Panasonic Tx l50em6b Service Manual And Repair Guide
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PAGES:73
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Panasonic Tx l50em6b Service Manual And Repair Guide
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 cover label TBM4GU113 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.
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.
TABLE OF CONTENTS:
Panasonic Tx l50em6b Service Manual And Repair Guide
CONTENTS
SAFETY PRECAUTIONS 3
GENERAL GUIDE 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 NAVIGATION 6
CHASSIS BOARD LAYOUT 6
SERVICE HINTS 7
APPLICABLE SIGNALS 8
SPECIFICATIONS 9
TECHNICAL DESCRIPTION …11
SPECIFICATION OF KEY FOR CI PLUS
AND MAC 11
GENERAL INFORMATION 11
REPLACEMENT OF ICS 11
MODEL AND KEYS 11
SETTING INSPECTION 12
SERVICE MODE FUNCTION 13
SERVICE 14
SERVICE TOOL MODE 15
HOTEL MODE 16
DATA COPY BY USB MEMORY 17
DATA COPY FROM TV SET TO USB MEMORY 18
DATA COPY FROM USB MEMORY TO TV SET 19
OPTION BYTES DESCRIPTION 20
SELF CHECK 21
POWER LED BLINKING TIMING CHART 22
LCD PANEL TEST MODE 22
ADJUSTMENT METHOD 23
WIRING DIAGRAM 24
BLOCK DIAGRAM (1 OF 2) 25
PARTS LOCATION 27
LOCATION OF LEAD WIRING 29
REPLACEMENT PARTS LIST NOTE 30
REPLACEMENT PARTS LIST 31
SCHEMATIC DIAGRAMS NOTE 49
A-BOARD (1 OF 14) SCHEMATIC DIAGRAM 50
P-BOARD (1 OF 2) SCHEMATIC DIAGRAM 64
GK-BOARD SCHEMATIC DIAGRAM 66
K-BOARD SCHEMATIC DIAGRAM 67
CONDUCTOR VIEWS 68
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