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E-BOX SYSTEM CONTROL

The System Control Microprocessor 7200 controls the E-Box via the Remote Control and Front
Keyboard.  The System Software is located in the ROM 7202.  The RAM 7206  stores changes to
the parameters of the set while in operation.  This memory is cleared when the set is switched Off.
The Non Volatile Memory NVM 7212 stores Option Codes, Sound, and Picture adjustments.  The
I/O expanders, 7204 and 7213, are D/A converters to output SOUND_ENABLE, STBY, etc.  The
System Control is located on the SSB (Small Signal Board).

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FIGURE 44 - E-BOX MICROPROCESSOR

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Summary of Contents for E-BOX

Page 1: ...0 KNOXVILLE TN 37914 1810 PHONE 865 521 4397 FAX 865 521 4818 EMAIL TECHNICAL TRAINING PHILIPS COM P H I L I P S TECH VIDEOTAPE S M A N U A L S TRAINING PSSG PHILIPS SERVICE SOLUTIONS GROUP FTV1 9 DISPLAY PANEL AND E BOX TRAINING MANUAL PLASMA DISPLAY E BOX ...

Page 2: ...16 PLASMA PANEL BOARD LEVEL TROUBLESHOOTING 19 PLASMA PANEL BOARD LOCATION 29 PLASMA PANEL CUSTOMER SERVICE MODE 30 PLASMA PANEL DISASSEMBLY 31 E BOX INTRODUCTION 35 E BOX REAR VIEW 36 E BOX BOARD LOCATION 37 E BOX VIDEO SIGNAL FLOW 39 E BOX WIRING INTERCONNECT 36 E BOX SERVICE ALIGNMENT MODE 47 E BOX CUSTOMER SERVICE MODE 48 E BOX SYSTEM CONTROL 49 ...

Page 3: ...less the unit is placed in the Service Mode When the E Box is connected to the Display the AV inputs on the Display are disabled The Display cannot be placed in the Service Mode while the E Box is connected The Display has a VGA in a VGA out which is a loop though from the VGA in two composite inputs and one Y Cr Cb component inputs The AV inputs which are the two composite inputs and the Componen...

Page 4: ... The Display is then covered by a glass plate A voltage is applied to the Red Green and Blue Address Electrodes corresponding to the desired brightness and color of the displayed pixel A Voltage is then applied to the Display Electrode for the line that the pixel is to be dis played NOTES Page 2 ...

Page 5: ...e Line Conditioner panel When the set is turned On the Standby line from the Microprocessor goes Low The Error Detect circuit on the VS VA Supply panel switches the Standby line to the Line Conditioner panel High The Control circuit on the Line Conditioner panel switches the Relays On applying power to the Boost Regulator circuit This circuit outputs 380 volts dc to the VS and VA supplies on the V...

Page 6: ...FIGURE 1 POWER SUPPLY BLOCK Page 4 ...

Page 7: ...FIGURE 2 STANDBY POWER SUPPLY 5500 Page 5 ...

Page 8: ...s High via the 5VSTBYSW line If one of the Shutdown circuits is activated 7371 is turned On which turns 7370 On turning the set Off The 5VSTBYSW and Supply On lines are fed to the Line Conditioner panel Figure 4 There is a two stage turn On to supply power to the Line Conditioner circuit When the Supply On line goes High 7681 turns On switching relay 5680 On Capacitor 2683 provides a short delay f...

Page 9: ...FIGURE 3 POWER ON CIRCUIT FIGURE 4 LINE CONDITIONER POWER ON Page 7 ...

Page 10: ...Page 8 FIGURE 5 VS SUPPLY BLOCK FIGURE 6 VS SUPPLY OUTPUT ...

Page 11: ...oduce the 17 volt supply Voltage from Pin 11 is rectified by 6202 to produce the minus 19 volt supply Diode 6201 rectifies voltage from Pin 11 to produce the plus 19 volt supply These voltages are used to power the Audio Amplifier When checking voltages in the Audio circuit use the Audio Ground If either of the plus or minus 19 volt supplies are lost the Audio Protection circuits will shut the set...

Page 12: ...ariable Resistor 3126 is used to set the VA supply to the correct voltage Additional control for the supply from the Plasma Display is fed to Shunt Regulator 7111 via the Vra voltage Regulator 7111 drives 7110 If the Vra voltage is missing the set will go into shutdown The 17 volt supply powers the Feedback circuit Regulator 7110 drives the opto isolator 7102 which provides a correction voltage to...

Page 13: ...he output of the Regulator also feeds the 8 6 volt regulator 7203 If the 5 1 volt source reaches 7 4 volts Zener diode 6205 will conduct switching SCR 7202 On This will cause fuse 1103 to open The failure of these supplies will cause the set to shut down FIGURE 9 5 1 AND 8 6 VOLT SUPPLY BLOCK Page 11 ...

Page 14: ... Plasma Display the Vrr line will go Low Transistor 7701 will turn Off This will cause transistors 7702 and 7703 to turn On The VSTART line will go Low which will shut the VA Supply down This will cause the set to shut down and generate an error code Transistor 7704 will also turn Off shutting Off the VA supply to the Plasma Display FIGURE 10 SEQUENCER PANEL Page 12 ...

Page 15: ... 7114 which will cause the Aa line go Low In addition Transistor 7341 will turn On switching the Protection Status line High If the VA supply reaches 67 75 volts the set will go into shutdown The VS supply is sampled by resistors 3033 3058 and 3034 If the VS supply reaches 198 volts the input to Shut Regulator 7012 will go to 2 5 volts turning 7012 On This will turn On 7017 and SCR 7013 The Aa lin...

Page 16: ...ode will be generated by the Microprocessor When the Fans are operating Transistors 7316 7317 7318 7319 and 7320 are turned On This keeps the FAN PROT line Low If any of the Fans fail the Transistor monitoring that fan will turn Off When the collector reaches 9 4 volts the FAN PROT line will go to 0 6 volts activating the Shutdown circuits FIGURE 12 FAN PROTECTION CIRCUIT Page 14 ...

Page 17: ...FIGURE 13 SHUTDOWN CIRCUITS Page 15 ...

Page 18: ...the VS supply to go High shutting the supply Off PLASMA PANEL VIDEO SIGNAL FLOW When the Display panel is used without the E Box Composite and Component inputs to the panel are via the INPUT panel Figure 14 If the input is a NTSC Component input signal the Y Cr Cb signals are buffered by 7020 7014 and 7025 These signals are fed to the YUV to RGB matrix This signal is then fed to 7013 Signal Proces...

Page 19: ...FIGURE 14 INPUT PANEL Page 17 ...

Page 20: ...Page 18 NOTES ...

Page 21: ...FIGURE 15 AVC PANEL VIDEO PROCESSING Page 19 ...

Page 22: ...FIGURE 16 PDP LIMESCO VIDEO Page 20 ...

Page 23: ... the value for FF The input on Pin 4 determines what voltage level will be the value for 00 This level is determines by the OUTPUT_DITHER signal The H_BLACKLOOP sig nals can switch off the OUTPUT_DITHER signal to fix the value on Pin 4 The 8 bit output from the RGB circuits are fed to the Scan Converter 7327 develops the On Screen Display which is also fed to the Scan Converter The Scan Converter ...

Page 24: ...Digital delays 7910 and 7920 are used when a European Pal Plus signal is used to ensure the correct lip sync Audio from the YC panel is input on Pins 3 and 5 Audio to the internal amplifier is output on Pins 18 and 15 Outputs on Pins 7 and 26 are fed to a mute circuit and then to the Audio output connectors on the display Volume Bass Treble Balance and Mono Stereo switching are performed in 7940 f...

Page 25: ... PASS FILTERS The Left and Right internal audio signals are then fed to High and Low pass filters located on the AVC panel Figure 18 The Left and Right audio signals are then fed to the Audio Amplifier panel via AVC89 Page 23 ...

Page 26: ...inus 19 volts from the VS supply These supplies are labeled VSND and VSND There are four audio channels Left High Left Low Right High and Right Low Muting of the Audio amplifiers is accomplished by applying a Low on connector A20 Pin 3 The total output for the Audio Amplifier is 13 watts RMS Page 24 ...

Page 27: ... supply should fail or become overloaded the base of 7560 will become positive causing 7560 to conduct This will turn 7562 On which will switch the DCPROT line High causing the set to shut down If the positive supply should fail the emitter of 7561 will become more negative than the base causing the transistor to conduct This will also cause 7562 to turn On causing the set to shut down BOARD LEVEL...

Page 28: ...FIGURE 21 AUDIO AMPLIFIER WIRING INTERCONNECT Page 26 FROM VS VA PANEL FROM AVC PANEL ...

Page 29: ...tandby light on the unit check the 5 volt standby voltage on PR08 Pin 6 When the On Off button is pressed the 5VSTBY voltage on PR08 Pin 5 should appear When the set is turned On the SUPPLY_ON line should go to approximately 5 volts The 380 volts dc on PR09 Pin 1 is referenced to Hot Ground on Pin 3 Page 27 TO FROM VS VA PANEL AC INPUT ...

Page 30: ...ode to a Standby mode Once the set is in the Standby Mode it can be operated with the Remote Control The 5VSTBY is switched to the operating circuits of the set via the 5VSTBY SW line The LED panel is connected to the Switch Panel The LED panel has the indicator LED s and the Remote receiver Page 28 TO AVC PANEL ...

Page 31: ...n Pin 10 of FD04 This line should go Low when the set is turned On If it does not go Low the problem is on the AVC or Microprocessor panel If this line goes Low the 180 and 65 volt supplies should come On The Audio supplies on FD20 should also come On If they do not appear the VS VA panel should be replaced Page 29 ...

Page 32: ...nel It also switches the VA to the Display Off if there is a problem on the Vrr line When the set is turned On the Vrr line should go to approximately 3 volts If a problems is suspected with the PDP SP171 and SP173 can be disconnected If the PDP is the problems the operating voltages to the Sequencer panel should appear Page 30 ...

Page 33: ...FIGURE 26 AV CONTROL PANEL Page 31 ...

Page 34: ...VC36 The Microprocessor is connected to the AV Control panel on 7401 Output to the PDP Limesco panel is on connector AVC02 PDP LIMESCO PANEL Figure 27 Input to the PDP Limesco panel from the AV Control panel is on connector AVC02 Output Data Lines and Sync to the PDP is on PD03 If operating voltages to the PDP are present along with Data signals and Sync a no picture condition problem would most l...

Page 35: ...FIGURE 23 PDP LIMESCO WIRING INTERCONNECT Page 33 ...

Page 36: ...FIGURE 28 PLASMA DISPLAY WIRING INTERCONNECT Page 34 ...

Page 37: ...FIGURE 29 PLASMA DISPLAY BOARD LOCATION Page 35 ...

Page 38: ...LIGNMENT MODE SAM The SAM allows Error Codes to be read Clearing of the Error buffer and Alignments to be made To enter the SAM press the following buttons on the E Box remote 062596 followed by the Index button The Mode can also be entered by shorting the SAM Pins on the Microprocessor panel Note The Display SAM mode cannot be entered while the E Box is connected SERVICE DEFAULT MODE SDM The SDM ...

Page 39: ...he Front Cover is hinged on top Lift the bottom up first then lift up Unplug the LED display and set the front cover aside Note If only the Front cover needs changing the unit does not have to be remove from the wall Using a 10 Torx remove the 16 clamps securing the Glass Plate to the Plasma Display Set the Glass Plate aside DISASSEMBLY Page 37 ...

Page 40: ...e down on a foam cushion Using a 10 Torx remove the 9 screws securing the Rear Cover Using a 10 Torx remove the 12 screws securing the Speaker Box to the chassis Remove the Speaker Box and set it aside Using a 20 Torx remove the four screws securing the wall mount to the chassis and Plasma Display Using a 10 Torx Page 38 ...

Page 41: ...nel Remove the screws from the VS VA supply and the PDP Limesco panels Two of the screws securing the Plasma Panel to the chassis are under these panels Unplug PD3 from the PDP Limesco panel Remove the strain relief from the main chassis Page 39 ...

Page 42: ...remaining screws securing the chassis to the Plasma Panel See the following picture for the hidden screws Lift the chassis off the Plasma Panel To reassemble follow the reverse order VS VA POWER SUPPLY PANEL PDP LIMESCO PANEL Page 40 ...

Page 43: ...gure 26 On AV3 it also has a European Scart input AV5 is the HD input This is a Y Pr Pb 1080i Component input AV6 is a DVD NTSC Y Cr Cb Component input It also has a VGA monitor input connector For the E Box to communicate correctly with the Display the correct cable must be used This cable has extra connections for Remote input from the Display UART IN and UART OUT for communication with the Disp...

Page 44: ...FIGURE 30 E BOX REAR VIEW Page 42 ...

Page 45: ...FIGURE 31 E BOX BOARD LOCATION Page 43 ...

Page 46: ...ch which is enabled by the OUTPUT ENABLE line The Sync processing circuit can accept either Sync on Y Composite Sync or separate Horizontal and Vertical Sync The Sync Processor outputs TTL Sync to the Small Signal board Sync from the Small Signal board is looped through the HD interface board and fed to the AVB panel If the HD input is selected in the menu the OUTPUT ENABLE line switches the Sync ...

Page 47: ...FIGURE 33 SSP PANEL SIGNAL FLOW Page 45 ...

Page 48: ...tio selected by the user YUV at two time Horizontal is then fed to the Signal Processor IC 7500 If the User selects the HD signal from the HD Interface panel this signal is fed to 7500 7500 selects between the output of the Feature board or the HD Interface panel The Matrix circuit in 7500 converts the YUV signal to the RGB outputs R VC G VC and B VC 7500 also changes the Brightness and Contrast o...

Page 49: ...FIGURE 34 AVB PANEL VIDEO SIGNAL FLOW Page 47 ...

Page 50: ...FIGURE 35 SSP WIRING INTERCONNECT Page 48 ...

Page 51: ...FIGURE 36 GLOBAL I O AND AV BUFFER Page 49 ...

Page 52: ...FIGURE 37 HD YUV SUPPLY SW LED Page 50 ...

Page 53: ...FIGURE 38 CLOSED CAPTION AND TEXT PANEL Page 51 ...

Page 54: ...Page 52 FIGURE 39 FRONT I O PANEL ...

Page 55: ...Page 53 FIGURE 40 E BOX WIRING INTERCONNECT ...

Page 56: ...cted the Remote must be pointed at the Display to enter SAM After the SAM has been entered the Remote Receiver on the E Box becomes active The first line of the SAM gives the date and identification number for the software that is loaded in the set The Error Buffer displays up to 10 errors in two lines The most recent error is stored in the most left position When the Error list is empty no errors...

Page 57: ...ction of the technician To enter the CSM press the Menu button on the E Box and at the same time press the Mute button on the Remote Use the P and P buttons on the Remote to change from page one to page two To exit the CSM press any key other than P or P on the Remote Control FIGURE 42 CUSTOMER MODE PAGE 1 FIGURE 43 CUSTOMER MODE PAGE 2 ...

Page 58: ...6 stores changes to the parameters of the set while in operation This memory is cleared when the set is switched Off The Non Volatile Memory NVM 7212 stores Option Codes Sound and Picture adjustments The I O expanders 7204 and 7213 are D A converters to output SOUND_ENABLE STBY etc The System Control is located on the SSB Small Signal Board Page 56 FIGURE 44 E BOX MICROPROCESSOR ...

Page 59: ...MMARTIN REV 08 09 2001 ...

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