Manuals / Panasonic / TV and Video / Flat Panel Television

Panasonic Generation Plasma Display Television manual PFC Circuit

Models: Generation Plasma Display Television

1 98

Download 98 pages 29.59 Kb

Page 36

PFC Circuit

PFC Circuit

Pin 16 of IC501 also goes low when pin 23 is “high”. When pin 16 goes “low”, the diode within the photo-coupler IC401 emits light to turn on the photo-transistor.

Pin 4 of IC401 goes “low”. This “low” is applied to the gate of Q401 turning it on to apply 12V to pin 8 of PFC circuit.

36

Image 36

Panasonic Generation Plasma Display Television manual PFC Circuit

Contents

Panasonic Service and Technology Company Technical Guide10th Generation Plasma Display Television National TrainingPanasonic Service and Technology Company Panasonic Service and Technology CompanyPrepared by Cesar Perdomo and Jean Magloire National TrainingTable of Contents SubjectPage # SubjectTable of Contents Continued Driver Setup Adjustment Initialization Pulse AdjustmentQuick adjustment after P.C.B. exchange 2007 Panasonic Plasma Line-up Models Comparison Models Comparison Models Comparison High Resolution FULL-HD Panel About Twice the Resolution of a Standard HD PDPHD PDP approx. 1,050,000 pixels Image resolution about twice as high *When compared to the 50PX600Page Board Layout 10th Generation Plasma TelevisionPage TH-42PX75U Boards Layout & Description TH-42PX75U Board Layout Pictorial 2006/2007 Signal Process/Switching Circuit Overall Block Diagram Overall Block Diagram Page Power Supply 10th Generation Plasma TelevisionPage Standby Circuit 1. When the TV is connected to the AC line, the power supply outputs Standby CircuitStandby 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 Standby CircuitSTB5V/STB3.3V Distribution STB5V 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 STB5VMain CPU VCC Supply A Board This command splits in 2 TUNERSUBON and TVSUBON Main CPU VCC Supply A BoardTVSUBON/TUNERSUBON TVSUBON/TUNERSUBON TVSUBON FSTBON P BoardThe F-STB-ON voltage 3.2V from pin 6 of connector P7 is applied to pin 23 of the Power CPU IC501 on the P board. IC501 sends out commands to first turn on the primary circuit of the power supply, and then the circuit that allows the FSTB15V to develop TVSUBON FSTBONTVSUBON Relay Drive Circuit TVSUBON Relay Drive Circuit 300ms later, pin 12 goes “low” allowing for only the main relay RL402 to remain on. RL401 is triggered whenever RL402 or RL403 are triggeredPFC Circuit ACFB Active Clamp Full Bridge Switching Circuit ACFB Active Clamp Full Bridge Switching Circuit 5. The FSTB15V is applied to pins 7, 8, and 9 of connector P6MAIN/SUB Voltages The F+15V from the power supply is applied to pins 6, 7, and 8 of connector A6 on the A board. The 15V is applied to the voltage input pin pin 9 of the “SUB+5V/SUB+9V” dual regulator IC3500. The 15V is also used to keep pin 1 and pin 15 high MAIN/SUB VoltagesF+15V, DTV9V, SUB5V SOS Detect Circuit F+15V, DTV9V, SUB5V SOS Detect Circuit The F+15V, DTV9V, and SUB5V are monitored for over-voltage and over-current conditions by the SOS circuit on the A boardPower On Operation Power On Operation The power command from the power switch on the S board or the remote control receiver on the K board is provided to the CPU in the A board. The CPU on the A board outputs the “PANELSTBON” command and the “FSTBON” command. The “PANELSTBON” is provided to the D board to turn on the STB3.3V regulator. The output voltage is applied to the CPU in the D board. The “FSTBON” command is provided to the power supply to develop the FSTB+15VPower-On Power-On When the unit is turned on using the power button on the front of the TV, the momentary connection of the power switch to ground supplies a low to the base of Q5604 DG board to turn it on. Q5604 outputs a low to the key input line pin 18 of the CPU IC1100 on the A boardPower On Power On Power On The STBY5V from the power supply board is applied to pin 4 of the regulator, IC9011. During Standby operation, the regulator does not operate due pin 6 being lowPower On Summary P15V/P5V Circuit The P15V is generated when the power is turned on. The high 3.2V “Panel Main On” command from the D board is applied to pin 24 of the Power MCU IC501 on the Power Supply board. When IC501 receives this command on pin 24 3.2V, pin 10 goes high P15V/P5V CircuitVsus/Vda Circuit Vsus/Vda Circuit Troubleshooting No Power/Dead Unit Part Unplug the TVTroubleshooting No Power/Dead Unit Part connector A52If cable between connectors GS52 and ReconnectShutdown Circuits 10th Generation Plasma TelevisionPage SOS Circuit Overview SOS Circuit Overview Protection circuits are incorporated in the unit to prevent the failure of a single circuit or component from creating catastrophic damage6 Blinks SOS 6 blinks of the power LED may also be obtained from pin 3 of IC9003, the SOS Circuit Overview10 Blinks SOS IC5600 is a 3.3V regulator located on the A board. Its output is monitored by IC1100. If the 3.3V is not present at pin 67, the MPU shuts down the unit. The power LED blinks 10 times SOS Circuit OverviewDRVRST SOS DRVRST SOS Test Point TP9200 is the ideal location to check for DRV RSTLocation of Q9302 Close-up View of Q9302 5 Blinks SOS The 5V SOS may be caused by a defective shift register located on a ribbon cable that connects the C boards to the panel. A shorted shift register typically shorts out both the Vda and 5V inputs. To determine whether a shift register is shorted or not, disconnect the connector SS23 and measure the resistance between pin 12 of the connector C23 and ground. The normal resistance is approximately 110000 ohms. If the panel is shorted, the resistance to ground is very low 5 Blinks SOSSOS Drive-reset D and C Boards Connection 12 Blinks SOS 1. Sound processing and adjustments are performed by IC2106. The two channel PWM audio output of the IC is applied to the audio power amplifier IC2301. The PWM signals of the power amplifiers are output to the right and left channel speakers for sound reproduction 12 Blinks SOSSignal Processing 10th Generation Plasma TelevisionPage Signal Circuit Overview Signal Circuit Overview The K is the Remote Receiver and Power LED board. Commands that originate from the remote control or keypad of the GS board are received and processed by the system control circuit located on the A boardVideo Process Block Diagram Video Process Block Diagram The main function of the A board is to select and process one of the incoming video signals. Video inputs 1 and 2, Component Video Inputs 1 and 2 and the composite video output of the tuner are all are connected to IC3001 for selection. The video output signal of the switch can be in any of the three formats Video, Y/C, or Y, Pb, Pr. The selected output enters IC4510, the HDMI IF Receiver/Decoder IC, for A/D conversionD Board Block Diagram D Board Block Diagram ComponentFunction ComponentPanel Drive TH-42PX75U Back side viewDrive insidePanel Drive TH-42PX75U Discharge ControlData Drive Audio Process Block Diagram Audio Process Block Diagram IC3101 of the A board handles the audio selection of most inputs. Analog Audio signals from composite, component, and DVI inputs are connected to IC3101 for selection. The analog audio of the tuner is also provided to IC3101 for selection. The output of IC3101 enters IC2106 and undergoes analog to digital conversion. The serial data output is provided to the switch. The HDMI receiver section of IC4510 converts the incoming HDMI audio into serial data. The Audio interface circuit selects between the two HDMI audio and outputs the SD serial Data to the switch located inside IC2106Page Adjustments 10th Generation Plasma TelevisionPage Self-Check Function remote control for more than 3 seconds1. Checks the communication IIC bus lines 2. Provides a SOS History How to Reset the Unit Note All customer programmed parameters will be erasedSelf-Check Menu Check point Serviceman Mode TV or the Remote ControlServiceman Mode Menu and Navigation Key commandAdjustment Sub Menu Internal Test Patterns TV or the Remote ControlDriver Setup Adjustment Driver Set-up Item / PreparationInitialization Pulse Adjustment 1. Input a 100% White signal to the unitAspect Full Quick adjustment after P.C.B. exchange 2. Quick adjustment after P.C.B. or Panel exchange1. Caution