Panasonic Plasma TV Troubleshooting procedure TH65, TH58, TH50, TH42

 PDP 2007 Models:

TH-65/58/50PZ750U, TH-58/50/42PZ700U, TH-50/42PZ77U, TH-50/42PX77U, TH-50/42PX75U

Diagnosis by Test Pattern

In case of PDP, the picture problem at all over the screen (Picture Noise, Full Vertical Line) is mainly caused by D or DG (A) board defective. This Test Pattern is able to diagnose D or DG (A) board. Because, D board had Test Pattern. So, we can judge by using Test Pattern which is defective. Regarding diagnosis for these board,  confirm as follows.

All Models  Picture Noise, Full Vertical Line

Enter the Test Pattern

1. While pressing "VOLUME-" button of the TV set, press "RECALL" button of the remote control three times within 2 seconds.

2. Push button "1" of Remote Controller several times, and select "OPTION" setting.

3. Press "OK" button of Remote controller for three seconds or more to place the unit in the test pattern.

In case of No picture problem (Sound OK), the defective board is mainly DG (A) or D board. But in this case, Test Pattern isn’t useful for diagnosis. Because, this symptom can not display OSD and not enter to the Service Mode. This method is possible to judge the defective board in this symptom.

All Models  No picture (Sound OK)

Diagnosis for Vertical Line

Abnormal Picture All over the screen

Possibility  DG, D Board

1. Disconnect D5 connector

2. Enter to the Test pattern

How to enter the Test Pattern

1. While pressing "VOLUME-" button of the TV set, press "RECALL" button of the remote control three times within 2 seconds.

2. Push button "1" of Remote Controller several times, and select "OPTION" setting.

3. Press "OK" button of Remote controller for three seconds or more to place the unit in the test pattern.  If you can measure the  waveforms by oscilloscope, you can identify which DG board is good or not.

Electronic Abnormal Discharge  Picture All over the screen

SC, SU, SD Board

Disconnect SU or SD Board

Abnormal Picture, Vertical Line (Corner Area, Some part of the screen)

D, C Board, Plasma Panel

LGP32-12P EAY62769501 OPVP-0137 LCD TV Power board schematic, pin voltages and functions

 Used ICs: IC101: L6599AD; IC202: AZ431LANTR-E1; IC251: AS431AN; IC601: SCY99102BDR2G

AC 100V to AC 240V

Inrush Current: 80A zero-peak max at cold start and any specified line, load, temperature conditions.

Power Output Characteristics

On Condition: In a moment of Power-ON Signal activated, the current of 3.5V output should be limited within 40mA(Max) at LCD TV condition for stability. [Do not turn “Power-ON” Signal on at the load condition of 3.5V output, more than 40mA.]

Total regulation for each output circuit includes the results of input voltage variation, load variation, warm-up drift and temperature change.

The following instruments shall be used for measuring ripple noise.

1. Probe having impedance ratio of 1:1.

2. Oscilloscope having frequency characteristic of 100MHz or more.

Ripple and noise are measured at the end of output cable which are added a 0.1uF ceramic capacitor and 47uF electrolytic capacitor. (Connected parallel)

Burn-in

More than 2 hours at 45℃(±5℃), Normal input voltage.

AC on/off must be test 1 time after burn-in.

80% Load of specification.

This Power Supply has  protections.

* Short circuit protection between different output terminals is not considered.

* Trip point for over voltage indicates the operating point when the output voltage slowly increases.

* The conditions of Over Current measurement Multi output(3.5V,12V,24V) is nominal load state except an over current measurement.

Connectors and voltages

Schematic [Circuit diagram]

LG EAY62629102 Power adapter - AC 100 to 240V 65W Adapter schematic and PWB layout

 

Used ICs U1: OB2201CPA; U2: TL431   EAY62629102 LG Power Adapter Circuit Diagram and printed circuit board top and bottom view.

Schematic

Printed circuit board views