Panasonic PT-L785U Service Manual
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Panasonic PT-L785U Service Manual

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PT-L785U
PT-L785E
© 2004 Matsushita Electric Industrial Co., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. VED0407354C0
D10
LCD Projector
Unauthorized
copying
and

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Summary of Contents for Panasonic PT-L785U

  • Page 1 ORDER NO. VED0407354C0 LCD Projector PT-L785U PT-L785E © 2004 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.
  • Page 2 PT-L785U / PT-L785E...
  • Page 3 PT-L785U / PT-L785E CONTENTS Page Page 1 Safety Precautions 1.1. General Guidelines...

  • Page 4: Table Of Contents

    PT-L785U / PT-L785E 1.2. Leakage Current Check 8.13. LCD Panel Combination 1.3. UV Precaution and UHM Lamp Precautions 8.14. Replacement of Polarizer 2 Ext Option 8.15. Replacement of PBS Array (Analysis Block) 2.1. Procedure to enter EXT OPTION 8.16. Removal of lamp Unit 2.2.

  • Page 5: Leakage Current Check

    PT-L785U / PT-L785E 3. Connect M1 to T1 according to Fig. 2 and measure the 1 Safety Precautions voltage. 4. Change the connection of M1 from T1 to T2 and measure 1.1. General Guidelines the voltage again. · For continued safety, no modification of any circuit must be 5.

  • Page 6: Ext Option

    PT-L785U / PT-L785E 2 Ext Option This projector has EXT OPTION in addition to standard on-screen menus. · There are SELF CHECK and TEST PATTERN (Service Mode) for service, etc. 2.1. Procedure to enter EXT OPTION 1. Press "MENU" button on the main unit or remote control unit to display "MENU" screen.

  • Page 7: Self Check Display And Contents

    PT-L785U / PT-L785E 3.2. Self Check Display and Contents 3.3. Canceling the self-check mode Press "MENU" button on the main unit or remote control unit. 4 Service Mode This mode is used to display five kinds of test patterns [Horizontal lines, Vertical lines, Dots, Crosshatch and White (No pattern)]...

  • Page 8: Procedure To Enter The Service Mode

    PT-L785U / PT-L785E Note: · On the service mode, displays above patterns by each color without test equipment such as PC or SG. Use the service mode for simplified adjustments by your eyes and so on. 4.1. Procedure to enter the service mode Select "TEST PATTERN"...

  • Page 9: Connection

    PT-L785U / PT-L785E communication software on the market, and inputs control commands according to communication settings and basic format below. 6.1. Connection Note: Use a proper communication cable which is suitable for the PC to connect SERIAL connector and the PC.

  • Page 10: Control / Query Commands

    PT-L785U / PT-L785E the next command. · When a command which does not require parameters is sent, the colon (:) is not required. 6.5. Control / Query Commands Control Commands...
  • Page 11 PT-L785U / PT-L785E Query Commands...

  • Page 12: Communication Cable Specifications

    PT-L785U / PT-L785E Parameters [Example] When controls the audio volume to +30 by a PC (Sends commands as the following:) · When a command which does not require parameters is sent, the colon (:) is not required. 6.6. Communication Cable Specifications...

  • Page 13: Signal Selector Connecting Cable Specifications

    PT-L785U / PT-L785E 6.7. Signal Selector Connecting Cable Specifications When connecting to a signal selector (ex. TW-SW S62J), use a cable with specifications below. Connecting method: Connects a video signal cable from the signal selector to "VIDEO IN", and an RGB signal cable to "RGB1 IN".

  • Page 14: Disassembly Instructions

    PT-L785U / PT-L785E 8 Disassembly Instructions Warning: · Be sure to unplug the power cord from the power outlet before disassembling this projector. Caution: · While turning over a printed circuit board, be sure to put a insulating material under it to prevent a short circuit.

  • Page 15: Removal Of Upper Case

    PT-L785U / PT-L785E 8.2. Removal of Upper Case 1. Turn the projector upside down. 2. Loosen the 2 screws until they idle, open the air outlet port. 3. Unscrew the 7 screws. 8.4. Removal of R-P.C.Board 1. Remove the upper case according to the section 8.2.

  • Page 16: Removal Of P-Module)

    PT-L785U / PT-L785E 5. Disconnect the connectors from/to the A-P.C.Board. 8.6. Removal of P-Module) 6. Take the A-P.C.Board block out from the main unit of the 1. Take the A-P.C.Board block out according to the steps 1 projector. through 6 in the section 8.5. "Removal of A-P.C.Board".

  • Page 17: Removal Of Ballast Unit (B / Q-Module)

    PT-L785U / PT-L785E 6. Unscrew the 2 screw and remove the socket cover, then remove the lamp unit terminal. 7. Unscrew the 3 screw and remove the power block. 8.7. Removal of Ballast Unit (B / Q- Module) 1. Remove the power block, then separate the power unit and the ballast unit according to the steps 1 through 8 in the section 8.6.

  • Page 18: Removal Of Analysis Block

    PT-L785U / PT-L785E Note: 6. Unscrew the 2 screws and remove the socket cover, then · Under this condition, the repair and the parts remove the lamp unit terminal. replacement of the K-Module are possible. 8.9. Removal of Analysis Block 1.

  • Page 19: Removal Of Lcd Block

    PT-L785U / PT-L785E 5. Unscrew the 4 screws and remove the LCD block. 9. Unscrew the 2 screws and remove the LCD block. 8.11. Replacement of LCD Panel 8.10. Removal of LCD Block 1. Remove the LCD block according to the section 8.10.

  • Page 20: Lcd Panel Discrimination

    PT-L785U / PT-L785E 4. Reassemble the projector in the reverse order of 8.12. LCD Panel Discrimination disassembling, but leave the upper case and the screws fixing the A-P.C.Board block as they are removed. ID-tag seal color LCD panel LCD panel (R) 5.

  • Page 21: Replacement Of Polarizer

    PT-L785U / PT-L785E 8.14. Replacement of Polarizer 1. Take the A-P.C.Board block out according to the steps 1 through 6 in the section 8.5. "Removal of A-P.C.Board". 2. Mark positions of the polarizer (R/G/B). Note: · Mark accurately as possible because the marks will be used for resetting the polarizer position.

  • Page 22: Removal Of Lamp Unit

    PT-L785U / PT-L785E 2. Loosen the 2 screws until they idle and remove the lamp unit. Notes: · When attaching a new PBS array, be careful not to mistake the direction. · Work with care not to touch the surface of PBS Array.

  • Page 23: Measurement And Adjustments

    PT-L785U / PT-L785E 9 Measurement and Adjustments 9.1. Adjustment Procedure Flowchart attachment and screw them temporarily just until the LCD 9.2. Cautions for Adjustment panel can be shifted by your fingers. 2. Reassemble the projector in the reverse order of disassembling, but leave the upper case and the screws ·...

  • Page 24: Lighting Area Adjustment

    PT-L785U / PT-L785E 9.4.3. Adjustment after LCD Panel (G) Replacement 1. Display the white crosshatch pattern and adjust the lens focus. 2. Adjust the LCD panel (G) to merge the green pattern with the red and blue ones. 9.4.4. Adjustment after LCD Panel (R) Replacement 1.
  • Page 25 PT-L785U / PT-L785E 3. Covering with an insulator (cloth or the like) to prevent a short circuit, set the A-P.C.Board on the main unit. Note: · Handle with care not to apply external force to connecting parts which connect the main unit and A- 9.5.3.

  • Page 26: Software For Adjustment

    PT-L785U / PT-L785E color unevenness on the screen by shifting the levers in 9.6.3. Port Name Selection Menu arrow directions. 4. Tighten each screw. 9.5.3.3. R Reflector Adjustment 1. Turn on the power and display 100 % white pattern on the screen.

  • Page 27: Flicker Adjustment

    PT-L785U / PT-L785E Gamma Data Reception: 9.6.5. Adjustment Menu Receives the gamma data from the projector and writes it in the file. Uniformity Data Transmission: Reads the color unevenness correction data from the file and transmits it to the projector.

  • Page 28: Rgb Input Level Adjustment

    PT-L785U / PT-L785E releasing the mouse or key after pressing it continuously, 9.7.3. Equipment to be used the data is transmitted once. The variable setting value is enclosed ina box and using the TAB or SPACE key allows PC, Software for Adjustment the move of the box.

  • Page 29: Troubleshooting

    PT-L785U / PT-L785E 10 Troubleshooting...
  • Page 30 PT-L785U / PT-L785E...
  • Page 31 PT-L785U / PT-L785E...
  • Page 32 PT-L785U / PT-L785E...
  • Page 33 PT-L785U / PT-L785E...
  • Page 34 PT-L785U / PT-L785E...
  • Page 35 PT-L785U / PT-L785E...
  • Page 36 PT-L785U / PT-L785E...
  • Page 37 PT-L785U / PT-L785E...
  • Page 38 PT-L785U / PT-L785E...
  • Page 39 PT-L785U / PT-L785E...
  • Page 40 PT-L785U / PT-L785E...
  • Page 41 PT-L785U / PT-L785E...
  • Page 42 PT-L785U / PT-L785E...

  • Page 43: Interconnection Block Diagram

    PT-L785U / PT-L785E 11 Interconnection Block Diagram 11.1. Interconnection Block Diagram (1 / 2) Interconnection Block Diagram (1/2) S-P.C.Board J-P.C.Board Q-Module B/Q-Module B-Module P-Module K-Module R-P.C.Board...

  • Page 44: Interconnection Block Diagram (2 / 2)

    PT-L785U / PT-L785E 11.2. Interconnection Block Diagram (2 / 2) Interconnection Block Diagram (2/2) A-P.C.Board...

  • Page 45: Block Diagram

    PT-L785U / PT-L785E 12 Block Diagram 12.1. Power Supply Power Supply COLD THERMO- FUSE F002 FAN 14 V SMOOTHING POWER INTERLOCK FILTER FAN 14 V RECTIFIER FACTOR SWITCH CORRECTION SMOOTHING 17 V IC202 SWITCHING K-Module TRANS. IC102 SMOOTHING +380 V AC IN A-P.C.Board...

  • Page 46: Signal Processing (1 / 3)

    PT-L785U / PT-L785E 12.2. Signal Processing (1 / 3) Signal Processing (1/3) from/to (3/3) IC1023 IC1021 IC1063 IC1061 Rout PLLHS IC1064 Rin1 PLLVS Gout FLASH Gin1 RESET Bout Bin1 RGB1_3 A / D RGB 1 CONVERTER, IC1026-IC1028, VIDEO MICROPROCESSOR, SWITCH...

  • Page 47: Signal Processing (2 / 3)

    PT-L785U / PT-L785E 12.3. Signal Processing (2 / 3) Signal Processing (2/3) IC1106 IC1105 1H INVERTER, SAMPLING HOLD LCD PANEL (R) IC1109 LEVEL COLOR UNEVENNESS SHIFT DCLK CORRECTION, LCD CONTROL IC1107 1H INVERTER, SAMPLING IC1110 HOLD IC1067 LEVEL IC1115 SHIFT...

  • Page 48: Signal Processing (3 / 3)

    PT-L785U / PT-L785E 12.4. Signal Processing (3 / 3) Signal Processing (3/3) J-P.C.Board IC1022 IC3022 Rin1 Rout IC3023 IC3024 RGB 3 Gout Gin1 Bout Bin1 Q3008 Q3006 EXT_PWR Q1013 EXT_CH2 Q3007 EXT_CH3 REMOTE RGB1_3 EXT_CH1 Q3005 Q3004 DVI-D IC1036 ADAPTER A-P.C.Board...

  • Page 49: Schematic Diagram

    PT-L785U / PT-L785E 13 Schematic Diagram...

  • Page 50: A-P.c.board (1 / 8)

    PT-L785U / PT-L785E 13.1. A-P.C.Board (1 / 8) A-P.C.Board TXANP04VJX7 (1/8)

  • Page 51: A-P.c.board (2 / 8)

    PT-L785U / PT-L785E 13.2. A-P.C.Board (2 / 8) A-P.C.Board TXANP04VJX7 (2/8)

  • Page 52: A-P.c.board (3 / 8)

    PT-L785U / PT-L785E 13.3. A-P.C.Board (3 / 8) A-P.C.Board TXANP04VJX7 (3/8)

  • Page 53: A-P.c.board (4 / 8)

    PT-L785U / PT-L785E 13.4. A-P.C.Board (4 / 8) A-P.C.Board TXANP04VJX7 (4/8)

  • Page 54: A-P.c.board (5 / 8)

    PT-L785U / PT-L785E 13.5. A-P.C.Board (5 / 8) A-P.C.Board TXANP04VJX7 (5/8)

  • Page 55: A-P.c.board (6 / 8)

    PT-L785U / PT-L785E 13.6. A-P.C.Board (6 / 8) A-P.C.Board TXANP04VJX7 (6/8)

  • Page 56: A-P.c.board (7 / 8)

    PT-L785U / PT-L785E 13.7. A-P.C.Board (7 / 8) A-P.C.Board TXANP04VJX7 (7/8)

  • Page 57: A-P.c.board(8 / 8)

    PT-L785U / PT-L785E 13.8. A-P.C.Board(8 / 8) A-P.C.Board TXANP04VJX7 (8/8)

  • Page 58: B-Module (1 / 2)

    PT-L785U / PT-L785E 13.9. B-Module (1 / 2) B-Module TXANPBQVJX7 (1/2) Module Replacement Only supplied components IC9601-03, Q9603-11, Q9614, D9601, D9604-09, D9611-12, R9601, C9610, C9617-19, L9604-05, T9604, S9602, TXJ/L2VJX7...

  • Page 59: B-Module (2 / 2)

    PT-L785U / PT-L785E 13.10. B-Module (2 / 2) B-Module TXANPBQVJX7 (2/2) Module Replacement Only supplied components IC9601-03, Q9603-11, Q9614, D9601, D9604-09, D9611-12, R9601, C9610, C9617-19, L9604-05, T9604, S9602, TXJ/L2VJX7...

  • Page 60: J-P.c.board, S-P.c.board

    PT-L785U / PT-L785E 13.11. J-P.C.Board, S-P.C.Board J-P.C.BOARD TNPA2624 S-P.C.BOARD TNPA2546...

  • Page 61: Circuit Boards

    PT-L785U / PT-L785E 14 Circuit Boards 14.1. A-P.CBoard (Foil Side) [A] A-P.C.Board TXANP04VJX7 (Foil Side) A-P.C.Board (Foil Side) IC1001 IC1052 IC1083 IC1002 IC1054 IC1087 IC1008 IC1055 IC1088 IC1009 IC1061 IC1102 IC1010 IC1062 IC1104 IC1011 IC1063 IC1106 IC1012 IC1064 IC1107 IC1022...

  • Page 62: A-P.cboard (Component Side)

    PT-L785U / PT-L785E 14.2. A-P.CBoard (Component Side) [A] A-P.C.Board TXANP04VJX7 (Component Side) A-P.C.Board (Component Side) IC1004 IC1039 IC1090 IC1005 IC1053 IC1091 IC1006 IC1056 IC1101 IC1007 IC1067 IC1105 IC1021 IC1070 IC1108 IC1025 IC1071 IC1109 IC1026 IC1074 IC1110 IC1027 IC1076 IC1113 IC1028...

  • Page 63: J-P.c.board / S-P.c.board

    PT-L785U / PT-L785E 14.3. J-P.C.Board / S-P.C.Board J-P.C.Board TNPA2624 S-P.C.Board TNPA2546 (Foil Side) (Foil Side) J-P.C.Board TNPA2624 S-P.C.Board TNPA2546 (Component Side) (Component Side) J-P.C.Board(Component Side) S-P.C.Board(Component Side) TRANSISTOR IC3022 IC3023 Q3501 Q3504 IC3024 Q3502 Q3505 Q3503 TRANSISTOR ADDRESS INFORMATION Q3004...
  • Page 64 PT-L785U / PT-L785E...

  • Page 65: Terminal Guide Of Ics And Transistors

    PT-L785U / PT-L785E 15 Terminal guide of ICs and transistors...

  • Page 66: Exploded Views

    PT-L785U / PT-L785E 16 Exploded Views...
  • Page 67 PT-L785U / PT-L785E...
  • Page 68 PT-L785U / PT-L785E...
  • Page 69 PT-L785U / PT-L785E...

  • Page 70: Replacement Parts List

    PT-L785U / PT-L785E 17 Replacement Parts List Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks TEEC5088-1 PBS DUCT [MECHANICAL PARTS] TEEC5089 PBS COVER TEEC5090-1 SOCKET COVER AJ7241B POWER SWITCH TEFC5021-1 SHIELD BOARD (K-PCB)
  • Page 71 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks TMKX715 POWER INSULATION XUC3FY WASHER SHEET(1) XYN2+F6 SCREW TMKX716 POWER INSULATION XYN3+F16 SCREW SHEET(2) XYN3+F20FZ SCREW TMME090 SPACER XYN3+F6 SCREW TMME154...
  • Page 72 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks IC1073 C3EBLC000019 Q1026 2SB1218A TRANSISTOR IC1074 C0JBAA000146 Q1027 2SB1218A TRANSISTOR IC1075 C0DBZHE00019 Q1028 2SB1218A TRANSISTOR IC1079 C0DBZJD00003 Q1029 2SB1218A TRANSISTOR IC1080...
  • Page 73 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks D1016 MA3056M ZENER DIODE MAZ30560M D9609 MA2Z72000L DIODE D1017 MA3056M ZENER DIODE MAZ30560M D9611 MA158 DIODE MA3X158 D1018 MA3150M DIODE MAZ31500M...
  • Page 74 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks L1069 J0JJC0000022 EMI FILTER R1005 ERJ3GEYJ152 M 1.5KOHM,J,1/16W L1070 J0JJC0000022 EMI FILTER R1006 ERJ3GEYJ221 M 220 OHM,J,1/16W L1071 J0JJC0000022 EMI FILTER...
  • Page 75 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R1080 ERJ3GEYJ473 M 47K OHM,J,1/16W R1153 ERJ3GEYJ103 M 10K OHM,J,1/16W R1081 ERJ3GEYJ473 M 47K OHM,J,1/16W R1154 ERJ3GEYJ103 M 10K OHM,J,1/16W R1082...
  • Page 76 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R1225 ERJ3GEYJ103 M 10K OHM,J,1/16W R1298 ERJ3EKF1500 M 150 OHM, 0.063W R1226 ERJ3GEYJ103 M 10K OHM,J,1/16W R1299 ERJ3EKF1500 M 150 OHM, 0.063W...
  • Page 77 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R1501 ERJ6GEYJ100 M 10 OHM,J,1/10W R1594 ERJ3GEYJ103 M 10K OHM,J,1/16W R1504 ERJ3GEYJ103 M 10K OHM,J,1/16W R1595 ERJ6ENF3300 M 330 OHM, 1/10W...
  • Page 78 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R1693 ERJ3GEYJ101 M 100 OHM,J,1/16W D0GB101JA00 R1840 ERJ3GEYJ103 M 10K OHM,J,1/16W R1841 ERJ3GEYJ103 M 10K OHM,J,1/16W R1694 D1HG2208A002 RESISTOR R1842 ERJ3GEY0R00...
  • Page 79 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R1924 ERJ3GEYJ220 M 22 OHM,J,1/16W R3502 ERJ6ENF5601 M 5.6KOHM, 1/10W R1925 ERJ3GEY0R00 M 0 OHM, 1/16W R3503 ERJ6ENF1001 M 1KOHM, 1/10W...
  • Page 80 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C1034 EEVHB0G101 E 100UF, 4V C1111 ECJ1XB1C103K C 0.01UF, K, 16V C1035 ECJ1XF1C104Z C 0.1UF, Z, 16V C1112 EEVHB0J330 E 33UF, 6.3V...
  • Page 81 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C1188 ECJ3XF1C475Z C 4.7UF, Z, 16V C1264 ECUX1H120JCV C 12PF, 50V C1189 ECJ3XF1C475Z C 4.7UF, Z, 16V C1265 ECUX1H120JCV C 12PF, 50V...
  • Page 82 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C1440 ECJ0EF1C104Z C 0.1UF, 16V C1544 F4D276050001 CAPACITOR C1441 ECJ0EF1C104Z C 0.1UF, 16V C1545 F4D276050001 CAPACITOR C1442 ECJ0EF1C104Z C 0.1UF, 16V...
  • Page 83 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C1658 ECJ1XF1E104Z C 0.1UF, Z, 25V C1811 ECJ0EF1C104Z C 0.1UF, 16V C1659 ECJ1XF1E104Z C 0.1UF, Z, 25V C1812 ECJ1XF1C104Z C 0.1UF, Z, 16V...
  • Page 84 PT-L785U / PT-L785E Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks S3505 EVQPLHA15 SWITCH [OTHERS] S3506 EVQPLHA15 SWITCH S3507 EVQPLHA15 SWITCH K1MN30B00115 30P CONNECTOR S3508 EVQPLHA15 SWITCH K1MN30B00115 30P CONNECTOR S3509 EVQPLHA15...

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