Read Panasonic TC-32LX50 / TC-26LX50 Service Manual online
TC-32LX50
TC-26LX50
TC-26LX50
LH48 Chassis
LCD Television
Specifications
Power Source
AC 120 V, 60 Hz
Power Consumption
Average use : 121 W (TC-26LX50)
Average use : 147 W (TC-32LX50)
Maximum Current : 2.2 A (TC-26LX50)
Maximum Current : 2.6 A (TC-32LX50)
Stand-by condition : 0.1 W
LCD
1366 × 768 pixels widescreen LCD panel
Screen Size
22.7 “ × 12.8 “ × 26 “ (576 mm × 324 mm × 661 mm) (TC-26LX50)
(W × H × diagonal)
27.5 “ × 15.4 “ × 31.5 “ (698 mm × 392 mm × 800 mm) (TC-32LX50)
Channel Capability
VHF-12 : UHF-56 : Cable-125
Sound
Speakers
Ø8 cm × 2 pcs, Ø5 cm × 2 pcs
Audio Output
20 W [10 W + 10 W] (10%THD)
Headphones
M3 (3.5 mm) Jack × 1
FEATURES
3D Y/C Digital Comb Filter, CLOSED CAPTION, V-Chip
Operating Conditions
Temperature : 41 °F - 95 °F (5 °C - 35 °C)
Humidity : 5 % - 90 % RH (non-condensing)
Connection Terminals
INPUT
VIDEO (RCA PIN Type ×1) ×3
1.0 Vp-p (75
W
)
S-VIDEO (MINI DIN 4pin ×1) ×3
Y : 1.0 Vp-p (75
W
),
C : 0.286 Vp-p (75
W
)
AUDIO L-R (RCA PIN Type ×2) ×3
0.5 Vrms
COMPONENT
Y ×2
1.0 Vp-p
VIDEO INPUT
(including synchronization)
P
B
/ P
R
×2
±0.35 Vp-p
AUDIO L-R (RCA PIN Type ×2) ×1
0.5 Vrms
OUTPUT (PROGRAM OUT)
AUDIO L-R (RCA PIN Type 2) ×1
0.5 Vrms, VIDEO (RCA PIN Type ×1) ×1
HDMI
HDMI TYPE A Connector ×1
ORDER NO. ITD0503009CE
B05
Canada:B07
1
Safety Precautions
4
1.1.
General Guidelines
4
2
Warning
4
2.1.
Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
4
2.2.
About lead free solder (PbF)
5
3
Location of Controls and Components
6
4
Service Mode
7
4.1.
How to enter into adjustment mode
7
4.2.
Cancellation
7
4.3.
Contents of adjustment mode
7
5
Troubleshooting Guide
9
5.1.
Self-check function
9
6
Disassembly and Assembly Instructions
10
6.1.
Removing the cable cover
10
6.2.
Removing the pedestal
10
6.3.
Removing the back cover (TC-32LX50)
10
6.4.
Removing the back cover (TC-26LX50)
10
6.5.
Removing the sp box
11
6.6.
Removing the rear AV bracket
11
6.7.
Removing the rear support MTG
11
6.8.
Removing the font bracket and G-Board
12
6.9.
Removing the K-Board and V-Board
12
6.10. Removing the LVDS metal bracket and DV-DG shield 12
6.11. Removing the tuner cover, DV-Board, AP-Board, DG-
Board, and H-Board
13
6.12. Removing the power unit
13
6.13. Removing the chassis
13
6.14. Removing the LCD panel ass
ｴ
y and LCD L/R MTG
13
6.15. Removing the LCD panel and LCD T/B MTG
14
6.16. Lead Wiring (1)
14
6.17. Lead Wiring (2)
14
6.18. Lead Wiring (3)
14
7
Measurements and Adjustments
15
7.1.
Picture level adjustment
15
7.2.
MTS Adjustment
18
8
Block Diagram
21
8.1.
Block Diagram (1 of 4)
21
8.2.
Block Diagram (2 of 4)
22
8.3.
Block Diagram (3 of 4)
23
8.4.
Block Diagram (4 of 4)
24
9
Wiring Connection Diagram
25
10 Schematic Diagrams
27
10.1. Schematic Diagram Notes
27
10.2. AP-Board (1 of 2) Schematic Diagram
28
10.3. AP-Board (2 of 2) Schematic Diagram
29
10.4. H-Board (1 of 3) Schematic Diagram
30
10.5. H-Board (2 of 3) Schematic Diagram
31
10.6. H-Board (3 of 3) Schematic Diagram
32
10.7. DG-Board (1 of 7) Schematic Diagram
33
10.8. DG-Board (2 of 7) Schematic Diagram
34
10.9. DG-Board (3 of 7) Schematic Diagram
35
10.10. DG-Board (4 of 7) Schematic Diagram
36
10.11. DG-Board (5 of 7) Schematic Diagram
37
10.12. DG-Board (6 of 7) Schematic Diagram
38
10.13. DG-Board (7 of 7) Schematic Diagram
39
10.14. DV-Board Schematic Diagram
40
10.15. G, K, and V-Board Schematic Diagram
41
11 Printed Circuit Board
43
11.1. AP-Board
43
11.2. H-Board
45
11.3. DG-Board
48
11.4. G-Board
51
11.5. DV, K, and V-Board
52
12 Exploded View and Replacement Parts List
53
12.1. Parts Layout
53
12.2. Front Chassis Layout
54
12.3. Packing Exploded Views
55
AUDIO L-R (RCA PIN Type ×2) ×1
0.5Vrms
Dimensions ( W × H × D )
Including TV Stand
26.1 “ × 21.9 “ × 11.8 “ (663 mm × 556 mm × 299.5 mm) (TC-26LX50)
31.3 “ × 25 “ ×11.8 “ (795 mm × 634.7 mm × 299.5 mm) (TC-32LX50)
TV Set Only
26.1 “ × 19.5 “ ×5.54 “ (663 mm × 494.3 mm × 140.7 mm) (TC-26LX50)
31.3 “ × 22.6 “ ×5.54 “ (795 mm × 573 mm × 140.7 mm) (TC-32LX50)
Mass (Weight)
18 kg (39.6 lb.) NET (TC-26LX50)
21 kg (46.2 lb.) NET (TC-32LX50)
Note:
Design and Specifications are subject to change without notice. Weight and Dimensions shown are approximate.
CONTENTS
Page
Page
2
TC-32LX50 / TC-26LX50
12.4. Mechanical Replacement Parts List
56
13 Electrical Parts List
57
13.1. Electrical Parts List Notes
57
13.2. Electrical Replacement Parts List
58
3
TC-32LX50 / TC-26LX50
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
1M
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
1M
W
and 5.2M
W
.
When the exposed metal does not have a return path to the
chassis, the reading must be
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 1.5k
W
, 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.
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
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.
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.
2 Warning
2.1. 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).
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.
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).
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.
4
TC-32LX50 / TC-26LX50