Panasonic TH-50LRU70 User manual

© Panasonic Corporation 2014.
Unauthorized copying and distribution is a violation
of law.
ORDER NO.MTNC140637CE
Hospitality LCD HDTV
Model No. TH-50LRU70
LA50 Chassis

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TABLE OF CONTENTS
PAGE
1 Safety Precautions -----------------------------------------------3
1.1. General Guidelines ----------------------------------------3
1.2. Touch-Current Check--------------------------------------3
2Warning--------------------------------------------------------------4
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatically Sensitive (ES) Devices ----------4
2.2. About lead free solder (PbF) ----------------------------5
3 Service Navigation------------------------------------------------6
3.1. PCB Layout --------------------------------------------------6
4 Specifications ------------------------------------------------------7
5 Service Mode -------------------------------------------------------8
5.1. How to enter into Service Mode ------------------------8
5.2. SRV-TOOL---------------------------------------------------9
5.3. Data Copy by USB Memory --------------------------- 10
6 Troubleshooting Guide---------------------------------------- 13
6.1. Check of the IIC bus lines------------------------------ 13
6.2. Power LED Blinking timing chart --------------------- 14
6.3. LCD Panel test mode ----------------------------------- 14
7 Disassembly and Assembly Instructions --------------- 15
7.1. Disassembly Flow Chart for the Unit ---------------- 15
7.2. Disassembly Procedure for the Unit----------------- 15
8 Measurements and Adjustments -------------------------- 21
8.1. Voltage chart of P-board-------------------------------- 21
8.2. Voltage chart of A-board------------------------------- 21
9 Block Diagram --------------------------------------------------- 22
9.1. Main Block Diagram ------------------------------------- 22
9.2. Block (1/2) Diagram ------------------------------------- 23
9.3. Block (2/2) Diagram ------------------------------------- 24
10 Wiring Connection Diagram --------------------------------- 25
10.1. Caution statement.--------------------------------------- 25
10.2. Wiring 1 ----------------------------------------------------- 25
10.3. Wiring 2 ----------------------------------------------------- 26

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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.
4. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.
5. 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.
6. When conducting repairs and servicing, do not twist the Fasten connectors but plug them straight in or unplug them straight
out.
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 (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.

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2Warning
2.1. 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 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, 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 ham less 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).

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2.2. About lead free solder (PbF)
Note: Lead is listed as (Pb) in the periodic table of elements.
In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder.
The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu).
That is Tin (Sn), Silver (Ag) and Copper (Cu) although other types are available.
This model uses Pb Free solder in it's manufacture due to environmental conservation issues. For service and repair work, we'd
suggest the use of Pb free solder as well, although Pb solder may be used.
PCBs manufactured using lead free solder will have the PbF within a leaf Symbol PbF stamped on the back of PCB.
Caution
• Pb free solder has a higher melting point than standard solder. Typically the melting point is 50 ~ 70 F (30~40 C) higher. Please
use a high temperature soldering iron and set it to 700 ± 20 F (370 ± 10 C).
• Pb free solder will tend to splash when heated too high (about 1100 F or 600 C).
If you must use Pb solder, please completely remove all of the Pb free solder on the pins or solder area before applying Pb
solder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder.
• After applying PbF solder to double layered boards, please check the component side for excess solder which may flow onto the
opposite side. (see figure below)
Suggested Pb free solder
There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu (tin, silver, copper) solder.
However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder can also be used.

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3 Service Navigation
3.1. PCB Layout
Board Name Function
A-Board Main
K-Board IR/LED/CATS
P-Board Power Supply
GK-Board Power switch, Control Button

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4 Specifications
Note
Design and Specifications are subject to change without notice. Mass and Dimensions shown are approximate.
Power Source AC 110-127 V, 60Hz
Power Consumption
Rated Power Consumption 110 W
Standby condition Under 1.0 W
Display Panel
Panel System LCD panel (LED backlight)
Screen size 50 inch class (49.5 inches measured diagonally)
W x H x Diagonal 43.1 inch x 24.2 inch x 49.5 inch (1,096 mm x 616 mm x 1,257 mm)
Number of pixels 2,073,600 (1,920 (W) x 1,080 (H)) [5,760 X 1,080 dots]
Speaker Output 20 W [10W + 10 W ]
Channel Capability (Digital/Analog) VHF/ UHF: 2 - 69, CATV: 1 - 135 (support MPEG4 H.264 decode)
PC Signals VGA, SVGA, XGA, WXGA, SXGA Horizontal scanning frequency 31- 69 kHz
Vertical scanning frequency 59 - 86 Hz
FEATURES 3D Y/C FILTER, CLOSED CAPTION, V-Chip, Vesa compatible, Integrated Pro: Idiom
Operating Conditions Temperature: 32 °F - 95 °F (0 °C - 35°C)
Humidity: 20 % - 80 % RH (non-condensing)
Connection Terminals
VIDEO IN VIDEO: RCA PIN Type x 1 1.0 V[p-p] (75Ω)
AUDIO L - R: RCA PIN Type x 2 0.5 V [rms]
COMPONENT IN Y: RCA PIN Type x 1 1.0 V[p-p] (including synchronization)
Pb: RCA PIN Type x 1 ±0.35 V [p-p]
Pr: RCA PIN Type x 1 ±0.35 V [p-p]
AUDIO L - R: RCA PIN Type x 2 0.5 V [rms]
HDMI 1-3 TYPE A Connector x 3 (This TV supports [HDAVI Control 5] function)
PC IN D-SUB 15PIN: R, G, B / 0.7 V [p-p] (75Ω)
HD, VD / 1.0 - 5.0 V [p-p] (high impedance)
AUDIO: M3 JACK x 1 0.5 V [rms]
USB USB2.0 Type A connector DC 5V, Max. 500mA
DIGITAL AUDIO OUT PCM / Dolby Digital / DTS, Fiber Optic
OTHERS ETHERNET (10BASE-T/100BASE-TX)
Dimensions (W x H x D)
Including pedestal 44.4 inch x 28.2 inch x 9.9 inch (1,126 mm x 716 mm x 250 mm)
TV Set only 44.4 inch x 25.7 inch x 2.1 inch (1,126 mm x 652 mm x 54 mm)
Mass
Including pedestal 37.7 lb. (17.1 kg) NET
TV Set only 32.0 lb. (14.5 kg) NET

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5 Service Mode
5.1. How to enter into Service Mode
5.1.1. Set “Hotel Mode” Off
Service Mode can not be entered if Hotel Mode is “On” (Activating). Hotel Mode should be set to “Off” by using only Remote Control
as following procedure.
1. Press [MENU], [G], [Y] and [0] buttons on the remote control by turns to display “Hotel Mode setup menu”.
2. Select the item “Mode” and set “Off” status.
3. Select the item “Save” and press [OK] button.
4. Disconnect the AC cord from wall outlet, or press and hold the [POWER] button at right side on the main unit for 10 seconds
or more.
5.1.2. Enter into Service Mode
While pressing [VOLUME ( - )] button of the main unit, press [INFO] button of the remote control three times within 2 seconds.
5.1.3. Key command
[1] button...Main items Selection in forward direction
[2] button...Main items Selection in reverse direction
[3] button...Sub items Selection in forward direction
[4] button...Sub items Selection in reverse direction
[VOL] button...Value of sub items change in forward direction ( + ), in reverse direction ( - )
5.1.4. Contents of adjustment mode
• Value is shown as a hexadecimal number.
• Preset value differs depending on models.
• After entering the adjustment mode, take note of the value in each item before starting adjustment.
5.1.5. How to exit
Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.
Main item Sub item Sample Data Remark
ADJUST CONTRAST 000
COLOR 3C
TINT 00
SUB-BRT 800
BACKLGT FFF
B-Y-G 40
R-Y-A 00
WB-ADJ R-GAIN 7A
G-GAIN 80
B-GAIN 79
R-CENT 80
G-CENT 80
B-CENT 7E
OPTION Boot ROM Factory Preset.
STBY-SET 00
EMERGENCY ON
CLK MODE 00
CLOCK 000
EDID-CLK HIGH
SRV-TOOL 00 See next.

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5.2. SRV-TOOL
5.2.1. How to access
1. Select [SRV-TOOL] in Service Mode.
2. Press [OK] button on the remote control.
5.2.2. Display of SOS History
SOS History (Number of LED blinking) indication.
From left side; Last SOS, before Last, three occurrence before, 2nd occurrence after shipment, 1st occurrence after shipment.
This indication except 2nd and 1st occurrence after shipment will be cleared by [Self-check indication and forced to factory
shipment setting].
5.2.3. POWER ON TIME/COUNT
Note : To display TIME/COUNT menu, highlight position, then press MUTE for 3 sec.
Time : Cumulative power on time, indicated hour : minute by decimal
Count : Number of ON times by decimal
Note : This indication will not be cleared by either of the self-checks or any other command.
5.2.4. Exit
Disconnect the AC cord from wall outlet or press the [POWER] button on the main unit for 3 seconds to turn off and then turn on
automatically.

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5.3. Data Copy by USB Memory
Note:
SD card can not be used for Data Copy.
5.3.1. Purpose
(a) Board replacement (Copy the data when exchanging A-board):
When exchanging A-board, the data in original A-board can be copied to USB Memory and then copy to new A-board.
(b) Hotel (Copy the data when installing a number of units in hotel or any facility):
When installing a number of units in hotel or any facility, the data in master TV can be copied to USB Memory and then copy to
other TVs.
5.3.2. Preparation
Make pwd file as startup file for (a) or (b) in a empty USB Memory.
1. Insert a empty USB Memory to your PC.
2. Right-click a blank area in a USB Memory window, point to New, and then click text document. A new file is created by default
(New Text Document.txt).
3. Right-click the new text document that you just created and select rename, and then change the name and extension of the
file to the following file name for (a) or (b) and press ENTER.
File name:
(a) For Board replacement : boardreplace.pwd
(b) For Hotel : hotel.pwd
Note:
Please make only one file to prevent the operation error.
No any other file should not be in USB Memory.

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5.3.3. Data copy from TV set to USB Memory
1. Turn on the TV set.
2. Insert USB Memory with a startup file (pwd file) to USB terminal.
On-screen Display will be appeared according to the startup file automatically.
3. Input a following password for (a) or (b) by using remote control.
(a) For Board replacement : 2770
(b) For Hotel : 4850
Data will be copied from TV set to USB Memory.
It takes around 2 to 6 minutes maximum for copying.
4. After the completion of copying to USB Memory, remove USB Memory from TV set.
5. Turn off the TV set.
Note:
Following new folder will be created in USB Memory for data from TV set.
(a) For Board replacement : user_setup
(b) For Hotel : hotel

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5.3.4. Data copy from USB Memory to TV set
1. Turn on the TV set.
2. Insert USB Memory with Data to USB terminal.
On-screen Display will be appeared according to the Data folder automatically.
3. Input a following password for (a) or (b) by using remote control.
(a) For Board replacement : 2771
(b) For Hotel : 4851
Data will be copied from USB Memory to TV set.
4. After the completion of copying to USB Memory, remove USB Memory from TV set.
(a) For Board replacement : Data will be deleted after copying (Limited one copy).
(b) For Hotel : Data will not be deleted and can be used for other TVs.
5. Turn off the TV set.
Note:
1. Depending on the failure of boards, function of Data copy for board replacement does not work.
2. This function can be effective among the same model numbers.

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6 Troubleshooting Guide
Use the self-check function to test the unit.
1. Checking the IIC bus lines
2. Power LED Blinking timing
6.1. Check of the IIC bus lines
6.1.1. How to access
6.1.1.1. Self-check indication only:
Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [OK] button on the remote control
for more than 3 seconds.
6.1.1.2. Self-check indication and forced to factory shipment setting:
Caution:
New key will be generated and previous TV programmes recorded in USB HDD will not be viewed. (See USB HDD
Recording)
Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote
control for more than 3 seconds.
6.1.2. Screen display
6.1.3. Check Point
Confirm the following parts if NG was displayed.
6.1.4. Exit
Disconnect the AC cord from wall outlet or press the [POWER] button on the main unit for 3 seconds to turn off and then turn on
automatically.
DISPLAY Check Ref. No. Description Check Point
H14TUN IC6750/JK6750 TUNER A-Board
H90STBY IC8000 sLD8/STM A-Board
H91MEM2 IC8900 NAND DLASH A-Board
H17LAN IC8000/JK8600 Etherphy A-Board
H-FRSC IC6103 MPU A-Board
H-PRID IC6000 Pro: Idiom A-Board

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6.2. Power LED Blinking timing chart
1. Subject
Information of LED Flashing timing chart.
2. Contents
When an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the
defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.
6.3. LCD Panel test mode
Purpose:
To find the possible failure point where in LCD Panel or Printed Circuit Board when the abnormal picture is displayed.
How to Enter:
First set “Hotel Mode” to Off (Refer to 5.1.1).
While pressing [VOLUME ( - )] button of the main unit, press [OPTION] button of the remote control three times within 2
seconds.
How to Exit:
Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.
How to confirm:
If the abnormal picture is displayed, go into LCD Panel test mode to display the several test patterns.
And then, judge by the following method.
Still abnormal picture is displayed: The cause must be in LCD Panel.
Normal picture is displayed: The cause must be in A board.
Remarks:
The test pattern is created by the circuit in LCD Panel.
In LCD Panel test mode, this test pattern is displayed unaffected by signal processing for RF or input signal.
If the normal picture is displayed, LCD Panel must be okay and the cause of failure must be in A board.
Blinking Times Contents Check point
1 LED driver: BL_SOS LCD PANEL
P-Board
3 P o w e r o n P r o b l e m
(No F15V / SUB3.3V / SUB1.5V voltage)
A-Board
P-Board
7 No voltage SUB3.3V detected A-Board
9 Audio Amplifier: SOUND_SOS A-Board
Speaker
12 Back End SOS (inside of Peaks) A-Board
13 Emergency SOS A-Board

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7 Disassembly and Assembly Instructions
7.1. Disassembly Flow Chart for the Unit
This is a disassembly chart.
When assembling, perform this chart conversely.
7.2. Disassembly Procedure for the Unit
To disassemble P.C.B., wait for 1 minute after power was off for
discharge from electrolysis capacitors.
7.2.1. Pedestal
1. Lay down the unit so that the rear cover faces upward.
2. Remove the 4 screws.
3. Remove the pedestal.
NOTE: One security screw (THE2AC004J) may be attached
among the four screws to the pedestal assembly. Use star
screwdriver size T-20 for disassembly and assembly.
7.2.2. Back Cover
1. Remove the 9 screws (A).
2. Remove the 14 screws (B).
3. Remove the 2 screws (C).
4. Remove the Back Cover.

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7.2.3. P-Board
1. Remove the 5 screws.
2. Disconnect the connectors (P2, P4 and P5).
3. Remove the P-Board.
4. Remove the P-PCB Barrier.
7.2.4. A-Board
1. Remove the 4 screws.
2. Disconnect the connectors (A02, A10, A11 and A12).
3. Remove the Side AV Bracket.
4. Remove the A-Board.
5. Remove the CH Mount Boss and Ground Spring.
7.2.5. Vesa Metals
1. Remove the 4 screws.
2. Remove the 4 Vesa Metals.
7.2.6. Bottom Metal
1. Remove the 4 screws.
2. Remove the 2 Bottom Metals.

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7.2.7. GK-Board
1. Remove the Control Unit.
2. Disconnect the connector (GK4).
3. Remove the GK-Board and the Key Button Bracket.
7.2.8. Speakers
1. Remove the 2 speakers.
2. Remove the 4 screws.
3. Remove the 4 SP Brackets.
7.2.9. K-Board / LCD PANEL
1. Remove the LED Panel Assy from the Cabinet.
2. Disconnect the connector (K10).
3. Remove the LED panel, the K-Board and the LED Panel
Case.
4. Remove the LCD PANEL.

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7.2.10. Felt, Sponge, and so on.

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