Skyworth 1418 User manual

SKYWORTH®
SERVICEMANUAL
COLOUR TELEVISIONPAL/SECAMBG/DK /NTSC
PLAYBACK
CHASSIS: 3N10,4N10
MODEL: 1418, 1498, 1422, 2122,
2199, 21F1, L21, D21
CHASSIS : 5N10
MODEL:2522, 2588,25F1,2998,
2922
2929,29F1,3423, 3498,
3898,
L25, D25, L29,D29, L34,
D34
3N/ 5N10 7-2-2001
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CONTENTS
PAGE
X-Ray RADIATIONPRECAUTION
……………………………………………………………………………………….
2
SAFETYPRECAUTION
……………………………………………………………………………………………….…..
2
PRODUCTSAFETYNOTICE
……………………………………………………………………………………………..
2
CHASSIS
ADJUSTMENT………………………………………………………………………………………
3
COMPLETEMACHINEGENERAL
ADJUSTMENT…………………………………………………………………….
3-5
NOTES………………………………………………………………………………………………
…………………………….
5-9
COLOUR PURITYAND CONVERGENCEADJUSTMENT
………………………………...…………………………
10
BLOCK DIAGRAM
…………………………………………………………………………………………………………
11
WIREDIAGRAM
…………………………………………………………………………………………………………
12
SCHEMATIC
DIAGRAM……………………………………………………………………………………………
SPECIFICATIONS………………………………………………………………….………………
………………..……
1
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CAUTION
Beforeserving thechassis,readthe"X-Ray Radiation Precaution","SafetyPrecaution"
and "ProductSafetyNotice"on page2ofthismanual.
X-RAYRADIATIONPRECAUTION
1.Excessivehighvoltagecan producepotentiallyhazardousX-RayRadiation.Toavoidsuch
hazards,thehighvoltagemustnotbeabovethe specified limit. The normalvalue ofthe high
voltageofthisreceiveris24KV atzerobeamcurrent(minimumbrightness)under220VAC
powersource. The highvoltagemust not, underanycircumstances, exceed 29KV.
2.Eachtimeareceiverrequiresservicing,the highvoltageshouldbechecked followingthe
HighVoltageCheck procedureinthismanual.It isrecommended thereadingofthe high
voltageberecorded asapartofthe servicerecord.It isimportanttouseanaccurateand
reliablehighvoltagemeter.
3.TheprimarysourceofX-RayRadiation inthisTVReceiveristhe picturetube.Forcontinued
X-RayRadiationprotection,the replacementtubemustbeexactlythe sametypetubeas
specified inthe part list.
4.Somepartsinthisreceiverhavespecialsafety–relatedcharacteristics forX-RayRadiation
protection.Forcontinued safety,partsreplacementshouldbeundertakenonlyafterreferring
totheProductSafetyNotice.
SAFETYPRECAUTION
Warning:Serviceshouldnotbeattempted byanyone unfamiliarwithnecessaryprecautionon
thisreceiver.The followingarethe necessaryprecautionsobserved beforeservicingthis
chassis.
1.Sincethepowersupplycircuitofthisreceiverisdirectlyconnectedtothe ACpowerline,an
isolation transformershouldbeused duringanydynamicservicetoavoidpossibleshock
hazard.
2.Alwaysdischargethe picturetubeanode totheCRTconductivecoatingbeforehandlingthe
picturetube.The picturetubeishighlyevacuated and ifbroken,glass fragmentwillbe
violentlyexpelled.Useshatterproofgogglesand keeppicturetubeawayfromthe
unprotected bodywhilehandling.
3.When replacingachassisinthe cabinet, alwaysbecertainthatall the protectivedevicesare
putback inplace,suchas:non-metalliccontrolknobs,insulatingcovers,shields,isolation
resistor-capacitornetworketc.
4.When replacingpartsorcircuitboards, disconnect the powercord.
5.When replacingahighwattageresistor(Metaloxide filmresistor) on circuitboard,keepthe
resistor10mm (1/2in.)awayfromcircuit board.
6.Connection wiresmust bekept awayfromcomponentswithhighvoltageorhightemperature.
7.IfanyfuseinthisTVreceiverisblown,replaceitwiththe FUSE specified inthe chassispart
list.
8.Thereceiverisdesigned tooperatewith220V(50/60Hz)ACmains.
PRODUCTSAFETYNOTICE
Manyelectricaland mechanicalpartsinthischassishavespecialsafety-related characteristics.
Thesecharacteristics areoften passed unnoticed byavisualinspection and the X-Ray
Radiation protection afforded bythemcannotnecessarilybeobtained byusingreplacement
componentsrated forhighwattage,etc.Replaced partswhichhavethesespecialsafety
characteristics areidentified inthismanualanditssupplements,electricalcomponentshaving
suchfeaturesareshadedontheschematicdiagramand the part list.
Beforereplacinganyof thesecomponents,read the partlistinthismanualcarefully.The useof
substitutereplacementparts,whichdo nothavethesamesafetycharacteristics,asspecified in
the part list maycreateshock, fire, and X-RayRadiation orotherhazards.
2
CHASSISADJUSTMENT
1. B+voltageadjustment (For3Nand 4Nchassisonly)
1-1Connect 220VAC50HztoCN601andswitchon powerswitchSW601;
1-2Testthe voltagewithdigitalvoltagemeterbetween twoterminalsofC625;
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1-3Adjust VR601toobtain+110V+/-0.5Vreadingon the digitalvoltagemeter.
Note: The 5NchassisisautoB+voltagebySE130 orSE140used.
2. NTSCsystemabsorbingadjustment
2-1Setsweepgeneratormarkerto31.5MHz,33.5MHz,34.42MHz,37MHz,38MHzand
40.5MHz;
2-2Apply80dBuVsweepsignaltotunerIFterminal;
2-3Displaydemodulation probeconnectstopre-I.FAMPinput terminal, via. Q101 'b'pole;
2-4SetQ103'c'poleand'e'poleshortcircuit, adjustL104,and makethe attenuationmostat
33.5MHz.
3. Memorypartialinitializing
3-1Gotothe functionset menu (therearetwoways;)
a.Press CH+(PROG+)keyandCH-(PROG-) keyon the controlboardatthe sametime
and switchon powerswitch, then gotothe functionset menu.
b.AfterTVison, press "factory"key(SeeNote1)twin then gotothefunction set menu.
3-2Press 'PM'keyand 'SM'keyonthecontrolboardatthesametimeuntil the picture
changesslightly(jumpiness ortwinklingatone blow),thismeansthe memoryhaving
been partialinitialized. Operaterepeatedlyifthe picturehasnochange.
All oftheTVsetmustbepartial memoryinitializedbeforeexfactoryorafterchangeof
theChromaICNN5198 /NN5199orfullymemoryinitializedafterchangeofthe
EEPROM24C04 (Note4).
4. searchand storage
COMPLETEMACHINEGENERALADJUSTMENT
1.Screen VoltageAdjustment.
1-1Press 'screen' key(SeeNote1);
1-2Adjust thescreen knobofFBTtogetahorizontalfaintness beamline;
1-3Press 'screen' keyagainor'stand by'keytogotothe normalworkstatus;
2.FocusVoltageAdjustment.
2-1Receivemonoscopepattern. Set picturemode standardstatus;
2-2Adjust thefocusknobofFBTtoget theclearest picture.
3.horizontalcenteradjustment
3-1Receivemonoscopepattern;
3-2Press 'factory'key(See Note1)onetimeand gotosystemparameteradjustment
menu;
3-3Press 'MENU'key, gotohorizontalandverticalparameteradjustmentmenu;
3-4Select 'HPOSITION"bypressing'PROG+'keyand 'PROG-'key. Press 'VOL+'key
and 'VOL-'keyto
obtainthehorizontalcenterofthe patternat thecenterofCRTscreen.
3
3-5Exit systemparameteradjustmentmenu bypressing'factory'keytwin.
4.PALsystemverticalpincushion adjustment
4-1ReceivePALsystemcross hatchpatternsignal;
4-2Press 'factory'keyonetime, gotosystemparameteradjustmentmenu;
4-3Press 'MENU'key, gotohorizontalandverticalparameteradjustmentmenu;
4-4Select 'VLINE'and'V SCURVE' bypressing'PROG+'keyand'PROG-'key; press
'VOL+'keyand 'VOL-'keyandadjust correspondingparametertoobtainpicture'svertical
pincushion agood status.
5.PALsystemverticalsizeand verticalcenteradjustment
5-1Continueoperation 3. Select'V HEIGHT"and 'V POSITION', press 'VOL+'keyand
'VOL-'keyadjust correspondingparametertoobtainpicture'sverticalsizeand vertical
centeradjustment agoodstatus.
5-2Exit systemparameteradjustmentmenu bypressing'factory'keytwin.
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6.WhiteBalanceadjustment
ForFactoryAutoComputeradjustment
6-1Receivewhitebalancetest signal;
6-2Set picture"MILD"mode.
6-3InsertthespecialplugintoCN002,press adjustmentkeywhichbelongstowhite
balanceadjustment equipment and gotoautowhitebalanceadjustment;
6-4Afteradjustmentwell, removethe pug.
ForFactoryAutoComputeradjustment
6-5Press 'factory'keyonetimeand gotosystemparameteradjustmentmenu;
6-5Press "MENU"keyonce then gototheWhiteBalanceadjustment menu;
6-6Press ‘Prog+'keyand'Prog-'keytoselect theR, G, Bcutoffand R, BDriver.
6-7Press 'VOL+'keyand 'VOL-'keytochange. Orusingthe belowdirect key
6-8Key: 0forSUB-BRIGHT, 1forCUTOFF-R, 2forCUTOFF-G,
3forCUTOFF-B, 4forDRIVER-R, 5forDRIVER-B
Recall fortogglethe SubBright adjustment (Min. contrast, someCPUversion isnot
work)
7. Sub-bright adjustment
7-1ReceivePHILIPS signal;
7-2Set picture"Mild"mode.
7-3Press 'factory'keyone timeand gotosystemparameteradjustment menu;
7-4Press digitalkey'0', select'SUB-BRIGHT';
7-5Press 'VOL+'keyand 'VOL-'keyuntil Greyscalesignalcan besecerned;
7-6Exit systemparameteradjustment menu bypressing'factory'keytwin.
8.RFAGCadjustment
8-1Receive60dBuVmonoscopepattern;
8-2Press 'factory'keyone timeand gotosystemparameteradjustment menu;
8-3Press 'PROG+'keyand'PROG-'key, select 'RFAGC';
8-4Press 'VOL+'keyand 'VOL-'keytochangethevalue of'RFAGC'until picture'snoise
disturbingdisappearsjust; 4
8-5Exit systemparameteradjustment menu bypressing'factory'keytwin.
9.NTSCsystemhorizontalandverticaladjustment
ReceiveNTSCsystemcross hatchpattern. Adjustment'swayissameasPALsystem's.
10.warmupmode
10-1Switchon powerswitchand Press 'factory'keyone time;switchoffpowerswitch
and switchon powerswitchagain,atthistimethereisno signalwhiterasterand won't
switchoffautomatically. TVreceivercan besent towarmupline.
10-2Beforeexitwarmupline,press 'factory'keythreetimescontinue,atthistimeexit
warmupmode , thereisno signalandwill appearLOGO pattern.
NOTES:
1.Connect the remoteICPIN7andPIN16 throughajiggleswitchon the USERremotehandset,
thisswitchisdefined as"screen"key;ConnecttheremoteICPIN8and PIN16 throughajiggle
switchon the USERremotehandset ,thisswitchisdefined as"factory"key,
2.Onthe productline'salignmentservicewemustusespecialmemorizerthathasbeenwell
written data.
3.Ifhavingno specialmemorizerthathasbeenwell written datawhen servicingoutoffactory,
wecan useblanknewEEPROM.EEPROMwill beautomaticallytotallyinitialized aftermain
powerswitchison.Mostparametersarefree-alignmentafterinitialized;onlyneedadjustthe
severalparametersoffunction set parameterand systemparameteradjustmentmenu.
4.Ifno blanknewEEPROMorno specialmemorizerthat hasbeen well written data, wecan use
memorizerthathasbeen written datainstead,butmustbetotallyinitialized;the operationis
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asfollowing:
1.AfterTVison, press "factory"keytwin then gotothe functionset menu;
2.Press 'AV/TV' keyand 'MENU'keyon the controlboardatthe sametimeuntil the
picturechangesslightly(jumpiness ortwinklingatone blow);thismeansthe memory
havingbeen totallyinitialized. Operaterepeatedlyifthe picturehasnochange;
3.Switchoffand exit;
4.Afterinitialized,adjusttheseveralparametersoffunction setparameterand system
parameteradjustmentmenu.
5.the parametersoffunction setparameterand systemparameteradjustmentmenu mustn't
beadjusted;
1.systemparameteradjustment menu (Thisiscomingfromthe NN5198/ NN5199)
AFT
VIFVCO
HVCO
VIFDETNEG
VIFDETINT
VIFDETEXT
2.the ninthdigitalandthetenthdigitaloffunction set parameter
TheseparametersmustbeICinteriorvalues.Ifthe aboveparametershavebeen
changed, wemustpartiallyinitializethe EEPROM.
5
6.twodifferent initializing
1.fullyinitialize:initializethe EEPROM'smostworkdataand presetdefaultvalue.
Including:workparameterofNN5199,horizontalandverticalparameter,OPTION
parameter(via.function setparameter),picturemode parameter,volumemode
parameterand whitebalanceparameter.
2.partiallyinitialize:onlyinitializeworkparameterofNN5199 and the ninthdigitaland
the tenthdigitaloffunction setparameter(via.ISUD0,
ISUD1,ISUD3,ISUD4,ISUD5),preset asinteriorvalues.
7.Ifuse21”PureFlat tube, must adjust horizontalsizeand pincushiondistortion asfollowing:
1.Receivemonoscopepattern;AdjustVR902until overscan ratio(scanningsize)to92%
to96%
2.Receivecross hatchpatternsignal;AdjustVR901until thepinchusion ofthe CRTtwo
sidesaremost straight.
8.Ifuse25”orabovePureFlattube,mustadjusthorizontalsizeandpincushion distortion as
following:
1.Receive60dBuVPALsystemmonoscopepattern;
2.Press 'factory'keyone timeand gotosystemparameteradjustment menu;
3.Press 'MENU'keyandselect'PositionMenu 'asbelow
VPOSITIONforadjust verticalposition 00 to07
HPOSITIONforadjust Horizontalposition 00 to1F
VEHTforadjust verticalshape 00 to0F
HEHTforadjust Horizontalshape00 to0F
4.Press 'MENU'keyandselect'geometryMenu 'asbelow;
V-AMPforadjust verticalsize00 to7F.
V_LINEforadjust verticallinearity00 to3F.
V_SC3foradjust verticalS-correction X3 00 to3F.
H-AMPforadjust Horizontalsize00 to3F.
EW-PARAforadjust Pincushion 00 to3F.
EW-CORforadjust Pincushion corner00 to0F.
TRAPEZforadjust trapezium00 to3F.
V_SC5foradjust verticalS-correction X500 to0F.
5.Receive60dBuVNTSCsystemmonoscopepattern;
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5.1Repeat the abovestep7.2to7.4.
6. Exit systemparameteradjustment menu bypressing'factory'keytwin.
9.Option Code
1.Press 'factory'keytwinand gotoOption CodeMenu
Thefirst digit8DigitissetbyFactory.Thelasttwodigit“9”and “A”isthe randomdatafrom
NN5198/NN5199.
Option digit 1:
Binary Dec Function Default
000 0 SECAMLOFF, SECAMOFF, NTSCOFF
001 1 SECAMLOFF, SECAMOFF, NTSCON Default 7
6
010 2 SECAMLOFF, SECAMON, NTSCOFF
011 3 SECAMLOFF, SECAMON, NTSCON
100 4 SECAMLON, SECAMOFF, NTSCOFF
101 5 SECAMLON, SECAMOFF, NTSCON
110 6 SECAMLON, SECAMON, NTSCOFF
111 7 SECAMLON, SECAMON, NTSCON
Option digit 2:
Binary Dec Function Default
000 0 RGBBeamlimit ON, WooferOFF, Sharpincreaseat 3MHz
001 1 RGBBeamlimit ON, WooferOFF, Sharpincreaseat 4MHz
010 2 RGBBeamlimit ON, WooferON, Sharpincreaseat 3MHz
011 3 RGBBeamlimit ON, WooferON, Sharpincreaseat 4MHz
100 4 RGBBeamlimit OFF, WooferOFF, Sharpincreaseat 3MHz
101 5 RGBBeamlimit OFF, WooferOFF, Sharpincreaseat 4MHz
110 6 RGBBeamlimit OFF, WooferON, Sharpincreaseat 3MHz
111 7 RGBBeamlimit OFF, WooferON, Sharpincreaseat 4MHz
Default 3
Option digit 3:
Binary Dec Function Default
000 0 SystemBG OFF, SystemI OFF, SystemMOFF.
001 1 SystemBG OFF, SystemI OFF, SystemMON.
010 2 SystemBG OFF, SystemI ON, SystemMOFF.
011 3 SystemBG OFF, SystemI ON, SystemMON.
100 4 SystemBG ON, SystemI OFF, SystemMOFF.
101 5 SystemBG ON, SystemI OFF, SystemMON.
110 6 SystemBG ON, SystemI ON, SystemMOFF.
111 7 SystemBG ON, SystemI ON, SystemMON.
Default 7
Option digit 4:
Binary Dec Function Default
000 0 OnlyAV1
001 1 AV1+AV2
010 2 OnlyAV1
011 3 AV1+AV2+AV3
100 4 AV1+S-VHS
101 5 AV1+AV2+S-VHS
110 6 AV1+S-VHS
No
Default
1 2 3 4 5 6 7 89 A
1 3 7 1 4 0 4 6**
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111 7 AV1+AV2+AV3+S-VHS
Option digit 5:
Binary Dec Function Default
000 0 R/Bgain=0.56, GAMMAON, SKYWORTHgameOFF
001 1 R/Bgain=0.56, GAMMAON, SKYWORTHgameON
010 2 R/Bgain=0.56, GAMMAOFF , SKYWORTHgameOFF
011 3 R/Bgain=0.56, GAMMAOFF , SKYWORTHgameON
100 4 R/Bgain=0.83, GAMMAON, SKYWORTHgameOFF
101 5 R/Bgain=0.83, GAMMAON, SKYWORTHgameON
110 6 R/Bgain=0.83, GAMMAOFF , SKYWORTHgameOFF
111 7 R/Bgain=0.83, GAMMAOFF , SKYWORTHgameON
Default 4
7
Option digit 6:
Binary Dec Function Default
000 0 PIF=38.0MHz, NoSignalAutoOFF, NormalgainTuner
001 1 PIF=38.0MHz, NoSignalAutoOFF, HighgainTuner
010 2 PIF=38.0MHz, NoSignalno AutoOFF, NormalgainTuner
011 3 PIF=38.0MHz, NoSignalno AutoOFF, HighgainTuner
100 4 PIF=38.9MHz, NoSignalAutoOFF, NormalgainTuner
101 5 PIF=38.9MHz, NoSignalAutoOFF, HighgainTuner
110 6 PIF=38.9MHz, NoSignalno AutoOFF, NormalgainTuner
111 7 PIF=38.9MHz, NoSignalno AutoOFF, HighgainTuner
Default 0
Option digit 7:
Binary Dec Function Default
000 0 ExternalSIF,QSS ON, Menuline ON
001 1 ExternalSIF,QSS ON, Menuline OFF
010 2 ExternalSIF,QSS OFF, Menuline ON
011 3 ExternalSIF,QSS OFF, Menuline OFF
100 4 InternalSIF, QSSON, Menu line ON
101 5 InternalSIF, QSSON, Menu line OFF
110 6 InternalSIF, QSSOFF, Menu line ON
111 7 InternalSIF, QSSOFF, Menu line OFF
Default 4
Option digit 8:
Binary Dec Function Default
000 0 SKYWORTHpictureOFF,NoBlue Background,EnglishOSD
only
001 1 SKYWORTHpictureOFF,NoBlue Background,English/
ChineseOSD
010 2 SKYWORTHpictureON, EnglishOSDonly
011 3 SKYWORTHpictureON, English/ ChineseOSD
100 4 SKYWORTHpictureOFF,NoBlue Background,EnglishOSD
only
101 5 SKYWORTHpictureOFF,NoBlue Background,English/
ChineseOSD
110 6 CustomerLOGO ONorBlue Background, EnglishOSDonly
111 7 CustomerLOGO ONorBlue Background,English/Chinese
OSD
Default 0
9. CustomerLOGO
TheTVsetartallowtodisplaythe CustomerLOGO from1to9digitCharacterduringPower
on orNosignal.
Thereistwomethod tosettheCustomerLOGO on.
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9.1Gotothe function set menu (therearetwoways;)
a.Press CH+(PROG+) keyand CH-(PROG-) keyon thecontrolboardatthesametime
and switchon powerswitch, then gotothe functionset menu.
b.AfterTVison,press "factory"key(SeeNote1)twin then gotothefunction set
menu.
9.1.1Press the AVbutton totogglebetween LOGO andOption Code
9.1.2Press the belowbutton forthe differencefunction:
Recall : forthe SKYWORTHLOGO display
Timer: forquick Blue background display.
Number0to9: Forno. ofCharacterLOGO display.
Program+/-: Select the LOGO Characterformodify.
Volume+/-: ChangeofLOGO Character.
S.M. :ChangetheBlueBackground mode ortransparencemode.
P.M. : Changeofthe CharacterColor. 8
9.1.3Press the AVbutton totoggletothe Option Codemode and press the“Factory”key
twintoexit.
9.2Direct writethe datatotheEEPROMaddress.
Address
$199h No. ofCharacter 00 to09
$19C-$1A4hDisplayCharacter Refertable
$19Ah CharacterColor Refertable
$19Ah Color Data Charact
er Data Charact er Data Charact er
38h White FF Space 0C C 18 O
39h Red 01 1 0D D 19 P
3Ah Green 02 2 0E E 1A Q
3Bh Yellow 03 3 0F F 1B R
3Ch Blue 04 4 10 G 1C S
3Dh Magenta 05 5 11 H 1D T
3Eh Cyan 06 6 12 I 1E U
3Fh Black 07 7 13 J 1F V
08 8 14 K 20 W
09 9 15 L 21 X
0A A 16 M 22 Y
0B B 17 N 23 Z
COLOURPURITYAND CONVERGENCEADJUSTMENT
I. COLOUR PURITYADJUSTMENT(See Fig.1)
BEFOREANYADJUSTMENTSDESCRIBEDBELOWAREATTEMPTED,V-HIGH,B+VOLTAGE
AND FOCUSING ADJUSTMENTMUSTBECOMPLETED.
1. PlacetheTVreceiver facingNORTHor SOUTH,
2. PluginTVreceiver andturnit on.
3.OperatetheTVreceiver over 30 minutes.
1.FullydegausstheTVreceiverbyusingandexternaldegaussingcoil
2.Receiveacrosshatchpatternandadjust thestaticconvergencecontrolroughly.
3.Loosentheclampscrewofthedeflectionyokeandpull thedeflectionyoketowardsyou.
4.Enter intoADJUSTMENU.set thevaluesofC-R,C-G,C-Bto“00”.
5.Adjust thepuritymagnetssothat greenfieldisobtained at thecenterofthescreen.
6.Slowlypushthedeflectionyoketoward bellofCRTandsetitwhere auniformgreenfieldis
obtained.
7.Tightentheclampscrewofthedeflectionyoke.
II. CONVERGENCEADJUSTMENT(See Fig.1)
1.Receiveadotted pattern.
2.Unfixtheconvergencemagnetclamped andalignred withbluedotsatthecenter ofthescreenby
rotating.(R,B)staticconvergencemagnets.
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3.AlignRed/Bluewithgreendotsatthecenter ofthescreenbyrotating(RB-G)staticconvergence
magnet.
4.Fixtheconvergencemagnetsbyturningtheclamped.
9
5.RemovetheDYwedgesandslightlytiltthedeflectionyokehorizontallyandverticallytoobtainthe
good overallconvergence.
6.Fixthedeflectionyokebywedges.
7.Ifpurityerror isfound, follow“PURITYADJUSTMENT”instructions.
PurityMagnet
RB-GRB
MagnetClamper
StaticMagnet (FIG.1)
10
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