Sony BRAVIA KDL-40HX750 Installation guide

SERVICE / TRAINING MANUAL
LCD Digital Color TV
AZ3F Chassis
Segment: 3a
9-888-462-04
Self Diagnosis
Supported model
Version Date Subject
1.0 2/2/2012 Original Manual Release Date
2.0 2/9/2012 Added Power and Control Block Diagram. Reissue entire manual.
3.0 3/6/2012 Corrected connector on Power and Control Block Diagram. Replaced page 13, 14, & 16.
  ModiedUpdatesandAdjustmentssection.Replacedpages28&29.
4.0 5/2/2012 Corrected part number for Support Belt Kit. Replaced page 25.
  RemovedBUadjustmentinformation.(Notrequiredforthesemodels.)Replacedpages27-44.
ORIGINAL MANUAL ISSUE DATE: 2/2012
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:

SERVICE / TRAINING MANUAL
LCD Digital Color TV
AZ3F Chassis
Segment: 3a
9-888-462-04
Self Diagnosis
Supported model
KDL-46HX750

MODEL LIST
MODEL COMMANDER DESTINATION MODEL COMMANDER DESTINATION
9-888-462-04
KDL-40HX750 RM-YD076 LA/MX
KDL-46HX750 RM-YD073 US/CND
KDL-46HX750 RM-YD076 LA/MX
KDL-46HX751 RM-YD076 LA/MX
KDL-55HX750 RM-YD073 US/CND
KDL-55HX750 RM-YD076 LA/MX
KDL-55HX751 RM-YD073 US/CND
KDL-55HX751 RM-YD076 LA/MX

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 i
TABLE OF CONTENTS
Cautions and Warnings..................................................................................iii
Section 1 - Features and Overview ................................................................1
Features ........................................................................................................1
Specications ................................................................................................2
CheckingtheAccessories.........................................................................3
ChassisOverview..........................................................................................4
Overall Circuit Description.............................................................................6
Main Board ...............................................................................................6
Power Supply Board .................................................................................6
IR Board....................................................................................................6
3D IR Emitter Board..................................................................................7
WirelessLANCard ...................................................................................7
SwitchUnit................................................................................................7
LCD Panel Assembly ................................................................................7
Section 2 - Troubleshooting ...........................................................................8
Overview .......................................................................................................8
UpdatingtheSoftware ..............................................................................8
Self Diagnosis Function.................................................................................8
Standby LED Blink Count .........................................................................8
ViewingtheSelfCheckDiagnosisHistory................................................9
TriageChart................................................................................................. 11
Section 3 - Flow Charts and Diagrams ........................................................12
Block Diagram .............................................................................................12
NoPower ................................................................................................13
Standby LED Blinking .............................................................................15
NoPicture ...............................................................................................16
No3DViewing ........................................................................................18
Section 4 - Disassembly/Part Number Information ....................................19
Table-TopStandRemoval ...........................................................................19
Rear Cover Removal...................................................................................20
HandlingtheLVDSFFCConnector.............................................................21
DisconnectingtheLVDSFFCConnector ...............................................21
ConnectingtheLVDSFFCConnector....................................................21
MainBoard(BAPS)andPowerSupplyBoard(GL6/GL7)Removal ...........22
Panel Brackets and LCD Panel Removal....................................................23
CleaningtheLCDPanel .........................................................................23
Connectors ..................................................................................................24
Screws.........................................................................................................24
Accessories and Packaging ........................................................................25
Miscellaneous..............................................................................................25
Optional Accessories...................................................................................25
Wire Dressing..............................................................................................26
Section 5 - Updates and Adjustments .........................................................27
Overview .....................................................................................................27
SoftwareUpdatesforCustomers ................................................................27
SoftwareUpdatesforServicers...................................................................27
SoftwareUpdateResponsibility..............................................................28
CheckingtheSoftwareVersion...............................................................28
CompletingServiceRequirements
WhenReplacingtheMainBoard.................................................................28
UpdatingtheSoftware ............................................................................28
SelectingtheSegmentCode ..................................................................29
SelectingtheDestination ........................................................................31
SelectingtheModelName......................................................................32
AddingtheSerialNumber.......................................................................32
ConrmingtheModelIDandProductID ................................................34
ClearingtheSelfDiagnosisSelfCheckInformation ...............................36

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 ii
TABLE OF CONTENTS
Resolvingan8BlinkError...........................................................................37
Verifyingthereisan8xerror...................................................................37
ResettingtheTVtoFactoryCondition....................................................38
UpdatingtheSoftware ............................................................................38
ReplacingtheMainBoard ......................................................................38
CompletingServiceRequirementsWhen
ReplacingtheLCDPanelorTCONBoard .................................................39
UpdatingtheSoftware ............................................................................39
ConrmingtheModelIDandProductID ................................................39
ResettingthePanelOperationTime.......................................................40
ClearingtheSelfDiagnosisSelfCheckInformation ...............................42
OptionalAdjustments ..................................................................................42
EnablingVCOMtoAdjustthePicture .....................................................42
SettingWhiteBalanceAdjustments........................................................43
ResettingtheTVtoFactoryCondition.........................................................44
ResettingtheTVtoFactoryConditionUsingServiceMode...................44
Appendix A: Encryption Key Components ............................................... A-1

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 iii
CAUTION
Theseservicinginstructionsareforusebyqualiedservicepersonnelonly.
Toreducetheriskofelectricshock,donotperformanyservicingotherthan
thatcontainedintheoperatinginstructionsunlessyouarequaliedtodoso.
WARNING!!
Anisolationtransformershouldbeusedduringanyservicetoavoidpossible
shockhazard,incaseoflivechassis.
! SAFETY-RELATED COMPONENT WARNING!!
TherearecriticalcomponentsusedinLCDcolorTVsthatareimportantfor
safety.Thesecomponentsareidentiedwithshadingand! markonthe
schematicdiagramsandthepartslist.Itisessentialthatthesecriticalparts
bereplacedonlywiththepartnumberspeciedinthepartslisttoprevent
electricshock,re,orotherhazard.
NOTE:Donotmodifytheoriginaldesignwithoutobtainingwrittenpermission
fromthemanufactureroryouwillvoidtheoriginalpartsandlaborwarranty.
CAUTIONS AND WARNINGS
ATTENTION!!
Cesinstructionsdeservicesontàl’usagedupersonneldeservicequalié
seulement.Pourprévenirlerisquedechocélectrique,nepasfairel’entretien
autre que celui contenu dans le Mode d’emploi à moins que vous soyez
qualiéfaireainsi.
ALERTE!!
And’evitertoutrisqued’electrocutionprovenantd’unchássissoustension,
untransformateurd’isolementdoitetreutilisélorsdetoutdépannage.
!
ATTENTION AUX COMPOSANTS
RELATIFS A LA SECURITE!!
Les composants identies par une trame et par une marque ! sur les
schemasdeprincipe,lesvuesexploseesetleslistesdepiecessontd’une
importance critique pour la securite du fonctionnement. Ne les remplacer
quepardescomposantsSonydontlenumerodepieceestindiquedansle
present manuel ou dans des supplements publies par Sony. Les reglages
decircuitdontl’importanceestcritiquepourlasecuritedufonctionnement
sont identies dans le present manuel. Suivre ces procedures lors de
chaque remplacement de composants critiques, ou lorsqu’un mauvais
fonctionnement suspecte.

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 iv
CAUTIONS AND WARNINGS
SETTING UP AND CARRYING THE TV
●DisconnectallcableswhencarryingtheTV.
●CarrytheTVwiththeadequatenumberofpeople;largersizeTVsrequiretwoormorepeople.
●CorrecthandplacementwhilecarryingtheTVisveryimportantforsafetyandtoavoiddamage.
USE CAUTION WHEN HANDLING THE LCD PANEL
When repairing the LCD panel, be sure you are grounded by using a wrist band.
When installing the LCD panel on a wall, the LCD panel must be secured using the 4 mounting holes on the rear cover.
1. Donotpressonthepanelorframeedgetoavoidtheriskofelectricshock.
2. Donotscratchorpressonthepanelwithanysharpobjects.
3. Donotleavethemoduleinhightemperaturesorinareasofhighhumidityforanextendedperiodoftime.
4. DonotexposetheLCDpaneltodirectsunlight.
5. Avoidcontactwithwater.Itmaycauseashortcircuitwithinthemodule.
6. DisconnecttheACpowerwhenreplacingthebacklightorinvertercircuit.
 (Highvoltageoccursattheinvertercircuitat650Vrms.)
7. AlwayscleantheLCDpanelwithasoftclothmaterial.
8. Usecarewhenhandlingthewiresorconnectorsoftheinverter
circuit.Damagingthewiresmaycauseashort.
9. ProtectthepanelfromESDtoavoiddamagingtheelectronic
circuit(C-MOS).
10. Duringtherepair,DONOTleavethePowerOnformorethan
1hourwhiletheTVisfacedownonacloth.

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 v
CAUTIONS AND WARNINGS
CLEANING THE LCD PANEL
CAUTION:WhencleaningtheTV,besuretounplugthepowercordtoavoidanychanceofelectricshock.
Clean the cabinet of the TV with a dry soft cloth.
Wipe the LCD screen gently with a soft cloth.
;Stubbornstainsmayberemovedwithaclothslightlymoistenedwithasolutionofmildsoapandwarmwater.
;Ifusingachemicallypretreatedcloth,pleasefollowtheinstructionprovidedonthepackage.
;Neverusestrongsolventssuchasathinner,alcoholorbenzineforcleaning.
;Periodicvacuumingoftheventilationopeningsisrecommendedtoensureproperventilation.
;DoNotusepapertowels,anytypeofabrasivepad,rags,rubberorvinylmaterialstocleanthescreen.Usingthesematerialscouldeasilyscratchthe
screenwhichmayresultinpermanentdamage.
;DoNotuseanycleaningproductcontainingalkaline/acidcleaner,scouringpowder,orvolatilesolvent,suchasalcohol,ammonia,benzine,thinneror
insecticide.Usinganyoftheseharshcleanersmayresultinpermanentdamagetothescreen.
;DoNotspraywaterordetergentdirectlyontotheTVscreen.Ifliquiddripsintothebottomofthescreenitmaycauseafailure.

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 vi
CAUTIONS AND WARNINGS
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety
checksbeforereleasingthesettothecustomer:
1. Checktheareaofyourrepairforunsolderedorpoorlysoldered
connections.Checktheentireboardsurfaceforsoldersplashes
and bridges.
2. Checktheinterboardwiringtoensurethatnowiresare“pinched”or
touchinghigh-wattageresistors.
3. Checkthatallcontrolknobs,shields,covers,groundstraps,and
mountinghardwarehavebeenreplaced.Beabsolutelycertainthat
youhavereplacedalltheinsulators.
4. Lookforunauthorizedreplacementparts,particularlytransistors,
thatwereinstalledduringapreviousrepair.Pointthemouttothe
customerandrecommendtheirreplacement.
5. Lookforpartswhich,thoughfunctioning,showobvioussignsof
deterioration.Pointthemouttothecustomerandrecommendtheir
replacement.
6. Checkthelinecordsforcracksandabrasion.Recommendthe
replacementofanysuchlinecordtothecustomer.
7. Checktheantennaterminals,metaltrim,“metallized”knobs,
screws,andallotherexposedmetalpartsforACleakage.Check
leakageasdescribedin“LeakageTest”.
LEAKAGE TEST
TheACleakagefromanyexposedmetalparttoearthgroundandfromall
exposedmetalpartstoanyexposedmetalparthavingareturntochassis,
must not exceed 0.5 mA (500 microamperes). Leakage current can be
measuredbyanyoneofthreemethods.
1. A commercial leakage tester.
Followthemanufacturers’instructionsprovidedwiththetester.
2. Abattery-operatedACmilliammeter.
3. MeasuringthevoltagedropacrossaresistorbymeansofaVOM
orbattery-operatedACvoltmeter.The“limit”indicationis0.75V,so
analogmetersmusthaveanaccuratelowvoltagescale.Nearlyall
battery-operateddigitalmultimetersthathavea2VACrangeare
suitable.(seeFigureA)
To Exposed Metal
Parts on Set
0.15 µF
Earth Ground
AC
Voltmete
r
(0.75V)
FigureA.UseanACvoltmetertocheckACleakage.

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 vii
CAUTIONS AND WARNINGS
HOW TO FIND A GOOD EARTH GROUND
Thecover-plateretainingscrewonmostACoutletboxesisatearthground.
Verify theAC outlet box retaining screw ground by connecting a 60W to
100Wincandescent(notaneonoruorescentlamp)betweenthehotsideof
thereceptacleandtheretainingscrew.Trybothslots,ifnecessary,tolocate
thehotsideontheline;thelampshouldlightatnormalbrillianceifthescrew
isatgroundpotential.(seeFigureB)
FigureB.Checkingforearthground.
Trouble Light
AC Outlet Box

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 1
FEATURES
TheAZ3Fchassisisoneofseveraldesignsforthe2012modellineofSony
Bravia®LCDtelevisions.Thismanualcoversthefollowingmodels:
 KDL-40HX750
 KDL-46HX750
 KDL-46HX751
 KDL-55HX750
 KDL-55HX751
SECTION 1 - FEATURES AND OVERVIEW
TheBRAVIA®HX75xseriesLEDLCDHDTVwith3Dhaveincomparable
picturequalityandanultra-thindesign
●BrilliantFullHD(1080p)picturequalitywithDynamicEdgeLED
backlightwithFrameDimming
●X-Reality™Enginethatcreatescrispdetailineachscene
●4xHighSpeed3DPanelwithMotionow™XR480
●DynamicEdgeLEDbacklightforamazingcontrast&color
●One-touchaccesstotheSonyEntertainmentNetwork™andapps1
●3DinFullHD1080pforphenomenal3Dpicturequality2
●StreamHDentertainmentwirelesslywithbuilt-inWi-Fi®1
●Skype™ready1
●PC and tablet content3on your TV w/ Intelligent Connect
●MediaRemote™apptocontrolyourTVwithasmartphone4
●Built-inWi-Fi™(802.11n)enablesyoutoconnecttotheTVvia
Wi-Fi®withoutusingarouter3
1. Broadbandspeedofatleast2.5Mbpsrecommended(10MbpsforHD).Contentsubject
tochangeandmayrequirefees.SkyperequiresCMU-BR100camerasoldsep.Subjectto
Skype’s terms and conditions.
2. Requires3Dcontent,3Dplayer,HDMI®cable(atleast10.2Gbps)and3Dactiveglasses
sold separately.
3. Streamingcontent,copy-protectedcontentandcertainformatsarenotsupported.
4. Requiresdevicesconnectedtothesamewirelesshomenetwork.

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 2
SECTION 1 - FEATURES AND OVERVIEW
SPECIFICATIONS
System
Television system NTSC: American TV standard
ATSC (8VSB terrestrial): ATSC compliant 8VSB
QAM on cable: ANSI/SCTE 07 2000 (Does not include CableCARD functionality)
Channel coverage
Analog Cable: 1 - 135 / Digital Cable: 1 - 135
Panel system
Speaker output
Input/Output jacks
CABLE/ANTENNA 75-ohm external terminal for RF inputs
VIDEO IN 1 Video / Audio input (phono jacks)
COMPONENT IN
VIDEO IN 2
YP BPR(Component Video): 1080p (60 Hz), 1080i (60 Hz), 720p (60 Hz), 480p, 480i
Audio input (phono jacks)
Video input (common phono pin with Y input)
HDMI IN 1/2/3/4 Video (2D): 1080p (30, 60 Hz), 1080/24p, 1080i (60 Hz), 720p (30, 60 Hz), 720/24p,
480p, 480i, PC Formats
Video (3D):
Frame Packing 1080p (30 Hz), 1080/24p, 1080i (60 Hz), 720p (30, 60 Hz), 720/24p
Side-by-Side 1080p (60 Hz), 1080/24p, 1080i (60 Hz), 720p (60 Hz)
Over-Under 1080p (30, 60 Hz), 1080/24p, 1080i (60 Hz), 720p (60 Hz)
Audio: Two channel linear PCM: 32, 44.1 and 48 kHz, 16, 20 and 24 bits, Dolby Digital
Analog audio input (stereo mini jack) (HDMI IN 2 only, common with PC IN)
ARC (Audio Return Channel) (HDMI IN 1 only)
AUDIO OUT/Headphones
DIGITAL AUDIO OUT
(OPTICAL)
Digital optical jack (Two channel linear PCM, Dolby Digital)
PC IN
PC/HDMI 2 AUDIO IN
Analog RGB (Mini D-sub 15-pin)
Audio input (stereo mini jack) (common with HDMI IN 2)
ehtnognidnepedreffidyamdeepsnoitcennoC(rotcennocXT-ESAB001/T-ESAB01NAL
network environment. 10BASE-T/100BASE-TX communication rate and
communication quality are not guaranteed for this TV.)
.tamrofdetroppusroflaunaM-iehtotrefeRANLD/BSU
Analog terrestrial: 2 - 69 / Digital terrestrial: 2 - 69
LCD (Liquid Crystal Display) Panel
10 W + 10 W
Stereo mini jack

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 3
SECTION 1 - FEATURES AND OVERVIEW
*Download Acquisition Mode (DAM) is used for software updates and/or collecting data for Rovi On Screen Guide.
•Optional accessories availability depends on countries/region/TV model/stock.
•Design and specications are subject to change without notice.
Optional accessories Connecting cables
Support Belt Kit
Wall-Mount Bracket: SU-WL500
3D Glasses: TDG-BR750/TDG-BR250/TDG-BR200/TDG-BR100/TDG-BR50
Camera and Microphone Unit: CMU-BR100
USB Wireless LAN Adapter: UWA-BR100
Operating temperature 32 ºF – 104 ºF (0 ºC – 40 ºC)
W 801
40 inches
943 × 613 × 232
943 × 576 × 59
3 / 31.5.41
8 / 26.0.11
Model name KDL- 55HX750
55HX751
46HX750
46HX751
Power and others
Power requirement 110-240 V AC, 50/60 Hz (U.S.A./Canada 120 V AC, 60 Hz)
Power
consumption
W 231W 141esu ni
in DAM* 0.02 kWh/Day
(You may hear a clicking noise during the download but this is normal.)
in standbyLess than 0.15 W with 120 V AC and less than 0.3 W with 240 V AC
Screen size
(inches measured diagonally)
54.6 inches
(55 class)
46 inches
Display resolution 1,920 dots (horizontal) × 1,080 lines (vertical)
Dimensions with stand (mm)
(inches)
1,271 × 798 × 312
50 1/8 × 31 1/2 × 12 3/8
1,076 × 687 × 252
42 3/8 × 27 1/8 × 10
without stand
(mm)
(inches)
1,271 × 761 × 60
50 1/8 × 30 × 2 3/8
1,076 × 650 × 60
42 3/8 × 25 5/8 × 2 3/8
wall-mount hole
pattern (mm)300 × 300
wall-mount screw
size (mm)
M6 (length: see Operating Instructions manual.)
Mass with stand
(kg)/(lb.) 8.83 / 6.710.25 / 6.32
without stand
(kg)/(lb.) 2.23 / 6.413.24 / 2.91
Supplied accessories See Checking the accessories.
40HX750 CHECKING THE ACCESSORIES
Remote control (1)*1
Size AAA batteries (2)
Table-Top Stand (1)*2
Fixing screws for Table-Top Stand
(M5 × 16) (3)
Assembling screws for Table-Top Stand
(M5 x 16) (4)
3D Glasses (battery included) (2)
(KDL-46HX751/55HX751 only)
Pouch for 3D Glasses (2)
(KDL-46HX751/55HX751 only)
Operating Instructions (this manual) and
other documents
*1Please refer to the model name printed on the
remote control.
*2Assembling the Table-Top Stand is required.
Refer to the supplied Table-Top Stand leaet to
assemble the Table-Top Stand.

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 4
SECTION 1 - FEATURES AND OVERVIEW
CHASSIS OVERVIEW
TheprimarycircuitsintheAZ3FchassisconsistofaMainBoard(BAPSBoard),PowerSupplyBoard(GL6Boardforthe40”and46”models,andGL7Board
forthe55”models),theIRBoard(HLBoard),the3DIREmitter(HEM3Board),theWirelessLANCard,theSwitchUnit,andtheLCDPanelassemblywhich
includestheTCONBoard.
NOTE:Forconnectorpartnumberinformation,referto“Connectors”onpage24. For Wire Dressing information, refer to “WireDressing”onpage26.
SWITCH
UNIT
HLHEM3
TCON
GL6
BAPS
WIRELESS
LAN CARD
BOARD LAYOUT FOR KDL-40HX750 ONLY

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 5
SECTION 1 - FEATURES AND OVERVIEW
SWITCH
UNIT
HLHEM3
TCON
GL6
BAPS
WIRELESS
LAN CARD
BOARD LAYOUT FOR KDL-46HX750/46HX751 ONLY
SWITCH
UNIT
HLHEM3
TCON
WIRELESS
LAN CARD
GL7
BAPS
BOARD LAYOUT FOR KDL-55HX750/55HX751 ONLY

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 6
SECTION 1 - FEATURES AND OVERVIEW
OVERALL CIRCUIT DESCRIPTION
“Overall Block Diagram” on page 12 provides an overview of theAZ3F
chassis.Thefollowingaredescriptionsoftheboardsandtheirfunctions.
MAIN BOARD
Commontoall modelsthe MainBoard, designated asthe BAPSBoard,
contains the TV control, video, and audio processing circuitry.All these
functionsareaccomplishedusingtheX-RealityProcessorIC9000.
TUNER
The tuner is a combination ATSC/NTSC unit. It can receive traditional
analogNTSCsignalsviacableorterrestrialalongwithATSCdigitalsignals
viaterrestrial(8VSB)orcable(64or256QAM).
X-REALITY PROCESSOR
IC9000performsthemajorityofthenecessaryaudioandvideoprocessing
ontheMainBoard.
TV Microprocessor: TheCPUinternaltotheX-Realityprocessorcontrols
all aspects of the television functions. Input from the user along with
monitoringofcriticalcircuitsisalsoperformedbythisCPU.
Digital Audio and Video Decoder: TheMPEG2andDigitalDolbyaudio
streamsarereceivedfromthetunerfordecompression.Allvideosources
which are not native 1920 X 1080p 60HZ are scaled to this resolution.
DigitalaudiocontentisoutputtotheclassDamplierforprocessingand
amplication.
HDMI Input and Switching:ThecustomercanselecttheHDMI1,HDMI2,
HDMI3,HDMI4inputviatheHDMIswitchIC5500.EachHDMIinputcontains
acommonEDINVM(internaltoIC5500)toprovidedisplayinformationdata
toanydeviceconnectedviatheHDMIinputs.
LVDS Transmitter: Integrated into IC9000 is a Low Voltage Differential
Signaling (LVDS) transmitter. This circuit converts the 8-bit parallel RGB
video information into a set of high speed serial lines for noise-free
transmissiontotheTCONBoardcircuitslocatedinternallytotheLCDPanel.
Scan Converter: Signal processing circuit that performs resolution
conversion(aspectratio)andinterlacedtoprogressivescan(IP)conversion.
AUDIO AMPLIFIER
The main speaker audio amplier (IC4601) and sub-woofer amplier
(IC4701)ampliesthedigitalaudiooutputoftheX-Realityprocessorand
sendsittothespeakers.
TEMPERATURE SENSOR
Thetemperaturesensordetectsover-temperatureconditionsontheMain
Board,LCDPanel,orambientroomtemperatureandsendstheshutdown
signaltotheprocessor.
POWER SUPPLY BOARD
TherearedifferentPowerSupplyBoardsusedinthemodelsinthismanual.
ThetypeofboarddependsonthesizeofLCDpanel.Theyare:
●GL6Board(40”&46”)
●GL7Board(55”)
Thereare3distinctsectionsonthepowersupply:
Standby Supply: Continuously operational as long as AC power is applied,
thestandbysupplygenerates3.3Vforthecircuitsrequiringpowerwhilethe
unitisturnedoff.Anunregulated19Vlineispresenttoprovidepowertothe
mainrelay,PFCandmainpowersupplyatturn-on.
Main Supply: Oncethepowersupplyreceivesapower-oncommandfrom
the CPU on the Main Board, the main switching supply is turned on to
provide a regulated 12V source and Audio 12V.
Converter: GeneratestheB+andB-voltagesfortheLEDbacklights.
IR BOARD
DesignatedastheHLBoard,theIRBoardcontainsthepower,standby,and
timerLED’sthatarelocatedonthisboardalongwiththeIRremotereceiver
andlightlevelsensor.

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 7
SECTION 1 - FEATURES AND OVERVIEW
3D IR EMITTER BOARD
DesignatedastheHEM3Board,thisboardistheinternal3DIREmitterto
synchronizethe3Dshutterglasses.
WIRELESS LAN CARD
The wireless transmit/receive circuits are located on this board to
communicatewithawirelessnetwork.
SWITCH UNIT
Thisboardcontainsthe power,channeland volumeup/down, andmenu
buttons.
LCD PANEL ASSEMBLY
TheLCDPanelAssemblyincludestheLCDPanel,TCONBoard,andLED
Backlightsystem.
The LCD Panel contains the actual liquid crystals, color lters, and
polarizers. The liquid crystals are manipulated by the applied voltage to
passaspecicamountoflight-fromthebacklite-dependingonthelevel
of voltage applied.
TheTCONperformsallthecontrol,timing,charge,anddischargefunctions
drivingtheoperationoftheLCDPanel.
AnewLCDPanelassemblyfrompartswillincludethefollowingitems.
●LCD Panel
●TCONBoard
●LEDBacklightingComponents(varies)
TCON BOARD
The TCON Board communicates between the LCD Panel and the
microprocessorontheMainBoard.
NOTE: The TCON Board is not available as a replacement part for all
models. To determine if the TCON Board is available as a replacement
part,refertotheLCDPanelsManual.

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 8
OVERVIEW
ThischapterprovidesinformationregardingtheSelfDiagnosisfeaturein
our TVs.
UPDATING THE SOFTWARE
TheSelf Diagnosisfunction isdesigned toprovideinformationregarding
the problem with the TV, however, there are several issues that may be
resolvedbyupdatingtheTVsoftwaretothelatestversion.Alwayscheck
the Sony Authorized Servicer Portal at http://www.sony.com/asp for any
issues that are software related. Most symptoms that are correctable by
software updates involve communications issues with other devices or
minorglitchesintheoperationofaspecicfunction.Belowisalistofsome
ofthesymptomsthatmaybecorrectedwithasoftwareupdate:
●Fluctuationsinpicturebrightness
●Intermittentpicturefreezingornoise
●Problemswithcertaininputs(especiallyHDMI)
●Intermittent or distorted audio
●Erratic remote control operation
●TV turns on and off by itself
●Loss of color
●Internet connectivity
●Certain features not working correctly
(photoorvideoleviewing)
SECTION 2 - TROUBLESHOOTING
Self Diagnosis
Supported model
SELF DIAGNOSIS FUNCTION
Criticalvoltages andcircuitoperations aremonitoredby theCPUon the
MainBoard.IfanerrorisdetectedtheSelfDiagnosisfunctionintheTVwill
forcetheTVtoshutdownbytheCPU.Themonitoredcircuitinwhichthe
faultoccurredwillautomaticallycausetheCPUtoblinktheStandbyLED
ingroupsofrepeatingsequences.ThenumberoftimestheStandbyLED
blinksindicatesthepossiblecauseoftheproblem.
Notalloftheavailableprotectcodesareusedineverymodel.Forexample,
modelsthatdon’thavethelocaldimmingfeaturedonotusethe4Xblink
errorasthiscircuitisfoundinmodelsthatarebacklitwithuorescentlamps.
Theinformationinthissectionprovidesguidanceinlocatingthepossible
componentcausingtheshutdown.
STANDBY LED BLINK COUNT
Standby LED
2 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec. LED OFF
3 sec.
LED DISPLAY & BLINK COUNT

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 9
SECTION 2 - TROUBLESHOOTING
VIEWING THE SELF CHECK DIAGNOSIS HISTORY
Whenanerrorisdetected,theSelfCheckscreenrecordsthedate(s)and
thenumberoftimestheerroroccurred.Thisishelpfulinconrmingpast
occurrencesofanerror,andfordeterminingifanerrorisintermittentwhen
thecustomerisnotsurewhatiscausingthetelevisiontoshutdown.Ifthe
screendisplaysa“0”,noerrorhasoccurred.
1. TaketheTVoutofdeepStandbymodebypressing
POWER
to
turnontheTV.
2. Press
POWER
toturntheTVbackoff.
3. PressthefollowingbuttonsontheRemoteCommanderwithina
secondofeachother:
DISPLAY
Channel
5
Volume
-
POWER
*NOTE:ThisdiffersfromaccessingServiceAdjustmentsMode
(Volume+)
SELF CHECK
000 RESERVED --------------------- ------------------------------------------ 00
000 RESERVED --------------------- ------------------------------------------ 00
002MAIN_POWE --------------------- ------------------------------------------ 00
003 DC_ALERT --------------------- ------------------------------------------ 00
003 AUD_PROT --------------------- --------------------- ---------------------00
003 HDMI_EQ --------------------- --------------------- --------------------- 00
003 TU_DEMOD --------------------- ------------------------------------------ 00
004 VLED --------------------- ------------------------------------------00
004 LD_ERR --------------------- --------------------- ---------------------00
005 HFR_ERR --------------------- --------------------- ---------------------00
005 TCON_ERR120123132522 120123113645--------------------- 02
005 P_ID-ERR --------------------- --------------------- --------------------- 00
006 BACKLITE --------------------- ------------------------------------------00
007 TEMP_ERR --------------------- ------------------------------------------ 00
007 FAN_ERR --------------------- ------------------------------------------ 00
010 EMITTER --------------------- --------------------- ---------------------00
101 VPC_WDT --------------------- ------------------------------------------ 00
102 MEPS_WDT--------------------- ------------------------------------------ 00
103 HOST_WDT --------------------- ------------------------------------------00
104 STBY_WDT --------------------- ------------------------------------------ 00
00345 000333 06789
Total operation time by hour (MAX:65535)
Boot count (MAX:65535)
Panel operation time by hour (MAX:65535)
Total operation time by hour (MAX:65535)
Boot count (MAX:65535)
Panel operation time by hour (MAX:65535)
StandBy LED
Blink Count
Diagnosis
Item
Date and Time Display*
Error Count
(00-99)
*Format of Error History = YYMMDDhhmmss example 120123132522= Jan 23, 2012 13:25:22 (1:25:22PM)
NOTE: date and time must be set for this to work
SAMPLE SELF CHECK DIAGNOSIS PAGE

KDL-40HX750/46HX750/46HX751/55HX750/55HX751 10
SECTION 2 - TROUBLESHOOTING
2X Blink - Main Power Error
AlossofREG12Vfromthepowersupplytriggersthisprotectevent.The
usualcauseisafailureofthemainswitchingsupply.Insomeinstances,
excessiveloadingonthesecondarysupplylinescancausetheswitching
regulator to stop, or fail again, if a replacement board is installed.
3X Blink- DC Regulator/Audio Error/HDMI/Tuner
Severalitemsaremonitoredonthemainboard.Anyerrordetectedinthe
followingcircuitswillcausethetelevisiontoshutdownandgeneratea3X
error:
●LossofregulatedB+circuits
●Audioamplierfailure
●HDMIequalizerIC
●Tuner demodulator circuits
Inmostcases,replacementofthemainboardwillremedya3Xerror.
4X Blink – Balancer Error
NOTUSEDINTHISMODELSERIES
5X Blink - TCON Error
The5Xblinkprotection modeindicates acommunications errorbetween
theTCONBoardandtheX-RealitymicroprocessorontheMainBoard.If
theTCONisavailableforreplacement,replacetheTCON.IftheTCONis
notavailable,theLCDpanelmustbereplaced sincetheTCONcircuitis
partoftheLCDpanelassembly.InrarecasesalooseordefectiveLVDS
cablecouldalsobethecause.
6X Blink - Converter System Failure
AnopenLEDinthebacklightstringswillcauseanover-voltagecondition
in the converter circuits. The symptom will be a momentary appearance
of the backlights (Sony logo may appear) followed by a 6X shutdown.
ReplacementoftheLCDpanelisrequiredtoremedythiscondition.
Iftheconverter failstogeneratevoltage fortheLEDbacklights, thelow-
voltageprotectioncircuitsareactivatedandthetelevisionwillshutdown
witha6Xerror.ReplacementofthePowerSupplyBoardshouldremedy
thiscondition.
7X Blink - Temperature Failure
Ifthetemperatureinsidethetelevisionbecomesexcessive,thetemperature
sensor(locatedontheMainBoard)notiestheTVtoshutdownanddisplay
a7Xerror. Excessive temperatureerrors will alwaysoccur whentheTV
hasbeenrunningawhileandcanbecausedbyexcessiveambientheator
improperventilationofthetelevision.
Ifthetelevisionshutsdownimmediately,thiscanbecausedbyadefective
temperaturesensingICorfailureofthecommunicationsbusbetweenthe
ICandthemicroprocessor.ReplacementoftheMainBoardisnecessary.
8X Blink – Not listed in Self Check
The8XblinkcodeismainlyusedduringTVsoftwaredevelopment.Lookin
TV’sserviceSelfCheckforerrorcodehistoryandnoticeatthebottomof
thelistWDT(WatchDogTimer)errorcodes,inparticularnotice103HOST_
WDT.Ifthiserrorcodeappears,checkforanyadditionaldocumentationon
theSonyESIsite.
10X Blink – IR Sync Transmitter Failure
A failure of the infrared sync transmitter circuits on the HEM3 board will
cause a 10X error and replacement of this board will usually rectify the
problem.Inrarecases,theMainBoardcouldbethesourceofthefailure.