Panasonic TX-17LA1M User manual

Power Source
AC 100~240V, 50/60Hz
Power Consumption
Average use: 56W (17inch model)
60W (20inch model)
Stand-by condition: 1.8W
TV set DC 15V, 3.2 A max. (17inch model)
TV set DC 15V, 3.4 A max. (20inch model)
LCD
17inch (432mm) (17inch model)
20inch (510mm) (20inch model)
4:3 aspect ratio LCD panel (640 × 480 pixel)
Screen Size
343.7mm(W) x 261.6mm(H) (17inch model)
408.0mm(W) x 306.0mm(H) (20inch model)
Sound
Speaker
Ø4cm, 2pcs, 169
Audio Output
6.0W (3.0W+3.0W), 10%THD
Headphones
M3(3.5 mm) Jack x 1
©2003 Matsushita Electric Industrial Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
TX-17LA1M
TX-17LA1Q
TX-17LA1Z
TX-17LA1X
TX-17LA1T
TC-17LA1H
TX-20LA1M
TX-20LA1Q
TX-20LA1Z
TX-20LA1X
TX-20LA1T
TC-20LA1H
LH11 Chassis
Receiving Systems/ Band name
Receiving Channels
Regular TV
VHF-BAND
2-12 (PAL/SECAM B, K1)
0-12 (PAL B AUST.)
1-9 (PAL B N. Z)
1-12 (PAL/SECAM D)
1-12 (NTSC M Japan)
LCD TV
ORDER NO. ITD0311071C3

2-13 (NTSC M U.S.A)
UHF BAND
21-69 (PAL G, H, I/SECAM G, K, K1)
28-69 (PAL B AUST.)
13-57 (PAL D, K)
13-62 (NTSC M Japan)
14-69 (NTSC M U.S.A)
CATV
S1-S20 (OSCAR)
1-125 (U.S.A CATV)
C13-C49 (JAPAN)
S21-S41 (HYPER)
Z1-Z37 (CHINA)
5A, 9A (AUST.)
Aerial-Rear
UHF/VHF
Operating Conditions
Temperature: 5°C-40°C
Humidity: 5%-90% RH (non-condensing)
Connection terminals
AV1
VIDEO (RCA Pin Type)
1.0Vp-p (75 9)
S-VIDEO (MINI DIN 4-pin)
y:1.0Vp-p (75 9) C:0.286 Vp-p (75 9)
AUDIO L-R (RCA Pin Type × 2)
0.5 Vrms
AV2
VIDEO (RCA Pin Type)
1 Safety Precautions 4
1.1. General Guidelines 4
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 5
3 About lead free solder (PbF) 6
4SelfCheck 7
5 SERVICE HINTS 7
5.1. Hotel Mode 7
6 Chassis Board Layout 8
7 Before servicing 9
7.1. Kind and location of the flexible cable 9
7.2. How to remove the connector 10
8 Disassembly for Service 11
8.1. Hinge cover and AV cable cover 11
8.2. Rear cover and Tilt base 11
8.3. AV terminal cover, EP jack cover, and Tuner cover 12
1.0 Vp-p (75 9)
A
UDIO L-R (RCA Pin Type × 2)
0.5Vrms
Y
1.0 Vp-p (including ynchronization)
PB/PR
±0.35Vp-p
V
IDEO (RCA PinType)
1.0 Vp-p (75 9)
A
UDIO L-R (RCA Pin Type × 2)
0.5 Vrms
MONITOR OUT
V
IDEO (RCA Pin Type)
1.0Vp-p (759)
A
UDIO L-R (RCA Pin Type×2)
0.5Vrms
Dimensions (W x D x H)
Including TV Stand
424mm x 415mm x 215mm (17inch model)
494mm x 461mm x 255mm (20inch model)
TV Set Only
424mm x 382mm x 64mm (17inch model)
494mm x 422mm x 82mm (20inch model)
Weight (Mass)
5.4kg Net (17inch model)
7.4kg Net (20inch model)
Note:
Design and Specifications are subject to change without notice.
Weight and Dimensions shown are approximate.
8.4. Shield plate 12
8.5. Inverter shield and Lock hinge (20inch model) 13
8.6. B-Board and K-Board 14
8.7. BL-Board, DG-Board and A-Board 14
8.8. V-Board 15
8.9. Speaker 15
8.10. LCD panel 16
9 Service Mode Function 17
9.1. How to enter SERVICE 1 17
9.2. How to enter SERVICE 2 17
9.3. Option Description 19
9.4. Option Code Setting (17 inch model) 21
9.5. Option Code Setting (20 inch model) 22
10 Conductor Views 23
10.1. A-Board 23
10.2. DG-Board (17inch model) 25
CONTENTS Page Page
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10.3. DG-Board (20inch model) 30
10.4. B, BL, K and V-Board 34
11 Block and Schematic Diagram 37
11.1. Schematic Diagram Notes 37
11.2. Power Block Diagram 38
11.3. Signal Block Diagram 40
11.4. A-Board (1 of 4) and B-Board Schematic Diagram 42
11.5. A-Board (2 of 4) Schematic Diagram 43
11.6. A-Board (3 of 4) and V-Board Schematic Diagram 44
11.7. A-Board (4 of 4) Schematic Diagram, BL-Board, and K-
Board Schematic Diagram 45
11.8. DG-Board (1 of 6) Schematic Diagram (For 17inch model)
46
11.9. DG-Board (2 of 6) Schematic Diagram (For 17inch model)
47
11.10. DG-Board (3 of 6) Schematic Diagram (For 17inch model)
48
11.11. DG-Board (4 of 6) Schematic Diagram (For 17inch model)
49
11.12. DG-Board (5 of 6) Schematic Diagram (For 17inch model)
50
11.13. DG-Board (6 of 6) Schematic Diagram (For 17inch model)
51
11.14. DG-Board (1 of 5) Schematic Diagram (For 20inch model)
52
11.15. DG-Board (2 of 5) Schematic Diagram (For 20inch model)
53
11.16. DG-Board (3 of 5) Schematic Diagram (For 20inch model)
54
11.17. DG-Board (4 of 5) Schematic Diagram (For 20inch model)
55
11.18. DG-Board (5 of 5) Schematic Diagram (For TX-20LA1) 56
12 Parts Location & Mechanical Replacement Parts List 57
12.1. Parts Location (1) 57
12.2. Parts Location (2) 58
12.3. Parts Location (3) 59
12.4. Mechanical Replacement Parts List 60
13 Replacement Parts List 61
13.1. Replacement Parts List Notes 61
13.2. Electrical Replacement Parts List 62
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TX-17LA1M

1.1.1. Leakage Current Cold Check
1.Unplug the AC cord and connect a jumper between the two
prongs on the plug.
2.Measure the resistance value, with an ohmmeter, between
the jumpered AC plug and each exposed metallic cabinet
part on the equipment such as screwheads, connectors,
control shafts, etc. When the exposed metallic part has a
return path to the chassis, the reading should be between
1M9and 5.2M9.
When the exposed metal does not have a return path to
the chassis, the reading must be .
Figure 1
1.1.2. Leakage Current Hot Check (See
Figure 1.)
1.Plug the AC cord directly into the AC outlet. Do not use an
isolation transformer for this check.
2.Connect a 1.5k9, 10 watts resistor, in parallel with a 0.15µF
capacitors, between each exposed metallic part on the set
and a good earth ground such as a water pipe, as shown in
Figure 1.
3.Use an AC voltmeter, with 1000 ohms/volt or more
sensitivity, to measure the potential across the resistor.
4.Check each exposed metallic part, and measure the
voltage at each point.
5.Reverse the AC plug in the AC outlet and repeat each of the
above measurements.
6.The potential at any point should not exceed 0.75 volts
RMS. A leakage current tester (Simpson Model 229 or
equivalent) may be used to make the hot checks, leakage
current must not exceed 1/2 milliamp. In case a
measurement is outside of the limits specified, there is a
possibility of a shock hazard, and the equipment should be
repaired and rechecked before it is returned to the
customer.
1 Safety Precautions
1.1. General Guidelines
1.When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2.After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3.After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
4
TX-17LA1M

2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage
caused by electro static discharge (ESD).
1.Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2.After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as alminum
foil, to prevent electrostatic charge buildup or exposure of the assembly.
3.Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4.Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can
generate electrical charge sufficient to damage ES devices.
5.Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6.Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, alminum foil or comparable
conductive material).
7.Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8.Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise hamless motion such as the brushing
together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to
damage an ES device).
5
TX-17LA1M

3 About lead free solder (PbF)
Note: Lead is listed as (Pb) in the periodic table of elements.
In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder.
The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu).
That is Tin (Sn), Silver (Ag) and Copper (Cu) although other types are available.
This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For service and repair work, we’d
suggest the use of Pb free solder as well, although Pb solder may be used.
PCBs manufactured using lead free solder will have the PbF within a leaf Symbol stamped on the back of PCB.
Caution


·

Pb free solder has a higher melting point than standard solder. Typically the melting point is 50 ~ 70 °F (30~40°C) higher.
Please use a high temperature soldering iron and set it to 700 ± 20 °F (370 ± 10 °C).


·

Pb free solder will tend to splash when heated too high (about 1100 °F or 600 °C).
If you must use Pb solder, please completely remove all of the Pb free solder on the pins or solder area before applying Pb
solder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder.


·

After applying PbF solder to double layered boards, please check the component side for excess solder which may flow onto
the opposite side. (see figure below)
Suggested Pb free solder
There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu (tin, silver, copper) solder.
However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder can also be used.
6
TX-17LA1M

4SelfCheck
1.Self-Check is used to automatically check the bus lines and hexadecimal code of the TV set.
2.To get into the Self -Check mode press the [Down ( )] button on the customer controls at the front of the set, at the same
time pressing the [SET UP] button on the remote control, and the screen will show :
If the CCU ports have been checked and found to be incorrect or not located then “--” will appear in place of “O.K.”.
5 SERVICE HINTS
5.1. Hotel Mode
Purpose
1.At Hotels, this Mode prevent customer from changing the TV preset data, such as Channel preset data.
Note:
This Mode is useful for hotel, you should not get into “Hotel Mode” with Normal use.
Operation
1.To get into “ Hotel Mode”, press “Recall” button on the remote control and Channel up “[ ]” key on the TV set
simultaneously, after setting the “Off-Timer” mode.
2.In this mode, The Channel up and down Function will be able as normal Mode, and The maximum volume level for this
mode is set at the current volume level, that means setting at the level before entering the mode. However, other function
will be disable.
3.To exit This mode, press “SET UP” button on the remote control and the “Volume Down [ ]” key on the TV set
simultaneously.
* This Information is informed by Service Manual only.
7
TX-17LA1M

Board Name Function
A-Board Audio, Power, Inverter, AV SW
B-Board Tuner
BL-Board Inverter
DG-Board GC2, PCN, MICOM, EEPROM
K-Board Switch
V-Board Remote sensor, LED
6 Chassis Board Layout
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TX-17LA1M

<17inch model> <20inch model>
7 Before servicing
7.1. Kind and location of the flexible cable
Ref No. Flexible cable Connector type Pins Location Opposite Ref No.
A6 ltype1 50 pin A-BOARD DG9001
A1 - - 15 pin A-BOARD B1
A2 - - 9pin A-BOARD B2
A7 - - 2pin A-BOARD Back Light (U)
A8 - - 2pin A-BOARD Back Light (U)
A3 - - 4pin A-BOARD K1
A5 ltype2 13 pin A-BOARD V1
A4 - - 11 pin A-BOARD BL1
B1 - - 15 pin B-BOARD A1
B2 - - 9pin B-BOARD A2
BL1 - - 11 pin BL-BOARD A4
BL4 - - 2pin BL-BOARD Back Light (D)
BL6 - - 2pin BL-BOARD Back Light (D)
DG9001 ltype3 50 pin DG-BOARD A6
DG6800 ltype3 50 pin DG-BOARD (20inch model only) LCD Panel
DG6501 ltype4 40 pin DG-BOARD (17inch model only) LCD Panel
DG6502 ltype4 40 pin DG-BOARD (17inch model only) LCD Panel
K1 - - 4pin K-BOARD A3
V2 - - 2pin V-BOARD Speaker (R)
V3 - - 2pin V-BOARD Speaker (L)
V1 ltype3 13 pin V-BOARD A5
9
TX-17LA1M

Connector type1
Connector type2
Connector type3
Connector type4
7.2. How to remove the connector
10
TX-17LA1M

8.1. Hinge cover and AV cable
cover
1.Thick cloth and so on is down to damage a LCD screen,
and the unit is pushed down.
2.Remove the AV cable cover.
3.Remove the screw (1pcs), and detach the hinge cover.
<17inch model>
<20inch model>
8.2. Rear cover and Tilt base
1.Remove the screws (7pcs) (17inch model)/(9pcs) (20inch
model), and detach the rear cover.
2.Remove the screws (4pcs), and detach the tilt base.
3.Remove the screws (2pcs).
<17inch model>
<20inch model>
Caution:
PCB Fixing screws driving torque: 0.2-0.3N m(2-3kg
mm)
Do not tighten screws so hard.
8 Disassembly for Service
11
TX-17LA1M

8.3. AV terminal cover, EP jack
cover, and Tuner cover
1.Remove the AV terminal cover.
2.Remove the EP jack cover.
3.Remove the tuner cover.
4.Remove the screws (4pcs) (17inch moel)/(2pcs) (20inch
model).
5.Remove the screws (3pcs)(17inch model), and detach the
inverter shield (17inch model).
<17inch model>
<20inch model>
8.4. Shield plate
1.Remove the screws (5pcs) (17inch model)/(6pcs) (20inch
model), and detach the shield plate.
2.Disengage the shaft holder hook and detach the power
button shaft.
3.Disconnect the coupler (A3).
<17inch model>
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TX-17LA1M

<20inch model>
Caution:
PCB Fixing screws driving torque: 0.2-0.3N m (2-3kg
mm)
Do not tighten screws so hard.
8.5. Inverter shield and Lock hinge
(20inch model)
1.Remove the screws (6pcs) and the screw (1pcs), and
detach the lock hinge and the inverter shield.
2.Disengage the shaft holder hook and detach the power
button shaft.
3.Disconnect the coupler (A3).
<20inch model>
Caution:
PCB Fixing screws driving torque: 0.2-0.3N m(2-3kg
mm)
Do not tighten screws so hard.
13
TX-17LA1M

8.6. B-Board and K-Board
1.Remove the K-Board
2.Remove the screw (1pcs), and detach the B-Board.
<17inch model>
<20inch model>
Caution:
PCB Fixing screws driving torque: 0.2-0.3N m (2-3kg
mm)
Do not tighten screws so hard.
8.7. BL-Board, DG-Board and A-
Board
1.Remove the screw (1pcs) (17inch model)/(2pcs) (20inch
model), and detach the BL-Board.
2.Remove the screws (3pcs) (17inch model)/(5pcs) (20inch
model), and detach the DG-Board.
3.Remove the screws (3pcs), and detach the A-Board.
<17inch model>
<20inch model>
Caution:
PCB Fixing screws driving torque: 0.2-0.3N m(2-3kg
mm)
Do not tighten screws so hard.
14
TX-17LA1M

8.8. V-Board
1.Remove the screw (1pcs), and detach the V-Board.
<17inch model>
<20inch model>
8.9. Speaker
1.Remove the screws (3pcs), and detach the speaker (L).
2.Remove the screws (3pcs), and detach the speaker (R).
<17inch model>
<20inch model>
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8.10. LCD panel
1.Remove the screws (2pcs), and detach the LCD panel.
<17inch model>
<20inch model>
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9 Service Mode Function
MPU controls the functions switching for each IICs through IIC bus in this chassis. The following setting and adjustment can be
adjusted by remote control in Service Mode.
9.1. How to enter SERVICE 1
1.In sound menu, set BASS to MAXIMUM, and set TREBLE to MINIMUM.
2.Simultaneously press INDEX button on remote control and DOWN button [ ]ontheTVset.
9.2. How to enter SERVICE 2
1.Set the channel to CH99.
2.Press HOLD button on remote control.
Note:
To exit to Service mode, press N or Power button on remote control.
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18
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9.3. Option Description
19
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