LMD70 MANUAL.pdf

(14893 KB) Pobierz
ORDER No. PCZ0704033CE
Service Manual
Colour LCD Television
TX-32LXD700
TX-32LXD700F
LH64 Chassis
Specifications
Power Source:
220-240V AC, 50/60Hz
Power Consumption
140W
Stand-by Power Consumption: 0.6W (TV ONLY)
19W (TV+DVB set to record)
Aerial Impedance:
75 Ω unbalanced, Coaxial Type
Receiving System:
LXD700 LXD700F
PAL-I, PAL-I/H, B/G, D/K,
PAL-525/60 (AV only) SECAM B/G, D/K, L/L’
DVB (via UHF aerial input) PAL-525/60 (AV only)
M.NTSC (AV only) DVB (via VHF/UHF aerial input)
NTSC (AV only) M.NTSC (AV only)
NTSC (AV only)
Receiving Channels:
LXD700 LXD700F
UHF E21-E68 VHF E2-E12 VHF H1-H2 (ITALY)
VHF A-H (ITALY) VHF R1-R2
VHF R3-R5 VHF R6-R12
UHF E21-E69 CATV (S01-S05)
CATV S1-S10 (M1-M10) CATV S11-S20 (U1-U10)
CATV S21-S41 (Hyperband)
Operating Conditions:
Temperature: 0°C ÷ 35°C
Humidity: 20% ÷ 80% RH (non condensing)
Scanning format:
480i(60Hz), 480p(60Hz), 576i(50Hz), 576p(50Hz), 720p(60Hz), 720p(50Hz), 1.080i(60Hz),
1.080i(50Hz), 1.080p(60Hz), 1.080p(50Hz)
PC signals:
VGA, SVGA, XGA, SXGA(compressed)
Horizontal scanning frequency
31 – 69 kHz
Vertical scanning frequency
59 – 86 Hz
Panasonic CS ( U.K. ) Ltd.
WILLOUGHBY ROAD,
BRACKNELL,
BERKS.,
RG12 8FT.
753552417.015.png 753552417.016.png
Intermediate Frequency:
LXD700
LXD700F
Video/Audio
Video
38,9MHz
38,9MHz, 33,9MHz
Audio
32.90MHz 33,4MHz (B/G), 33,16MHz (A2)
32.35MHz(NICAM) 33,05MHz (NICAM B/G, D/K, L)
32,4MHz (D/K), 32,66MHz (CZ STEREO)
40,4MHz (L ’ ), 39,75MHz (L ’ NICAM)
Colour
34,47MHz 34,47MHz (PAL)
34,5MHz, 34,65MHz (SECAM)
38,3MHz, 38,15MHz (SECAM L ’ )
Terminals:
AV1 IN
Video (21 pin) 1V p-p 75 Ω
Audio (21 pin) 500mV rms 10k Ω
RGB (21 pin) 0,7V p-p 75 Ω
AV1 OUT
Video (21 pin) 1V p-p 75 Ω
Audio (21 pin) 500mV rms 1k Ω
AV2 IN
Video (21 pin) 1V p-p 75 Ω
Audio (21 pin) 500mV rms 10k Ω
RGB (21 pin) 0,7V p-p 75 Ω
S-video IN (21-pin)Y: 1V p-p 75 Ω
C:0,3V p-p 75 Ω
AV2 OUT
Video (21 pin) 1V p-p 75 Ω
Audio (21 pin) 500mV rms 1k Ω
AV3 IN
S-Video IN (4-pin) Y: 1V p-p 75 Ω
C:0,3V p-p 75 Ω
Audio (RCAx2) 500mV rms 10k Ω
Video (RCAx1) 1V p-p 75 Ω
HDMI1, HDMI2, HDMI3
Type A Connector
COMPONENT
Video (RCAx3) Y:1V p-p 75 Ω (including synchronization)
Pb, Pr: ±0,35V p-p 75 Ω
AUDIO IN
Audio (RCAx2) 500mV rms 10k Ω (for YUV,HDMI1)
AUDIO OUT
Audio (RCAx2) 500mV rms 1k Ω (high impedance)
DIGITAL AUDIO OUT
PCM, Fiber optic
CARD SLOT
SD CARD slot x1
PC
HIGH-DENSITY D_SUB 15PIN R,G,B: 700mV p-p 75 Ω
HD,VD/TTL Level 2-5V p-p (high impedance)
LCD screen:
L5EDD8Q00030
1366 x 768 XGA, 16:9
Visible Diagonal 800mm
Audio Output:
20W (2 x 2.5W, 2 x 7.5W)
Headphones:
3,5mm, 8 Ω Impedance
Accessories supplied :
Remote Control
2 x R6 (UM3) Batteries
Dimensions:
Height: Width: Depth:
Including TV stand
592mm 836mm 248mm
TV set only
540mm 836mm 110mm
Net weight:
18,5kg
Specifications are subject to change without notice.
Weights and dimensions shown are approximate.
Warning
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not
contain warnings or cautions to advise non-technical individuals of potencial dangers in attempting to service a product. Products
powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the
product or products deal within this service information by anyone else could result in serious injury or death.
2
 
753552417.017.png
CONTENTS
GENERAL GUIDE LINES...................................... 4
TOUCH – CURRENT CHECK............................... 4
PREVENTION OF ELECTROSTATIC DISCHARGE
(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)
SUGGESTED PB FREE SOLDER ........................ 6
SETTING INSPECTION.............................................. 9
AP-BOARD (1 OF 2) SCHEMATIC DIAGRAM.... 46
AP-BOARD (2 OF 2) SCHEMATIC DIAGRAM.... 47
G-BOARD SCHEMATIC DIAGRAM .................... 48
H-BOARD (1 OF 4) SCHEMATIC DIAGRAM...... 49
3
Safety Precautions
General Guide Lines
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 touch current checks to prevent the customer from being exposed to shock hazards.
4.
Always ensure panel TKP0E16001 is correctly replaced before returning to customer (see Fig.1).
Fig. 1
Touch-Current Check
1.
Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2.
Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth
ground such as a water pipe, as shown in Fig. 2.
3.
Use Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.
4.
Check each exposed metallic part, and measure the voltage at each point.
5.
Reserve the AC plug in the AC outlet and repeat each of the above measure.
6.
The potential at any point (TOUCH CURRENT) expressed as voltage U1 and U2, does not exceed the following values:
For a. c.: U1 = 35 V (peak) and U2 = 0.35 V (peak);
For d. c.: U1 = 1.0 V,
Note:
The limit value of U2 = 0.35 V (peak) for a. c. and U1 = 1.0 V for d. c. correspond to the values 0.7 mA (peak) a. c. and
2.0 mA d. c.
The limit value U1 = 35 V (peak) for a. c. correspond to the value 70 mA (peak) a. c. for frequencies greater than 100
kHz.
7.
In case a measurement is out 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.
Measuring network for TOUCH CURRENTS
COLD
WATER PIPE
(EARTH GROUND)
R S =1500 Ω
C S =0.22 µ F
10k Ω
TO
APPLIANCES
EXPOSED
METAL PARTS
Resistance values in ohms ( Ω )
V
R 0 =500 Ω
U 1
0.022 µ F
U 2 (V)
V: Voltmetr or oscilloscope
(r.m.s. or peak reading)
Input resistance: ≥ 1M Ω
Input capacitance: ≤ 200pF
Frequency range: 15Hz to 1MHz and d.c.respectively
NOTE – Appropriate measures should be taken to obtain the correct value in case of non-sinusoidal waveforms
Fig. 2
4
753552417.001.png 753552417.002.png 753552417.003.png 753552417.004.png 753552417.005.png 753552417.006.png 753552417.007.png 753552417.008.png 753552417.009.png 753552417.010.png 753552417.011.png 753552417.012.png
Prevention of Electrostatic 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 electrostatic 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
aluminum foil, to prevent electrostatic charge build up 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, aluminum 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 harmless 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).
IMPORTANT SAFETY NOTICE
There are special components used in this equipment which are important for safety.
These parts are marked by in schematic diagrams, exploded views and replacement parts list. It is essential that
these critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire, or other hazards. Do
not modify the original design without permission of manufacturer.
5
753552417.013.png 753552417.014.png

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin