11Schematic Diagram---------------------------------------------2812Printed Circuit Board------------------------------------------5113Exploded View and Replacement PartsList-----------57
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TH-55GX800S
1Safety 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 followingleakagecurrent checks to prevent the customerfrom being exposedto shock hazards.
4.When conducting repairs and servicing, donot attempt to modify the equipment, its parts or its materials.
5.When wiring units (withcables, flexible cables or lead wires) are supplied asrepair parts and only one wire or some of thewires havebeenbroken or disconnected, do not attempt torepair or re-wire the units. Replace the entire wiring unit instead.
6.When conducting repairs andservicing, donot twist the Faston connectors but plugthemstraight in or unplug themstraightout.
1.1.1.Leakage Current Cold Check
1.Unplug the AC cord and connect a jumper between thetwo prongs on the plug.
2.Measure the resistance value, with an ohmmeter,between the jumpered AC plug and each exposedmetallic cabinet part on the equipment such asscrewheads, connectors, control shafts, etc. When theexposed metallic part has areturnpathto the chassis, thereading should be8.5Mohm to 13Mohm.When the exposed metal does not have a return path to the chassis, thereading must be .
1.1.2.Leakage Current Hot Check (SeeFigure 1.)
1.Plug the AC cord directly into the AC outlet. Do not usean isolation transformer for this check.
2.Connect a 1.5kohm, 10 watts resistor, in parallel with a
0.15F capacitors, between each exposed metallic parton 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 moresensitivity, to measure the potential across theresistor.
4.Check each exposed metallic part, and measure thevoltage at each point.
5.Reverse the AC plug in the AC outlet and repeat each ofthe abovemeasurements.
6.The potential at any point should not exceed 0.75 voltsRMS. A leakage current tester (Simpson Model 229 orequivalent) may be used to make the hot checks, leakagecurrent must not exceed 1/2 milliamp. Incase ameasurement is outside of the limits specified, there isapossibility of a shock hazard, and the equipment shouldbe repaired and rechecked before it is returned to thecustomer.
Figure 1
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TH-55GX800S
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. Thefollowing techniques should be used to help reducethe incidence of component damagecaused by electrostatic discharge(ESD).
1.Immediately before handling any semiconductor component orsemiconductor-equippedassembly, drain off any ESDon yourbody bytouching a known earth ground. Alternatively,obtainand wear a commercially available discharging ESD wrist strap,which should be removedfor 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 onaconductive surface such asaluminum foil, toprevent electrostatic charge builduporexposure of theassembly.
3.Useonly a grounded-tip solderingiron tosolder or unsolder ES devices.
4.Use only an anti-staticsolder removal device. Some solder removal devices not classified as [anti-static (ESD protected)] cangenerate electrical chargesufficient 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. (Mostreplacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil orcomparable conductive material).
7.Immediately before removing the protective material fromtheleads of a replacement ES device, touch the protective materialto the chassis or circuit assembly into which the device will beinstalled.
Caution
Besurenopower is appliedto 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 thebrushingtogether 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).
2.2.About lead free solder (PbF)
Note: Lead islisted 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 usedin our manufacturing process and discussed below is (Sn+Ag+Cu).That is Tin(Sn), Silver (Ag) and Copper (Cu) although other types areavailable.
This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For service and repairwork, we’dsuggest the use ofPb freesolderas well, although Pb solder may beused.
PCBs manufacturedusing lead freesolder will have the PbF within a leaf Symbol PbF stamped onthe back ofPCB.
Caution
•Pb free solder has a higher melting point than standard solder. Typically the melting point is 50 ~ 70°F (30~40°C) higher. Pleaseuse a high temperature soldering iron andset it to 700 ± 20 °F (370 ± 10°C).
•Pb free solder will tend to splashwhen heated toohigh(about 1100°For 600 °C).If you must use Pbsolder, please completely remove all of the Pb free solder on the pins or solder area before applyingPbsolder. If this is not practical, be sure toheat thePb 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 theopposite side. (see figurebelow)
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3Service Navigation
3.1.Service Hint
TH-55GX800S
Board NameMain DeviceRemarks
A BOARDTUN, OFDM, ADV, LD4, STBY EEPRepairable
P BOARDPower SupplyRepairable
GK BOARDFunction SW Repairable
K BOARDLED/RM/CATSRepairable
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TH-55GX800S
4Specifications
Dimensions (W H D)1231 mm 769 mm 218 mm (With Pedestal)
1231 mm 714 mm 44 mm (TV only)
Mass
Power sourceAC Auto 110-240 V, 50 / 60 HzRated power consumption171 W Standby power consumption0.50 W Visible screen size (diagonal)139 cm Display resolution3840 (W) 2160 (H)PanelLED backlight Liquid Crystal DisplaySound
Speaker output 20 W (10 W + 10 W)Headphones 3.5 mm stereo mini jack 1
Connection terminals
AV INVIDEOPin jack 1, 1.0 V[p-p] (75 )(COMPONENT / VIDEO)AUDIO L - RPin jack 2, 0.5 V[rms]
HDMI 1 / 2 / 3 inputTYPE A Connectors
This TV supports “HDAVI Control 5” function. ETHERNET10BASE-T / 100BASE-TXUSB 1 / 2 / 3
*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.
Standard Compliance
Bluetooth 4.2
Frequency Range
2.402 GHz - 2.480 GHz
Note
•Design andSpecifications are subject to change without notice. Mass and Dimensions shown are approximate.
•Forinformation about the open source software, refer to [eHELP] (Search by Purpose> ReadFirst >Before use>Licence).
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TH-55GX800S
5CS Maintenance Menu
5.1.How to enter into CS Maintenance Menu
5.1.1.Purpose
After exchange parts, check and adjust the contents of adjustment mode.
Whilepressing [VOLUME ( - )] buttonof the main unit, press [INFO]button of the remote control three times within 2 seconds.
Note:
CSMaintenanceMenu can not be enteredwhen 3Dsignal input.Input 2Dsignalto enter CS Maintenance Menu.
5.1.2.Key command
Press the Cursor key [Up/Down] ontheremote controlto select the functions.
5.1.3.How to exit
Press the [EXIT] button on the remote control.
5.2.Repack
1.Select [OPT] inCS Maintenance Menu.
1.Press [OK] buttonor Cursor key [Right] on theremotecontrol.
Note:
Press the [Exit] button orthe [Return] button on the remote control.
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5.3.EDID Clock
1. Select [EDID CLK] in CS Maintenance Menu.
2. Press [OK] button or Cursor key [Right] on the remote control.
Exit:
Press the [Exit] buttonor the [Return] button on the remote control.
5.4.USB HDD Drive Check
1.Select [DRV CHECK] inCS MaintenanceMenu.
2.Press [OK] button or Cursor key [Right] onthe remote control.
TH-55GX800S
Exit:
Press the [Return] button ontheremote control.
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TH-55GX800S
5.5.White Balance Adjustment
After LCD PANEL or A-Board is replaced and repaired, perform [White balance adjustment] in case of necessity for test / check
([White balance adjustment] is not required basically).
1. Select [W/B ADJ] in CS Maintenance Menu.
2. Press [OK] button on the remote control.
Note for performing [White balance adjustment]
Make a note for the setting values before changing if the settings of [R-GAIN], [B-GAIN] and [G-GAIN] in [WB-ADJ] will bechanged.
3.Press the cursor key [Up/Down] on the remote control to change the data value, and press [OK] button on the remote controlto store the value for thismodel.
COLOR TEMP : Press the [Option] buttonof the remote control tochange the color temperature. (COOL/NORMAL/WARM/TUNING)
Exit:
Press the [Return] button onthe remote control.
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TH-55GX800S
5.6.Hotel mode
5.6.1.Purpose
Restrict a function for hotels.
5.6.2.Access command to the Hotel
mode setup menu
In order todisplay the Hotel mode setup menu, pleaseenter the following command(within 2 seconds). [TV]:Vol.[Down] + [REMOTE] : AV (3 times)
Then, the Hotel mode setup menuis displayed.
5.6.3.To exit the Hotel mode setup menu
Switch off the power with the [POWER] buttonon the main unit
or the [POWER] button on the remote control.
5.6.4.Explain the Hotel mode setup menu
ItemFunction
Hotel ModeSelect hotel mode On/Off
Initial INPUTSelect input signal modes.
Initial POSSelect programme number.
Initial VOL LevelAdjust the volume when each time power is
Maximum VOLLevel
Button LockSelect local key conditions.
Remote LockSelect remote control key conditions.
Private InformationSelect private information for VIERA Cast is Keep
Set the input, when each time power is switched
on.
Selection :
•Off, Analogue TV, Digital TV, AV, HDMI1, HDMI2, HDMI3
•Off: give priority to a last memory.
Selection :Off/0 to 99
•Off: give priority to a last memory.
switched on.Selection Range :Off/0 to 100
•Off: give priority to a last memory.
Adjust maximum volume.Range :0 to 100
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.)
Selection :Off/SETUP/MENU
•OFF: altogether valid.
•SETUP: only Setup menu is invalid.
•MENU: Picture/Sound/Setup menu are invalid.
or Reset if Hotel mode is set to [On] when TVpower onSelection :Keep/Reset
•Keep: private information for VIERA Cast is keep
•Reset: private information for VIERA Cast is reset
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TH-55GX800S
5.7.Data Copy by USB Memory
Note:
SD card can not be used for Data Copy.
5.7.1.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 installinganumber of units inhotel or any facility, the data in master TV can be copied toUSB Memory and thencopy to other TVs.
5.7.2.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 areain a USB Memory window, point to New, and then click text document. A new file is createdby 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 thefileto the following file namefor (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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5.7.3.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 willbe copied from TV set to USB Memory.It takes around2to 6 minutes maximum for copying.
4.After the completion of copying to USB Memory, removeUSB Memory from TV set.
5.Turn off theTVset.
Note:
Following new folder willbe created in USB Memory for data from TV set.(a)For Board replacement : user_setup(b)For Hotel : hotel
TH-55GX800S
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TH-55GX800S
5.7.4.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 copyingto USB Memory, remove USB Memory from TVset.(a)For Board replacement : Data will be deleted after copying (Limitedone copy).(b)For Hotel : Datawill not be deleted andcan be used for other TVs.
5.Turn off the TV set.
Note:
1.Depending on the failure of boards, function of Datacopy for board replacement does not work.
2.This function can beeffective among the same model numbers.
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TH-55GX800S
6Troubleshooting 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 TVreception 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
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
6.2.Power LED Blinking timing chart
1.SubjectInformation of LED Flashing timing chart.
2.ContentsWhen anabnormality occurs, the protection circuit willoperate and reset the unit to stand by mode. During this time, thedefective block canbe identified by the number of blinking times of the Power LED onthe front panel of the unit as follow:
PriorityNameFactorR_LED Blink
1BL_SOSSOS from PANEL inverter1
2TV_SOSTCON power down3
3SOUND_SOSSOS from audio AMP9
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TH-55GX800S
6.3.Method of detecting SOS
1. BL_SOS
Detection beginning after one second pass from ‘BL_ON’=ON
2.TV_SOSDetection beginning after one second pass from ‘AMP_SHUTDOWN’=ON
3.SOUND_SOSDetection beginning ‘AMP_SHUTDOWN’=ON
6.4.LCD Panel test mode
Purpose:
To findthe possible failure point where in LCD Panel or Printed Circuit Board when the abnormal picture is displayed.
How to Enter:
Whilepressing [VOLUME ( - )] buttonof the main unit, press [OPTION] button of theremote control three times within2seconds.
How to Exit:
Disconnect AC plug from wall outlet.
How to confirm:
If the abnormal pictureis displayed, gointoLCD Panel test mode to display the several test patterns.Andthen, judgeby the followingmethod.Still abnormal pictureis displayed:The cause must be in LCD Panel.Normal picture is displayed: Thecause must be inA board.
Remarks:
The test pattern is created by the circuit in LCD Panel.In LCD Panel test mode, this test pattern isdisplayed unaffected by signal processing for RF or input signal.If the normalpicture is displayed,LCD Panelmust be okay andthecause of failure must be inA board.
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6.5.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.)
TH-55GX800S
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TH-55GX800S
7Disassembly and Assembly Instructions
7.1.Bracket Fitting
1. Fix vesa metal to panel and screw.
2. Stick barrier at panel.
3. Assembly pcb at led panel.
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NoDescriptionQtyUOMRemark
1ASS’Y 55 IN-HOUSE PANEL1PCRefer part list
2SCREW4PC06 ± 1 Kgf.cm
3LED_PANEL1PC
4LED_PANEL_CASE1PC
5BARRIER_P-PCB_49B11PC
6BTM_METAL_L_49G2PC
7BTM_METAL_R_49G2PC
8VESA_METAL-49B14PC
TH-55GX800S
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TH-55GX800S
7.2.PCB Fixing
1. Fix side bracket at pcb.
2. Fix key button at pcb.
3. Fix wifi module at bracket and fix at panel.
NoDescriptionQtyUOMRemark
1KEY BUTTON BRACKET1PC
2BT_ANT_CABLE1PC
3SCREWPC06 ± 1 Kgf.cm
4GASKET1PC
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7.3.Speaker Fixing
1. Fix speaker at panel and ensure fully insert.
2. Fix spacer at pcb.
TH-55GX800S
NoDescriptionQtyUOMRemark
1SPEAKER-L1PC
2SPEAKER-R1PC
3PET_TAPE0.11MT 110mm 1 pc
4WIFI_BT_MODULE1PC
5WIFI-BT_MD_BRACKET1PC
6SCREW2PC06 ± 1 Kgf.cm
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TH-55GX800S
7.4.Back Cover - Screw
1. Fix back cover and screw.
2. Fix latch at back cover.
3. Fix rear cover and terminal cover at back cover.
NoDescriptionQtyUOMRemarks
1SCREW(BC6)2PC06 ± 1 Kgf.cm
2SCREW(VESA4)4PC06 ± 1 Kgf.cm
3SCREW_FOR_BOTTOM5PC06 ± 1 Kgf.cm
4TERMINAL_COVER1PC55GX800
5LATCH3PC55GX800
6REAR_COVER1PC55GX800
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7.5.Handling SPEC
■ Moving the LCD module
The module should be handle by two people and hold on that top and bottom long side by both hands without module
warping. Never handle the module with keeping horizontal position when moving the module in order to avoid internal
damage anddeformation. Never drop or hit the module.
■About the work table
When tightening a screw, retention structures are required not to deform theLCD module.
■Moving the TV
Holdthe specified parts as shown tostandthe TV upand move it withtwo people.
TH-55GX800S
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TH-55GX800S
8Measurements and Adjustments
8.1.Voltage chart of A-board
Set A-Board to a dummy set and check the satisfaction with the specified voltage as following table.
Power Supply NameTest PointVoltage (V)Target Board
STB5VTP20265.1V ± 5%ALL
GNDTP20060VALL
BL_SOSTP20410VALL
F15VTP2003, TP200515.7V ± 5%ALL
GNDTP2008, TP20110VALL
8.2.Voltage chart of P-board
Set P-Board toadummy load andcheck the satisfaction with the specified voltage as followingtable.