TH-55LFV8U, TH-55LFV8W (serv.man2) - Panasonic TV Service Manual (repair manual)

th-55lfv8u, th-55lfv8w (serv.man2) service manual
Model
TH-55LFV8U TH-55LFV8W (serv.man2)
Pages
41
Size
8.82 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / FULL HD LCD DISPLAY
File
th-55lfv8u-th-55lfv8w-sm2.pdf
Date

Read Panasonic TH-55LFV8U / TH-55LFV8W (serv.man2) Service Manual online

Model No.
 
TH-55LFV8U
                   TH-55LFV8W
 
FULL HD LCD Display
ORDER NO.  VED1708659CE
  
 WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It dose not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. 
vice or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
There are special components used in this equipment which are important for safety. These parts are marked by 7 in the schematic 
diagram, circuit board 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
For replacement parts and exploded view, refer to the separated manual "PARTS LIST".
Rev.-1(2017-9)
2
PREFACE
<55LFV8U/W>
Table of Contents
1. Safety Precautions
2. Warning
3. Specifications
SECTION 1 SERVICE INFORMATION
1. Name of each part
2. Notes on Service
3. Service Mode
4. Troubleshooting Guide
SECTION 2 DISASSEMBLY PROCEDURES
1. Parts Locations
2. Parts Disassembly
3. Replacement of LCD Panel Module
SECTION 3 ADJUSTMENTS
1. Software Update Procedures
SECTION 4 DIAGRAMS
1. Block Diagrams
3
PREFACE
<55LFV8U/W>
1. Safety Precautions
3
TH-50LFC70U/TH-50LFC70W
1 Safety Precautions
1.1. General Guidelines
1. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.
2. When wiring units (with cables, flexible cables or lead wires) are supplied as repair parts and only one wire or some of the
wires have been broken or disconnected, do not attempt to repair or re-wire the units. Replace the entire wiring unit instead.
3. When conducting repairs and servicing, do not twist the Fasten connectors but plug them straight in or unplug them straight
out.
4. When servicing, observe the original lead dress. If a short circuit is found, replace all parts have been overheated or damaged
by the short circuit.
5. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
6. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
1.2. Touch-Current Check (for TH-50LFC70U)
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 (TOUCH CURRENT) shall not exceed 0.5 MIU.
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.
Figure 1
1.1. General Guidelines
1.2. Touch current check (for TH-55LFV8U)
4
PREFACE
<55LFV8U/W>
4
TH-50LFC70U/TH-50LFC70W
1.3. Touch-Current Check (for TH-50LFC70W)
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 (TOUCH CURRENT) expressed as voltage U
1
 and U
2
, 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 U
2
 = 0.35 V (peak) for a. c. and U
1
 = 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 U
1
 = 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.
Figure 1
1.2. Touch current check (for TH-55LFV8W)
Page of 41
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Here you can read online and download Panasonic TH-55LFV8U / TH-55LFV8W (serv.man2) Service Manual in PDF. TH-55LFV8U / TH-55LFV8W (serv.man2) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Panasonic TH-55LFV8U / TH-55LFV8W (serv.man2) TV. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.