Table of Contents
Related Manuals for Panasonic PT-50DL54
Summary of Contents for Panasonic PT-50DL54
- Page 1 Order NO. PASC/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...
- Page 2 Produced by Panasonic Services Company National Training Department Panasonic is a registered trademark of Matsushita Electric Industrial Co., Ltd. High-Definition Multimedia Interface and HDMI are trademarks of HDMI Licensing, LLC Digital Light Processing™, DLP™ and DLP Cinema™ are trademarks of Texas Instruments Incorporated, of which DLP™...
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Page 3: Table Of Contents
Table Of Contents FEATURES........................1 – 3:2 P ................2 EATURE ULL DOWN ROCESS Background ......................2 TV feature - 3:2 pull down ..................2 – D = 720 ..........3 EATURE ISPLAY FORMAT P NATIVE RESOLUTION – HDMI ™...................... 3 EATURE .................... - Page 4 & B ..................26 ESTING THE ALLAST 1. Lamp Test: ......................26 2. Ballast Test: ....................... 26 3. Microprocessor test:..................28 LED I ................... 29 OARD NDICATORS DEFECTIVE LAMP SYMPTOMS, REPLACEMENT, & TIME RESET ......31 ..................31 ND OF YMPTOMS : ....................
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Page 5: Features
Features Panasonic TV Models: PT-50DL54/ PT-60DL54 Wide Screen Projection HDTV / Monitor with DLP™ Technology Figure 1 - Panasonic ™ DLP ™ TV with remote (not to scale) Feature Type Screen Aspect Ratio 16:9 (wide screen) Split Screen Picture 2 NTSC tuners... -
Page 6: Feature - 3:2 Pull Down Process
Feature – 3:2 Pull down Process There are two parts to the 3:2 Pull down feature. The first is the background, explaining the 3:2 process that originated in the movie-film world. The second is the 3:2 pull down process found as a TV feature. Background Movie producers still shoot with mechanical movie film at 24 frames per second. -
Page 7: Feature - Display Format = 720P Native Resolution
When the 3:2 pull down feature is enabled (from the user menu): 1. The TV examines the incoming video to determine if the signal is in the 3:2 pull down telecine format. 2. The microprocessor then reorganizes the images so that two identical pictures are recombined to produce a single clear high-resolution picture. -
Page 9: Dlp ™ Concept
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. -
Page 10: Color Wheel Dmd
Operation Refer to figures 4 & 5. The colored bursts of light shine on the mirrored surfaces of the DMD device. The DMD surface consists of over a million tiny mirrors. Each mirror measures less than 1/5 the width of a human hair and can either tilt +12 degrees toward the lens to produce a light on the screen or tilt –12 degrees in the other direction (off), directing the light into oblivion (dark area). -
Page 11: Board P/N, Layout And Interconnections
Board P/N, Layout and Interconnections Figure 7 - Board & Connector Layout Board List PT-50DL54 / PT-60DL54 Primary Board complement: 1. Light Box L Board 2. Ballast B Board 3. Color Wheel CW Board 4. Tuner TU Board 5. Power supply P Board &... -
Page 12: Part Numbers For Common Parts
Interconnect Board connector destinations Light Box (L) connector destinations (PS Bd.) Position & Focus adjustments needed Part number = TNP2AA187S Part number = TXN/L01RPAS (L Bd.) P7 (power supply) DG4 (digital board) DG5 (digital board) Color wheel Small PS fan Color wheel Large lamp fan P9 (power supply) - Page 13 1. Ballast EUBMM021A10 none 2. L Bd. (DMD – Elect) TXN/L01RPAS Mech adjustment (see appendix) 3. Optical Assembly (Mech) TXG200RPAS See service manual for removal. 4. DG Bd. (Digital Video, TXN/DG01RP4S Copy EEPROM data before Microprocessor, EEPROM). replacement (see appendix) 5.
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Page 15: Power-On Sequence
Power-on Sequence After the unit is plugged in, the microprocessor responds to a power-on command. First, the power supply turns on. Second, both fans rotate, then the color wheel rotates, the ballast and the lamp turn on, and finally the microprocessor un-mutes the audio and video, completing the power-on sequence. -
Page 16: Power Off Sequence
Power Off Sequence 1. Press power off. 2. A/V is muted. 3. Power LED blinks yellow. 4. Color wheel stops. 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 7. -
Page 17: Standby & Power-On Circuit
Standby & Power-on Circuit Standby Circuit Refer to figure 8. When the PT-xxDL54 TV is plugged into an AC outlet, Standby 7Vdc is output to the P (power supply) board at P5/pin 9. Within the P board, a small 60 Hz transformer (T802) and a bridge rectifier (D882) is used to produce the standby voltage. -
Page 18: Troubleshooting Scenarios
Within the P board, this High is applied to the relay driver Q842 through the current limiting resistor R886. Q842 energizes the main AC relay RL802 so its contacts apply voltage to two power supplies: 1. Ballast Power Supply – produces regulated 330Vdc 2. - Page 19 Figure 9 - Voltage Distribution Although resistance measurements vary greatly depending on the type of ohmmeter, table 6 shows resistance values that you can use for relative measurements. All resistance values were taken using the same range (ohmmeter ranges have different output voltages and current, so readjusting the meter ranges could not be done for relative measurements).
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Page 21: Color Wheel Operation
Color Wheel Operation Concept The color wheel is positioned between the lamp and the DMD device to give the picture color. Refer to Figure 10. Light from the lamp passes through the color wheel. The color wheel consists of Red, Green, Blue and Black panes mounted on a 3 phase motor shaft (not shown). -
Page 22: Color Wheel Circuit Block Diagram
Color Wheel Circuit Block Diagram Refer to Figure 12. The color wheel operation can be understood by dividing the color wheel operation into the inputs (at L3) and the signal output (at L2). Notice that the color wheel assembly also contains the TV’s temperature sensor (IC6904) that governs the voltage applied to two fans (not shown). -
Page 23: Drive Waveforms
Each rotation of the wheel produces a corresponding output pulse from the optical interrupter IC in the Color Wheel assembly. This 180 Hz output signal is returned to the L board at L2/pin 3. Drive Waveforms The following motor drive waveforms were taken with no video input (unused video 3 selected). - Page 24 2. Releases RGB bursts of video signal from the video separator within the DDP1011 to the DMD device (L board). The RGB video signal bursts are now locked to the colors on the wheel. 3. Enables the ballast (lamp) to operate (see ballast section of this book). The 180Hz Color Wheel sync signal is doubled to 360 Hz (by DDP1011 on the L board) before being used as the ballast enable signal (“Lamp En”...
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Page 25: Output Waveforms
Output Waveforms Conditions for the color wheel output waveforms of figure 15: 1. These three waveforms appear right after the color wheel rotates (channel 1) and the TV powers on (channels 2 & 3). 2. The amplitude of the channel 1 Color Wheel signal (180 Hz) is 5Vp-p, but the data and clock signal output (channels 2 &... - Page 26 Adjustment Procedure: 1. Refer to the service mode portion of this training guide to enter the extended service mode as shown in figure 16 (enter the basic service mode, then press additional buttons for the extended service mode). Figure 16 - Extended Service Mode 2.
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Page 27: Ballast Circuit
Ballast Circuit This chapter of the book is divided into 6 sections: 1. Lamp On Sequence Chart 4. Ballast Block Operation 2. Ballast Board Layout 5. Testing the Lamp and Ballast 3. Ballast Board turn-on voltages 6. L Board LED Indicators Lamp On Sequence Chart Lamp On Operation... -
Page 28: Ballast Block Operation
Ballast On Requirements Name Voltage Location Ground 1. Input supply voltage +335Vdc B1/pin 1 CN005 or B1/pin 3 2. Input 2Vdc from microprocessor * 2Vdc / 4Vp-p * B2/pin 1 Chassis (cold gnd) * This 2Vdc becomes a 372 Hz 4Vp-p pulse after the lamp turns on. Table 11 Ballast Block Operation As you can conclude from the turn-on sequence in table 9, once the microprocessor... -
Page 29: Inform The Microprocessor That The Lamp Is On And
The third sub-circuit monitors the MOSFET / lamp current and adjusts voltage to maintain a constant operating current for consistent brightness. This last sub-circuit also informs the microprocessor if a defective (unlit) lamp is not drawing current. Figure 18 - Ballast Block Diagram •... -
Page 30: Testing The Lamp & Ballast
5Vdc = ballast / lamp-on) command but does not receive a lamp-on response (B2/pin 3 = 0Vdc) within 4 seconds, the microprocessor terminates the original ballast-on command. After 38 seconds, the ballast / lamp-on command is repeated, in an attempt to re-trigger the failed lamp. - Page 31 Spark gap Z001 Vented ballast shield (moved) Figure 20 - Spark Gap located on the Ballast Board b) Ballast test 2 - Forced ballast on – Normally, the microprocessor turns on the ballast and in turn, the ballast turns on the lamp within 5 seconds from pressing the power-on button.
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Page 32: Microprocessor Test
Forced Ballast On Procedure: The purpose is to prove that the ballast and the lamp are good (for a TV repair estimate) in a situation where the total damage to the TV is unknown. Procedure: Refer to figures 21 & 22. 1. -
Page 33: L Board Led Indicators
1. Open the shield on the ballast assembly and locate connector B2/pin 1. 2. Using any shield as cold ground, monitor the voltage at B2/pin 1. 3. Turn on the TV. The B2/pin 1 voltage from the microprocessor should be 3Vdc at turn-on. -
Page 35: Defective Lamp Symptoms, Replacement, & Time Reset
Defective Lamp Symptoms, Replacement, & Time Reset Lamp End of Life Symptoms Two symptoms can occur requiring lamp replacement: Lamp Failure Symptoms Symptom Problem Remedy 1. The front panel Lamp LED Lamp is cracked or not Test the ballast (see notice). blinks (red) without pause. -
Page 36: Lamp Replacement
Spark gap Z001 Perforated ballast shield (removed) Figure 25 - Spark gap location on the Ballast board Lamp Replacement: The lamp is located behind the front decorative 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 Lamp door Captive... -
Page 37: Lamp Time Reset
1. Pull off the decorative front panel to expose the lamp door (figure 26). 2. Loosen the captive screw and remove the door to access the lamp assembly. 3. Remove the 1” screw that secures the lamp assembly (not shown) and pull the lamp out. -
Page 39: Protection Circuits - Shutdown Causes
Protection Circuits – Shutdown Causes Overview Ant one of the seven TV problems shown in Figure 29 (and listed in table 13) can shutdown the TV, requiring the TV to be unplugged to reset. A typical shutdown sequence is: 1. Power-on – Green power LED blinks 2. -
Page 40: Shutdown Block Diagram
Shutdown Block Diagram You can verify shutdown trigger voltages just prior to shutdown at the DG board pins shown in figu re 30 and listed in table 13. This will prove that there is a valid shutdown signal and shutdown is not caused by a problem within the DG board. A descriptio n of each shutdown circuit follows this block diagram so that you can work backwards to the... -
Page 41: Shutdown - Power Led Blinks 1X
Shutdown - Power LED Blinks 1X Refer to figure 31. If the power LED blinks 1X and repeats, the problem is caused by a short or abnormal load on the the 30V, 12V, 9V, or 3.3V line. The current of the power supply’s 30V line is monitored by Q845. -
Page 42: Shutdown - Power Led Blinks 2X
Shutdown - Power LED Blinks 2X Refer to figure 32. If the power LED blinks 2X and repeats, the problem is caused by excessive voltage from one of the 3 regulators in the power supply. The 12V, 9V, and 3.3Vdc lines from the power supply are monitored by zener diodes D852, D856, and D854 respectively. - Page 43 Shutdown - Power LED Blinks 3X Shutdown - Power LED Blinks 3X If If the power LED blinks 3X and repeats, the problem is caused by non-detected fan the power LED blinks 3X and repeats, the problem is caused by non-detected fan rotation.
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Page 44: Shutdown - Power Led Blinks 5X
Shutdown - Power LED Blinks 5X Refer to figure 34. If the power LED blinks 5X and repeats, the problem is caused due to no lamp current detection after the ballast was instucted to turn on. The shutdo path diagram is shown in figure 34 but start the repair by refering to figure 35 that shows the 4 LED indicators on the L board. -
Page 45: Shutdown - Power Led Blinks 6X, 7X, Or 8X
Shutdown - Power LED Blinks 6X, 7X, or 8X 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. -
Page 46: Shutdown - Power Led Blinks Continously
Shutdown - Power LED Blinks continously If the power LED blinks continously, the problem is eith er an open lamp door switch or n open thermal circuit breaker located above the lamp housing. Refer to figure 38. Both switches can be checked at plug P4. The thermal breaker is reset by pres sing the button at the center between its two terminals. -
Page 47: Video Signal Flow
Video Signal Flow Refer to figure 40. Most of the video processing is performed on the H and DG (digital) boards. In the analog (H, G, and TU) boards, the video signal is approximately 1Vp-p throughout. The analog video signal can be traced using the service manual block diagram. -
Page 48: Video Output From Lvds Interface Ic
Video Output from LVDS Interface IC Before the RGB digital video signal leaves the main TV chassis (DG Bd.), it is translated into a lower voltage, scrambled, and becomes a differential output signal in IC4801. The destination is the light box digital circuit board (receiver, IC6001) where the RGB signals are unscrambled and returned to 8 bit R, G, &... -
Page 49: Loss Of Lvds Signal
Loss of LVDS Signal 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. Noise in solid color area Noise in sky blue Figure 42 - Loss of a LVDS video signal... -
Page 51: Appendix
Appendix Service Mode Functions & Access There are two service modes. Lamp time and reset are available in the basic service mode. Patterns and adjustments are accessed from the extended service mode. Enter the basic service mode to get to the extended service mode. Exit either service mode by shutting off the TV. -
Page 52: Entry To Extended Service Mode
Resetting the lamp time to 0: From within the service mode, hold in the VOLUM E-DOWN button on the front panel and simultaneously hold down the MUTE button on the remote control. Continue to hold (for approx. 3 seconds) until the lamp time resets to zeros. See figure 45. 0008A 00000000 00 00000 001F... -
Page 53: Hexadecimal Conversion
Hexadecimal Conve rsion Hexadecimal numbers are like decimal numbers until after number 9. After 9, hexadecimal numbers continue with letters A to F, so F represents 15 (hence the pre “hex”). After F, the number sequence carries over so the next hex number, 10 is decimal 16. -
Page 54: Disabling The Lamp
III. Disabling the Lamp: To troubleshoot the TV’s power supply, or A/V circuitry, keep the TV on but sto p the lamp from generating unnecessary heat and blinding light. This procedure will cause the microprocessor into thinking that the ballast is working so that the TV remains elect the desired input for testing from the OSD menu before you disable the lamp. -
Page 55: Screen Replacement
IV. Screen Replacement To avoid diminished light output always place the screen’s label (part) numbers on to of each other. Refer to figure 48. Figure 48 - Screen mounted into the Bezel PT60DL54 PT50DL54 Lenticular LSGP0365 LSGP0373 Fresnel TKG2AH50741 LSGP0374... -
Page 56: Side A/V Input Board Removal
Side A/V Input Board Removal Although the side input board can be removed from the back, it is not possible to re- insert it that way without damage. Refer to figure 49. o properly access the side input board, remove the front light gray (silver) panel that holds the power-on pushbuttons. -
Page 57: How To Use The Eeprom Copy Jig
How to use the EEPROM Copy Jig The TXFLIG02SER EEPROM copy jig is used to copy the TV data to / from the jig (temporary storage) in the extended service mode. This is useful if the replacement DG board does not have the same data as the old DG board. Procedure: Refer to figure 50. -
Page 58: L Board Replacement & Alignment
VII. L Board Replacement & Alignment The L board contains the DMD IC with the microprocessor mirrors in the DLP light engine. Picture centering is necessary after replacing the Light Eng ine’s “L” Board. emoval Procedure Refer to figure 51. 1. -
Page 59: Alignment After Light Engine Assembly Replacement
VIII. Alignment after Light Engine Assembly Replacement After the light engine replacement, check and adjust the mechanical lens position, mechanic al lens focus, & electrical picture position if necessary: Adjustments after Light Engine Assembly Replacement Adjustment Using Test Equipment 1. Mechanical Position Front panel access port Cross hair pattern generator 2. - Page 60 If the cross hatch lines are not at the notches, the top & bottom lines must be at equal distances from the notches, as long as the lines are vertical and horizontal. Retight the four lens-mounting screws. Loosen 4 screws for lens positioning Lens Focus knob Figure 54 - Access port...
- Page 61 Entry to Extended Service Mode: 10. On the remote control, press the power-on/off button (while in the service mode) The TV will not turn off bu t enter the extended service mode as shown in figure 55. The cross hair will remain on the screen. Figure 55 - Extended Service Mode for H &...