Panasonic TH-L50B6Z Schematic
ORDER NO. MTV1301099CE
Model No. TH-L50B6Z
Chassis: KM21
Destination: NEW ZEALAND
LED TV
TABLE OF CONTENTS
1 Safety Precautions ----------------------------------------------- 3
1.1. General Guidelines---------------------------------------- 3
1.1.1. Leakage Current Cold Check ---------------------- 3
1.1.2. Leakage Current Hot Check (See Figure
1.) --------------------------------------------------------- 3
2 Warning-------------------------------------------------------------- 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. Service Hint ------------------------------------------------- 6
4 Specifications ----------------------------------------------------- 7
5 Service Mode ------------------------------------------------------ 8
5.1. How to enter into Service Modes ---------------------- 8
5.1.1. Contents of adjustment mode --------------------- 8
5.1.2. How to exit---------------------------------------------- 8
5.1.3. Display of SOS History ------------------------------ 9
5.1.4. POWER ON TIME/COUNT ------------------------ 9
5.1.5. Exit-------------------------------------------------------- 9
5.1.6. Self Check Mode-------------------------------------10
PAG E PAG E
5.1.7. Hotel Mode Adjustment ---------------------------- 10
5.1.8. Hotel Mode-------------------------------------------- 10
6 Troubleshooting Guide --------------------------------------- 11
6.1. Check of the IIC bus lines------------------------------ 11
6.1.1. How to access --------------------------------------- 11
6.1.2. Exit ------------------------------------------------------ 11
6.2. Power LED Blinking timing chart --------------------- 12
6.3. No Power--------------------------------------------------- 12
7 Disassembly and Assembly Instructions--------------- 13
7.1. Speaker Bracket ----------------------------------------- 13
7.2. LCD Panel Assembly ----------------------------------- 14
7.3. LCD Panel Fixing & Handling Method -------------- 15
7.4. LED Panel and Bracket Ass’y------------------------- 16
7.5. Vesa Metal------------------------------------------------- 17
7.6. Side Metal Bracket--------------------------------------- 18
7.7. Metal Bracket 1 ------------------------------------------- 19
7.8. Metal Bracket 2 ------------------------------------------- 20
7.9. Metal Bracket Bottom ---------------------------------- 21
7.10. PCB Installation ------------------------------------------ 22
7.11. Pedestal Ass’y 1------------------------------------------ 23
© Panasonic Corporation 2013.
TH-L50B6Z
7.12. Pedestal Ass’y 2------------------------------------------ 24
7.13. Stand MTG Assy -----------------------------------------25
7.14. Back Cover Installation ---------------------------------26
7.15. Handling SPEC ------------------------------------------- 27
8 Measurements and Adjustments -------------------------- 28
8.1. Voltage chart of A-board-------------------------------- 28
8.2. Voltage chart of P-board-------------------------------- 28
9 Block Diagram --------------------------------------------------- 29
9.1. Main Block Diagram ------------------------------------- 29
10 Wiring Connection Diagram --------------------------------- 30
10.1. Wire Dressing 1------------------------------------------- 30
10.2. Wire Dressing 2------------------------------------------- 31
11 Schematic Diagram--------------------------------------------- 32
12 Printed Circuit Board ------------------------------------------ 57
13 Exploded View and Replacement Parts List -----------64
13.1. Exploded View and Mechanical Replacement
Parts List --------------------------------------------------- 64
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TH-L50B6Z
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 Faston connectors but plug them straight in or unplug them straight
out.
1.1.1. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the
two prongs on the plug.
2. Measure the resistance value, with an ohmmeter,
between the jumpered AC plug and each exposed
metallic cabinet part on the equipment such as
screwheads, connectors, control shafts, etc. When the
exposed metallic part has a return path to the chassis, the
reading should be 100 Mohm and over.
When the exposed metal does not have a return path to
the chassis, the reading must be .
1.1.2. Leakage Current Hot Check (See Figure 1.)
1. Plug the AC cord directly into the AC outlet. Do not use
an isolation transformer for this check.
2. Connect a 1.5kohm, 10 watts resistor, in parallel with a
0.15F capacitors, 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 an AC voltmeter, with 1000 ohms/volt or more
sensitivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the
voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of
the above measurements.
6. The potential at any point should not exceed 0.75 volts
RMS. A leakage current tester (Simpson Model 229 or
equivalent) may be used to make the hot checks, leakage
current must not exceed 1/2 milliamp. In case a
measurement is outside 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
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TH-L50B6Z
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)
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3 Service Navigation
3.1. Service Hint
Board Name Main Device Remarks
A BOARD TUN, OFDM, ADV, LD4, STBY EEP Repairable
P BOARD Power Supply (For 32” include function SW) Repairable
GK BOARD Function SW Repairable
K BOARD LED/RM/CATS Repairable
LD BOARD LED DRIVER Repairable
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4 Specifications
Power
Rating AC 220 - 240 V, 50/60 Hz 0.76 A
Normal (Home) mode 74 W
Standby power consumption 0.2 W
Display panel
Panel TFT LCD Module with LED Backlight
Visible screen size (diagonal) 126 cm (50 inches)
Display Resolution 2,073,600 (1,920 (W) 1,080 (H))
Sound
Speaker (100 mm 30 mm) 2 pcs, 8
Audio Output 20 W (10 W + 10 W), 10% THD
Receiving systems / Band name
Digital TV 8 MHz UHF (New Zealand) free-to-air TV broadcast reception
PAL B / G Reception of Off air broadcasts
PAL 60 Hz Playback of NTSC tape from some PAL Video recorders (VCR)
M.NTSC Playback from M.NTSC Video recorders (VCR)
NTSC Playback from NTSC Video recorders (VCR)
Dimensions (W H D)
With Pedestal (mm) 1,139 739 275
TV only (mm) 1,139 674 89
Mass (Net)
With Pedestal (kg) 18
TV only (kg) 15
Aerial input VHF / UHF
Operating Conditions Temperature : 0C - 35C
Humidity : 20% - 80% RH (non-condensing)
Connection Terminals
AV1 IN AUDIO L - R RCA PIN Type 2 0.5 V[rms]
VIDEO RCA PIN Type 1 1.0 V[p-p] (75 )
COMPONENT Y 1.0 V[p-p] (including synchronization)
P
, PR/C
B/CB
AV2 IN AUDIO L - R RCA PIN Type 2 0.5 V[rms]
VIDEO RCA PIN Type 1 1.0 V[p-p] (75 )
AUDIO OUT AUDIO L - R RCA PIN Type 2 0.5 V[rms]
DIGITAL AUDIO OUT PCM / Dolby Digital / DTS, Fibre optic
HDMI AV IN TYPE A Connectors 2
USB USB 2.0 TYPE A Connectors 1
DC 5 V, Max. 500 mA
R
Note
• Design and Specifications are subject to change without notice. Mass and Dimensions shown are approximate.
±0.35 V[p-p]
TH-L50B6Z
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5 Service Mode
5.1. How to enter into Service Modes
While pressing [VOLUME ( - )] button of the main unit, press [INFO] button of the remote control three times within 2 seconds.
5.1.1. 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.
Main item Sub item Sample Data
ADJUST CONTRAST
COLOUR
TINT
SUB-BRT
BACKLGT
H POS
H AMP
V POS
V AMP
A COM
WB-ADJ R-GAIN 8D
G-GAIN AE
B-GAIN FF
R-CENT 6C
G-RENT 80
B-CENT A0
OPTION Boot ROM
STBY-SET 00
EMERGENCY ON
CLK MODE 00
CLOCK FC7
Y/C DELAY DYNAMIC
OPT 1 00000000
OPT 2 11100110
OPT 3 00001001
OPT 4 00000000
EDID-CLK HIGH
SRV-TOOL 00
DRV CHECK DYNAMIC
5.1.2. How to exit
Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.
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5.1.3. 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].
5.1.4. POWER ON TIME/COUNT
Note : To display TIME/COUNT menu, highlight position, then press MUTE for 3sec.
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.
5.1.5. Exit
1. Disconnect the AC cord from wall outlet.
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5.1.6. Self Check Mode
1. Press the ‘MENU’ button (on the remote control) and the ‘VOL DOWN’ button on the LCD panel.
2. Press ON/OFF button on the panel to Exit.
NOTE: After self check, the following process need to follow.
5.1.7. Hotel Mode Adjustment
1. Press the ‘VOLUME DOWN’ button on the TV panel and simultaneously press the INPUT button on the remote control 3
times to enter Hotel Mode.
2. Set Hotel mode ‘on/off’, then press ‘EXIT’ to come out.
5.1.8. Hotel Mode
1. Purpose
Restrict a function for hotels.
2. Access command to the Hotel mode setup menu.
In order to display the Hotel mode setup menu, please
enter the following command (within 2 second).
[TV] : Vol [Down] + [REMOTE] : INPUT (3 times).
Then, the Hotel mode setup menu is displayed.
3. To exit the Hotel mode setup menu
Disconnect AC power cord from wall outlet.
4. Explain the Hotel mode setup menu
Item Function
Mode Select hotel mode off/on
Initial Input Select input signal modes.
Set the input, when each time power is switched
on.
Selection :
-/RF/HDMI1/HDMI2/HDMI3/Component/
Video/PC
• Off: give priority to a last memory.
Initial POS Select channel when input signal is RF.
Set the channel, each time power is switched
on.
Selection :
Any channel number or [-].
[-] means the channel when turns off.
Initial LEVEL Adjust the volume when each time power is
switched on.
Range :
0 to 100
Maximum Vol
LEVEL
Button Lock Restrict the OSD.
Remote Lock Select front key conditions.
Adjust maximum volume.
Range :
0 to 100
Selection :
OFF/PATTERN1
• OFF: No restriction
• PATTERN1: restriction
Selection :
OFF/PATTERN1/ALL
• OFF: altogether valid.
• PATTERN1: only input key is valid.
• ALL: altogether invalid.
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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
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.
Self-check indication and forced to factory shipment setting:
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. Exit
Disconnect the AC cord from wall outlet.
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6.2. Power LED Blinking timing chart
1. Subject
Information of LED Flashing timing chart.
2. Contents
When an abnormality occurs, the protection circuit will operate and reset the unit to stand by mode. During this time, the
defective block can be identified by the number of blinking times of the Power LED on the front panel of the unit as follow:
Priority SOS detection LED Blink
1 BL_SOS 1
2 SUB_3.3V 7
3SOUND_SOS 9
4 OVP SOS 8
5 GCX/FRC_SOS 10
6 BE(sLD8/PRO4) SOS 12
7 Emergency SOS 13
8IROM-SOS 3
6.3. No Power
First check point
There are following 2 states of No Power indication by power LED.
1. No lit
2. Red is lit then turns red blinking a few seconds later. (See 6.2.)
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7 Disassembly and Assembly Instructions
7.1. Speaker Bracket
1. Fix Speaker Left & Right.
2. Fix Key button.
3. Stick SPONGE at speaker (Left & Right).
TH-L50B6Z
No Description Qty UOM Remarks
01 SPEAKER UNIT 2 PC
02 KEY BUTTON BRACKET 1 PC
03 SPONGE 2 PC 10 100 10t
04 SPONGE 2 PC 10 100 8t
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7.2. LCD Panel Assembly
Install LCD panel to cabinet.
No Description Qty UOM
01 LCD PANEL 1 PC
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7.3. LCD Panel Fixing & Handling Method
1. Place down the cabinet as shown below.
2. Fix LCD panel into the cabinet by taking below precautions.
TH-L50B6Z
Other general precautions
1. Do not press panel surface to avoid blue spot on the panel display.
2. Do not use hard cloth or rub the surface too hard. This may cause scratches on the surface.
3. Take care not to subject the TV’s surface to water or detergent. Any liquid (including pets urine) if enters the product could
lead to TV failure.
4. Take care not to subject the surface to insect repellent, solvent, thiner or other voiltile substances. This may degrade surface
quality or cause peeling of the paint.
5. The surface of the display panel is specially treated and may be easily damaged. Take care not to tap or scratch with your
fingernail or other hard objects.
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7.4. LED Panel and Bracket Ass’y
1. Fixing wire A10 to K PCB.
2. Fixing K PCB to LED Panel.
3. Fixing LED Panel to cabinet.
No Description Qty UOM
01 LED PANEL 1 PC
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7.5. Vesa Metal
1. Fix Vesa Metal & screw.
2. Stick felt at all Vesa Metal - 4 pcs.
TH-L50B6Z
No Part No Description Qty UOM Remarks
01 TKZ5ZX50531 VESA METAL 4 PC
02 TMK4GA333 FELT 4 PC 23 23 0.55t (8mm hole)
03 TMK4GA094 FELT 1 PC 20 24 0.35t
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7.6. Side Metal Bracket
No Description Qty UOM
01 METAL_BRACKET-SIDE (L/R) 8 PC
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7.7. Metal Bracket 1
TH-L50B6Z
No Description Qty UOM
01 METAL LED DRIVER 1 PC
02 METAL VERTICAL L 1 PC
03 METAL VERTICAL R 1 PC
04 METAL MTG A BOARD 1 PC
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7.8. Metal Bracket 2
1. Fix screw all screw.
2. Stick felt at LCD Panel (Control Button & speaker area).
No Description Qty UOM Remarks
01 SCREW (P10/A4/DRIVER4/VESA4) 11 PC 6 ±1 kgf.cm
02 FELT 1 PC 8 110 0.35t
03 FELT 2 PC 15 160 0.9t
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7.9. Metal Bracket Bottom
1. Fix screw at bottom cover.
2. Fix screw at Metal Bracket Bottom.
TH-L50B6Z
No Description Qty UOM Remarks
01 METAL BRACKET BOTTOM 1 PC
02 BOTTOM COVER 1 PC
03 SCREW (P10/A4/DRIVER4/VESA4) 2 PC 6 ±1 kgf.cm
04 SCREW (BTM MTG4) 4 PC 7~8 kgf.cm
05 SCREW (SP4/BTM CVR2) 2 PC 8 ±1 kgf.cm
06 FELT 2 PC 10 140 0.55t
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7.10. PCB Installation
1. Install P & A-Board and fix it with screws.
2. Install Side AV Bracket and fix with screws.
No Description Qty UOM Remarks
01 SCREW (P10/A4/DRIVER4/VESA4) 8 PC 6 ±1 kgf.cm
02 SCREW (SP4) 4 PC 8 ±1 kgf.cm
03 CHASSIS BRACKET (A-BOARD) 2 PC
04 CHASSIS BRACKET (LED) 2 PC
05 GROUND SPRING 4 PC
06 SIDE AV BRACKET 1 PC
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7.11. Pedestal Ass’y 1
Fix Rubber foot 6 pc at base cover.
TH-L50B6Z
No Part No Description Qty UOM
01 TBL5ZA34581 PEDESTAL BASE 1 PC
02 TBL5ZB33341 BASE COVER 1 PC
03 TMK4GA027 FELT 3 PC
04 TBL5ZA34511 NECK BASE 1 PC
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7.12. Pedestal Ass’y 2
Fix Rubber foot 6 pc at base cover.
No Part No Description Qty UOM Remarks
01 TBL4GG3009 RUBBER FOOT 7 PC
02 XTS4 + 10GFJ SCREW 5 PC 11 ± 2 kgf.cm
03 XYN5 + F15FJ SCREW 4 PC 14 ± 2 kgf.cm
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7.13. Stand MTG Assy
1. Insert stand metal in plastic bag.
2. Insert screw in plastic bag (2 type).
3. Fold plactic bag and stick paper tape.
4. Stick barcode label at plastic bag.
TH-L50B6Z
No Part No Description Qty UOM
01 TQF4GA267 QR CODE LABEL 1 PC
02 TPE4GH091 BAG 1 PC
03 TBL5ZA34551 STAND_METAL 1 PC
04 XYN4 + F12FJK SCREW 4 PC
05 XSS5 + 16FJK SCREW 4 PC
06 T5E4G62400 YELLOW MASKING TAPE 0.13 MT
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