Panasonic TH-42PX75U, TH-50PX75U, TH-42PX77U, TH-50PX77U 10th generation Plasma TVs troubleshooting Part-2

 

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.

Troubleshooting for Picture Trouble.  How to determine the defective board.

Diagnosis for Picture Problem (All Over the Screen). Abnormal Color, Vertical Line, Sync Error, Noise Picture-All Models

Diagnosis for Picture Problem (All Over the Screen). 

Enter the “Internal Test Pattern Generator”

or

Is the screen “White”, after disconnecting the connector “A5”?

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 Inch).

Picture Trouble in 50 Inch Models.  No Picture, Picture noise, Half Vertical line, etc.

Picture Trouble all Over the Screen.  Picture noise, Full Vertical line, etc.

Symptoms and Remedies.

Picture Problem (All over the screen).  Noise Picture, Vertical Line.

Abnormal colour and sync error.

Picture Problem (Right half or Left half). 

Self-check Procedure.  CHASSIS: GPH10D:  All models.

 [This procedure does not reset the TV]

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.

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.

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.]

TH-42PX75U/ TH-42PX77U Driver Setup Adjustment.

1. Input a white signal to plasma video input.

2. Set the picture controls as follows.

Picture menu: Vivid

Normal: Set

Aspect: Full.

Caution

1. First perform Vsus adjustment.

2. Confirm the voltage level of VSCN. This should be done after the adjustment of Vad which should be - 105V

When Vad = -105V, Vscn voltage is 40V ±4V.

Initialization Pulse Adjustment.

1. Input a 100% White signal to the unit.

2. Set the picture controls as follows:

Picture menu : Vivid

Normal : Set

Aspect : Full

3. Connect an Oscilloscope to test point TPSC1. Using VR6602, adjust (T2) for 195+/-10µ Sec.

TH-50PX75U - TH-50PX77U Driver Setup Adjustment.

TH-42PX75U and TH-50PX75U BOARD LAYOUT AND PART NUMBERS

TH-42PX77U and TH-50PX77U BOARD LAYOUT AND PART NUMBERS