Panasonic TH50PHW5, TH-50PHD5, TH-42PHD5, TH-42PHW5 manual Main Power Supply, Power Factor Control

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Main Power Supply

Figure 30

Power Factor Control

The power factor control circuit operates like a boost regulator. The incoming AC voltage, after being switched on, enters the rectifier D402 where it is converted to DC. The Power Factor Control (PFC) circuit converts the DC level to 400Vdc.

The negative side of the bridge rectifier D402 connects to ground via a resistor. As current flows through the resistor, the resulting voltage drop enters pin 5 of connector P19/P19A of the power factor control circuit board. The power factor control circuit board is a switching control oscillator circuit which boosts the input voltage at pin 2 of the transformer T401 to 400Vdc. As the pulses are output at pin 4 of connector P19/P19A, the transistors Q400~Q405 are switched On/Off controlling the charge and discharge time of the inductor L401. The output voltage is monitored via pin 11 of the connector P19/P19A. The resistor R548 adjusts the output voltage to 400Vdc. The 400Vdc output to pin 2 of the transformer T401 subsequently enters the drain of transistor Q416.

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Contents Panasonic Services Company National Training Troubleshooting GuidePage Page Error! Bookmark not defined Objective Model Line Up HD Plasma Display HD Panel Digital Cinema RealitySpecifications Panasonic Company PI Company F/HFeatures HD High-Definition panelModel Differences New frontProtection Single Scan SD Disassembly Rear Cover RemovalSC2 SC4 HD PCB Board Layout Diagram Printed Circuit Board Information TablePCB Board Layout Diagram TXNP110MHSSD PCB Layout Diagram Video Signal Path Explanation HY/HZ BoardHX Board D1 Board DVI Interface Page Sync Process AV/RGB/PC Input Mode SyncComponent Video Input mode Sync IC3001 Video Switch D1 BoardD1 Main ICs Operation IC9007 A/D ConverterD2 Board D2 Board details SC Board Explanation Page Page SS Board Explanation Page Page Power Supplies Standby Power SupplyMain Power Supply Power Factor ControlLow Voltage Power supply Voltage RegulationHigh Voltage Power Supply Page Protection Circuits Page Diagnostic Procedures Self Check Display IndicationPower LED Flashing timing chart Diagnostic Flow Charts No PowerPower LED is red and blinking on/off Power LED blinks twice No Picture Flowchart Are the video signals Correct at the D1 Board input? Dark picture Flowchart Service Hints Local screen failurePage Page Page Page Page Panasonic Screen Saver Feature After Image PreventionSide Bar Brightness adjustment Option Setting Accessing the Option MenuOption menus Default setting Contents Hidden Option Menu for GPH5D seriesPage Sample Waveforms CN H2, Pin A8 CN H2, Pin A19 5ms /div 1ms/ div Page HX board Page SC Board Input Signals SC Board Waveforms CLK SS-Board Input Signals SS Board Waveforms PDP Defect Pixel Specification Check ZoneConnector Tables Board ConnectorsBoard Connectors OUT Board Connectors HX- Board Connectors HY / HZ- Board Connectors Adjustment Procedures Panel label Information+B Set-up Adjustment tableAdjustments Driver Set-up Item / PreparationInitialization Pulse Adjust Quick adjustment after P.C.B. exchange B. Printed Circuit Board exchange procedureAdjustment Volume Locations Test Point locations Serviceman mode CAT computer aided test ModeHow to access the CAT mode I2C ModeCD mode Memory data changeSD Mode OSDI2C Menu Structure Alignment Procedures Pedestal SettingNtsc 480i White Balance Adjustment 480p White Balance Adjustment 720p White Balance Adjustment 1080i White Balance Adjustment Sub Brightness Setting Service Contact Information Non -authorized limited time
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TH-50PHD5, TH-42PHD5, TH50PHW5, TH-42PHW5 specifications

Panasonic has long been a prominent name in the plasma television market, and models like the TH-50PHW5, TH-42PHD5, TH-50PHD5, and TH-42PHW5 embody the brand's commitment to innovative features and high-quality performance. These models showcase advanced plasma technology that was at the forefront during their release, catering to both casual viewers and home theater enthusiasts.

The TH-50PHW5 is known for its impressive 50-inch display that delivers vibrant colors and deep blacks, providing an immersive viewing experience. One of its standout features is the 1024x768 resolution which, combined with the ability to handle multiple video formats, ensures that content is displayed with clarity and precision. This model supports a wide color gamut, which results in lifelike images that enhance film and sports viewing.

The TH-42PHD5 and TH-50PHD5, both featuring a 42-inch and 50-inch screen respectively, focus on professional-grade quality with a strong emphasis on high contrast ratios. These models utilize Panasonic’s Pure Driving Technology, allowing for smooth motion handling and a reduction in motion blur. This is particularly beneficial for fast-paced content such as action films or live sports, where clarity is crucial.

One of the notable technologies across these models is the Real Black Drive System, which enhances the levels of black in images, leading to improved contrast and detail in darker scenes. This is complemented by a 16:9 aspect ratio, allowing for an expanded viewing field that suits modern widescreen formats.

The TH-42PHW5 is particularly praised for its versatility, with various input options including HDMI and component video connections, making it suitable for a range of devices from gaming consoles to Blu-ray players.

These models also boast a robust design, making them suitable for both home and commercial installations. The ability to mount them on walls or utilize them in digital signage applications demonstrates their practicality.

Overall, Panasonic’s TH-50PHW5, TH-42PHD5, TH-50PHD5, and TH-42PHW5 televisions offer a blend of advanced plasma technology, versatility, and exceptional picture quality that was ahead of their time, solidifying their place in the plasma TV legacy.
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