Panasonic PT47X54J - 47" PROJECTION TV Manual de usuario

MTNC040522A1

B19

HDTVMONITOR

PT-47X54J / PT-53TW54J

GN1P

Thissimplifiedservice manual isissuedtoadd listedmodel tothe

mainservice manual orderNo. MTNC040520C1(PT-53X54J). Aparts

list and schematics areincludedinthissimplifiedservice manual.

Please fileand use thissimplifiedservice manualtogetherwiththe

mainservice manual orderNo. MTNC040520C1(PT-53X54J).

1. Safetyprecautions

General guidelines

Anisolation transformershouldalways beusedduring theservicing ofareceiverwhose chassis

isnotisolatedfrom ACpowerline. Use atransformerofadequatepowerrating as thisprotects

thetechnicianfrom accidentsresulting inpersonal injuryfrom electrical shocks. Itwill also

protectthereceiverfrom being damagedbyaccidental shorting thatmay occur during servicing.

Whenservicing, observe theoriginal leaddress, especiallyinthehigh voltagecircuit. Replace all

damagedparts(alsopartsthatshowsignsofoverheating.)

Always replace protective devices, suchas fishpaper, isolation resistorsand capacitors, and

shieldsafterservicing thereceiver. Use onlymanufacturer’srecommendedrating for fuses,

circuitsbreakers, etc.

High potentialsarepresentwhenthisreceiverisoperating. Operation ofthereceiverwithoutthe

rearcoverintroduces dangerfor electrical shock. Servicing shouldnotbeperformedbyanyone

who isnotthoroughlyfamiliarwiththenecessaryprecautionswhenservicing high voltage

equipment.

Extremecareshouldbepracticedwhenhandling thepicturetube. Rough handling may cause it

toimplodeduetoatmosphericpressure. (14.7lbspersq. in.). Donotnick or scratchtheglass or

subjectittoanyunduepressure. Whenhandling, usesafetygoggles and heavy gloves for

protection. Dischargethepicturetubebyshorting theanodetochassisground (nottothe

cabinetor toothermounting hardware). Whendischarging connectcoldground (i.e. dagground

lead)totheanodewithawellinsulatedwireor use agrounding probe.Avoidprolongedexposure

atclose rangetounshieldedareas ofthepicturetubetopreventexposuretoxray radiation.

Thetestpicturetubeusedfor servicing thechassisatthebenchshouldincorporatesafetyglass

and magneticshielding. Thesafetyglass provideshielding for thetubeviewing area againstx

ray radiation as well as implosion. Themagneticshieldlimitsthexray radiation around thebell of

thepicturetubeinaddition totherestricting magneticeffects. Whenusing apicturetubetestjig

for service, ensurethatthejigiscapableofhandling 50kV withoutcausing xray radiation.

Beforereturning aservicedreceivertotheowner, theservice technicianmustthoroughlytest

theunittoensurethatiscompletelysafetooperate. Donotuse alineisolation transformerwhen

testing.

Leakagecurrentcoldcheck

Unplug theA.C. cord and connectajumperbetweenthetwoplug prongs.Measuretheresistance

betweenthejumperedACplug and expose metallicpartssuchas screwheads, antenna

terminals, control shafts, etc. Iftheexposedmetallicparthas areturnpathtothechassis, the

reading shouldbebetween240k and 5.2M . Iftheexposedmetallicpartdoes nothave a

return pathtothechassis, thereading shouldbeinfinite.

Leakagecurrenthotcheck

Plug theACcord directlyintotheACoutlet. Donotuse anisolation transformerduring thecheck.

Connecta1.5k 10 watt resistor inparallel witha0.15 Fcapacitor betweenanexposed

metallicpartand ground. Use earthground, for exampleawaterpipe.

Using aDVMwitha1000 ohms/voltsensitivityor higher, measuretheACpotential across the

resistor.

Repeattheprocedureand measurethevoltagepresentwithall otherexposedmetallicparts.

Verifythatanypotential does notexceed0.75 voltRMS. Aleakagecurrenttester(sucha

Simpson model 229, Sencoremodel PR57 or equivalent) may beusedintheabove procedure, in

whichcase anycurrentmeasuremustnotexceed0.5milliampere.Ifanymeasurementisoutof

thespecifiedlimits, thereisapossibilityofashock hazard and thereceivermustberepairedand

recheckedbeforeitisreturnedtothecustomer.

Hotcheck circuit

Insulation test

Connectaninsulation testerbetweenanexposedmetallicpartand A.C. line. Apply1080VAC/

60Hzfor 1second. Confirm thatthecurrentmeasurementis0.5mA~2.0mA. Repeattestwith

othermetallicexposedparts.

X-ray radiation

WARNING

Thepotential source ofx-ray radiation inthePTV setisinthehigh voltagesection and the

picturetube.

NOTE

Itisimportanttouse anaccurate, calibratedhigh voltagemeter.

Applyall black videosignals(1080i)and confirm high voltagemeasures 31.5±1.0kV. Ifthehigh

voltageisnotwithintherange, changeC514 (inD-Board)to1800pF, 2000pF, 2400pF or 2700pF

until thedesiredvalueisobtained.ApplyNTSCwhitepattern and confirm thehigh voltage

measures 30.1±1.5kV. ApplyHD 1080i whitepattern and confirm thehigh voltagemeasures 30.1

±1.5kV.

2. About lead free solder(PbF)

NOTE

Leadislistedas (Pb)intheperiodictableofelements. / Intheinformation below, Pbwill referto

leadsolder, and PbF will refertoLeadFree Solder. / Theleadfree solderusedinour

manufacturing process and discussedbelowis(Sn+Ag+Cu). / ThatisTin(Sn), Silver(Ag)and

Copper(Cu)although othertypes areavailable.

Thismodel uses PbFree solderinit’smanufactureduetoenvironmental conservation issues. For

/ service and repairwork, we’dsuggesttheuse ofPbfree solderas well, although Pbsoldermay

be/ used. / PCBsmanufacturedusing leadfree solderwill have the“PbF”or aleafsymbol

stampedon the/ back ofPCB.

CAUTION

-Pbfree solderhas ahighermelting pointthanstandardsolder.

Typicallythemelting pointis50 ~70 °F(30 ~40 °C)higher. Please

use ahigh temperaturesoldering iron and set itto700 ±20 °F(370

±10 °C).

-Pbfree solderwill tend tosplashwhenheatedtoo high (about1100

°For600 °C). / Ifyou must use Pbsolder, please completely

removeall ofthePbfree solderon thepinsorsolderarea before

applying Pbsolder. Ifthisisnotpractical, besuretoheat thePb

free solderuntil itmelts, beforeapplying Pbsolder.

-Afterapplying PbF soldertodoublelayeredboards, please check

thecomponentsideforexcess solderwhichmayflow ontothe

opposite side.

SuggestedPbfree solder

Thereareseveral kindsofPbfree solderavailablefor purchase. Thisproductuses Sn+Ag+Cu

(tin, silver, copper)solder. However, Sn+Cu(tin, copper), Sn+Zn+Bi (tin, zinc, bismuth)soldercan

alsobeused.

3. Important safetytests

Measuring H.V.

TheanodecapsarecementedtotheCRTs. Togainaccess for high voltagemeasurement,

remove theredCRT’sanodeleadfrom theflyback transformerdistributor. Grasptheanodelead

protective capatitsbottom and squeezeitagainstthelocking capbodyinside, rotate1/4turn

counterclockwise and pull theanodeleadsleeve outoftheFBTdistributor. Connectahigh

voltagepositive leadfrom your H.V. metertotheFBTdistributor, and thecommon negative lead

tocoldground

FBTleadsremoval

Note:

ReinserttheanodeleadintotheFBTdistributor until itistightlyand fullyseated. Turn the

locking capclockwise tolock inplace.

(EHT)Protector operation check

Withthecabinetback removed, applyanominal 120V A.C. tothePTV.

Overvoltagetest

Preparation:

1. TurnPTV“OFF”

2. Connect aNTSCsignal generatortotheantennaterminal.

3. Connect DVMpositiveleadtoD31 pin2and negativeleadtoD31

pin1on D-Board H.V. measurement

4. Connect aH.V. meter(statictype, class 0.1) withhigh voltage

leadstohigh voltagedistributoron FBT.

DVMand powersupplyconnection

5. Connect the15 ~25 VDC variablepowersupplypositiveleadto

D34 orIC802 pin2(DBoard)and negativeleadtoheat sinkof

Q551 orD825

Procedures:

1. ApplyaNTSCwhite pattern.

2. TurnPTVON.

3. Adjust thepictureorbrightness controlssothat theDVMreads

12.7±0.4volts.

4. Increase thevariablepowersupplyuntil set turnsoff. Theset

shouldturnoff at 12.7±0.4volts (DVM)and high voltageless than

36.4kV.

5. IftheDVMreading isotherthan12.7±0.4volts, readjust pictureor

brightness control and repeat steps3.

6. Turnoff thevariablesupplyand confirm that theset will turnon by

pulling outACplug socket and connecting itagain.

4. Service notes

NOTE

These componentsareaffixedwithglue. Becareful nottobreak or damageanyfoil underthe

componentor atthepinsoftheICswhenremoving. Usuallyapplying heattothecomponentfor a

shorttimewhiletwisting withtweezerswill break thecomponentloose.

Leadless chipcomponent(surface mount)

Chipcomponentsmustbereplacedwithidentical chipsduetocritical foil track spacing. There

areno holes intheboard tomountstandard transistorsor diodes. Somechipscapacitor or

resistor board solderpadsmay have holes through theboard,howevertheholediameterlimits

standard resistor replacementto1/8watt. Standard capacitor may alsobelimitedfor thesame

reason. Itisrecommendedthatidentical componentsbeused.

Chipresistor have athree digitnumerical resistance code, 1stand 2nd significantdigitsand a

multiplier. Example:162 =1600 or 1.6k resistor, 0=0 (jumper).

Chipcapacitorsgenerallydo nothave thevalueindicatedon thecapacitor. Thecolor ofthe

componentindicates thegeneral rangeofthecapacitance.

Chiptransistorsareidentifiedbyatwolettercode. Thefirstletterindicates thetypeand the

second letter, thegradeoftransistor.

Chipdiodes have atwoletteridentification codeas perthecodechartand areadual diodepack

witheithercommon anodeor common cathode. Check thepartslistfor correctdiodenumber.

Componentremoval

1. Use solderwick toremovesolderfromcomponentend capsor

terminal.

2. Withoutpulling up, carefullytwist thecomponentwithtweezersto

break theadhesive.

3. Donotreuse removedleadless orchipcomponents since theyare

subject tostress fractureduring removal.

Chipcomponentinstallation

1. Putasmall amountofsolderon theboardsoldering pads.

2. Holdthechipcomponentagainst thesoldering padswithtweezers

orwithaminiaturealligatorclipand applyheat tothepadarea

witha30 watt iron until solderflows. Donotapplyheat formore

than3seconds.

Howtoreplace flatic(requiredtools)

1. Removethesolderfromall ofthepinsofaFlat ICbyusing a

desolderbraid

2. Puttheiron wireunderthepinsoftheFlat ICand pull itinthe

direction indicatedwhileheating thepinsusing asoldering iron. A

small awl canbeusedinsteadoftheiron wire.

3. Removethesolderfromall thepadsoftheFlat ICbyusing ade

solderbraid

4. Position thenew Flat ICinplace (applythepinsoftheFlat ICto

thesoldering padswherethepinsneedtobesoldered). Properly

determinethepositionsofthesoldering padsand pinsby

correctlyaligning thepolaritysymbol

5. Solderall pinstothesoldering padsusing afinetippedsoldering

iron

6. Check withamagnifierforsolderbridgebetweenthepinsorfor

dryjointbetweenpinsand soldering pads. To removeasolder

bridge, use adesolderbraidas showninthefigurebelow

IMPORTANT

To protect against possibledamagetothesolidstate devices dueto

arcing orstaticdischarge, make certainthat all ground wires are

securelyconnected

CAUTION

Thepowersupplycircuitisaboveearthground and thechassis

cannotbepolarized. Use anisolation transformerwhenservicing

thereceivertoavoiddamagetothetest equipmentortothe

chassis. Connect thetest equipmenttotheproperground(HOTor

COLD)whenservicing, orincorrect voltages will bemeasured.

WARNING

Thisreceiverhas beendesignedtomeet orexceedapplicablesafety

and x-rayradiation protection as specifiedbygovernmentagencies

and independenttesting laboratories.

To maintainoriginal product safetydesign standardsrelativetox-

rayradiation and shock and firehazard, parts indicatedwiththe

symbol on theschematicmust bereplacedwithidentical parts.

Orderparts fromthemanufacturer’sparts centerusing theparts

numbersshowninthisservice manual, orprovidethechassis

numberand thepartreference number.

Foroptimumperformance and reliability, all otherparts shouldbe

replacedwithcomponents ofidentical specification.

5. PTVLocation of controls

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