TX-20LA60F, TX-20LA60P, TX-20LA6F, TX-20LA6P — Panasonic TV Service Manual (repair manual)

Model
TX-20LA60F TX-20LA60P TX-20LA6F TX-20LA6P
Pages
36
Size
7.83 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / SL-131PP CHASSIS
File
tx-20la60f-tx-20la60p-tx-20la6f-tx-20la6p.pdf
Date

View Panasonic TX-20LA60F / TX-20LA60P / TX-20LA6F / TX-20LA6P Service Manual online

ORDER NO. PCZ06
10103CE 
Service Manual
LCD TV
Power Source
 
AC 220-240V, 50Hz.
Power Consumption
 
Average use: 41W
 Standby 
condition: 
1W
LCD
 
VGA (640 × 480 pixels)
 
4:3 aspect ratio LCD panel
Screen Size
 
408 mm(W) × 306 mm(H)
Sound
 
Speaker
 
 
9 cm × 5cm, 2pcs, 4Ω
 Audio 
Output
 
 
4W (2W + 2W), 20% THD
 Headphones
 
 
M3 (3.5 mm) Jack x 1
Receiving Systems/ Band name
 VHF 
 
BAND I: CH2-CH4
 
 
 BAND II: CH5-CH12
 
UHF HYPER BAND :SI’-S3’, S1-S20
 
 
BAND IV, V : CH21-CH68
PAL-B/G, D/K, SECAM-L/L’, NTSC(AV input only) 
Aerial-Rear
  
UHF/VHF
TX-20LA60F
TX-20LA60P
TX-20LA6F
TX-20LA6P
SL-131PP Chassis
Operating Conditions
 
 
Temperature: -10°C ~ 40°C
 
 
Humidity: 0%-90% RH (non-condensing)
Connection Terminals
 AV1 
(Scart 
connecter)
 
 
21 Pin terminal (Audio/Video in, Audio/Video out, RGB in)
 AV2
  
VIDEO
  
 
RCA 
PIN 
Type 
× 
1
  
S-VIDEO
 
    Mini DIN 4-pin
  
AUDIO 
L-R
 
    RCA PIN Type × 2
Dimensions (W x H x D)
 
Including TV Stand
 
  498mm(W) × 260mm(D) × 493mm(H)
 TV 
Set 
Only
 
  498mm(W) × 95mm(D) × 451mm(H)
Weight
  
10.9kg 
Net
Note:
Design and Specifications are subject to change without notice.
Weight and Dimensions shown are approximate.
2
TX-20LA6
TX-20LA60
CONTENTS
  
  
Page
1. Safety  Precautions  ----------------------------------------------- 3
  
 1.1. 
General 
Guidelines 
 
-------------------------------------- 3
  
 1.2. 
Touch-Current 
Check 
 
------------------------------------ 3
2. Prevention of Electro Static Discharge (ESD) to
  Electrostatically Sensitive (ES) Devices  ------------------ 4
3 About lead free solder (PbF)  --------------------------------- 5
4. Self  Check    ---------------------------------------------------------- 6
5. Chasis Board Layout  -------------------------------------------- 7
6. Before  servicing   -------------------------------------------------- 8
     6.1. Wire dressing  ---------------------------------------------- 8
7. Disassembly  for  service   --------------------------------------- 9
  
 7.1. 
Stand 
ass´y 
 
------------------------------------------------ 9
  
 7.2. 
Back 
cover 
 
------------------------------------------------- 9
  
 7.3. 
CTRL 
ass´y 
 
-----------------------------------------------10
  
 7.4. 
Power 
Swith 
ass´y 
 
--------------------------------------10
  
 7.5. 
LED 
ass´y 
 
-------------------------------------------------10
     7.6. Headphone ass’y  ----------------------------------------10
     7.7. Speaker (left and right)  --------------------------------- 11
  
 7.8. 
TTL 
ass’y 
--------------------------------------------------- 11
     7.9. Power Module  -------------------------------------------- 11
  
 7.10. 
Main 
ass´y 
 
----------------------------------------------- 11
  
 7.11.Panel 
LCD 
-------------------------------------------------12
      
Page
8
. Service Mode Function  ----------------------------------------13
     8.1. How to enter SERVICE  --------------------------------13
     8.2. How to exit SERVICE  ----------------------------------13
     8.3. Option Description  --------------------------------------14
9. Conduct Views  ---------------------------------------------------15
     9.1. Foil Side  ---------------------------------------------------15
  
 9.2. 
Component 
Side 
 
-----------------------------------------17
10. Block and Schematic Diagrams  --------------------------19
     10.1. Schematic Diagram Notes  ---------------------------19
     10.2. Block Diagram  ------------------------------------------20
  
 10.3. 
Schematic 
Diagram 
 
-----------------------------------21
11. Parts Location & Replacement Parts List  -------------28
     11.1. Different Part List ---------------------------------------28
  
 11.2. 
Exploded 
View 
 
------------------------------------------29
  
 11.3. 
Stand 
Assy 
Exploded 
View 
 
--------------------------30
     11.4. Packing Exploded Views  -----------------------------30
     11.5. Electrical Replacement Parts List  ------------------31
TX-20LA6
TX-20LA60
3
1
. Safety Precautions
1.1. General Guidelines
 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 leakage current checks to prevent the customer from being exposed to shock hazards.
1.2. 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 Figure 1.
  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 (TOUGH CURRENT) expressed as voltage U1 and U2, does not exceed the following values: 
For a. c.: U
1
 = 35 V (peak) and U
2
 = 0.35 V (peak);
For d. c.: U
1
 = 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.
4
TX-20LA6
TX-20LA60
2
.  Prevention of Electro Static 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 electro static 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 almi-
num foil, to prevent electrostatic charge buildup 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, alminum 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 hamless motion such as the brush-
ing 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).
Page of 36

Download Panasonic TX-20LA60F / TX-20LA60P / TX-20LA6F / TX-20LA6P Service Manual (Repair Manual)

Here you can view online or download Panasonic TX-20LA60F / TX-20LA60P / TX-20LA6F / TX-20LA6P Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Panasonic TX-20LA60F / TX-20LA60P / TX-20LA6F / TX-20LA6P TV. Information contained in Panasonic TX-20LA60F / TX-20LA60P / TX-20LA6F / TX-20LA6P service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).