Panasonic TX-48AS640B User manual

© Panasonic Corporation 2014.
Unauthorized copying and distribution is a violation
of law.
ORDER NO.PCZ1405115CE
LCD Television
Model No. TX-48AS640B
TX-48AS640E
TX-48ASR650
LA51 Chassis

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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
4 Specifications ------------------------------------------------------7
5 Technical Descriptions------------------------------------------9
5.1. Specification of KEY for CI Plus, DTCP-IP,
One-to-One, Widevine, Netflix and HDCP-----------9
6 Service Mode ----------------------------------------------------- 10
6.1. How to enter into Service Mode ---------------------- 10
6.2. Service tool mode---------------------------------------- 12
6.3. DRV Check - USBHDD Check------------------------ 13
6.4. Hotel mode------------------------------------------------- 13
6.5. Data Copy by USB Memory --------------------------- 14
7 Troubleshooting Guide---------------------------------------- 17
7.1. Check of the IIC bus lines------------------------------ 17
7.2. Power LED Blinking timing chart --------------------- 19
7.3. LCD Panel test mode ----------------------------------- 19
7.4. No Power--------------------------------------------------- 20
8 Disassembly and Assembly Instructions --------------- 21
8.1. Disassembly Flow Chart for the Unit ---------------- 21
8.2. Disassembly Procedure for the Unit----------------- 22
8.3. Specification of EMI countermeasures ------------- 26
9 Measurements and Adjustments -------------------------- 30
9.1. Voltage chart of P-board-------------------------------- 30
9.2. Voltage chart of A-board------------------------------- 30
10 Block Diagram --------------------------------------------------- 31
10.1. Block Diagram (1/2) ------------------------------------- 31
10.2. Block Diagram (2/2) ------------------------------------- 32
11 Wiring Connection Diagram --------------------------------- 33
11.1. Wiring Diagram ------------------------------------------- 33
11.2. Caution statement.--------------------------------------- 34
11.3. Dressing Wire --------------------------------------------- 34

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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
P-Board Power
K-Board IR/LED/CATS
GK-Board SWITCH

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4 Specifications
Product fiche
TV
Energy efficiency class A+
Visible screen size (diagonal) 121 cm / 48 inches
On mode average power consumption (B/E) 63 W
Annual energy consumption *1 (B/E) 88 kWh
Rated power consumption (R) 106 W
On mode power consumption / screen area (R) 0.010 W / cm2
Standby power consumption *2 0.20 W
Off mode power consumption 0.20 W
Screen resolution 1 920 (W) 1 080 (H)
*1: Energy consumption XYZ kWh per year, based on the power consumption of the television operating 4 hours per day for 365 days.
The actual energy consumption will depend on how the television is used.
*2: when the TV is turned off with the remote control and no function is active.
For the information of rated power consumption, refer to the label on the TV back cover.
Dimensions (W × H × D)
1 087 mm 676 mm 260 mm (With Pedestal) (B/E)
1 087 mm 632 mm 57 mm (TV only) (B/E)
1 087 mm 677 mm 214 mm (With Pedestal) (R)
1 087 mm 632 mm 57 mm (TV only) (R)
Mass
15.0 kg Net (With Pedestal)
14.0 kg Net (TV only)
Power source AC 220-240 V, 50 / 60 Hz
Panel LED LCD panel
Sound
Speaker output 20 W (10 W + 10 W)
Headphones M3 (3.5 mm) stereo mini Jack 1
Connection terminals
AV1 input / output
SCART (Audio/Video in, Audio/Video out, RGB in)
AV2 input (COMPONENT / VIDEO)
VIDEO RCA PIN Type 1 1.0 V [p-p] (75 )
AUDIO L - R RCA PIN Type 2 0.5 V [rms]
Y1.0 V [p-p] (including synchronisation)
PB/CB, PR/CR± 0.35 V [p-p]
HDMI 1 / 2 / 3 input TYPE A Connectors
HDMI 1 / 3 : 3D, Content Type
HDMI 2 : 3D, Content Type, Audio Return Channel
• This TV supports "HDAVI control 5" function.
Card slot Common Interface slot (complies with CI Plus) 1
ETHERNET RJ45, IEEE802.3 10BASE-T / 100BASE-TX
USB 1 / 2
USB1 / 2: DC 5 V, Max. 500 mA [Hi-Speed USB (USB 2.0)]
DIGITAL AUDIO output PCM / Dolby Digital / DTS, Fibre optic
Receiving systems / Band name (B)
Check the latest information on the available services at the following website.
http://panasonic.net/viera/support
DVB-T / T2 Digital terrestrial services
(UK)
PAL I UHF E21 - 68
(Ireland)
PAL I VHF A - J
CATV S1 - S20
UHF E21 - E69
CATV S21 - S41 (Hyperband)
PAL 525/60 Playback of NTSC tape from some PAL Video recorders (VCR) or NTSC disc playback from
DVD player and recorder
M.NTSC Playback from M.NTSC Video recorders (VCR)
NTSC (AV input only) Playback from NTSC Video recorders (VCR)

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3D Eyewear (B)
Note
• 3D Eyewear (B) and Touch Pad Controller (B/E) use Bluetooth wireless technology.
• Design and Specifications are subject to change without notice. Mass and Dimensions shown are approximate.
• For the information of the open source software, refer to [eHELP] (Support > Licence).
• This equipment complies with the EMC standards listed below. (B/E)
EN55013, EN61000-3-2, EN61000-3-3, EN55020, EN55022, EN55024 (B/E)
Receiving systems / Band name (E)
Check the latest information on the available services at the following website. (English only)
http://panasonic.net/viera/support
DVB-C Digital cable services (MPEG2 and MPEG4-AVC(H.264))
DVB-T / T2 Digital terrestrial services (MPEG2 and MPEG4-AVC(H.264))
PAL B, G, H, I, SECAM B, G, SECAM L, L’
VHF E2 - E12
CATV (S01 - S05)
VHF H1 - H2 (ITALY)
CATV S1 - S10 (M1 - M10)
VHF A - H (ITALY)
CATV S11 - S20 (U1 - U10)
UHF E21 - E69
CATV S21 - S41 (Hyperband)
PAL D, K, SECAM D, K VHF R1 - R2
VHF R6 - R12
VHF R3 - R5
UHF E21 - E69
PAL 525/60 Playback of NTSC tape from some PAL Video recorders (VCR)
M.NTSC Playback from M.NTSC Video recorders (VCR)
NTSC (AV input only) Playback from NTSC Video recorders (VCR)
Receiving systems / Band name (R)
Check the latest information on the available services at the following website. (English only)
http://panasonic.net/viera/support
DVB-C Digital cable services (MPEG2 and MPEG4-AVC(H.264))
DVB-T / T2 Digital terrestrial services (MPEG2 and MPEG4-AVC(H.264))
PAL D, K, SECAM D, K
VHF R1 - R2
VHF R6 - R12
VHF R3 - R5
UHF E21 - E69
PAL 525/60 Playback of NTSC tape from some PAL Video recorders (VCR)
M.NTSC Playback from M.NTSC Video recorders (VCR)
NTSC (AV input only) Playback from NTSC Video recorders (VCR)
Aerial input
(UK) UHF
(Ireland) / E / R VHF / UHF
Operating Conditions
Temperature: 0 °C - 35 °C
Humidity: 20 % - 80 % RH (non-condensing)
Built-in wireless LAN
Standard compliance and Frequency range*1
IEEE802.11a/n (B/E) 5.180 GHz - 5.320 GHz, 5.500 GHz - 5.580 GHz, 5.660 GHz - 5.700 GHz
IEEE802.11a/n (R) 5.15 GHz - 5.35 GHz, 5.47 GHz - 5.85 GHz
IEEE802.11b/g/n (B/E) 2.412 GHz - 2.472 GHz
IEEE802.11b/g/n (R) 2.400 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. (B/E)
The frequency and channel differ depending on the country. Follow the regulations of your country for the frequency range. (R)
*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 Touch Pad Controller). (B)
Not all the Bluetooth compatible devices are available with this TV. Up to 5 devices can be used simultaneously
(except Touch Pad Controller). (E)
Not all the Bluetooth compatible devices are available with this TV. Up to 5 devices can be used simultaneously. (R)
Dimensions (W H D) 165 mm 38 mm 166 mm
Mass Approx. 18 g
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
Materials
Main body Resin
Lens section Liquid crystal glass

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5 Technical Descriptions
5.1. Specification of KEY for CI Plus, DTCP-IP, One-to-One, Widevine, Netflix
and HDCP
5.1.1. General information:
1. eMMC (IC8903) for spare parts has the seed of KEY for each.
2. The final KEY data will be generated by Main IC (IC8000) when SELF CHECK was done and are stored in both Main IC
(IC8000) and eMMC (IC8903).
All 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 Main IC (IC8000) is replaced, eMMC (IC8903) should be also replaced with new one the same time.
When eMMC (IC8903) is replaced, Main 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.)
CI Plus DTCP-IP WIDEVINE Netflix HDCP2
TX-48AS640B None Yes Yes Yes Yes Yes
TX-48AS640E None Yes Yes Yes Yes Yes
TX-48ASR650 None Yes None Yes 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 [ RED ] 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
Press the [3/4] button to change the adjustment values or function.
Press the [1/2] button to step up/down through the functions and adjustments.
Press the numerical button [VOLUME (+/-)] to change of each option item.
Press the [OK] button after each adjustment has been made to store the required values.
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 24E
COLOR 2E
TINT 00
SUB-BRT 800
BACKLGT FFF
H-POS 0
H-AMP 0
V-POS 0
V-AMP 0
WB-ADJ R-GAIN 80
G-GAIN 3B
B-GAIN 1A
R-CENT 71
G-CENT 80
B-CENT 7B
OPTION Boot ROM Factory Preset
STBY-SET 00
CLK MODE 00
CLOCK 000
EMERGENCY ON
Y/C Delay 0
OPT 1 00000100
OPT 2 11101110
OPT 3 00000001
OPT 4 00000000
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 except 2nd and 1st occurrence after shipment will be cleared by [Self-check indication and forced to factory
shipment setting].
6.2.3. POWER ON Time, On/Off
Note : To display TIME/COUNT menu, highlight position, then press MUTE for 3 seconds.
Time : Cumulative power on time, indicated hour : minute by decimal
On/Off : Number of On/Off switching by decimal
Note : This indication will not be cleared by either of the self-checks or any other command.
6.2.4. Exit
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 - USBHDD 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
6.4.1. Purpose
Restrict a function for hotels.
6.4.2. Access command to the Hotel
mode setup menu
In order to display the Hotel mode setup menu,
please enter the following command (within 2 seconds).
[TV]: Vol.[Down] + [REMOTE] : AV (3 times)
Then, the Hotel mode setup menu is displayed.
6.4.3. To exit the Hotel mode setup menu
Switch off the power with the [POWER] button on the main unit
or the [POWER] button on the remote control.
6.4.4. 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, Analogue, DVB (B), DVB-C (E/R),
DVB-T (E/R), AV1, AV2, HDMI1, HDMI2, HDMI3
• 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
• 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.)
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 USB Memory
Note:
SD card can not be used for Data Copy.
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 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.
6.5.2. 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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6.5.3. 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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6.5.4. 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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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

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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 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 TU6705 TUNER A-BOARD
H90STBY IC8000 PEAKS-LD6 (STM) A-BOARD
H92MEM1 IC8000 BLOCK-EEP A-BOARD
H91MEM2 IC8901 STM EEPROM A-BOARD
H17LAN IC8650 ETHERPHY A-BOARD
H00FE IC6800 DEMOD A-BOARD
H96ID ID A-BOARD
H97ID2 ID2 A-BOARD
H45BT BLUETOOTH A-BOARD/BLUETOOTH
H42WiFi 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:
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 BL SOS LCD PANEL
P-Board
3 (fast blinking) IROM SOS A-Board
7 SUB 3.3V A-Board
9 SOUND SOS A-Board
Speaker
12 BE SOS A-Board
13 EMERGENCY SOS A-Board

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7.4. No Power
First check point
There are following 3 states of No Power indication by power LED.
1. No lit
2. Green is lit then turns red blinking a few seconds later. (See Power LED Blinking timing chart)
3. Only red is lit.