Panasonic PTLB20NTU - PROJECTOR- NETWORK IB User manual

©2005 Matsushita Electric Industrial Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
PT-LB20NTU
PT-LB20NTE
PT-LB20NTEA
PT-LB20U
PT-LB20E
PT-LB20EA
PT-LB20SU
PT-LB20SE
PT-LB20SEA
PT-LB20VU
PT-LB20VE
PT-LB20VEA
LCD Projector
ORDER NO. VED0504362C0
D10

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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 51.1. General Guidelines 5
CONTENTS
Page Page
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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 5
2 Ext Option 6
2.1. Procedure to enter EXT OPTION 6
2.2. EXT OPTION Menu and Functions 6
2.3. Canceling EXT OPTION 7
3 Self-Check Mode 7
3.1. Procedure to enter the self-check mode 7
3.2. Self Check Display and Contents 8
3.3. Canceling the self-check mode 8
4 Service Mode 9
4.1. Procedure to enter the service mode 9
4.2. Canceling the service mode 9
5 Flicker Adjustment Mode 9
5.1. Procedure to enter the adjustment mode 9
5.2. Adjustment Display and Contents 9
5.3. Canceling the flicker adjustment mode 9
6 Using the SERIAL Connector 10
6.1. Connection 10
6.2. Pin Layout and Signal Names for SERIAL Connector 10
6.3. Communication Settings 10
6.4. Basic Format 11
6.5. Control / Query Commands 11
6.6. Communication Cable Specifications 13
6.7. Signal Selector Connecting Cable Specifications 14
7 Disassembly Instructions 15
7.1. Printed Circuit Board and Main Parts Location 15
7.2. Removal of Upper Case 16
7.3. Removal of A-P.C.Board 16
7.4. Removal of WL-P.C.Board (PT-LB20NTU/E/EA only) 17
7.5. Removal of S1-P.C.Board 17
7.6. Removal of S2-P.C.Board 17
7.7. Removal of K-P.C.Board 17
7.8. Removal of B/Q-Module 18
7.9. Removal of P-Module 18
7.10. Removal of Lamp Unit 19
7.11. Removal of Analysis Block and Lens 19
7.12. Removal of LCD Block 20
7.13. Replacement of LCD Panel 20
7.14. LCD Panel Discrimination 21
7.15. LCD Panel Combination 21
7.16. Replacement of Incidence Polarizer (R and B) 21
7.17. Replacement of Incidence Polarizer (G) 22
7.18. Replacement of Projection Polarizer 22
7.19. Replacement of PBS Array (Analysis Block) 23
8 Measurement and Adjustments 24
8.1. Adjustment Procedure Flowchart 24
8.2. Cautions for Adjustment 24
8.3. Setting Before Adjustment 24
8.4. Convergence Adjustment 24
8.5. Lighting Area Adjustment 25
8.6. Software for Adjustment 27
8.7. Flicker Adjustment 28
8.8. Input Level Adjustment 28
8.9. Model Information Setup 29
9 Troubleshooting 30
10 Interconnection Block Diagram 41
10.1. Interconnection Block Diagram (1/2) 41
10.2. Interconnection Block Diagram (2/2) 42
11 Block Diagram 43
11.1. Power Supply 43
11.2. Signal Processing (1/3) 44
11.3. Signal Processing (2/3) 45
11.4. Signal Processing (3/3) 46
12 Schematic Diagram 47
12.1. A-P.C.Board (1/4) 48
12.2. A-P.C.Board (2/4) 49
12.3. A-P.C.Board (3/4) 50
12.4. A-P.C.Board (4/4) 51
12.5. WL-P.C.Board (1/2) 52
12.6. WL-P.C.Board (2/2) 53
12.7. B-Module (1/2) 54
12.8. B-Module (2/2) 55
12.9. K-P.C.Board 56
12.10. S1-P.C.Board, S2-P.C.Board 57
13 Circuit Boards 59
13.1. A-P.C.Board (Foil Side) / WL-P.C.Board (Foil
Side/Component Side) 59
13.2. A-P.C.Board (Component) / S1-P.C.Board (Foil
Side/Component Side) 60
14 Terminal guide of ICs and transistors 61
15 Exploded Views 62
16 Replacement Parts List 65
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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.
Fig. 1
Table 1
Fig. 2
2.Assemble the circuit as shown in Fig. 2. Plug the power
cord in a power outlet.
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 direct-
eye 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.
3)
Fig.3
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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
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· 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.
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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.
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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 " " or down-arrow " " button allows the test pattern selection and the
left-arrow " " or right-arrow " " button the color selection (White / Red / Green / Blue).
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 " " and down-arrow " " buttons.
"": 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.
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.
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Pin No Signal Name Contents
3RXD Receive data
4GND Ground
5TXD Transmit data
1---
2--- Connected internally
6---
7--- NC
8--- NC
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
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
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Control Commands
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
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Query Commands
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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
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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".
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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
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7.2. Removal of Upper Case
1.Turn the projector upside down.
2.Unscrew the 6 screws.
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).
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.
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 S2-
P.C.Boards, remove the S2-P.C.Board block.
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7.4. Removal of WL-P.C.Board (PT-
LB20NTU/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.
7.5. 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.
3.Unscrew the 2 screws and remove the S1-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.
7.7. 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).
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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 attachmemt fittings.
7.Unscrew the 2 screws and remove the K-P.C.Board.
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
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 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.
7.9. 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
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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.
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.
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.
7.11. 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.
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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).
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.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.
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