TX-32LX70F, TX-32LX70L, TX-32LX70P, TX-26LX70F, TX-26LX70L, TX-26LX70P - Panasonic TV Service Manual (repair manual)

tx-32lx70f, tx-32lx70l, tx-32lx70p, tx-26lx70f, tx-26lx70l, tx-26lx70p service manual
Model
TX-32LX70F TX-32LX70L TX-32LX70P TX-26LX70F TX-26LX70L TX-26LX70P
Pages
74
Size
11.71 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LH64 CHASSIS
File
tx-32lx70f-tx-32lx70l-tx-32lx70p-tx-26lx70f-tx-26l.pdf
Date

Read Panasonic TX-32LX70F / TX-32LX70L / TX-32LX70P / TX-26LX70F / TX-26LX70L / TX-26LX70P Service Manual online

Service Manual
Colour LCD Television 
 
TX-32LX70F 
TX-32LX70L 
TX-32LX70P 
TX-26LX70F 
TX-26LX70L 
TX-26LX70P 
 
LH64 Chassis 
 
 
Specifications
   (Informations in brackets [ ] refers to model 26”) 
 
 Power 
Source: 
220-240V AC, 50/60Hz 
 
Power Consumption 
 
134W [100W] 
 
 
Stand-by Power Consumption:  0.4W  
 Aerial 
Impedance: 75
Ω unbalanced, Coaxial Type 
 
 
Receiving System: 
LX70L                                    LX70F, LX70P 
 
 
 
PAL-I,                                        PAL-I/H, B/G, D/K, 
 
 
PAL-525/60 (AV only)                  SECAM B/G, D/K, L/L’ 
 
 
M.NTSC (AV only)                      PAL-525/60 (AV only) 
 
 
NTSC (AV only)                        M.NTSC (AV only) 
 
 
                                            NTSC (AV only) 
 
 
Receiving Channels: 
LX70L                                    LX70F, LX70P 
 
 
 
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 
 
 
 
 
 
 
 
 
 
 
ORDER No. PCZ0702011CE 
ISSUE 2 
 
Intermediate Frequency
Video/Audio    
 
 
LX70L 
 
      LX70F, LX70P 
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 
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) 
 
 
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 
            [L5EDD6Q00024] 
 
 
 
 
 
1366 x 768 XGA, 16:9 
 
 
 
 
 
Visible Diagonal 800mm         [660mm] 
 
  Audio 
Output: 
   
20W (2x10W) 
 
 Headphones: 
   
3,5mm, 
8
Ω Impedance 
 
 
Accessories supplied : 
 
Remote Control 
 
2 x R6 (UM3) Batteries 
 
 Dimensions: 
 
 
Height:      Width:       Depth:  
 
 
Including TV stand 
615mm      791mm     248mm 
 
 
 
[525mm]    [657mm]    [216mm] 
 
 
TV set only 
563mm      791mm      117mm 
 
 
[473mm]    [657mm]    [117mm] 
 
 Net 
weight: 
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 
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 
SETTING INSPECTION.............................................. 9
 
SELF-CHECK ........................................................... 10 
POWER LED BLINKING TIMING CHART ................ 12 
SERVICE MODE FUNCTION ................................... 13 
SERVICE ................................................................. 14 
OPTION BYTES DESCRIPTION .............................. 15 
ADJUSTMENT METHOD ......................................... 16 
WIRING DIAGRAM ................................................... 17 
BLOCK DIAGRAMS.................................................. 18 
PARTS LOCATION................................................... 21 
REPLACEMENT PARTS LIST.................................. 22 
SCHEMATIC DIAGRAMS......................................... 43 
 
AP-BOARD (1 OF 2) SCHEMATIC DIAGRAM.... 44 
 
AP-BOARD (2 OF 2) SCHEMATIC DIAGRAM.... 45 
 G-BOARD 
SCHEMATIC DIAGRAM .................... 46 
 K-BOARD 
SCHEMATIC DIAGRAM .................... 47 
 
H-BOARD (1 OF 4) SCHEMATIC DIAGRAM ...... 48 
 
H-BOARD (2 OF 4) SCHEMATIC DIAGRAM ...... 49 
 
H-BOARD (3 OF 4) SCHEMATIC DIAGRAM ...... 50 
 
H-BOARD (4 OF 4) SCHEMATIC DIAGRAM ...... 51 
 P-BOARD 
SCHEMATIC DIAGRAM .................... 52 
 V-BOARD 
SCHEMATIC DIAGRAM .................... 53 
 
DG-BOARD (1 OF 14) SCHEM. DIAGRAM ........ 54 
 
DG-BOARD (2 OF 14) SCHEM. DIAGRAM ........ 55 
 
DG-BOARD (3 OF 14) SCHEM. DIAGRAM ........ 56 
 
DG-BOARD (4 OF 14) SCHEM. DIAGRAM ........ 57 
 
DG-BOARD (5 OF 14) SCHEM. DIAGRAM ........ 58 
 
DG-BOARD (6 OF 14) SCHEM. DIAGRAM ........ 59 
 
DG-BOARD (7 OF 14) SCHEM. DIAGRAM ........ 60 
 
DG-BOARD (8 OF 14) SCHEM. DIAGRAM ........ 61 
      DG-BOARD (9 OF 14) SCHEM. DIAGRAM ........ 62 
 
DG-BOARD (10 OF 14) SCHEM. DIAGRAM ...... 63 
 
DG-BOARD (11 OF 14) SCHEM. DIAGRAM ...... 64 
 
DG-BOARD (12 OF 14) SCHEM. DIAGRAM ...... 65 
 
DG-BOARD (13 OF 14) SCHEM. DIAGRAM ...... 66 
 
DG-BOARD (14 OF 14) SCHEM. DIAGRAM ...... 67 
CONDUCTOR VIEWS .............................................. 68  
 
 
 
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 
Fig. 1 
TO 
APPLIANCES 
EXPOSED 
METAL PARTS 
Resistance values in ohms (
Ω) 
R
0
=500
Ω 
R
S
=1500
Ω 
C
S
=0.22
µF 
10k
Ω 
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) 
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