TX-23LX60F, TX-23LX60P - Panasonic TV Service Manual (repair manual)

tx-23lx60f, tx-23lx60p service manual
Model
TX-23LX60F TX-23LX60P
Pages
56
Size
5.21 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / GLP21 CHASSIS
File
tx-23lx60f-tx-23lx60p.pdf
Date

Read Panasonic TX-23LX60F / TX-23LX60P Service Manual online

Service Manual
Colour  LCD Television
 
TX-23LX60F
TX-23LX60P
GLP21 Chassis
Specifications
Power Source:
220-240V AC, 50Hz
Power Consumption:
85W
Stand-by Power
Consumption:
0,8W
Aerial Impedance:
75
Ω unbalanced, Coaxial Type
Receiving System:
PAL-I, B/G, D/K,
SECAM B/G, D/K, L/L’
PAL-525/60 (AV only)
M.NTSC (AV only)
NTSC (AV only)
Receiving Channels:
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:
5°C 
÷ 35°C
Humidity:
5% 
÷ 90% RH (non-condensing)
Intermediate Frequency:
Video/Audio
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 (21 pin)
1V p-p 75
Audio (21 pin)
500mV rms 10k
RGB (21 pin)
0,7V p-p 75
S-video IN
Y: 1V p-p 75
(21-pin)
C:0,3V p-p 75
AV2 OUT
Video (21 pin)
1V p-p 75
Audio (21 pin)
500mV rms 1k
AV3 IN
S-Video IN
Y: 1V p-p 75
(4-pin)
C:0,3V p-p 75
Audio (RCAx2)
500mV rms 10k
Video (RCAx1)
1V p-p 75
HDMI1, HDMI2
Type A Connector
COMPONENT YUV
Video (RCAx3)
Y:1V p-p 75
Pb, Pr: 0,7V p-p 75
AUDIO IN
Audio (RCAx2)
500mV rms 10k
LCD screen:
L5EDD5Q00009
1366 x 768 XGA, 16:9
Visible Diagonal 580mm
Audio Output:
2x3W RMS 
8
Ω impedance
Headphones:
3,5mm, 8
Ω Impedance
Accessories 
supplied :
Remote Control
2 x R6 (UM3) Batteries
Dimensions:
Height:
Width:
Depth:
450mm
565mm 
260mm
TV set only
411mm
565mm  
115mm
Net weight:
10kg
Specifications are subject to change without notice.
Weights and dimensions shown are approximate.
ORDER No. PCZ0604025CE
Contents
SAFETY PRECAUTIONS ........................................... 3
GENERAL QUIDE LINES...................................... 3
TOUCH – CURRENT CHECK............................... 3
PREVENTION OF ELECTROSTATIC DISCHARGE
(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)
DEVICES .................................................................... 4
ABOUT LEAD FREE SOLDER (PBF)......................... 5
SUGGESTED PB FREE SOLDER........................ 5
SERVICE HINTS ........................................................ 6
CHASSIS BOARD LAYOUT ....................................... 7
SETTING INSPECTION.............................................. 7
SELF-CHECK ............................................................. 8
ADJUSTMENT METHOD ........................................... 9
BLOCK DIAGRAMS.................................................. 10
PARTS LOCATION................................................... 13
REPLACEMENT PARTS LIST.................................. 14
SCHEMATIC DIAGRAMS......................................... 24
A-BOARD - 3,3V SUPPLY .................................. 25
A-BOARD - 3,3V HDMI SUPPLY ........................ 25
A-BOARD - 5V SUPPLY ..................................... 26
A-BOARD - 33V SUPPLY ................................... 26
A-BOARD - 12V SUPPLY ................................... 27
A-BOARD - 8V SUPPLY ..................................... 27
A-BOARD - STBY 3,3V SUPPLY ........................ 28
A-BOARD - STBY 1,8V SUPPLY ........................ 28
A-BOARD - PSU CONNECTION ........................ 29
A-BOARD - AV1 .................................................. 30
A-BOARD - AV2 .................................................. 30
A-BOARD - AV3 .................................................. 31
A-BOARD - YUV.................................................. 31
A-BOARD - VIDEO SWITCH............................... 32
A-BOARD - QLINK .............................................. 32
A-BOARD - HDMI_CEC ...................................... 33
A-BOARD - LCD PANEL CONNECTOR, PANEL 5V
SUPPLY .............................................................. 33
A-BOARD - TUNER CONNECTION.................... 34
A-BOARD - AUDIO AMPLIFIER.......................... 35
A-BOARD - AUDIO MATRIX ............................... 36
A-BOARD - HDMI AUDIO DAC ........................... 37
A-BOARD - HEADPHONE AMPLIFIER .............. 38
A-BOARD - KEYSCAN........................................ 39
A-BOARD - SERVICE ......................................... 39
A-BOARD - IR LED ............................................. 40
A-BOARD - PROTECTION ................................. 40
A-BOARD - IRD PROTECTION .......................... 41
A-BOARD - LEVEL SHIFTER ............................. 42
A-BOARD - INVERTER ...................................... 43
A-BOARD - EAROM............................................ 43
A-BOARD - BACKLIGHT..................................... 44
A-BOARD - VCT69P ........................................... 45
A-BOARD - HDMI................................................ 46
H-BOARD............................................................ 47
B-BOARD ............................................................ 48
V-BOARD ............................................................ 49
K-BOARD ............................................................ 50
P-BOARD ............................................................ 51
KEY CONTROL................................................... 52
CONDUCTOR VIEWS .............................................. 53
2
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 TKKL5290 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
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.
Fig. 2
Fig. 1
3
TO
APPLIANCES
EXPOSED
METAL PARTS
Resistance values in ohms (
Ω)
V
R
0
=500
R
S
=500
C
S
=500
µF
10k
0.022
µF
U
1
COLD
WATER PIPE
(EARTH GROUND)
V: Voltmetr or oscilloscope
(r.m.s. or peak reading)
Measuring network for TOUCH CURRENTS
Input resistance: 
≥ 1MΩ
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)
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).
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.
IMPORTANT SAFETY NOTICE
4
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