Panasonic TX-LR24C3 Service Manual ▷ View online
Service Manual
LCD Television
TX-LR24C3
GLP26 Chassis
Specifications
Power
Source:
220-240V AC, 50 Hz
Rated Power Consumption:
72W
Stand-by Power Consumption:
0.3W (Without monitor out recording)
6.7W (With monitor out recording)
Aerial
Impedance:
75
unbalanced, Coaxial Type
Receiving System:
DVB-T Digital terrestrial services (MPEG2 and MPEG4-AVC
(H.264)
)
DVB-C
Digital cable services (MPEG2 and MPEG4-AVC
(H.264)
PAL-D/K,
SECAM
D/K
PAL-525/60 (AV only)
M.NTSC
(AV
only)
NTSC (AV only)
Receiving Chanels:
VHF R1-R2
VHF R6-R12
VHF
R3-R5
UHF
E21-E69
Aerial - Rear:
VHF/UHF
Operating Conditions:
Temperature: 0°C
35°C
Humidity:
20%
80% RH (non condensing)
and
ORDER No. ITD1106018CE
Intermediate Frequency:
Video/Audio
Video
Video
38.9MHz,
33.9MHz
Audio
33.4MHz (B/G), 33.16MHz (A2)
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
(PAL)
34.5MHz, 34.65MHz (SECAM)
38.3MHz, 38.15MHz (SECAM L
’
)
Terminals:
AV1 IN
Video (21 pin)
1V p-p 75
Audio (21 pin)
500mV rms 10k
RGB (21 pin)
0.7V p-p 75
AV1 OUT
Video (21 pin)
1V p-p 75
Audio (21 pin)
500mV rms 1k
AV2 IN
Video (RCAx1)
1V p-p 75
AUDIO IN
Audio (RCAx2)
500mV rms 10k
(used for HDMI1,HDMI2_ AUDIO IN)
COMPONENT
Video (RCAx3)
Y:1V p-p 75
(including synchronization)
Pb, Pr: ±0.35V p-p 75
HDMI1, HDMI2
Type A Connectors
HDMI 2: HDMI (Version 1.4 with Audio Return Channel)
This TV supports “HDAVI Control 5” function.
DIGITAL AUDIO OUT
PCM / Dolby digital / DTS, Fiber optic
CARD SLOT
SD CARD slot x1
Common interface slot x1
LCD screen:
L5EDDYY00206
1366 x 768, 16:9
Visible Diagonal 610mm
Audio
Output:
10W (2 x 5W), 10% THD
Headphones:
3.5mm,
8
Impedance
Accessories supplied :
Remote Control
2 x R6 (UM3) Batteries
Dimensions:
Height: Width: Depth:
Including TV stand
437mm 620mm 187mm
TV set only
404mm 620mm 99mm
Mass:
Including TV stand
6.5kg
TV set only
6.0kg
Specifications are subject to change without notice.
Mass and dimensions shown are approximate.
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.
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.
Warning
2
CONTENTS
SAFETY PRECAUTIONS ........................................... 4
GENERAL
GUIDE LINES...................................... 4
TOUCH – CURRENT CHECK............................... 4
PREVENTION OF ELECTROSTATIC DISCHARGE
(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)
DEVICES .................................................................... 5
ABOUT LEAD FREE SOLDER (PBF)......................... 6
SUGGESTED
PB
FREE SOLDER........................ 6
APPLICABLE SIGNALS.............................................. 7
SERVICE HINTS ........................................................ 8
CHASSIS BOARD LAYOUT ....................................... 9
LOCATION OF LEAD WIRING ................................... 9
TECHNICAL DESCRIPTION ................................….10
SPECIFICATION OF KEY FOR CI PLUS,
DTCP-IP,
ONE-TO-ONE ..................................... 10
GENERAL
INFORMATION ................................. 10
REPLACEMENT
OF ICS..................................... 10
MODEL
AND KEYS ............................................ 10
SETTING INSPECTION............................................ 11
SELF CHECK ........................................................... 12
HOTEL MODE .......................................................... 17
DATA COPY BY SD CARD....................................... 18
DATA COPY FROM TV SET TO SD CARD ............. 19
DATA COPY FROM SD CARD TO TV SET ............. 20
OPTION BYTES DESCRIPTION .............................. 21
ADJUSTMENT METHOD.......................................... 22
WIRING DIAGRAM ................................................... 23
BLOCK DIAGRAM (1 OF 2) ...................................... 24
PARTS LOCATION................................................... 26
REPLACEMENT PARTS LIST NOTE....................... 28
REPLACEMENT PARTS LIST.................................. 29
SCHEMATIC DIAGRAMS ......................................... 38
A-BOARD (1 OF 16) SCHEMATIC DIAGRAM .... 39
P-BOARD (1 OF 2) SCHEMATIC DIAGRAM ...... 55
KA-BOARD
SCHEMATIC DIAGRAM .................. 57
K-BOARD
SCHEMATIC DIAGRAM .................... 57
CONDUCTOR VIEWS .............................................. 58
POWER LED BLINKING TIMING CHART ................ 13
SERVICE MODE FUNCTION ................................... 14
SERVICE ................................................................ 15
SERVICE TOOL MODE............................................ 16
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 connector cover TKP0E49301 is correctly replaced before returning to customer (see Fig.1).
4. Always ensure connector cover TKP0E49301 is correctly replaced before returning to customer (see 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
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:
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,
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.
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.
Fig. 2
TO
APPLIANCES
EXPOSED
METAL PARTS
APPLIANCES
EXPOSED
METAL PARTS
Resistance values in ohms (
)
V
R
0
=500
R
S
=1500
C
S
=0.22
F
10k
0.022
F
COLD
WATER PIPE
(EARTH GROUND)
WATER PIPE
(EARTH GROUND)
V: Voltmetr or oscilloscope
(r.m.s. or peak reading)
(r.m.s. or peak reading)
Measuring network for TOUCH CURRENTS
Input resistance:
1M
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
U
2
(V)
U
1
(V)
Fig. 1
4
