Panasonic TX-32LXD85F User manual

Service Manual
Colour LCD Television
TX-32LXD85F
TX-37LXD85F
TX-32LXD85
TX-37LXD85
GLP23 Chassis
Specifications
(Informations in brackets [ ] refers to model 32”)
Power Source: 220-240V AC, 50Hz
Power Consumption 180W [140W]
Stand-by Power Consumption: 0.4W (Without monitor out recording)
14,5W [13W] (With monitor out recording)
Aerial Impedance: 75Ωunbalanced, Coaxial Type
Receiving System: LXD85 LXD85F
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: LXD85 LXD85F
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) ), 1.080p(24Hz)
PC signals: VGA, SVGA, XGA, SXGA(compressed)
Horizontal scanning frequency 31 – 69 kHz
Vertical scanning frequency 59 – 86 Hz
ORDER No. PCZ0804034CE
Panasonic CS ( U.K. ) Ltd.
WILLOUGHBY ROAD,
BRACKNELL,
BERKS.,
RG12 8FT.
All manuals and user guides at all-guides.com

Intermediate Frequency:
Video/Audio LXD85 LXD85F
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 75Ω
Audio (21 pin) 500mV rms 10kΩ
RGB (21 pin) 0,7V p-p 75Ω
AV1 OUT Video (21 pin) 1V p-p 75Ω
Audio (21 pin) 500mV rms 1kΩ
AV2 IN Video (21 pin) 1V p-p 75Ω
Audio (21 pin) 500mV rms 10kΩ
RGB (21 pin) 0,7V p-p 75Ω
S-video IN (21-pin)Y: 1V p-p 75Ω
C:0,3V p-p 75Ω
AV2 OUT Video (21 pin) 1V p-p 75Ω
Audio (21 pin) 500mV rms 1kΩ
AV3 IN S-Video IN (4-pin) Y: 1V p-p 75Ω
C:0,286V p-p 75Ω
Audio (RCAx2) 500mV rms 10kΩ
Video (RCAx1) 1V p-p 75Ω
HDMI1, HDMI2, HDMI3 Type A Connector
COMPONENT Video (RCAx3) Y:1V p-p 75Ω(including synchronization)
Pb, Pr: ±0,35V p-p 75Ω
AUDIO IN Audio (RCAx2) 500mV rms 10kΩ(for YUV; HDMI1)
AUDIO OUT Audio (RCAx2) 500mV rms 1kΩ(high Impedance)
CARD SLOT SD CARD slot ×1
PC HIGH-DENSITY D_SUB 15PIN R,G,B: 700mV p-p 75Ω
HD,VD:TTL Level 2-5V p-p (high impedance)
LCD screen: L5EDD9Q00004 [L5EDD8Q00040]
1366 x 768 XGA, 16:9
Visible Diagonal 940mm [800mm]
Audio Output: 20W (2x10W)
Headphones: 3,5mm (M3), 8ΩImpedance
Accessories supplied : Remote Control 2 x R6 (UM3) Batteries
Dimensions:
Height: Width: Depth:
Including TV stand 645mm 940mm 294mm
[572mm] [820mm] [250mm]
TV set only 605mm 940mm 120mm
[534mm] [820mm] [119mm]
Net weight:
Including TV stand 21.0kg [17.0kg]
TV set only 17,5kg [14kg]
Specifications are subject to change without notice.
Weights 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.
Warning
2
All manuals and user guides at all-guides.com

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
SETTING INSPECTION........................................................................... 10
SELF-CHECK .......................................................................................... 11
POWER LED BLINKING TIMING CHART ............................................... 12
SERVICE MODE FUNCTION .................................................................. 13
SERVICE ................................................................................................ 14
OPTION DESCRIPTION.......................................................................... 15
ADJUSTMENT METHOD ........................................................................ 16
WIRING DIAGRAM.................................................................................. 17
BLOCK DIAGRAMS................................................................................. 18
PARTS LOCATION.................................................................................. 21
REPLACEMENT PARTS LIST................................................................. 23
SCHEMATIC DIAGRAMS........................................................................ 43
A-BOARD (1 OF 18) SCHEMATIC DIAGRAM ................................... 44
P-BOARD SCHEMATIC DIAGRAM ................................................... 62
G-BOARD SCHEMATIC DIAGRAM................................................... 63
V-BOARD SCHEMATIC DIAGRAM ................................................... 64
K-BOARD SCHEMATIC DIAGRAM ................................................... 65
CONDUCTOR VIEWS ............................................................................. 66
3
All manuals and user guides at all-guides.com

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).
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
4
TO
A
PPLIANCES
EXPOSED
METAL PARTS
Resistance values in ohms (Ω)
V
R0=500
Ω
RS=1500
Ω
CS=0.22
μ
F
10k
Ω
0.022
μ
F
U1
COLD
WATER PIPE
(EARTH GROUND)
V: Voltmetr or oscilloscope
(r.m.s. or peak reading)
Measuring network for TOUCH CURRENTS
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
U2(V)
Fig. 1
All manuals and user guides at all-guides.com

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
5
All manuals and user guides at all-guides.com