Panasonic TH50PHW5, TH-50PHD5, TH-42PHD5, TH-42PHW5 manual Protection Circuits

Page 36

Protection Circuits

Figure 32

Protection circuits are incorporated in the unit to prevent the failure of a single circuit or component from creating catastrophic damage.

The P7 and P8 boards are daughter boards on the P1 main power supply board. The P7 board monitors the Vbk (195V), Vda (75V) and +17V supply voltages. The voltages are fed through individual voltage dividers and the result is compared to a 3.3V reference voltage by a comparator IC750. If any of the voltages drop low, the comparator outputs a low triggering Q751. Q751 triggers Q750 on, applying a high to pin 95 of the main CPU IC9351.

The circuitry on the P8 board monitors the plus and minus 13.5V lines used by the audio circuit, the +5V line and another +13.5V line. If any of these supplies were to drop, the comparator will output a low signal turning on Q776. Q776 conducts applying a high to pin 95 of the main CPU IC9351.

The four ventilation fans are monitored to be sure they are operating properly. If one of the fans opens or increases resistance, the resulting current change is applied to pin 98 of the main CPU.

The Scan and Sustain voltages on the SC and SS boards are monitored in a similar manner. The +15V Line on the SS board is fed to a voltage divider and

36

Page 35 Page 37
Image 36
Page 35 Page 37
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 panelNew front ProtectionModel Differences 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 AV/RGB/PC Input Mode Sync Component Video Input mode SyncSync Process 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 InformationAdjustment table Adjustments+B Set-up Driver Set-up Item / PreparationInitialization Pulse Adjust B. Printed Circuit Board exchange procedure Adjustment Volume LocationsQuick adjustment after P.C.B. exchange 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
Related manuals
Manual 40 pages 56.02 Kb Manual 92 pages 7.89 Kb Manual 40 pages 5.26 Kb

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.
Top Page Image Contents