Panasonic TH-L55WT50M User manual

© Panasonic Corporation 2012.
Unauthorized copying and distribution is a violation
of law.
ORDER NO.MTV1206116CE
LCD TV
Model No. TH-L55WT50M
LA34 Chassis

2
TABLE OF CONTENTS
PAGE 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
3.2. Applicable signals------------------------------------------7
4 Specifications ------------------------------------------------------8
5 Technical Descriptions---------------------------------------- 10
5.1. Specification of KEY for DTCP-IP, One-to-
One, Widevine and Netflix ----------------------------- 10
6 Service Mode ----------------------------------------------------- 11
6.1. How to enter into Service Mode ---------------------- 11
6.2. Service tool mode---------------------------------------- 13
6.3. DRV Check - USB HDD Check----------------------- 14
6.4. Hotel mode------------------------------------------------- 14
6.5. Data Copy by SD Card --------------------------------- 15
7 Troubleshooting Guide---------------------------------------- 18
7.1. Check of the IIC bus lines------------------------------ 18
7.2. Power LED Blinking timing chart --------------------- 19
7.3. LCD Panel test mode ----------------------------------- 19
8 Disassembly and Assembly Instructions --------------- 20
8.1. Disassembly Flow Chart for the Unit ---------------- 20
8.2. Disassembly Procedure for the Unit----------------- 20
9 Measurements and Adjustments -------------------------- 33
9.1. Voltage chart of A-board------------------------------- 33
10 Block Diagram --------------------------------------------------- 35
10.1. Main Block Diagram ------------------------------------- 35
10.2. Block (1/2) Diagram ------------------------------------- 36
10.3. Block (2/2) Diagram ------------------------------------- 37
11 Wiring Connection Diagram --------------------------------- 39
11.1. Caution statement.--------------------------------------- 39
11.2. Wiring 1----------------------------------------------------- 39
11.3. Wiring 2----------------------------------------------------- 40
11.4. Wiring 3----------------------------------------------------- 41
11.5. Wiring 4----------------------------------------------------- 42
11.6. Wiring 5----------------------------------------------------- 43
12 Schematic Diagram--------------------------------------------- 45
12.1. Schematic Diagram Note ------------------------------ 45
12.2. A-Board (1/16) Schematic Diagram ----------------- 46
12.3. A-Board (2/16) Schematic Diagram ----------------- 47
12.4. A-Board (3/16) Schematic Diagram ----------------- 48
12.5. A-Board (4/16) Schematic Diagram ----------------- 49
12.6. A-Board (5/16) Schematic Diagram ----------------- 50
12.7. A-Board (6/16) Schematic Diagram ----------------- 51
12.8. A-Board (7/16) Schematic Diagram ----------------- 52
12.9. A-Board (8/16) Schematic Diagram ----------------- 53
12.10. A-Board (9/16) Schematic Diagram ----------------- 54
12.11. A-Board (10/16) Schematic Diagram --------------- 55
12.12. A-Board (11/16) Schematic Diagram---------------- 56
12.13. A-Board (12/16) Schematic Diagram --------------- 57
12.14. A-Board (13/16) Schematic Diagram --------------- 58
12.15. A-Board (14/16) Schematic Diagram --------------- 59
12.16. A-Board (15/16) Schematic Diagram --------------- 60
12.17. A-Board (16/16) Schematic Diagram --------------- 61
12.18. K-Board Schematic Diagram ------------------------- 62
12.19. LD-Board Schematic Diagram ----------------------- 63
12.20. LP-Board Schematic Diagram------------------------ 64
13 Printed Circuit Board------------------------------------------ 65
13.1. A-Board ---------------------------------------------------- 65
13.2. K-Board ---------------------------------------------------- 67
13.3. LD-Board--------------------------------------------------- 68
13.4. LP-Board--------------------------------------------------- 69
14 Exploded View and Replacement Parts List----------- 71
14.1. Exploded View and Mechanical Replacement
Parts List --------------------------------------------------- 71
14.2. Electrical Replacement Parts List ------------------- 74

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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 which 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
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 U1and U2, does not exceed the following values:
For a. c.: U1= 35 V (peak) and U2= 0.35 V (peak);
For d. c.: U1= 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.
Figure 1

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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 LED, Cat's eye
P-Board Power supply, Power switch, Control Button
Non serviceable.
P-Board should be exchanged for service.
LP-Board LOGO LED
LD-Board LED Drive

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3.2. Applicable signals
QCOMPONENT (Y, PB, PR) (from AV2 terminal), HDMI
* Mark: Applicable input signal
QPC (from D-sub 15P)
Applicable input signal for PC is basically compatible to VESA standard timing.
QPC (from HDMI terminal)
Applicable input signal for PC is basically compatible to HDMI standard timing.
Note
• Signals other than above may not be displayed properly.
• The above signals are reformatted for optimal viewing on your display.
• PC signal is magnified or compressed for display, so that it may not show fine detail with sufficient clarity.
Signal name COMPONENT HDMI
525 (480) / 60i, 60p * *
625 (576) / 50i, 50p * *
750 (720) / 60p, 50p * *
1,125 (1,080) / 60i, 50i * *
1,125 (1,080) / 60p, 50p, 24p *
Signal name Horizontal frequency (kHz) Vertical frequency (Hz)
640 ×480 @60 Hz 31.47 59.94
800 ×600 @60 Hz 37.88 60.32
852 ×480 @60 Hz 31.44 59.89
1,024 ×768 @60 Hz 48.36 60.00
1,280 ×1,024 @60 Hz 63.98 60.02
1,280 ×768 @60 Hz 47.70 60.00
1,366 ×768 @60 Hz 48.39 60.04
Signal name Horizontal frequency (kHz) Vertical frequency (Hz)
640 ×480 @60 Hz 31.47 60.00
1,280 ×720 @60 Hz 45.00 60.00
1,920 ×1,080 @60 Hz 67.50 60.00

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4 Specifications
QTV
Power Source AC 110 - 240 V, 50 / 60 Hz
Power Consumption
Power Rating 143 W
Standby condition 0.2 W
Display panel
Panel system IPS LED backlight Liquid Crystal Display
Visible screen size (diagonal) 139 cm / 55 inches
Number of pixels 2,073,600 (1,920 (W) ×1,080 (H))
Dimensions (W ×H ×D) 1,236 mm ×804 mm ×335 mm (With Pedestal)
1,236 mm ×726 mm ×27 mm (TV only)
Mass 19.5 kg Net (With Pedestal)
17.0 kg Net (TV only)
Sound
Speaker 8 train speakers ×2, Woofer ( 75 mm) ×1
Audio output 18 W (4 W + 4 W + 10 W)
Headphones M3 (3.5 mm) stereo mini Jack ×1
Receiving systems / Band name
Receiving Channels
VHF BAND
2-12 (PAL/SECAM B, K1) 0-12 (PAL B AUST.)
1-9 (PAL B N.Z.) 1-12 (PAL/SECAM D)
1-12 (NTSC M Japan) 2-13 (NTSC M USA)
UHF BAND
21-69 (PAL G, H, I/SECAM G, K, K1)
28-69 (PAL B AUST.) 13-57 (PAL D, K)
13-62 (NTSC M Japan) 14-69 (NTSC M USA)
CATV
S1-S20 (OSCAR) 1-125 (USA CATV)
C13-C49 (JAPAN) S21-S41 (HYPER)
Z1-Z37 (CHINA) 5A, 9A (AUST.)
Aerial - Rear VHF / UHF
Operating Conditions
Temperature: 0 °C - 40 °C
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 Ω)
AUDIO OUT
AUDIO L - R RCA PIN Type ×2 0.5 V [rms] (high impedance)
AV2 IN
AUDIO L - R RCA PIN Type ×2 0.5 V [rms]
COMPONENT Y 1.0 V [p-p] (including synchronisation)
PB/CB, PR/CR± 0.35 V [p-p]
VIDEO RCA PIN Type ×1 1.0 V [p-p] (75 Ω)
HDMI 1 / 2 / 3 / 4 input TYPE A Connectors
• This TV supports "HDAVI control 5" function.
PC HIGH-DENSITY D-SUB 15PIN
R,G, B: 0.7 V [p-p] (75 Ω)
HD, VD: TTL Level 2.0 - 5.0 V [p-p] (high impedance)
• Applicable input signals: VGA, SVGA, WVGA, XGA, SXGA, WXGA
Card slot SD Card slot ×1
ETHERNET 10BASE-T / 100BASE-TX
USB 1 / 2 / 3 USB 2.0 TYPE A Connectors DC 5 V, Max. 500 mA
DIGITAL AUDIO OUT PCM / Dolby Digital / DTS, Fibre optic

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Q3D Eyewear (TY-ER3D4MA)
Note
Design and Specifications are subject to change without notice. Mass and Dimensions shown are approximate.
Built-in wireless LAN
Standard compliance and
Frequency range*1
IEEE 802.11a/n
5.15 GHz - 5.35 GHz, 5.47 GHz - 5.85 GHz
IEEE 802.11b/g/n
2.40 GHz - 2.4835 GHz
Security WPA2-PSK (TKIP/AES) WPA-PSK (TKIP/AES) WEP (64 bit/128 bit)
Bluetooth wireless technology*2
Standard Compliance Bluetooth 3.0
Frequency Range 2.402 GHz - 2.480 GHz
*1: The frequency and channel differ depending on the country.
*2: Not all the Bluetooth compatible devices are available with this TV. Up to 5 devices can be used simultaneously
(except the 3D Eyewear and the VIERA Touch Pad Controller).
Dimensions (W ×H ×D) 167.7 mm ×42.2 mm ×170.7 mm
Mass Approx. 31 g
Lens type Liquid Crystal Shutter
Usage temperature range 0 °C - 40 °C
Battery* Coin-shaped lithium battery CR2025
Operation time: Approx. 75 hours in continuous use of the battery made by Panasonic
Viewing range* Within 3.2 m from front surface of the TV
Materials Main body: Resin
Lens section: Liquid crystal glass
Communication system 2.4 GHz band FH-SS (Frequency Hopping Spread Spectrum)
* There are differences in the viewing range of the 3D Eyewear among individuals.
• The 3D Eyewear may not operate correctly at the outside of the viewing range.

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5 Technical Descriptions
5.1. Specification of KEY for DTCP-IP, One-to-One, Widevine and Netflix
5.1.1. General information:
1. EEPROM (IC8902) for spare parts has the seed of KEY for each.
2. The final KEY data will be generated by Peaks IC (IC8000) when SELF CHECK was done and are stored in both Peaks IC
(IC8000) and EEPROM (IC8902).
Four KEY are not generated for all models.
The necessary KEY are only generated and stored depend on the feature of models.
5.1.2. Replacement of ICs:
When Peaks IC (IC8000) is replaced, EEPROM (IC8902) should be also replaced with new one the same time.
When EEPROM (IC8902) is replaced, Peaks IC (IC8000) is not necessary to be replaced the same time.
After the replacement of IC, SELF CHECK should be done to generate the final KEY data.
How to SELF CHECK: While pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote control for more
than 3 seconds.
TV will be forced to the factory shipment setting after this SELF CHECK.
5.1.3. Model and Keys:
Model No. Keys
One-to-One
(For USB Rec.)
DTCP-IP WIDEVINE Netflix
TH-L55WT50M None None Yes Yes

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6 Service Mode
6.1. How to enter into Service Mode
6.1.1. Purpose
After exchange parts, check and adjust the contents of adjustment mode.
While pressing [VOLUME ( - )] button of the main unit, press [i] button of the remote control three times within 2 seconds.
Note:
Service Mode can not be entered when 3D signal input.
Input 2D signal to enter Service Mode.
6.1.2. 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
[RED] button...All Sub items Selection in reverse direction
[GREEN] button...All Sub items Selection in forward direction
[VOL] button...Value of sub items change in forward direction ( + ), in reverse direction ( - )
6.1.3. 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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6.1.4. 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.
Main item Sub item Sample Data Remark
ADJUST CONTRAST 252
COLOR 46
TINT 00
SUB-BRT 800
BACKLGT 200
H-POS 0
H-AMP 0
V-POS 0
V-AMP 0
V COM 153
WB-ADJ R-GAIN 80
G-GAIN 71
B-GAIN 61
R-CENT 7E
G-CENT 80
B-CENT 91
OPTION Boot ROM Factory Preset
STBY-SET 00
CLK MODE 00
CLOCK 000
EMERGENCY ON
Y/C Delay 1
OPT 1 10110000
OPT 2 11100110
OPT 3 00001001
OPT 4 00000010
EDID-CLK MID
SRV-TOOL 00 See Service tool mode
DRV CHECK USBHDD CHECK 00 See DRV Check-USBHDD Check

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6.2. Service tool mode
6.2.1. How to access
1. Select [SRV-TOOL] in Service Mode.
2. Press [OK] button on the remote control.
6.2.2. 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 will be cleared by [Self-check indication and forced to factory shipment setting].
6.2.3. 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.
6.2.4. Exit
1. Disconnect the AC cord from wall outlet or switch off the power with [ Power ] button on the main unit.

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6.3. DRV Check - USB HDD Check
1. Select [DRV Check - USBHDD Check] in Service Mode.
2. Press [OK] button on the remote control for more than 3 seconds.
6.4. 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:
While pressing [VOLUME (-)] button of the main unit,
press [AV] button of the remote control three times within
2 seconds.
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
Hotel Mode Select hotel mode On/Off
Initial INPUT Select input signal modes.
Set the input, when each time power is switched
on.
Selection :
Off,TV,AV1,AV2,PC,HDMI1,HDMI2,
HDMI3,HDMI4
• Off: give priority to a last memory.
Initial POS Select programme number.
Selection :
Off/0 to 99
• Off: give priority to a last memory
Initial VOL Level Adjust the volume when each time power is
switched on.
Selection/Range :
Off/0 to 100
• Off: give priority to a last memory
Maximum VOL
Level
Adjust maximum volume.
Range :
0 to 100
Button Lock Select local key conditions.
Selection :
Off/SETUP/MENU/ALL
• Off: altogether valid
• SETUP: only F-key is invalid
(Tuning guide (menu) can not be selected.)
• MENU: only F-key is invalid
(only Volume/Mute can be selected.)
• ALL: altogether invalid.
Remote Lock Select remote control key conditions.
Selection :
Off/SETUP/MENU
• Off: altogether valid
• SETUP: only Setup menu is invalid
• MENU: Picture/Sound/Setup menu are invalid
Private Information Select private information for VIERA Cast is Keep
or Reset if Hotel mode is set to [On] when TV
power on.
Selection :
Keep/Reset
• Keep: private information for VIERA Cast is
keep
• Reset: private information for VIERA Cast is
reset

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6.5. Data Copy by SD Card
6.5.1. 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 SD card 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 SD card and then copy to other
TVs.
6.5.2. Preparation
Make pwd file as startup file for (a) or (b) in a empty SD card.
1. Insert a empty SD card to your PC.
2. Right-click a blank area in a SD card 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 SD card.

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6.5.3. Data copy from TV set to SD Card
1. Turn on the TV set.
2. Insert SD card with a startup file (pwd file) to SD slot.
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 SD card.
It takes around 2 to 6 minutes maximum for copying.
4. After the completion of copying to SD card, remove SD card from TV set.
5. Turn off the TV set.
Note:
Following new folder will be created in SD card for data from TV set.
(a) For Board replacement : user_setup
(b) For Hotel : hotel

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6.5.4. Data copy from SD Card to TV set
1. Turn on the TV set.
2. Insert SD card with Data to SD slot.
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 SD card to TV set.
4. After the completion of copying to SD card, remove SD card 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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7 Troubleshooting Guide
Use the self-check function to test the unit.
1. Checking the IIC bus lines
2. Power LED Blinking timing
7.1. Check of the IIC bus lines
7.1.1. How to access
7.1.1.1. 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.
7.1.1.2. 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.
7.1.2. Screen display
7.1.3. Check Point
Confirm the following parts if NG was displayed.
7.1.4. Exit
Disconnect the AC cord from wall outlet or switch off the power with [ Power ] button on the main unit.
DISPLAY Check Ref. No. Description Check Point
TUN TU6705 TUNER A-BOARD
STBY IC8000 PEAKS-PRO4(STM) A-BOARD
MEM1 IC8902 PEAKS EEPROM A-BOARD
MEM2 IC8900 NAND FLASH A-BOARD
AVSW IC3001 AV SW A-BOARD
LAN IC8600ETHERPHY A-BOARD
ZWEI ZWEI LCD PANEL
ID2 ID2 A-BOARD
BT IC8000, A21 BLUETOOTH A-BOARD/BLUETOOTH
WiFi IC8000, A20 WiFi A-BOARD/WiFi

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7.2. 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.
7.3. 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:
While pressing [VOLUME ( - )] button of the main unit, press [OPTION] button of the remote control three times within 2
seconds.
How to Exit:
Disconnect AC plug from wall outlet.
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 BACK LIGHT SOS LCD PANEL
P-Board
3 STM IROM BOOT PROGRAM SOS A-Board
P-Board
7 SUB 3.3V SENSE SOS A-Board
8 SOS (T-CON power) A-Board
9 SOUND SOS A-Board
Speaker
10 ZWEI/FRC SOS A-Board
12 BE SOS A-Board
13 EMERGENCY SOS A-Board
20 2nd BOOT PROGRAM SOS
(Watchdog timer over flow)
A-Board
21 2nd BOOT PROGRAM SOS
(System error)
A-Board
22 2nd BOOT PROGRAM SOS
(Main system bus freeze)
A-Board
23 2nd BOOT PROGRAM SOS
(Accidental interrupt signal)
A-Board
24 2nd BOOT PROGRAM SOS
(NAND Flash memory data transfer error finish)
A-Board
25 2nd BOOT PROGRAM SOS
(Unsupported NAND Flash memory)
A-Board

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8 Disassembly and Assembly Instructions
8.1. Disassembly Flow Chart for the Unit
This is a disassembly chart.
When assembling, perform this chart conversely.
8.2. Disassembly Procedure for the Unit
8.2.1. Pedestal
1. Lay down the unit so that the rear cover faces upward.
2. Remove the 2 screws.
3. Remove the cover.
4. Remove the 4 screws.
5. Remove the pedestal.
8.2.2. WiFi dongle
1. Remove the 1 screw.
2. Remove the WiFi dongle.