Panasonic PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA Service Manual ▷ View online
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
4
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.
attempted.
·
Unplug the power cord from the power outlet before
disassembling this projector.
disassembling this projector.
·
It is advisable to use an isolation transformer in the AC
power line before the service.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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)
never touch the lamp wire lead during the service. (See Fig.
3)
Fig.3
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
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).
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.
equipment.
·
SELF CHECK
To enter the self-check mode
·
SERVICE MODE
To enter the service mode
6
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.
7
PT-LB20NTU / PT-LB20NTE / PT-LB20NTEA / PT-LB20U / PT-LB20E / PT-LB20EA / PT-LB20SU / PT-LB20SE / PT-LB20SEA / PT-LB20VU / PT-LB20VE / PT-LB20VEA