Panasonic Television User Manual

Panasonic Service and Technology Company

Technical Guide

Generation Plasma Display Television

National Training

Panasonic Service and Technology Company

Prepared by

Cesar Perdomo and Jean Magloire

Panasonic Service and Technology Company

National Training

Warning

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. 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.

Subject Page # Subject Page #

2007 Panasonic Plasma Line-up Models Comparison High Resolution (FULL-HD Panel) TH-42PX75U Board Layout & Description TH-42PX75U Board Layout (Pictorial) 2006/2007 Signal Process/Switching Circuit Overall Block Diagram Standby Circuit STB5V/STB3.3V Distribution Main CPU VCC Supply (A Board) TV_SUB_ON/TUNER_SUB_ON

TV_SUB_ON (F_STB_ON) TV_SUB_ON (Relay Drive Circuit) PFC Circuit

5 6 9 13 14 15 16 21 25 28 30

32 34 36

Troubleshooting (No Power/Dead Unit) Part 2 SOS Circuit Overview DRV_RST SOS Location of Q9302 Close-up View of Q9302 5 Blinks SOS (1) SOS (Drive-reset) D & C Boards Connection 12 Blinks SOS Signal Circuit Overview Video Process Block Diagram

D Board Block Diagram Panel Drive (TH-42PX75U) Audio Process Block Diagram

56 59 62 63 64 66 68 69 70 75 77

79 81 83

ACFB (Active Clamp Full Bridge Switching) Circuit MAIN/SUB Voltages F+15V, DTV9V, SUB5V SOS Detect Circuit Power On Operation P15V/P5V Circuit Vsus/Vda Circuit Troubleshooting (No Power/Dead Unit) Part 1

37 39 41 43 51 53 55

Self-Check Function How to Reset the Unit Self-Check Menu Check point Serviceman Mode Serviceman Mode Menu and Navigation Internal Test Patterns

88 89 90 91 92 93 95

Table of Contents (Continued)

Subject Page #

Driver Setup Adjustment 96 Initialization Pulse Adjustment 97 Quick adjustment after P.C.B. exchange 98

2007 Panasonic Plasma Line-up

Models Comparison

High Resolution (FULL-HD Panel)

The Full-HD plasma panel boasts a total of about 2,070,000 pixels (1920 x 1080). It renders true-to-life HD images with about twice the resolution of a standard HD panel.

HD PDP

(approx. 1,050,000 pixels)

(approx. 2,070,000 pixels)

●

Full-HD PDP

●

1080

768

●

1366

(Image resolution about twice as high)

●

● ●

1920

*When compared to the 50PX600

●

About Twice the Resolution of a Standard HD PDP!

Generation Plasma Television

Board Layout

TH-42PX75U Boards Layout & Description

Panasonic started using single scan addressing in the 42” HD models last year when the 9th generation of Plasma TV was introduced. The single scan addressing was only used on standard definition models previously. For this generation, Panasonic has added the 50” models to the list of TV using single scan addressing.

TH-42PX75U Board Layout (Pictorial)

2006/2007 Signal Process/Switching Circuit

The 2007 42” plasma models have less boards than the previous generation. The PA, DT, DG, H, and HC boards used on the 2006 42” models are now incorporated within the new A board of the 2007 models.

Overall Block Diagram

The operation of the plasma TV can be divided into 3 different sections:

1. Power Supply Circuit

The power supply circuit board (P board) provides voltages to the Signal switching/processing circuit and the Panel drive circuit.

2. Signal Switching/Processing Circuit Upon connecting the unit to the AC voltage source, the STB5V of the P board is provided to the A board

for system control operation. The F_STB15V is also provided to the signal switching/processing circuit of the A board. It remains present for approximately 25 seconds unless the power button is pressed. This circuit also receives 15V for audio operation and fan drive for models with fan.

3. Panel Drive Circuit. The Panel drive circuit receives the Vsus, Vda, 15V, and 5V sources from the P board when the unit is

in operation.

Generation Plasma Television

Power Supply

Standby Circuit

1. When the TV is connected to the AC line, the power supply outputs 5V.

2. This voltage is applied to the D board and the A board. The 5V applied to the D board in the

Panel Drive Section is not used during standby operation.

3. On the other hand, when the A board receives the 5V from the Power supply, it outputs the

“F_STB_ON” command.

4. This command is applied to the power supply board to generate the F_STB15V. The F_STB15V is applied to the A board to energize the Signal SW/Process Circuit.

Standby Circuit

When AC is applied to the TV, the Standby circuit outputs 5Vdc and 12Vdc. The 5V is applied to the Power MCU and the switching transistor Q537 of the power supply circuit. The 12V is provided to the SS board. A jumper at connector SS34 of the SS board routes the 12V back into the power supply board to turn on Q537. When Q537 is on, the STB5V is output to the D and A boards. On the D board, the STB5V is applied to a 3.3V regulator (IC9011). During standby operation, this regulator is kept off to disable the panel drive circuits. The STB5V is also applied to a 3.3V regulator (IC5604) on the A board to provide the supply voltage (STB3.3V) to the Main CPU (IC1100). The STB3.3V is also applied the Remote Control receiver and the power LED on the K board. Furthermore, the STB3.3V is provided to the SD card slot (Not shown in the diagram).

When the Main CPU IC1100 receives the 3.3V, it outputs the TV_SUB_ON/TUNER_SUB_ON command to the Power MCU (IC501) located on the Power Supply board. Subsequently, the power MCU outputs the following commands:

1. Relays ON/OFF _ To turn on the circuit that activates on the AC relays. The PFC (Power Factor

Control) circuit goes into operation to create the DC voltage needed to power the ACFB circuit.

2. VLOW ON/OFF _ to turn on the ACFB (Active Clamp Full Bridge) circuit to generate the 15V.

3. F_STB_ON/OFF_ to provide the command to turn on the DC-DC converter to output the F+15V.

The F+15V is applied to the 5V/9V regulator, IC3500, on the A board. The voltage outputs of IC3500 are used by various circuits on the A board. To avoid catastrophic failures, they are monitored by an SOS Detect circuit for over-voltage and over-current conditions. This SOS Detect circuit is controlled by the TUNER_SUB_ON command from the Main CPU (IC1100). The 9V from IC3500 is also applied to a 3.3V regulator (IC5600). The 5V and 9V from IC3500 and the 3.3V from IC5600 are connected to the CPU for voltage presence detection.

STB5V/STB3.3V Distribution

The STB5V is connected to the D and A boards. During standby, this voltage is not used by the D board. On the A board, the STB5V is applied to a 3.3V regulator (IC5604) to generate the STB3.3V to power the MAIN MICON Genx4 (IC1100). The STB3.3V is also connected to the remote receiver IC and the power LED on the K board.

STB5V (2)

P25

This circuit combined with the circuit in the following page is used to explain the reason why the CPU (IC9003) on the D board is not active during Standby. The transistor Q9014 is on to keep PANEL_STBY_ON low.

STB5V (3)

The STB5V source is connected to the voltage input (pin 4) of the RESET/STB3.3V regulator IC9011. The output of this IC is controlled by the ON/OFF pin (Pin 6). The DC level of this pin is determined by the “STB3.3V ON/OFF” circuit. During standby pin 6 of IC9011 is low keeping IC9011 off. When the power is turned on; pin 6 goes high, the IC turns on and outputs 3.3V on pin 3.

Main CPU VCC Supply (A Board)

On the A board, the STB5V is applied to pins 3 and 4 of the 3.3V regulator (IC5604). Pin 4 is the voltage input to the IC and pin 3 is the ON/OFF command. The STB5V at pin 3 allows pin 5 to output 3.3V. The 3.3V from IC5604 is then applied to pins 31, 50, 74, 78, 81, 85, and 100 of the CPU (IC1100). This turns on the main CPU (IC1100) and a high command (TV_SUB_ON/TUNER_SUB_ON) is output on pin 1. This command splits in 2 (TUNER_SUB_ON and TV_SUB_ON). The TUNER_SUB_ON command together with the STB5V is applied to the “SOS detect circuit” to monitor the sub voltages generated in the A board. The TV_SUB_ON command is applied to the power supply board (P board) to create the F+15V.

TV_SUB_ON/TUNER_SUB_ON

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