Panasonic GPH5D, TH50PHW5, TH50PHD5 manual High Voltage Power Supply

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High Voltage Power Supply

Figure 31

The P3-Board contains the drive voltage oscillator circuit that develops the Vsus voltage needed to drive the Scan and Sustain boards. Operation begins with the 18Vdc supply being applied to pin 12 of connector P15. This voltage serves as start up voltage for IC601. Q604, connected to pin 7 and 9 of the IC, provides Oscillation control. The oscillator generates a trapezoid pulse that is input to a PWM circuit (not shown) to control the output voltage. The PWM output at pin 2 of IC601 is applied to pin 2 and 3 of IC600. This IC is a wave driver that provides two square wave outputs at opposite polarity. The two signals are then output to the P1 board as H OUT at pin 1 and L OUT at pin 6 of connector P15. Amplification of the two signals is performed the transistors Q407, Q408, Q409, Q410 before being applied to the transformer T400. The output of the transformer is provided to the SC-Board via pin 1 and 2 of the connector P2 and to the SS board via Pins 2 and 3 of the connector P1.

Voltage feedback is provided via pin 8 of connector P16. This voltage enters pin 5 of IC601 for voltage regulation. R625 is used to set the output at the desired level.

Note: The voltage level of the Vsus output is not mentioned because it is different for each plasma display panel. This voltage level can be found on the panel information label located on the heat sink of the panel.

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Contents Troubleshooting Guide Panasonic Services Company National TrainingPage Page Objective HD Plasma Display HD Panel Digital Cinema Reality Model Line UpPanasonic Company PI Company F/H SpecificationsScanning Method InterlaceHD High-Definition panel FeaturesNew front ProtectionModel Differences Single Scan SD Rear Cover Removal DisassemblyPage Printed Circuit Board Information Table HD PCB Board Layout DiagramTXNP110MHS PCB Board Layout DiagramSD PCB Layout Diagram HY/HZ Board Video Signal Path ExplanationHX Board D1 Board DVI Interface Page RGB/PC Input Mode Sync Composite/ Component Video Input mode SyncSync Process D1 Board IC3001 Video SwitchD1 Main ICs Operation IC9007 A/D ConverterD2 Board D2 Board details SC Board Explanation Page Page SS Board Explanation Page Page Standby Power Supply Power SuppliesPower Factor Control Main Power SupplyVoltage Regulation Low Voltage Power supplyHigh Voltage Power Supply Page Protection Circuits Page Self Check Display Indication Diagnostic ProceduresPower LED Flashing timing chart No Power Diagnostic Flow ChartsPower LED is red and blinking on/off Power LED blinks twice No Picture Flowchart Are the video signals Dark picture Flowchart Local screen failure Service HintsPage Page Page Page Page Panasonic After Image Prevention Screen Saver FeatureSide Bar Brightness adjustment Accessing the Option Menu Option SettingHidden Option Menu for GPH5D series Option menus Default setting ContentsPage 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 Check Zone PDP Defect Pixel SpecificationBoard Connectors Connector TablesBoard Connectors OUT Board Connectors HX- Board Connectors HY / HZ- Board Connectors Panel label Information Adjustment ProceduresAdjustment table ∙ Adjustments+B Set-up Adjustments Driver Set-upItem / Preparation Initialization Pulse Adjust B. Printed Circuit Board exchange procedure Adjustment Volume LocationsQuick adjustment after P.C.B. exchange Test Point locations CAT computer aided test Mode Serviceman modeHow to access the CAT mode I2C ModeMemory data change CD modeOSD SD ModeI2C Menu Structure Ntsc Panel White Balance Alignment ProceduresPedestal Setting PC/RGB Panel White Balance Page HD /525i /525P Panel White Balance Page 625i Panel White Balance Sub Brightness Setting
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GPH5D, TH50PHD5, TH50PHW5 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.