, SU Board, SD Board

e.g. TH-42PZ80U

IC1100

PROCESSOR

IC4510

MICRO

A

IC9500

PICTURE OUTPUT

IC9900

PLASMA AI

<Model>

All Models

SC SS

SU

SD

Buffer IC Buffer IC

HDMI I/F

Peaks

Lite

IC8001

LVDS

RECEIVER

DISCHARGE

CONTROL

S.F. PROCESSOR

Scan Control Pulse

Sustain Control Pulse

40

DATA

DRIVER

Video DATA (R)

Video DATA (L)

Diagnosis for Picture Problem (All Over the Screen)

Confirm the waveform at “TPSC1” of the SC board

Waveform OK

Correct Waveform

<Cause>

D Board defect

D

Video/Panel

Control

PLASMA AI

IC9300 IC9400

IC9500

DISCHARGE

CONTROL

Waveform NG

<Cause>

TPSC1

SC SS

Sample of NG Waveform

Here

SC,SU,SD Board defect

Refer to “Diagnosis (3)” on next page

SU

SD

Buffer IC Buffer IC

DATA

DRIVER

Scan Control Pulse

Sustain Control Pulse

41

Video DATA (R)

Panel Drive Circuit

Video DATA (L)

Diagnosis for Picture Problem (All Over the Screen)

Confirm the waveform at “TPSC1” after removing the SU or SD Board from the SC Board

Situation

Disconnect SU Board

(Connect SD)

Disconnect SD Board

(Connect SU)

Disconnect the SU

and SD Boards

Correct Waveform

Condition

Condition 2

Bottom half of

Waveform OK?

Picture OK?

Upper half of

Waveform OK? SD Board

Picture OK?

Screen should

Waveform OK? SC Board

be black

SC SS

TPSC1

SU

SD

Cause

SU Board

42

Buffer IC Buffer IC

Diagnosis of Vertical Line Problem

NG Area (Front view)

Panel

case1

IC IC IC IC

Buffer IC Buffer IC

C2

C1

Buffer

case2

Drive IC(2)

inside

case1 case2

Thin vertical line

or 1 block not lighting

PDP panel (Driver IC) NG

D board (or C board) NG

( or D board, or C board )

1 Line

Buffer

1 Block 2 Blocks

PDP PanelPDP Panel

D-board ( or C-board)

Driver IC

C Board

Driver IC Driver IC Driver IC

FPC

A number of blocks not lighting

FPC

C Board

Buffer

43

Buffer

or

D boardD Board

Picture Trouble at Upper or Lower half

No Picture, Picture noise, Full Horizontal line, etc.

42 inch (HD Panel)

(Front view)

1

SS

2

SU

SC

SD

D

Symptom Result

: Horizontal line (Lower side) : SD board

: Horizontal line (Upper side) : D board

C1C2

Trouble at Upper half : SU-board (SC or D) defect

1

Trouble at Lower half : SD-board (SC or D) defect

2

Full Horizontal line at both area : SS-board (D) defect

(*)

44

Symptom Result

: Horizontal line (Both area) : SS board

Picture Trouble at Right or Left half (50 Inch)

No Picture, Picture noise, etc.

50inch (HD Panel)

(Front view)

SS2

SS

SS3

2

1

SU

SD

SC

D

Symptom Result

: Cyan noise (Right side) : D board

C3

C2

C1

Trouble at Right half : D-board defect

1

Trouble at Left half : D-board defect

2

45

Picture Trouble at Right or Left half (42 Inch)

No Picture, Picture noise, Full Vertical line, etc.

42 inch (HD Panel)

(Front view)

SU

SS

12

SD

SC

C1C2

D

Symptom Result

: Vertical line : Panel

Trouble at Right half : D or C1 board (Panel) defect

1

Trouble at Left half : D or C2 board (Panel) defect

2

46

Picture Trouble in 50 Inch Models

No Picture, Picture noise, Half Vertical line, etc.

50inch (HD Panel)

(Front view)

SS2

SU

SS

3

12

SC

D

Trouble at Upper right :

1

C1 board or Panel defect

Trouble at Upper middle :

2

C2 board or Panel defect

SS3

C3

C2

C1

SD

47

Trouble at Upper left :

3

C3 board or Panel defect

Picture Trouble all Over the Screen

Picture noise, Full Vertical line, etc.

42inch (HD Panel)

<NG Area

(e.g. 42 inch Panel)>

(Front view)

SS

1

C1C2

SU

SD

SC

D

Symptom Result

: Vertical line (All over screen)

: D board

: White balance NG : D board

: Abnormal Picture : SC board

Trouble at All area : D or SC board

1

(SU,SD) defect

48

Examples of Symptoms and Remedies

49

Picture Problem (All over the screen)

<Symptom> Noise Picture <Photo of Symptom>

Model : 42 inch Result : A Board Model : 42 inch

Result : D Board

Model : 42 inch Result : D Board

Model : 42 inch Result : A Board

Model : 42 inch Result : SC Board

50

Model : 42 inch Result : SC Board

Picture Problem (All over the screen)

<Symptom> Vertical Line <Photo of Symptom>

Model : 42 inch Result : D Board

Model : 42 inch Result :D Board

Model : 42 inch Result : D Board

Model : 42 inch Result : SC Board

Model : 42 inch Result : D Board

Model : 42 inch Result : SD Board

51

Model : 42 inch Result : D Board

Model : 42 inch Result : SD Board

Picture Problem (All over the screen)

<Symptom> Abnormal Color, White Balance NG <Photo of Symptom>

Model : 42 inch Result : D Board

MagentaMagentaYellow

Model : 42 inch Result : D Board

Model : 42inch Result : D Board

Model : 42 inch Result : D Board

Blue Abnormal ColorGreen

Model : 42 inch Result : D Board

CyanRedRed

Model : 42 inch Result : D Board

52

Picture Problem (All over the screen)

<Symptom> Sync Error <Photo of Symptom>

Model : 42 inch Result : D Board

53

Picture Problem (Right half or Left half)

<Symptom> Vertical Line <Photo of Symptom>

Model : 50 inch Result : D Board

Model : 42 inch Result : D Board

54

Picture Problem (Upper or Bottom)

<Symptom> Vertical Line <Photo of Symptom>

Model : 42 inch Result : D Board

Model : 42 inch Result : SU Board

Model : 42 inch Result : SS Board

Model : 42 inch Result : D Board

Model : 42 inch Result : SU Board

55

Model : 42 inch Result : SC Board

Self-check Procedure

CHASSIS: GPH11D

All models

How to access the self-check screen to reset the unit.

Select a television channel, and while pressing the [VOLUME ( - )] button on the main unit, press the [OK] button on the remote control for more than 3 seconds.

How to Exit the self-check screen

Press and hold the Power button on

the TV for 5 seconds or disconnect the

AC cord from the wall outlet.

NOTE: This procedure does

not reset the TV

Self-check Screen

TV volume down & OK on remote only does a basic IC self check. It does NOT Reset the TV.

It does not clear channel programmed settings, picture settings, channel labels, LOCK mode settings, or password. Using this method, it shows the unit firmware version (Peaks 1.050 and GenX 1.00) and it checks IC communications ONLY. This is more useful to identify the firmware version without having to decode the info in the setup menu About/Version screen.

56

Reset Procedure

CHASSIS: GPH11D

All models

To Reset the Unit, turn the TV on and while pressing the “VOLUME ( - )” button on

the main unit, press the “Menu” button on the remote control for more than 3 seconds. The Self-Check menu appears on screen. Then, disconnect the AC cord from the wall outlet.

Note: All customer programmed parameters will be erased.

57

Panasonic GPH11DU Troubleshooting Handbook

Specifications and Main Features

Frequently Asked Questions

User Manual