2010 FHD Plasma TV G20 G25 Series Troubleshooting Handbook

Panasonic National TrainingPanasonic Service and Technology Company

TC-P42G25TC-P46G25TC-P50G20TC-P50G25TC-P54G20TC-P54G25

Applies to models:

TTG101013CP

Cover Page

2010 - FHD Plasma TV Troubleshooting Handbook2010- Plasma FHD TV – (13th Generation)

G20 & G25 Series

Table of Content

Slide 2

Topic Page Table of Content 2 SOS Detect (Shutdown) 3 Power LED Error Code Definition and the Failure-Causing-Boards 4 Power LED Error Code Definition 5 Boards Replacement by Blinking Code (G20/G25 Series) 6 Quick Procedure To Check For Short or Low Resistance Condition of the Vsus, Vda, and P15V Lines

7

Quick Procedure To Check For Short or Low Resistance Condition of the Vsus, Vda, and P15V Lines

8

Quick Procedure To Determine the Cause of the Problem if a short or Low Resistance Reading is Found

9


10

Detailed Troubleshooting Procedure for Shorted Vsus 11 Detailed Troubleshooting Procedure for Shorted Vsus 12 Detailed Troubleshooting Procedure for Shorted P15 13 Detailed Troubleshooting Procedure for Shorted P15V 14 Detailed Troubleshooting Procedure for Shorted Vda 15 Detailed Troubleshooting Procedure for Shorted Vda 16 Troubleshooting 1 Blink Failure 17 Troubleshooting 1 Blink Failure 18 Troubleshooting 2 Blinks Failure 19 Troubleshooting 2 Blinks Failure (1 of 2) 20 Troubleshooting 2 Blinks Failure (2 of 2) 21 Troubleshooting 3 Blinks Failure 22 Troubleshooting 3 Blinks Failure (1 of 2) 23 Troubleshooting 3 Blinks Failure (2 of 2) 24 Troubleshooting 4 Blinks Failure 25 Troubleshooting a 4 Blinks Failure (1 of 2) 26 Troubleshooting a 4 Blinks Failure (2 of 2) 27 Troubleshooting 5 Blinks Failure 28 Troubleshooting 5 Blinks Failure (1 of 3) 29 Troubleshooting 5 Blinks Failure (2 of 3) 30 Troubleshooting 5 Blinks Failure (3 of 3) 31

Topic Page Troubleshooting 6 Blinks Failure 32 Troubleshooting 6 Blinks Failure (1 of 2) 33 Troubleshooting 6 Blinks Failure (2 of 2) 34 Troubleshooting 7 Blinks Failure 35 Troubleshooting 7 Blinks Failure (1 o 2) 36 Troubleshooting 7 Blinks Failure (2 o 2) 37 SU-SD boards (Together) Isolation Procedure 38 SU-SD boards (Together) Isolation Procedure 39 SU Board Isolation Procedure 40 SD Board Isolation Procedure 41 Vfo, VSCN-F, & 5V_F Resistance Measurements (SU-SD boards) 42 Vfo, VSCN-F, & 5V_F Resistance Measurements (SU-SD boards) 43 Vfo, VSCN-F, & 5V_F Resistance Measurements (SU-SD boards) 44 Troubleshooting 8 Blinks Failure 45 Troubleshooting 8 Blinks Failure 46 Troubleshooting 8 Blinks Failure 47 Troubleshooting 9 Blinks Failure 48 Troubleshooting 9 Blinks Failure 49 Troubleshooting 10 Blinks Failure 50 Troubleshooting 10 Blinks Failure At Plug in 51 Troubleshooting 10 Blinks Failure 52 Troubleshooting 10 Blinks Failure After Power On 53 Troubleshooting 12 Blinks Failure 54 Troubleshooting 12 Blinks Failure 55 Troubleshooting 12 Blinks Failure 56 Troubleshooting No Power/Dead Unit 57 Troubleshooting No Power/Dead Unit 58 Troubleshooting No Power/Dead Unit 59 TV’s Behavior After Connectors Removal 60 TV’s Behavior After Connectors Removal 61 End 62

SOS Detect (Shutdown)

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.

Slide 58Slide 3

Slide 4

Power LED Error Code Definition and the Failure-Causing- Boards

LIST OF BOARDS POSSIBLY CASUSING THE FAILURE POWER LED ERROR CODE

CIRCUIT MONITORED CONDITIONS TRIGGERING THE SHUTDOWN MOST

COMMON 2ND OCCASIONALLY RARELY

1 BLINLK Panel Information SOS Panel Alarm SOS Communication problem between CPUs on A board. A ¤ ¤ ¤

2 BLINKS P15V form the P board

Missing P15V • P15V is not been generated by the P board. • P15V is been affected by one of the boards it is

connected to (A short circuit of the P15V). Wrong diagnostic by the A board

SC P SS A

3 BLINKS P3.3V from the A board

Missing P3.3V Reasons:

• The A board is not generating the 3.3V • The 3.3V is been affected by one of the C boards

or the Panel (A short circuit of the P3.3V). Wrong diagnostic by the A board

C1 or C2 A Panel ¤

4 BLINKS Power Supply output voltages

Regulation issues with any of the voltages output from the power supply. Wrong diagnostic by the A board

P A ¤ ¤

5 BLINKS P5V from the A board

Missing P5V Reasons:

• The A board is not generating the 5V • The 5V is been affected by the SC, SS, A, or C2

board (A short circuit of the P5V). Wrong diagnostic by the A board

SC,SS C2 A ¤

6 BLINKS SC Energy Recovery Circuit

An increase or reduction of the Energy Recovery Circuit output (MID). Open connection between connector A33 on the A board and SC20 on the SC board. Open connection between any of the ribbon cables on the C boards and the A board. Open connection between the ribbon cable/cables interconnecting the C boards. Wrong diagnostic by the A board.

SC A ¤ C

Slide 5

Power LED Error Code Definition

LIST OF BOARDS POSSIBLY CASUSING THE FAILURE POWER LED ERROR CODE

CIRCUIT MONITORED CONDITIONS TRIGGERING THE SHUTDOWN MOST

COMMON 2ND OCCASIONALLY RARELY

7 BLINKS Scan Drive Circuit and

Connection between the SC board and the SM(SU/SD)

board.

Missing 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 SM(SU/SD) board (SC41, SC42, SC46). Open or loose connection between connectors SC2/P2 Wrong diagnostic by the A board

SC SM Panel+SC+SM A

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 board and FPCs from the panel (SS61, SS64, SS21, SS24 and SS58). Open or loose connection between connectors C10/C20 Wrong diagnostic by the A board

SS Panel A C2

9 BLINKS Discharge Control Circuit (IC9300) Failure of IC9300 A ¤ ¤ ¤

10 BLINKS

Abnormalities of the F+15V. Reasons: • The P board is not generating the F+15V • SUB Voltages are affected by the K board or by

metal object present in the SD card slot.. Shorted Vsus (By the SS board or SC board). Shorted Vda (By the panel, C1, or C2 board) Wrong diagnostic by the A board.

SS SC A - P K

12 BLINKS AUDIO AMP Abnormalities of the Audio AMP A ¤ ¤ ¤

Boards Replacement by Blinking Code (G20/G25 Series)

BlinkCode

List of boards likely to cause the symptom. (Based on Actual Reports and Circuit Operation)

Most Common

2nd 3rd 4th 5th 6th 7th

1 A

2 SC P SS A

3 SC C1 C2 C3 Panel A

4 SC P A SS SD

5 SD SC SS C2 A

6 SC SD A C

7 SC SU SM SD Panel A

8 SS A Panel C2

9 A

10 SC A SD SS SU P K

11 Fan A

12 A Speakers

This part can possibly cause this error code, but so far there has not been any report of this part causing this symptom.

This part can possibly cause this error code and it has been confirmed to cause this symptom.

Technically, this part is not likely to cause this error code, but it has been confirmed to cause this symptom.

Slide 6

Quick Procedure To Check For Short or Low Resistance Condition of the Vsus,

Vda, and P15V Lines

Slide 7

Slide 8

Quick Procedure To Check For Short or Low Resistance Condition of the Vsus, Vda, and P15V Lines

1. Make sure the TV is disconnected.

2. Remove any residual charge from the Vsus and Vda lines by momentarily grounding them through a 500 ohms resistor (At least 5Watts).

3. Measure the resistance between chassis ground and the pins indicated on the table below. A dead short or a reading lower than 1K indicates a shorted or partially shorted line.

Note: Vsus is generated by the Power supply and is only used by the SS and SC boards

Vda is generated by the Power supply and is only used by the Panel (Panel Drive ICs)

P15V is generated by the Power supply and is used by the A, SS, and SC boards

Test points for the Vsus, Vda, and P15V can be easily found on the P board. To check for short circuit or low resistance on these lines, follow this procedure:

TC-P42G25

Preparation

Voltage Test Points

Connector/Wire Color

Pin Number Voltage

P11/White 1 Vsus

P11/Brown 4 P15V

P35/White 1 Vda

TC-P46G25TC-P50G20 TC-P50G25TC-P54G20 TC-P54G25

Note: For a quick procedure to determine the cause of the problem when a short or low resistance reading is found, see the next page. For a detailed procedure, see pages 11~16

Quick Procedure To Determine the Cause of the Problem if a short or Low

Resistance Reading is Found

Slide 9

Slide 10


If a short is found on the Vsus line, remove connectors P2/SC2 and P11/SS11 one at a time to determine if the SC board or the SS board is defective.

P15V is generated by the Power supply and is

used by the A, SS, and SC boards

Shorted Vsus

Shorted Vda

If a short is found on the Vda line, is likely that the panel or one of the C boards is defective. To determine which is defective, remove connector C10 between the C1 and C2 boards and the panel’s flex-cables connected to the C boards one at a time.

Shorted P15V

If a short is found on the P15V line, remove connectors P6, P11, P25, and SC20 one at a time to determine which board is defective. A shorted P15 is primarily caused by the following boards in the order presented; SC, P, A, and SS boards.Note: Even though is not common, the P board can also cause a shorted Vsus, Vda, or P15V.

Vsus, Vda, and P15V Distribution

Note: Vsus is generated by the Power supply and is only used by the SS and SC boards

Vda is generated by the Power supply and is only used by the Panel (Panel Drive ICs)

Note: For a detailed procedure, see pages 11~16

Note: For a detailed procedure, see pages 11~16

Detailed Troubleshooting Procedure for Shorted Vsus

Slide 11

Detailed Troubleshooting Procedure for Shorted Vsus

Start Here

Unplug connectors P2 and P11, on the P board. Measure the resistance between pin 1 of connector P2 and ground (Chassis)

Measure the resistance between pin1 of connector SC2 on the SC board

and ground (Chassis).

YesNo Is there a short

circuit?

Replace the P board


circuit?

Replace the SC board

Replace the SS board

Measure the resistance between pin1 of connector SS11 on the SS board

and ground (Chassis).


circuit?

Replace the SC and SS boards

Slide 12

See the picture on page 10 for connector’s location

Note: Perform firmware upgrade after replacing the SC or SS boards

Detailed Troubleshooting Procedure for Shorted P15

Slide 13

Detailed Troubleshooting Procedure for Shorted P15V

Start Here

Unplug connectors P6 and P11, on the P board. Measure the resistance between pin 1 of connector P6 and ground (Chassis)

Reconnect P11 and measure the resistance between pin 1 of

connector P6 and ground (Chassis)


circuit?

Replace the P board

Disconnect SC20 on the SC board and reconnect P6. Measure the resistance between pin 1 of connector P6 and ground (Chassis)


circuit?



circuit?

Replace the A board


Slide 14



Detailed Troubleshooting Procedure for Shorted Vda

Slide 15

Detailed Troubleshooting Procedure for Shorted Vda

Yes

Unplug the connector P35 on the P board and check the resistance between pin 1 of connector P35 on the P board and ground (Chassis).

No Replace the P board

Is there a short

circuit ?

Start Here

Reconnect the ribbon cable between the C2 and C3 boards and unplug the ribbon cable between the C1 and C2 boards. Measure the resistance between pin 1 of connector P35 on the P board and ground (Chassis)


circuit?

Yes NoIs there a short

circuit?

The problem could be the C2 board or the panel. Proceed to isolate the panel from the C2

board to determine which is bad.



TC-P50G20

TC-P50G25

TC-P42G25

TC-P46G25

TC-P54G20

TC-P54G25

Reconnect P35 and unplug the ribbon cable between the C2 and C3 boards. Measure the resistance between pin 1 of connector P35 on the P board and ground (Chassis)

Reconnect P35 and unplug the ribbon cable between the C1 and C2 boards. Measure the resistance between pin 1 of connector P35 on the P board and ground (Chassis)


circuit ?



Slide 16

Troubleshooting 1 Blink Failure

Slide 17

Troubleshooting 1 Blink Failure

If the TV shuts down and the power LED blinks 1 time, replace the A

Slide 68Slide 18

Troubleshooting 2 Blinks Failure

Slide 19

Troubleshooting 2 Blinks Failure (1 of 2)

Check connections between P6 on the P board and A6 on the A board.

Cautions: Disconnect the AC Power prior to making any disconnection or connection.


When taking voltage reading, place the voltmeter probe at the test point, component, or connector’s pin indicated before connecting the TV to the AC line. This will ensure voltage reading accuracy before the TV shuts down. (Since the TV is shutting down, expect the voltage to only come up a couple of seconds.)

Slide 20

P6/A6 connection

TC-P42G25 TC-P46G25TC-P50G20 TC-P50G25TC-P54G20 TC-P54G25


BlinkCode

List of boards likely to cause this symptom. (Based on reports and circuit operation).

Most Common 2nd 3rd 4th 5th 6th 7th

2 SC P SS A

This part can possibly cause this error code, but there has not been any reports of this part causing this symptom.


Note: Perform firmware upgrade after replacing the SC or SS boardsSlide 21


Yes

Follow the procedure on slide 8 to check the Vsus, Vda, and P15V for short circuit or low resistance reading.

NoIs there a short circuit of the

Vsus, Vda, or P15V?

Start Here

Unplug the TV and disconnect SC20 on the SC board. Plug in the TV and

turn the power on

Replace the A board


Follow the procedure on slides 9~16

6 Blinks 2 Blinks

YesNo

How many times is the power LED

blinking?

Replace the P board

YesNo Is there 15V

present?

Unplug the TV. Get ready to measure the voltage at pin 1 of connector P6 on the power supply. Plug in

the TV and turn it on.


Slide 22


The distribution of the P3.3V is done through ribbon cables. Measuring the P3.3V might be a little challenging and difficult. To easily measure the P3.3V, locate the test point TP9201or coil L9000 on the A board.

P3.3V Test Point TP9201 or L9000 on the A board




Slide 23

A


Slide 24

Yes

Unplug the TV and check the resistance between TP9201 on the A board and ground (Chassis).

(Go to the previous slide (Slide 45) to see a picture showing the location of TP9201.)

No Is there a short

circuit ?

Replace the A board

Unplug connectors A31 and A32, on the A board. Measure the resistance between TP9201 and ground (Chassis)

Disconnect the ribbon cable between C1 and C2 and reconnect A31. Measure the resistance

between TP9201 and ground (Chassis)


circuit?

Replace the A board


circuit?The problem could be the C1

board or the panel. Proceed to isolate the panel from the C1


The problem could be the C2 board or the panel. Proceed to isolate the panel from the C2 board

to determine which is bad.

BlinkCode



3 SC C1 C2 C3 Panel A




Disconnect the ribbon cable between C2 and C3 (C26)

and reconnect A32. Measure the resistance between

TP9201 and ground (Chassis) 50” & 54”

42” & 46”

Yes NoIs there a short

circuit?



Reconnect C26 and

disconnect A32


Start Here

YesIs there a short circuit of the Vsus,

Vda, or P15V?

YesNo Follow the procedure on slides 9~16


Slide 25

Slide 26

Troubleshooting a 4 Blinks Failure (1 of 2)




BlinkCode


Most Common

2nd 3rd 4th 5th 6th 7th

4 SC P A SS SD




Slide 27

Troubleshooting a 4 Blinks Failure (2 of 2)




Is there a short circuit of the

Vsus, Vda, or P15V?


YesNo

Start Here

Unplug the TV and disconnect SC20 on the SC board. Turn the power on

Replace the A board

Replace the SC board 6 Blinks 4 Blinks


blinking?

Unplug the TV and get ready to measure the voltage at pin 9 of

connector P7.Plug in the TV and turn it on.

YesNo Is there 3V

present?

Replace the P board


Slide 28

Slide 29





BlinkCode



5 SD A SC SS C2This part can possibly cause this error code, but so far there has not been any report of this part causing this symptom.



TroubleshootingUnplug the TV and do a resistance test between the P5V and ground to determine if the P5V is shorted or not.

P5V not shorted (Only the A and P board are suspected of causing the problem)If the P5V is not shorted, the possibilities of the SC, C2, and SS boards of being defective are eliminated.To determine between the P board and the A board, connect the TV, turn the power on, and check to see if the P5V is present.If P5V is present, the A board is likely to be defective. If P5V is missing, the P board is defective.

Shorted P5VIf a short is found, with the TV disconnected, start removing the connectors providing P5V one at a time until the source of the short is detected.

Slide 30


TC-P42G25

To easily measure the P5V, locate the coil L9801.

The location of L9801 is shown in the image below

TC-P42G25

A P5V (L9801) Location

Slide 31


Yes

Unplug the TV and check the resistance between L9801 on the A board and ground (Chassis). (Go to the previous page (Slide30) to see a picture showing the location of L9801.)

No Is there a short

circuit ?

Start Here

Unplug connectors A33 and A32, on the A board. Measure the resistance between L9801 of and ground (Chassis)

Reconnect A33 and measure the resistance between L9801 and

ground (Chassis)


circuit?

Replace the A board

Loosen the A board and disconnect SS33 on the SS board or C23 on the

C2 board. Reconnect A32. Measure the

resistance between L9801 and ground (Chassis)


circuit?



circuit?

Replace the C2 board


Follow the procedure on page 8 to check the Vsus, Vda, and P15V for short circuit or low resistance reading.


Replace the A board6 Blinks 5 Blinks


blinking?

Is there a short circuit of the Vsus, Vda, or

P15V?


YesNo

It’s rare but possible for the SD board to cause this

problem. Reconnect SC20 an

follow procedure on page41 To isolate the SD

board.




Slide 32

Slide 33


Energy Recovery/VscanThe energy recovery circuit and Vscan are monitored in the SC board. Failure of any these 2 circuits triggers the SOS6 line causing the unit to shut down and the power LED to blink 6 times.Under normal operation, the output voltage (MID) of the “Energy Recovery” circuit ranges between 68V and 138V. If the voltage drops below 67V or increases above 139V, the error detect circuit (IC16581) is triggered. This causes a high to be output to pin 21 of connector SC20.Pin 21of SC20 also goes high, if the Vscan generating circuit fails.

The voltage from SC20 is connected to pin 90 the SYSTEM MPU (IC1100) in the A board via the ANALOG-ASIC(IC5480).When pin 90 of the SYSTEM MPU (IC1100) goes high, the TV shuts down and the power LED blinks 6 times.

This condition is normally caused by the SC, A, or P board. (SC>A>P).6 blinks can also be caused by open connection between the C boards and open connection between any of the C board and the A board.




BlinkCode

List of boards likely to cause this symptom. (Based on actual reports and circuit operation).


6 SC SD A CThis part can possibly cause this error code, but so far there has not been any report of this part causing this symptom.



Slide 34


Yes

Unplug the TV and verify that all the cables on the SC board are properly seated. Also check the ribbon cables and connectors on the A and C boards. Disconnect connector SC20 on the SC board and connector C10 on the C1 board. Plug in the TV and turn it on

NoDid the

number of blinks change to 8 blinks?

Start Here

Replace the A board

Replace the SC board6 Blinks


Is there a short circuit of the Vsus, Vda, or

P15V?

Follow the procedure on

the pages 9~16

YesNo



8 Blinks


Slide 35

Slide 36


Cautions: Disconnect the AC Power prior to making any disconnection or connection.Wait at least 2 minutes before the removal of any connector.



Remove the front cabinet and expose the panel to a bright light for a thorough visual inspection. Check for cracks and blown pixels or any other abnormalities.

Check for burnt spots on the SM board.

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.

BlinkCode



7 SC SU SM SD Panel AThis part can possibly cause this error code, but there has not been any report of this part causing this symptom.


Slide 37


Yes

Unplug the TV and check all the connectors on the SC, SU, and SD (42” = SM board). Make sure they are properly seated. If the TV still shuts down with 7 blinks, unplug it and follow the procedure on page 8 to check the Vsus, Vda, and P15V for short circuit or low resistance reading.

No Is there a short circuit of the Vsus,

Vda, or P15V?

Start Here

Replace the A board

Unplug the TV and reconnect SC20. Isolate both the SU and SD boards together (Follow the procedure on page 38). Plug in the TV and turn it on. Note: Do not allow the TV to stay on for more than 30 seconds

Did the number of

blinks changed to 6

blinks?

Disconnect SC20. Plug in the TV and turn it on

Yes


No

Check the panel for abnormalities and burnt pixels.


the pages 9~16

Replace the SM board

Yes NoIs the TV still shutting down ?

Disconnect the TV and reconnectSC20. Plug-in the TV. Set your voltmeter to measure the voltage at pin 9 of connector P7 on the P board. Turn the TV on.

YesNo Is there 3V

briefly?

Replace the P board

6 Blinks

7 Blinks

42”

46”-50”-54”

Unplug the TV and isolate only the SU board. Follow the procedure on page 40

Yes NoIs the TV still shutting

down?

Replace the SU board

Unplug the TV and isolate only the SD board. Follow the procedure on page 41

YesNo Is the TV still shutting down?

Replace the SU and SD boards

Replace the SD board

The problem may be the SU, SD, or both.Even though is not required, the resistance test procedure on page42 can help in finding the problem. Skip this step if so desired and continue with the next step.


SU-SD boards (Together) Isolation Procedure

Slide 38

Slide 39

SU-SD boards (Together) Isolation Procedure

Procedure:1. Remove the 4 VFG screws from the SU and SD

boards. (See picture.)

2. Remove SC41, SC42, and SC46 from the SC board. Also remove the ribbon cable between the SU and SD boards (SU11/SD11).

3. Install the SC50 Jig or just jump pins 1 and 2 of connector SC50 on the SC board.

Preparation:Disconnect AC Power prior to making any disconnection or connection.Wait at least 2 minutes before the removal of any connector.

Note: 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.

Note: Remove the jig or the jumper after completing the isolation procedure.

Actual SC50 Jig

Slide 40

SU Board Isolation Procedure

1. Remove the 2 VFG screws from the SU board. Note: The 2 screws on the SD board should be installed.

2. Remove SC41/SU41 and the ribbon cable between the SU and SD boards (SU11/SD11). Note: SC46 and SC42 should be connected





Actual SC50 Jig

To isolate either the SU or the SD board individually, all the connectors, (Except the panel flex-cables) and the VF-GND screws on the board have to be removed. (See the picture below)

SU board Isolation Procedure

Slide 41

SD Board Isolation Procedure

1. Remove the 2 VFG screws from the SD board. Note: The 2 screws on the SU board should be installed.

2. Remove SC46/SD46 and SC42/SD42 and the ribbon cable between the SU and SD boards (SU11/SD11). Note: Make sure SC41/SU41is connected.





Actual SC50 Jig

To isolate either the SU or the SD board individually, all the connectors, (Except the panel flex-cables) and the VF-GND screws on the board have to be removed. (See the picture below)

SU board Isolation Procedure

Vfo, VSCN-F, & 5V_F Resistance Measurements (SU-SD boards)

Slide 42

Slide 43


SC41/SU41 Pin

Number

Test PointAround SU41

SC42/SD42 Pin

Number

Test PointAround SD42

Line Resistance Reading with

SC41 Removed

2 TPSU15 1 TPSD29 VFO 2.2M

4 TPSU16 2 TPSD28 VSCN-F (TPSC1) 221K

8 TPSU17 6 TPSD26 5V_F 5.7M

9 TPSU18 VF_GND Reference Ground

This test is done to determine if the SU, or SD are bad.While a short circuit found on any of these boards confirms a defective board, a normal resistance reading does not necessarily indicates that the boards are 100% functional.If no short circuit is found on any of these boards, perform the SU and SD isolation procedures shown on page 38.

Procedure:1. Remove the 4 VFG screws from the SU and SD boards. (See picture to the next page (page 44).)

2. Disconnect SC41, SC42, and SC46 from the SC board. Also remove the ribbon cable between the SU and SD boards (SU11/SD11). (See picture on the next page (Page 44).)

3. Using the VF-Ground (VF_GND) as reference, measure the Vfo, VSCN-F, and 5V-F resistance’s on the SU and SD boards individually. (Use the test points around SU41 and SD42 shown on the pictures on the next page (page44). The board is considered to be bad is a short circuit or a very low resistance reading is found on any of these lines.



Slide 44


SC

SC Board

SD Board

VF-GND

SU Board


Slide 45

Slide 46


PP

SS2SS2

AA

IC1100SYSTEM MPU

IC5480ANALOG-

ASIC

A6

A32

5V

3

PANEL _SOSSOS8

66

43063

68P5V

C2C2

SSSS

ENERGYRECOVERY

IC16251(8X) SOSDETECT

15V

SOS8

SS11

P6 3

Vsus1

4

P5V

PAN

EL M

AIN

O

N

P15VVda Vsus P11

C23C21

1

4

SS61

SS64

SS58

SS21

SS24

D16253

SS331 7

Vsus pulse

SOS8P5V

Vsus

P15V

D16255

D16280

1 1 76

Q16280

Slide 47


Yes

Check all the cables between the SS board and the panel. Make sure they are properly seated in the connectors. Unplug the TV and disconnect SS33 on the SS board. Plug in the TV and turn it on

NoCheck connections between the SS, C2, and A boards. If ok, replace the A board

Does the TV turn on and

stay on?

Start Here

YesNo Is continuity ok

in all the connectors?


Check connections between the SS board and the panel. Check also connections between the SS2

and the SS board and the panel. If ok, then replace the panel

Unplug the TV. Check for continuity between pins 1 and 2 of connectors SS61 and SS64 on the SS

board . On connector SS21, check continuity between 6 and 7. (Go to the previous slide to see picture of connectors location). Do not plug in the

TV.




BlinkCode



8 SS A Panel C2 Connections

This part can possibly cause this error code, but there has not been any report of this part causing this symptom.



See the picture on page 10 for connector’s

location


Slide 48

Slide 49


1. Failure of PD4 IC9300 (Discharge control)This condition can cause the TV to shutdown and the power LED to blink 9 time

9 blinks can be caused by failure of IC9300, IC5480, and IC1100. Since all these ICs are located on the A board, only the A board should be replaced.

PP

AA

IC1100SYSTEM MPU

IC5480ANALOG-

ASIC PANEL _SOS

90

431

PAN

EL

MA

IN O

N

IC9300PD4

IC603POWER MICOM

A7 7

P7 7

Start Here

Replace the A board

Troubleshooting 10 Blinks Failure At Plug in

Slide 50

Troubleshooting 10 Blinks Failure At Plug in

Is there 3.2V present for a couple of

seconds when the TV is pluggedinto the AC line?

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

NO

NO Yes

Yes

ReplaceThe P board

Do the AC relaysclick after the TV is plugged

into the AC line?

ReplaceThe A board


into the AC line?

NO Yes

Unplug the TV. Make sure P6 and P7 on the P board are properly seated. Plug in the TV but do not turn the power on

Unplug the TV. Using a voltmeter, place the positive

probe at pin 6 of connector P7 while the negative probe is grounded. Plug in the TV

Unplug the TV and disconnect connector A1 on the A board. Plug in the TV.

Do not turn the power on

YesIs

there 15V at pin 7 of connector P6/A6 when

the TV is plugged into the AC line?

No

Does theTV turn on?

ReplaceThe K board

Unplug the TV. Disconnect connectors A1 on the A

board and Plug in the TV and press the power switch

YesNoReplaceThe A board

ReplaceThe P board

Note: When taking voltage reading, place the voltmeter probe at the connector’s pin indicated before connecting the TV to the AC line. This will ensure voltage reading accuracy before the TV shuts down.

Start Here

Slide 51

Troubleshooting 10 Blinks Failure At Power on

Slide 52

Troubleshooting 10 Blinks Failure After Power On

Start Here


Is there a short circuit of the Vsus,

Vda, or P15V?


the pages 9~16

YesNo

BlinkCode



10 SC A SD SS SU P K





Replace the A board6 Blinks 10 Blinks


blinking?


It’s rare but possible for the SU or the SD board to cause this failure. Reconnect SC20 and follow the procedure on page 38 and isolate the SU and SD

boards. Plug in the TV and turn it onIs the power

LED still blinking?

Yes No

Proceed to isolate the SD and SU boards

individually as explained on pages 40-41 to determine

which of the 2 is bad

Slide 53Note: Perform firmware upgrade after

replacing the SC or SS boards


Slide 54

Slide 55


1. A Board.2. Pinched speaker wire.3. Speakers

These 3 conditions can cause the TV to shut down and the power LED to blink 12 times

The transistor Q2300 monitors the speaker amplifier IC (IC2301). Pin 3 is normally high. If IC2301or one of the speakers develops a short circuit, pin 3 goes low causing Q2300 to go into conduction and output a low to the base of Q2300. As a result, Q2300 comes on and outputs a high to pin 27 of the System CPU (IC1100) on the A board.

BlinkCode



12 A Speaker





56

Unplug the TV and disconnect connectors A11 and A12 from the A board. Plug in the TV and press the

power switch

Does the TV power

up andstay on?

NoYes

If the speakers wiresare not pinched,

Replacethe speaker

Replacethe A board

Start Here

Slide 56




Troubleshooting No Power/Dead Unit

Slide 57


AAPP KKSTB

Circuit

P7 A7

IC1100SYSTEM

MPU

3.3VREG

A1 K1

1 1

POWERSWITCH

REMOTEREC.

3 3

LED

STB5VSTB3.3V

VccP9TV_SUB_ON

55

PANEL_MAIN_ON7 7

KEY_INPUT 5 5PowerMICOM

IC5480

RELAY

3.2V6 6

IC603 3.2V

1. A Board.2. P Board.3. K Board

These 3 conditions can cause the TV to be dead with no power.

Condition List of boards likely to cause this symptom.


Dead P A K

Cautions: Disconnect the AC Power prior to making any disconnection or connection.When taking voltage reading, place the voltmeter probe at the test point, component, or connector’s pin indicated before connecting the TV to the AC line. This will ensure voltage reading accuracy before the TV shuts down. (Since the TV is shutting down, expect the voltage to only come up a couple of seconds.)

Slide 58



into the AC line?

Is the TV turning On

Is there 5V presentwhen the TV is plugged into

the AC line?

Replacethe A board

ReplaceThe K board (CheckWires between A1

and K1)Replace

The P board

Yes

Yes

Yes

Yes

NO

NO

NO

NO

Unplug the TV and place your volt-meter on pin 7 of connector P7. Plug in the TV

and press the power switch

Is there 3.2V present when

the power button is pressed?

Unplug the TV and disconnect A1 on the A board. Plug in the TV and turn the power on

Unplug the TV and place your volt-meter on pin 1 of

connector P7. Plug in the TVBut do not turn the power on

ReplaceThe P board.

(Check the AC Cord)

Unplug the TV and disconnect A1 on the A board. Plug in the TV but do not turn the power on

Plug in the TV.Do not turn the power on

Do the relays click now?YesNO

Replacethe A board

Start Here

Slide 59

TV’s Behavior After Connectors Removal

Slide 60

Slide 61

TV’s Behavior After Connectors Removal

MODEL N0. TC-P42S2 (Connectors Removal on the SC Board)

Connector Connector Connector on C1 Board

Result

SC2 SOS 7 Blinks

SC20 SOS 6 Blinks

SC2 SC20 SOS 6 Blinks

SC2 C10 SOS 8 Blinks

SC20 C10 SOS 8 Blinks

SC2 SC20 C10 SOS 8 Blinks

MODEL N0. TC-P42S2 (Connectors Removal on the SS + combination of connectors on the SS board and SC board)

Connector Connector Connector on SC Board

Connector on SC Board

Result

SS11 TV Stays On

SS33 TV Stays On

SS11 SS33 TV Stays On

SS11 SC2 SOS 7 Blinks


SS11 SS33 SC2 SOS 7 Blinks



SS33 SC2 SC20 SOS 6 Blinks

SS11 SS33 SC2 SC20 SOS 6 Blinks

Note: If P6 is removed, the TV shuts down with 10 blinks.

If P7 is removed, the TV is dead (No power)

TC-P42G25

MODEL N0. TC-P42S2 (Connectors Removal on the A Board)

Connector Connector Connector Result

A20 SOS 6 Blinks

A31 TV Stays On (L-side OK/R-side Black)

A32 SOS 6 Blinks

A20 A31 SOS 6 Blinks

A20 A32 TV Stays ON with Black Screen

A31 A32 SOS 6 Blinks

A20 A31 A32 TV Stays ON with Black Screen

End

Slide 62

Documents

2010 FHD Plasma TV G20 G25 Series Troubleshooting Handbook