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Panasonic PT50DL54 - 50" DLP TV, Техническое руководство

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Panasonic PT50DL54 - 50

DLP 

™

 Concept 

The most recent of the projection TV systems is Digital Light Processing 

™

 Technology 

or DLP 

™

.  DLP 

™

 Technology, after being conceived in 1987, was brought into the 

practical market by Texas Instruments technologies recently.   
 
The DLP 

™

 system consists of 4 main sections (refer to figure 4): 

1. Lamp 
2. Color wheel 
3.  Digital Micro-Mirror Device (DMD) 
4. Projection Lens 

 

Figure 5 - Nine 
Mirrors Magnified 

Figure 4 - DLP 

™

 System

Lamp 

See figure 4. The system starts with a white, high brightness lamp.  This mercury vapor 
lamp has two electrodes and no filaments. Since there are no filaments, more voltage is 
required to start the lamp, unlike a fluorescent bulb. However, the mercury lamp has a 
longer life. As in a fluorescent bulb, once the arc is started across the electrodes 
(between the filaments in a fluorescent bulb), the operating current is limited and 
regulated to maintain consistent brightness.   
 
 

Color Wheel 

The light generated by the lamp passes through the spinning color wheel panes.  See 
figure 4.  The color wheel is driven by a 3-phase motor (not shown) that starts when the 
TV is turned on.    
As the wheel rotates, it produces synchronization pulses that are delivered to the DMD 
video circuit.   The sync pulses “cue” the video, which has already been regrouped into 
RGB bursts by the DMD circuitry (not shown).   

  

5 

 

Содержание PT50DL54 - 50" DLP TV

Страница 1: ...TSD0501DLPB06 Technical Guide High Definition DLP Projection Television GN1D Chassis PT 50DL54 PT 60DL54 Technology Start Up Protection Troubleshooting Adjustments Panasonic Services Company National Training Center ...

Страница 2: ...s of BBE Sound Inc Copyright 2005 by Panasonic Services Company All rights reserved Unauthorized copying and distribution is a violation of law Warning This service information is designed for experienced repair technicians only and is not designed for use by the general public It does not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to servic...

Страница 3: ...UIT 13 POWER ON CIRCUIT 13 TROUBLESHOOTING SCENARIOS 14 VOLTAGE DISTRIBUTION 14 COLOR WHEEL OPERATION 17 CONCEPT 17 COLOR WHEEL REPLACEMENT 17 COLOR WHEEL CIRCUIT BLOCK DIAGRAM 18 COLOR WHEEL MOTOR DRIVE INPUTS 18 Drive Waveforms 19 COLOR WHEEL ASSEMBLY OUTPUTS 19 Output Waveforms 21 COLOR WHEEL ADJUSTMENT 21 BALLAST CIRCUIT 23 LAMP ON SEQUENCE CHART 23 BALLAST BOARD LAYOUT 23 BALLAST BOARD REQUIR...

Страница 4: ... 5X 40 SHUTDOWN POWER LED BLINKS 6X 7X OR 8X 41 SHUTDOWN POWER LED BLINKS 9X 41 SHUTDOWN POWER LED BLINKS CONTINOUSLY 42 SHUTDOWN TEMPERATURE LED BLINKS CONTINOUSLY 42 VIDEO SIGNAL FLOW 43 VIDEO OUTPUT FROM LVDS INTERFACE IC 44 LOSS OF LVDS SIGNAL 45 APPENDIX 47 I SERVICE MODE FUNCTIONS ACCESS 47 SERVICE MODE FUNCTIONS 47 ENTRY TO BASIC SERVICE MODE 47 ENTRY TO EXTENDED SERVICE MODE 48 EXIT FROM T...

Страница 5: ...re analysis Video Enhancement 4 Edge correction circuit wideband video output Audio Enhancement 1 BBE Sound Processing Audio Enhancement 2 Surround Sound Audio Enhancement 3 Sound compression to avoid sharp audio bursts Audio Output level Fixed variable selected with speaker off Speakers Four 8 ohm speakers Power Rating 30 Watts 10 THD 11 A V Inputs 2 TV 3 composite 3 component HDMI DVI with digit...

Страница 6: ...w as an example Movie Frame Electronic pictures 1 3 2 2 3 3 4 2 5 3 Video Picture 3 2 1 13 Pictures from 5 movie frames The duplication process is repeated until the 24 frames become 60 frames for TV Telecine process for movie film to video conversion Duplicates each odd frame by 3 12x3 36 pictures Duplicates each even frame by 2 12x2 24 pictures 60 pictures from 24 movie frames TV feature 3 2 pul...

Страница 7: ... interface that connects two AV units and transfers digital non compressed high definition video and audio data Unlike DVI HDMI allows simultaneous transfer of multiple channels of audio making it ideal as a high definition digital interface for relaying HD broadcasts in a single multi wire HDMI cable Figure 3 shows the difference between the DVI video plug and the smaller HDMI A V plug DVI socket...

Страница 8: ...4 ...

Страница 9: ...s Since there are no filaments more voltage is required to start the lamp unlike a fluorescent bulb However the mercury lamp has a longer life As in a fluorescent bulb once the arc is started across the electrodes between the filaments in a fluorescent bulb the operating current is limited and regulated to maintain consistent brightness Color Wheel The light generated by the lamp passes through th...

Страница 10: ...directions the system is digital on or off Brightness Brightness levels between full on and full off are created by turning the mirror on a number of times in a given period The more times it is on the brighter that pixel seems to appear The human eye averages the brightness levels Color Blends Figure 6 shows how different colors are created in this system The 3 mirrors shown represent one DMD mic...

Страница 11: ...Board PS Board 6 Rear input H Board 7 Digital HDMI input DG Board 8 Audio Output Z Board 9 Side input board G Board Table 1 9 Board Complement Board Interconnections Board to Board interconnections Audio Board Z connector destinations Tuner Board TU connector destinations Part number TNP2AA193S Part number TNP2AA192S Z1 H4 rear input TU1 DG11 digital board Z2 P6 PS Bd TU2 H2 rear input Z3 Speakers...

Страница 12: ...rconnect board DG11 TU1 tuner board P9 L4 light box DG12 Front panel Power buttons DG15 L5 light box Side input board connector destinations Front keyboard connector destinations Part number TNP2AA184S Part number TNP2AA186S G1 H1 K1 DG12 G2 DG8 See tips for easier access and removal of these boards Rear input board connector destinations Color Wheel assembly inside light engine Part number TNP2AA...

Страница 13: ...opy EEPROM data before replacement see appendix 5 CW Assembly Color Wheel TXFEN01RP4S Sync adjustments see Service Mode 6 P Bd power supply TNP2AA181S none 7 PS Bd PS regulators TNP2AA187S none 8 Z Bd audio TNP2AA193S none 9 TU Bd tuner TNP2AA192S none 10 H Bd rear input board TNP2AA180S Check top H5 and H6 seating 11 G Bd side input board TNP2AA184S none 12 K Bd front button board TNP2AA186S none...

Страница 14: ...10 ...

Страница 15: ...ough the chassis lamp door switch and thermal breaker before getting to the AC relay Power on relay clicks Surge relay clicks Two relays total 4 Two fans come on Micro uses CW assembly temp sensor to control fan a Lamp fan large b Power supply fan 5 Color wheel CW starts L Board drives the motor in the CW assembly Audible whirling sound from CW left of the ballast 6 DLP light engine L board receiv...

Страница 16: ...s 5 3 of 4 internal light box LEDs darken 6 Lamp goes off 10 seconds after pressing the power off button but both fans stay on 7 After the lamp turns off the Microprocessor counts 20 more seconds and then opens the power relay so that only the standby 7Vdc remains active fans and lights go off 12 ...

Страница 17: ...tandby 5V is applied to Microprocessor IC1103 Figure 8 Standby Power on Block Diagram Power on Circuit Refer to figure 8 Once standby voltage is available at microprocessor IC1103 it responds to a power on command either from the remote via IR receiver or from the front panel power button both not shown At power on the DG board microprocessor s AC_SW output produces a high 5V measured at DG2 pin 5...

Страница 18: ... Check for constant 5Vdc at P4 pin 1 after the power button is pressed while the green power LED blinks If this P4 pin 1 voltage is missing work backwards to its source at DG pin 5 However if this P4 pin 1 voltage is present the problem is on the P board Q842 RL802 low standby voltage etc c Power LED blinks continuously relays click If there is a blinking green power indicator but the relay s do c...

Страница 19: ...ution Power Supply Load Resistance Readings to Ground Load Location Resistance Destination 20V line P6 pin 1 800 ohms increasing to infinity Audio amp Z Bd 20V line P6 pin 4 0 754 k ohms Audio amp Z Bd 5V reg line P7 pin 5 infinity DG Bd via PS Bd 8V line P7 pin 7 infinity 5V regulator PS Bd 3 3V reg line P9 pin 1 0 331 k ohms LCD Engine L Bd 9V reg line P9 pin 3 0 330 k ohms DG Bd 5V reg line PS2...

Страница 20: ...16 ...

Страница 21: ...eo driven DMD device The video is synchronized to the spinning color wheel The color wheel begins spinning at power on If the color wheel stops the TV shuts down and the Power LED blinks nine times red pauses and repeats Color Wheel Replacement Replacement Three screws hold in the color wheel assembly from the top of the light box assembly Refer to figure 11 Unplug the input connector L3 and outpu...

Страница 22: ...wered by IC6011 on the L board All three phase motor drive inputs can be monitored at connector L3 See table 7 If one of the three drive signals is missing the motor makes a ticking sound instead of a normal whirling sound as it spins Color Wheel 3 phase Motor Drive Voltages L3 Pin DC Voltage Vp p Frequency Description 1 9 5Vdc 2Vp p 5Vspikes Common 2 9 5Vdc 5Vp p 8V spikes 738 Hz Phase 1 3 9 5Vdc...

Страница 23: ...into DLP connector L3 Waveform Description Voltage Frequency Location Channel 1 Phase 1 5Vp p 8V spikes 738 Hz L3 pin 4 Channel 2 Phase 2 5Vp p 8V spikes 738 Hz L3 pin 2 Channel 3 Neutral common 2Vp p 5V spikes 2 127 kHz L3 pin 1 Time base 0 5ms div Phase 1 Phase 2 Neutral common Figure 13 Color Wheel Motor Drive Waveforms Color Wheel Assembly Outputs The color wheel assembly contains two circuits...

Страница 24: ...cted the TV shuts down see protection circuit part of this book Therefore the color wheel output is an important early part of the TV start up sequence Temperature Output Refer to figure 14 The temperature sensing IC6904 within the color wheel assembly is the second output from the color wheel assembly This signal is routed to the microprocessor DG Board via serial data clock at L2 pin 4 and pin 5...

Страница 25: ...2 pin 3 Channel 2 I2 C serial data 3 Vp p 16 3 Hz L2 pin 4 Channel 3 I2 C serial clock 3 Vp p 16 3 Hz L2 pin 5 Time base 10ms div data clock Rotation pulses Figure 15 Color Wheel Output Waveforms Color Wheel Adjustment If the color wheel assembly is replaced because of picture noise picture solarization see Video Signal Flow or TV shutdown the TV must be adjusted The bursts of RGB video must be sy...

Страница 26: ...e the CW I adjustment pattern shown in figure 17 Blk separator blue green red Figure 17 Color Wheel Adjustment screen 5 Press the left right arrow buttons to change the data while watching the pattern in the areas between the black separator bars see OK picture The data is correct when this area in between the black separator bars is a solid color Further adjustment is required if there are additi...

Страница 27: ...brightness in 1 minute 5 The ballast control circuit grounds B2 pin 3 to inform the microprocessor that the lamp is drawing current lamp turned on 0Vdc Ballast Bd B2 pin 3 Use cold chassis ground Lamp Off 6 Press the power off button 7 The Microprocessor ballast turn on command goes low A V is muted 0Vdc Ballast Bd B2 pin 1 Use cold chassis ground 8 Ballast stops the 20kVac supply to the lamp Lamp...

Страница 28: ...he 335V is filtered by L001 and C001 before passing through R106 to the DC to DC converter stage consisting of IC001 T001 and D003 The converter stage is a regulated 15Vdc for the ballast control circuit MC001 2 operation No PWM or drive signals are output from this control circuit until it receives a ballast on command Ballast ON This command comes from the microprocessor DG board as a High B2 pi...

Страница 29: ...e is fed to the control circuit MC001 MC002 is for MOSFETs drive only Once MC001 determines the lamp is within the normal current range lamp is operational the ballast control circuit informs the microprocessor by using PC002 to ground out the voltage from the microprocessor input B2 pin 3 When this pin is grounded the microprocessor knows that the lamp is lit and changes the ballast on signal int...

Страница 30: ...ken glass or a broken electrode a sound is heard when the lamp is shaken Replace the lamp if something is loose in the lamp assembly 2 Ballast Test Refer to figures 19 and 20 You can test the Ballast by either a watching the Z001 Figure 19 TV rear view bottom Z 001 See figure 20 spark gap device glow proving that the ballast can develop HV or b by bypassing the microprocessor and manually turning ...

Страница 31: ...the microprocessor turns on the ballast and in turn the ballast turns on the lamp within 5 seconds from pressing the power on button However by manually connecting 2 points on the ballast board the ballast circuitry turns on and develops 20kV to ignite the lamp without a command from the microprocessor Figure 21 Ballast Board Layout 27 ...

Страница 32: ...ites the lamp or the spark gap if there is a lamp defect proving that the ballast is good If neither the lamp or spark gap light check for missing 388Vdc at B1 pin 1 brown wire from the power supply use hot ground at CN005 before suspecting the ballast Caution There is over 20KV at the bottom of the ballast board 3 Microprocessor test There are 2 ways to check the microprocessor output to the ball...

Страница 33: ...G board outputs a high to turn on the ballast B2 pin 1 it also outputs a high L5 pin 9 to turn on the lamp enable LED on the L board Therefore if the second 2 LED is lit the ballast on signal is assumed to have been generated by the microprocessor L Board LED Indicators There are internal LED indicator lights on the L board left of the ballast assembly During power on warm up they show the micropr...

Страница 34: ...30 ...

Страница 35: ...ce Before replacing the lamp verify the ballast circuitry operation Remove the lamp and then replace the lamp door without a lamp inside Remove the rear panel 18 screws Refer to figure 24 for the location of spark gap Z001 While watching spark gap Z001 through the perforated ballast shield turn on the TV After 38 seconds the spark gap should emit light caused by a HV arc which should last for abou...

Страница 36: ...ive panel and the lamp door To avoid burns the lamp should be allowed to cool off before removal The lamp p n is TY LA2004 Figure 26 TV Front without decorative panel Lamp door Captive Screw Perforated ballast shield Figure 25 Spark gap location on the Ballast board removed 32 ...

Страница 37: ...Service Mode 1 TV 2 Hold in the VOLUME DOWN button on the front panel and simultaneously hold down the RECALL button on the remote control A red CHK appears on the screen s top left corner See figure 27 If a color screen appears press RECALL repeatedly until CHK reappears Turn on the CHK 00005 00000000 00 00348 001F 000F Lamp time in 16 min hex increments Figure 27 Lamp hours as displayed near the...

Страница 38: ...34 ...

Страница 39: ...ocation Normal Votlage 1 X Short on the 30V line P5 pin 2 0Vdc 2 X Excessive voltage at the 12V 9V or 3 3V line P5 pin 3 0Vdc 3 X Fan rotation not detected P5 pin 4 0Vdc 4 X 3 3Vdc from the power supply not detected DG5 pin 7 3 3Vdc 5 X Lamp fails to light after TV powers on DG1 pin 3 DG15 pin 9 0Vdc lamp lit 3Vdc ballast on 6 X microprocessor IC4001 DG Bd communicatins 7 X microprocessor IC4201 D...

Страница 40: ...e DG board pins re 30 and listed in table 13 This will prove that there is a valid shutdown n of to the se signal and shutdown is not caused by a problem within the DG board A descriptio each shutdown circuit follows this block diagram so that you can work backwards shutdown cau Figure 30 Shutdown Block 36 ...

Страница 41: ...ount of current passes through R845 and 0 6Vdc is dropped cross it Q845 turns on causing its collector to rise When the voltage at DG2 pin 2 aches 1 2Vdc Microprocessor IC1103 shuts down the TV and blinks the power LED 1X pauses and then repeats As shown in figure 31 the load on the 30V line includes the 12V 9V and 3 3V regulators IC843 5 and their loads Disconnect the loads while monitoring the c...

Страница 42: ...respectively If one of these regulators becomes leaky input output the high output voltage will break over the corrresponding zener When the zener conducts the increase in voltage from 0V to t er he trip voltage of 1 2Vdc at DG2 pin 3 causes the icroprocessor to shutdown the TV wer on Figure 32 Power LED blinks 2X m Locate the defective regulator by measuring each of these output voltages at po Th...

Страница 43: ...magnetic field created when the fan rotates The circuit grounds pin 3 of the respective fan plug to keep the microprocessor from shutting down the TV Unpluging the fan plug normally shuts the TV off When a fan is unplugged pin 3 rises to 4V because of a local PS board pull up resistor e g R967 R968 or R971 This High is applied to Microprocessor IC1103 pin 94 to shutdown the TV All the fans are pow...

Страница 44: ...shows t board must Figure 34 Power LED blinks 5X the 4 LED indicators on the L board If the lamp enable 2nd LED is lit the microprocessor is providing a ballast on signal which can be verified B1 pin 1 3V a power on If this 3Vdc is present the spark gap Z001 on the ballast momentarly arc at power on If it arcs the lamp is bad If it does not arc the ballast assembly is bad See the ballast lamp sect...

Страница 45: ... If the power LED blinks 6X 7X or 8X and repeats the problem is caused by a communications failure on the digital DG board itself or by absence of power applied to the DG board Refer to figure 36 for details of the shutdown but refer to the power on section of this guide for a simplified power distibution path figure 9 to chec the DG board If all the voltages are present then the DG board is suspe...

Страница 46: ...continously the TV is either too hot or the temperture sensor IC6904 is defective The eight pin DIP package IC6904 is connected to the microprocessor on the IIC bus If the bus between this IC and the n does microprocessor is broken the TV will not shut down Therefore if a shutdow occur because of IC6904 check for air blockage about the color wheel housing unstable supply voltage 3 3V before replac...

Страница 47: ... 2 If the input signal is component video the main signal is diverted to IC4201 that contains a higher resolution 10 bit A D converter before entering IC4401 3 If the input is component video and the split PwP picture feature is selected the signal path is the same as the composite video path via IC4609 Troubleshooting tips Use the PwP feature to identify a problem in the DG board If the left main...

Страница 48: ...sumes less total power The power consumption of a constant current source is independent of frequency unlike TTL Low signal jitter and little generated noise with constant current output Long distance signal transmissions with little amplitude frequency lo Mbps capacity for a 1 meter distance or 90 Mbps for a 10 meter run Short duration signal losses are acceptable because the scra process permits...

Страница 49: ...he DMD s L board see figure 41 Refer to figure 42 Since the RGB signal is scrambled between the LVDS transmitter and receiver a loss of one of the LVDS RGB lines produces noise in the picture that evident in solid colors such as sky blue However loss of the sync signal along the same LVDS digital video cable or a defective Figure 43 Loss of LVDS sync signal Figure 42 Loss of a LVDS video signal No...

Страница 50: ...46 ...

Страница 51: ...to select DDP Press RECALL to select pattern 6 Solid screen color wheel adjustment Extended service mode Navigate with arrow buttons to CW I Press ACTION to select CW I Input red and use arrow buttons for a solid color 7 Video Sub picture adjustments White Balance tint color Extended service mode Navigate with arrow buttons to color tint bright etc Press ACTION to select Press action button twice ...

Страница 52: ...0000 001F 001E Figu e t t re 45 Servic mode screen after lamp ime reset Lamp ime reset to zero Entry to Extend rvice de This extended serv While in the basic s mode is for a ice mode pre justments s the power on off the remote control The TV will not turn o Use the arrow butt f but it will r the extended service mod as shown in figure 46 Press the remote s A the original Exten TION butt Service Mo...

Страница 53: ... To convert the hexadecimal TV on time found in the service mode to decimal time follow these three steps 1 Convert each hexadecimal number to a decimal number F 3 Hex 3 Decimal Add the results total to get the decimal equivalent hex number E g 0 0 4 10 15 3 3 x 1 000 003 15 x 16 000 240 10 x 256 002 560 4 x 4096 016 384 0 x 65 536 000 000 e g 0 0 4 A 0 0 4 10 15 2 Multiply each decimal number Y b...

Страница 54: ... loc con tor upper left corner t the lamp will start If you use cold chassis ground instead of B2 pin 2 use the TV board shields because the ballast or the DLP engine shielding icing Plug in the TV and turn on the power The TV w l remain but lam w o S Proce r to e 4 1 Unplu th s em th rforated ballast shie and ate nec B2 2 Unplug B2 and connect B2 pin 3 blue wire to ground pin 2 of the plug Do no ...

Страница 55: ...oid diminished light output always place the screen s label part numbers on to of each other Refer to figure 48 LSGP0374 TKG2AH50741 Fresnel LSGP0373 LSGP0365 Lenticular PT60DL54 PT50DL54 Figure 48 Screen mounted into the Bezel 51 ...

Страница 56: ...2 Lift its tab to clear the boss underneath 3 Slide the panel off to the right exposing the side board underneath 4 Remove the two screws that hold the input board in place 5 Slide the input board out from the front hole Although the side input board can be removed from the back it is not possible to re insert it that way without damage T Light gray panel Lift tab after removing screw Figure 49 Fr...

Страница 57: ...he old DG board Procedure lug the TXFJIG02SER copy jig into the digital b nter the extended service mode and highligh elect it by pressing on the Action button rom the new menu choose ALL to copy all the data ADJ to c ustment data or FIX to copy the fixed data 5 the jig by highlighting IN EX and select it by pressing ction Transfer the selected data from A 6 53 TXFJIG02SER EPROM jig Data transfer ...

Страница 58: ...ount screws Figure 51 L board mounting screws 2 Refer to figures 51 and 52 1 Do not tighten the 3 recessed screws that mount the new L board 2 Loosen the 2 left side black screws 3 Turn on the TV and move the L board to coarse center the picture using a mirror to see the screen and then tighten the black screws No black borders must e picture tighten the 3 recessed screws and mount the shield appe...

Страница 59: ... mode as shown below in figure 53 2 If the horizontal and vertical cross hairs are not parallel with the bezel frame figure 53 perform the mechanical position adjustment steps 3 5 after you have rechecked the chassis mounting position Otherwise skip the positioning steps 3 5 and proceed to the mechanical focus adjustment steps 6 8 Mechanical position adjustment 3 Refer to figure 53 Remove the acce...

Страница 60: ...p or down to obtain the sharpest video Tighten the focus knob 8 Replace the access port 2 screws and the decorative front panel push on Both of these are not shown Electrical H V Position adjustment Electrical positioning is performed using the remote in the exte the cross hair signal is still on the screen Entry to Service Mo in the VOLUME DOWN button on the front panel and e figure 44 in this se...

Страница 61: ...ut pressing it a second time nded Service Menu 12 Use the arrow buttons again to change the data As the data changes the cross hatch will move horizontally or vertically selections position the center cross hatch lines so they lt to see taken to Figure 55 Extended Service Mode for H V positioning returns to the original Exte 13 With the HPOS or VPOS line up with the notches on the bezel Notice tha...

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