Panasonic PT-LB20NTU, PT-LB20NTE, PT-LB20NTEA, PT-LB20U, PT-LB20E Service Manual

...

PT-LB20NTU PT-LB20NTE PT-LB20NTEA PT-LB20U PT-LB20E PT-LB20EA PT-LB20SU

ORDER NO. VED0504362C0

D10

LCD Projector

PT-LB20SE PT-LB20SEA PT-LB20VU PT-LB20VE PT-LB20VEA

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

CONTENTS

Page Page

1 Safety Precautions 5 1.1. General Guidelines 5

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

1.2. Leakage Current Check 5

1.3. UV Precaution and UHM Lamp Precautions

2 Ext Option

2.1. Procedure to enter EXT OPTION

2.2. EXT OPTION Menu and Functions

2.3. Canceling EXT OPTION

3 Self-Check Mode

3.1. Procedure to enter the self-check mode

3.2. Self Check Display and Contents

3.3. Canceling the self-check mode

4 Service Mode

4.1. Procedure to enter the service mode

4.2. Canceling the service mode

5 Flicker Adjustment Mode

5.1. Procedure to enter the adjustment mode

5.2. Adjustment Display and Contents

5.3. Canceling the flicker adjustment mode

6 Using the SERIAL Connector

6.1. Connection

6.2. Pin Layout and Signal Names for SERIAL Connector

6.3. Communication Settings

6.4. Basic Format

6.5. Control / Query Commands

6.6. Communication Cable Specifications

6.7. Signal Selector Connecting Cable Specifications

7 Disassembly Instructions

7.1. Printed Circuit Board and Main Parts Location

7.2. Removal of Upper Case

7.3. Removal of A-P.C.Board

7.4. Removal of WL-P.C.Board (PT-LB20NTU/E/EA only)

7.5. Removal of S1-P.C.Board

7.6. Removal of S2-P.C.Board

7.7. Removal of K-P.C.Board

7.8. Removal of B/Q-Module

7.9. Removal of P-Module

7.10. Removal of Lamp Unit

7.11. Removal of Analysis Block and Lens

7.12. Removal of LCD Block

7.13. Replacement of LCD Panel

7.14. LCD Panel Discrimination

7.15. LCD Panel Combination

7.16. Replacement of Incidence Polarizer (R and B)

7.17. Replacement of Incidence Polarizer (G)

6 6 7

7 8 8

9 9

9 9 9

10 10 10 11 11 13 14

15 16 16 17 17 17 17 18 18 19 19 20 20 21 21

7.18. Replacement of Projection Polarizer

7.19. Replacement of PBS Array (Analysis Block)

8 Measurement and Adjustments

8.1. Adjustment Procedure Flowchart

8.2. Cautions for Adjustment

8.3. Setting Before Adjustment

8.4. Convergence Adjustment

8.5. Lighting Area Adjustment

8.6. Software for Adjustment

8.7. Flicker Adjustment

8.8. Input Level Adjustment

8.9. Model Information Setup

9 Troubleshooting 10 Int erc onnection Bloc k Diagram

10.1. Interconnection Block Diagram (1/2)

10.2. Interconnection Block Diagram (2/2)

11 Block Diagram

11.1. Power Supply

11.2. Signal Processing (1/3)

11.3. Signal Processing (2/3)

11.4. Signal Processing (3/3)

12 Schematic Diagram

12.1. A-P.C.Board (1/4)

12.2. A-P.C.Board (2/4)

12.3. A-P.C.Board (3/4)

12.4. A-P.C.Board (4/4)

12.5. WL-P.C.Board (1/2)

12.6. WL-P.C.Board (2/2)

12.7. B-Module (1/2)

12.8. B-Module (2/2)

12.9. K-P.C.Board

12.10. S1-P.C.Board, S2-P.C.Board

13 C irc uit Boards

13.1. A-P.C.Board (Foil Side) / WL-P.C.Board (Foil Side/Component Side)

13.2. A-P.C.Board (Component) / S1-P.C.Board (Foil Side/Component Side)

14 Te rm inal guide of ICs and transis tors 15 Ex ploded Views 16 Replacement Parts List

22 22 23

24 24 24 24 25 27 28 28 29

30 41

41 42

43 44 45 46

48 49 50 51 52 53 54 55 56 57

61 62 65

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

1 Safety Precautions

1.1. General Guidelines

· For continued safety, no modification of any circuit must be

attempted.

· Unplug the power cord from the power outlet before

disassembling this projector.

· It is advisable to use an isolation transformer in the AC

power line before the service.

· Observe the original lead dress during the service. If a short

circuit is found, replace all the parts overheated or damaged by the short circuit.

· After the service, all the protective devices such as

insulation barriers, insulation papers, shields, and isolation R-C combinations must be properly installed.

· After the service, check the leakage current to prevent the

customer from getting an electric shock.

1.2. Leakage Current Check

1. Prepare the measuring circuit as shown in Fig.1. Be sure to use a voltmeter having the performance

described in Table 1.

3. Connect M1 to T1 according to Fig. 2 and measure the voltage.

4. Change the connection of M1 from T1 to T2 and measure the voltage again.

5. The voltmeter must read 0.375 V or lower in both of steps 3 and 4. This means that the current must be 0.75 mA or less.

6. If the reading is out of the above standard, the projector must be repaired and rechecked before returning to the customer because of a possibility of an electric shock.

1.3. UV Precaution and UHM Lamp

Precautions

· Be sure to unplug the power cord from the power outlet when replacing the lamp.

· Because the lamp reaches a very high temperature during its operation, wait until it cools completely when replacing the Lamp Unit.

· The lamp emits small amounts of UV-radiation, avoid directeye contact with the light.

· Because the high pressure lamp involves a risk of failure, never touch the lamp wire lead during the service. (See Fig.

Fig. 1

Table 1

Fig. 2

2. Assemble the circuit as shown in Fig. 2. Plug the power cord in a power outlet.

Fig.3

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

2 Ext Option

This projector has EXT OPTION in addition to standard on-screen menus.

· There are SELF CHECK and 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, then select "OPTION" and press "ENTER" button.

2. Select "OSD" on "OPTION" menu and press "ENTER" button 3 seconds or longer. MENU → OPTION → OSD

2.2. EXT OPTION Menu and Functions

· FREEZE MSG Switching ON/OFF "FREEZE" on-screen display

· ANGLE RESET Switching ON/OFF "AUTO KEYSTN (Automatic Keystone)" reference level setting

Note:

−

− Normally, do not select. (Angle reset data will be rewritten.)

− −

· FAN FULLMODE

Setting the cooling fan motor rotation speed

−

− Switching ON "FAN FULLMODE", the rotation level of the fan becomes high-speed rotation (fixed). Moreover, when "FAN

− −

FULLMODE" is ON, changing "FAN CONTROL" in OPTION becomes impossible (setting FAN FULLMODE is given priority more than FAN CONTROL).

· AUTOSETUP Setting AUTO SETUP mode

−

− STANDARD: To set the normal mode (the dot clock is adjusted strictly))

− −

−

− SPECIAL: To set the special mode (the dot clock is adjusted roughly)

− −

Note:

−

− Do not change the initial setting (STANDARD).

− −

· SYNC

Setting SYNC processing mode

−

− STANDARD: To set the normal mode

− −

−

− SPECIAL: To set the special mode (noise reduction mode)

− −

Note:

−

− Do not change the setting when it is possible to receive normally.

− −

Change the setting only when the image is not displayed normally because of the sync signal noise of connected equipment.

· SELF CHECK To enter the self-check mode

· SERVICE MODE To enter the service mode

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

· FLICKER ADJ

To enter the flicker adjustment mode

2.3. Canceling EXT OPTION

Press "MENU" button on the main unit or remote control unit.

3 Self-Check Mode

This mode is used to narrow down the location of the failure.

3.1. Procedure to enter the self-check mode

Select "SELF CHECK" on "EXT OPTION" menu and press "ENTER" button on the main unit or remote control unit.

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

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.

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

4 Service Mode

This mode is used to display seven kinds of test patterns [Horizontal lines, Vertical lines, Dots, Crosshatch, White cross, Black cross and White (No pattern)] in the four colors (White, Red, Green and Blue)..

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 "SERVICE MODE" on "EXT OPTION" menu and press "ENTER" button on the main unit or remote control unit.

Note:

· In the service mode, pressing the up-arrow "

left-arrow "

" or right-arrow " " button the color selection (White / Red / Green / Blue).

" or down-arrow " " button allows the test pattern selection and the

4.2. Canceling the service mode

Press "MENU" button on the main unit or remote control unit.

5 Flicker Adjustment Mode

If replacing the optical parts (Analysis / LCD / Lens block) of this projector and/or A-P.C.Board (assembly), enter the flicker adjustment mode and minimize the flicker.

5.1. Procedure to enter the adjustment mode

Select "FLICKER ADJ" on "EXT OPTION" menu and press "ENTER" button on the main unit or remote control unit.

Note:

"DESK setting (blue)" is displayed when entering the adjustment mode.

5.2. Adjustment Display and Contents

· Setting value is increased and decreased with the right-arrow " " and left-arrow " " buttons.

": Decrease, " ": Increase

−

− Adjust the setting value to minimize the flicker on the screen.

− −

−

− Execute the adjustment by 6 patterns below.

− −

· The pattern (adjustment display) is switched with the up-arrow "

": Forward direction, " ": Reverse direction

−

− There are 6 patterns of "DESK setting (blue)", "DESK setting (red)", "DESK setting (green)", "CEILING setting (blue)",

− −

"CEILING setting (red)" and "CEILING setting (green)".

−

− The setting value is saved into this projector when the pattern is switched.

− −

" and down-arrow " " buttons.

5.3. Canceling the flicker adjustment mode

Press "MENU" button on the main unit or remote control unit.

Note:

When "MENU" button is pressed, the setting value at that time is saved into this projector and the adjustment mode is canceled.

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

6 Using the SERIAL Connector

The serial connector which is on the back connector panel of the projector conforms to RS-232C standard. This projector can be controlled by a PC which is connected as shown in "6.1. Connection".

For controlling this projector by a PC, requires 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 the optional serial adapter, which is connected with SERIAL connector of this projector, and the PC.

6.2. Pin Layout and Signal Names for SERIAL Connector

Pin No Signal Name Contents

3 RXD Receive data 4 GND Ground 5 TXD Transmit data 1 --2 --- Connected internally 6 --7 --- NC 8 --- NC

6.3. Communication Settings

Signal Level Contents Description

Sync. method Asynchronous Synchronizes every 1 character (8 bits)

Baud rate Conforms to 9 600 bps Data transfer speed

Parity RS-232C None Error detection method

Character length standard 8bits Number of bit composing 1 character

Stop bit 1bit Uses stop bit when asynchronous method X parameter Not used S parameter Not used

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

6.4. Basic Format

The data sent from the PC to the projector is transmitted in the format shown below.

Notes:

· If sending multiple commands, check that a call back has been received from the projector for 1 command before sending

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

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

Query Commands

Parameters

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

[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

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

6.7. Signal Selector Connecting Cable Specifications

When connecting to a signal selector (ex. TW-SWS62J), 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".

Note:

Set VP control terminal switch of the signal selector to VP TYPE "B".

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

7 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.

· Printed circuit boards and wires must not be pulled forcibly, but be handled carefully.

· Connectors also must be handled carefully.

· After repairing this projector, be sure to put back the wires and connectors to the original condition.

7.1. Printed Circuit Board and Main Parts Location

Electrical Parts

Optical Parts

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

7.2. Removal of Upper Case

1. Turn the projector upside down.

2. Unscrew the 6 screws.

5. Disconnect the connectors from/to the A-P.C.Board.

6. Unscrew the 2 screws and remove the A-P.C.Board block with the S2-P.C.Board.

3. Return the projector to the normal position.

4. Lift the upper case upward (approx. 10 cm).

5. Disconnect the cable from S1-P.C.Board (connector A8 on A-P.C.Board) and remove the upper case.

7.3. Removal of A-P.C.Board

1. Remove the upper case according to the section 7.2. "Removal of Upper Case".

2. Unscrew the 1 screw on the backside and remove the connector cover.

3. Unscrew the 1 screw fixing the connector metal fittings on the backside.

4. Unscrew the 3 screws and remove the grounding metal (3).

7. Unscrew the 10 screws and remove the connector metal fittings.

Note:

· Because the S2-P.C.Board block is attached, work

carefully when removing the connector metal fittings.

8. While disconnecting the connector between A- and S2P.C.Boards, remove the S2-P.C.Board block.

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

7.4. Removal of WL-P.C.Board (PTLB20NTU/E/EA only)

1. Remove the upper case according to the section 7.2.

"Removal of Upper Case".

2. Unscrew the 4 screws and remove the shield cover and

wireless LAN module.

Notes:

· Because the wireless LAN module is connected with

the WL-P.C.Board, work carefully when removing it.

· When installing/detaching the antenna connector,

insert or pull out it straight along the center of the connector pin. It causes damage and/or poor contacting of the connector when forcibly installing/detaching it.

· Connect the connector from the antenna with the

original position (connector on the wireless LAN module) after reassembling.

3. Unscrew the 1 screw and remove the WL-P.C.Board.

7.6. Removal of S2-P.C.Board

1. Remove the S2-P.C.Board block according to the section

7.3. "Removal of A-P.C.Board".

2. Remove the holder while expanding the resin hooks outside.

Note:

· Work carefully not to damage the resin hook.

7.5. Removal of S1-P.C.Board

1. Remove the upper case according to the section 7.2. "Removal of Upper Case".

2. Remove the water-guide plate.

7.7. Removal of K-P.C.Board

1. Remove the analysis block, LCD block and lens according to the steps 1 through 3 in the section 7.11. "Removal of Analysis Block and Lens".

2. For PT-LB20NTU/E/EA, unscrew the 4 screws and remove the shield cover and wireless LAN module.

Notes:

· Because the wireless LAN module is connected with

the WL-P.C.Board, work carefully when removing it.

· When installing/detaching the antenna connector,

insert or pull out it straight along the center of the connector pin. It causes damage and/or poor contacting of the connector when forcibly installing/detaching it.

· Connect the connector from the antenna with the

original position (connector on the wireless LAN module) after reassembling.

3. For PT-LB20NTU/E/EA, unscrew the 2 screws and remove the WL-P.C.Board (with metal fittings for securing WL).

3. Unscrew the 2 screws and remove the S1-P.C.Board.

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

according to the section 7.4. "Removal of WL-P.C.Board".

3. For PT-LB20NTU/E/EA, unscrew the 2 screws and remove the metal fittings for securing WL.

4. Unscrew the screws (PT-LB20NTU/E/EA: 2, Others: 3) and remove the grounding metal (2).

5. Unscrew the 2 screws and remove the lamp unit terminal.

6. Unscrew the 3 screws and remove the lamp house and thermofuse attachmem t fittings.

7. Unscrew the 2 screws and remove the K-P.C.Board.

5. Unscrew the 2 screws and remove the lamp unit terminal.

6. Unscrew the 3 screws and remove the lamp house and thermofuse attachment fittings.

7. Unscrew the 1 screw and remove the exhaust fan and speaker block.

8. Unscrew the 2 screws and remove the B/Q-Module.

7.8. Removal of B/Q-Module

1. Remove the A-P.C.Board block according to the steps 1 through 6 in the section 7.3. "Removal of A-P.C.Board".

2. For PT-LB20NTU/E/EA, remove the WL-P.C.Board

7.9. Removal of P-Module

1. Remove the A-P.C.Board block according to the steps 1 through 6 in the section 7.3. "Removal of A-P.C.Board".

2. For PT-LB20NTU/E/EA, remove the WL-P.C.Board

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

according to the section 7.4. "Removal of WL-P.C.Board".

3. For PT-LB20NTU/E/EA, unscrew the 2 screws and remove the metal fittings for securing WL.

4. Unscrew the screws (PT-LB20NTU/E/EA: 2, Others: 3) and remove the grounding metal (2).

5. Unscrew the 2 screws and remove the P-Module.

Note:

· When installing the lamp unit (or a new one) in the

main unit, place it in a specified position and press the connector side and the opposite side of the lamp unit (arrow positions shown in the figure below), and confirm the lamp unit is inserted securely.

Then, tighten the 2 screws fixing the lamp unit, and attach the lamp unit cover.

7.10. Removal of Lamp Unit

1. Turn the projector upside down.

2. Loosen the 2 screws until they idle, remove the lamp unit cover.

3. Loosen the 2 screws until they idle, remove the lamp unit with the handle.

7.11. Removal of Analysis Block and Lens

1. Remove the lamp unit according to the section 7.10.

"Removal of Lamp Unit".

2. Remove the A-P.C.Board block according to the steps 1

through 6 in the section 7.3. "Removal of A-P.C.Board".

3. Unscrew the 3 screws and remove the analysis block, LCD

block and lens.

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

1. Remove the LCD block according to the section 7.12. "Removal of LCD Block".

2. Cut the 4 LCD panel installation spindles at the position A and remove the LCD panel.

3. Cut the 4 LCD panel installation spindles at the position B and remove them.

Notes:

· Work carefully not to apply external force around the

spindle part by using a cutter, cutting nipper or the like for cutting the spindle.

· Adjust the height after the spindle is cut to 1 mm or

less.

4. Unscrew the 4 screws A and remove the lens.

5. Unscrew the 2 screws B and remove the LCD block (the analysis block remains).

7.12. Removal of LCD Block

1. Remove the A-P.C.Board block according to the steps 1 through 6 in the section 7.3. "Removal of A-P.C.Board".

2. Unscrew the 2 screws and remove the LCD block.

Note:

· Be careful not to touch the surface of prism and LCD

panel.

7.13. Replacement of LCD Panel

· The procedure is described as an example of LCD panel (B).

4. Attach the base plate with 4 screws.

5. Tighten the 2 screws temporarily just until new LCD panel (with the panel attachment and panel adjuster) can be shifted by your fingers.

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

· Since the ID-tag seal is pasted to the FPC of LCD Panl, (R),

(G) or (B) can be easily identified by the color of the seal.

· Finally, identify the panel color by the part number printed

on the FPC.

6. Reassemble the projector in the reverse order of disassembling, but leave the upper case and the screws fixing the A-P.C.Board block as they are removed.

7. Adjust the convergence according to the section 8.4. "Convergence Adjustment".

8. After the adjustment, while paying attention not to vary the adjusting result, tighten the 2 screws (upper) fixing the panel attachment temporarily with a hexagon head wrench.

Notes:

· Prepare a hexagon head wrench processed short.

· Service tool (Part No. TZSH07010), hexagon head

wrench processed short, is available.

9. Remove the LCD block again.

10. Tighten the 3 screws fixing the panel attachment.

7.15. LCD Panel Combination

· Part number is printed on the FPC of LCD Panel.

· When replacing LCD Panel, use a component which has

the same part number as the original.

Model number LCD

PT-LB20NTU/E/EA PT-LB20U/E/EA

PT-LB20SU/E/EA G L5BDAXN00074

PT-LB20VU/E/EA G L5BDAXQ00249

panel

R L5BDAXQ00221

G L5BDAXQ00222

B L5BDAXQ00223

R L5BDAXN00073

B L5BDAXN00075

R L5BDAXQ00248

B L5BDAXQ00250

Part No.

(L3P07X-46G10)

(L3P07S-46G00)

(L3P06X-55G10)

7.16. Replacement of Incidence Polarizer (R and B)

11. Reassemble the projector as it was.

7.14. LCD Panel Discrimination

ID-tag seal color LCD panel

Red LCD panel (R) Blue LCD panel (B)

(No seal) LCD panel (G)

1. Remove the LCD block according to the section 7.12.

"Removal of LCD Block".

2. Unscrew the 2 screws.

3. Remove the analysis case (upper) while expanding the

hook of it outside.

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

be used for resetting the incidence polarizer position.

3. Unscrew the 1 screw and remove the incidence polarizer

Note:

· Because the hook is damaged easily, be careful not

to expand it excessively.

· The incidence polarizer (G) is installed in the

analysis case (upper). Handle with care not to apply external force to the incidence polarizer (G).

4. Replace the incidence polarizer.

Note:

· Be careful not to touch the surface of incidence

polarizer.

7.17. Replacement of Incidence Polarizer (G)

(G).

4. Attach a new incidence polarizer (G) and align it with the mark.

5. Tighten the 1 screw with care not to move the incidence polarizer position.

7.18. Replacement of Projection

Polarizer

· The procedure is described as an example of projection polarizer (B).

1. Remove the LCD block according to the section 7.12. "Removal of LCD Block".

2. Remove the projection polarizer which requires replacing. (The projection polarizer is secured with adhesive tape.)

Notes:

· Be careful not to damage peripheral components

(prism, LCD panel, etc.).

· Use tweezers.

3. Install new projection polarizer. a. Put adhesive tape on the projection polarizer. b. Stick the projection polarizer on the specified position.

Notes:

· Align the projection polarizer with the guides

(lower, side) of LCD block.

· Be careful not to touch the surface of projection

polarizer.

· Use tweezers.

c. Press the adhesive part and secure the projection

polarizer.

1. Remove the A-P.C.Board block according to the steps 1 through 6 in the section 7.3. "Removal of A-P.C.Board".

2. Mark positions of the incidence polarizer (G).

Note:

· Mark accurately as possible because the marks will

PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA

7.19. Replacement of PBS Array (Analysis Block)

1. Remove the analysis case (upper) according to the steps 1

through 3 in the section 7.16. "Replacement of Incidence Polarizer (R and B)".

2. Remove the PBS array.

3. Install new PBS array.

Note:

· Be careful not to mistake the direction (inside and

outside, upper and lower).

· Be careful not to touch the surface of PBS array.

+ 52 hidden pages