Memorex MT2025D - 20" CRT TV User manual

SERVICEMANUAL
ColourTelevision
Haiermodel:
21F7A
Customermodel:
MT2025D
lFEATURES
lDVD-TV21 COMBO
lAUTOTUNE/181 CHANNES
lDVD/VCD/SVCD/CD/CD-R/CD-RW/JPEG/MP3COMPATIBLE
lFORMATO DEVIDEO 4:3PS 4:3LB
lDOLBYAC-3DECODE
lPANATALLOCK
lATSCTUNER
lAC/DC
CAUTION READ
THISMANUALCAREFULLYTODIAGNOSE
TROUBLECORRECTLYBEFOREOFFERING
SERVICE.
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2
CONTENTS
1.Safetyprecautions……………………………………………………………..……………3
2.TVblock diagram……………………………………………………………………..…….4
3.ReplacementofmemoryIC………………………………………………………….……5
4.Service adjustment……………………………………………………………..…………...5
5.ICsfunctionaldescription…………………………………………………………………8
6.Testpointwaveform………………………………………………………………………10
7.All ICsvoltages……………………………..……………………………………………….10
8.Purity/convergence adjustment………………………………………………………11
9.DVDmaintenance…………………………………………………………………………13
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1. SAFETY PRECAUTIONS
1.Thedesignofthisproductcontainsspecial hardware,many
circuitsandcomponentsespeciallyforsafetypurposes.For
continued protection,nochangesshouldbemadetothe
originaldesignunless authorizedinwritingbythe
manufacturer.Replacementpartsmustbeidenticaltothose
usedintheoriginal circuits.Serviceshouldbeperformed by
qualified personnel only.
2.Alterationsofthedesignorcircuitryoftheproductsshould
notbemade.Anydesignalterationsoradditionswill voidthe
manufacturer swarrantyandwill furtherrelievethe
manufacturerofresponsibilityforpersonal injuryorproperty
damageresultingtherefrom.
3.Manyelectrical andmechanical partsintheproductshave
special safety-related characteristics.Thesecharacteristics
areoften notevidentfromvisual inspectionnorcan the
protectionaffordedbythemnecessarilybeobtained byusing
replacementcomponentsrated forhighervoltage,wattage,
etc.Replacementpartswhichhavethesespecialsafety
characteristics areidentifiedinthepartslistofService
manual.Electrical componentshavingsuchfeaturesare
identifiedbyshadingon theschematics andby( )on
thepartslistinServicemanual.Theuseofasubstitute
replacementwhichdoesnothavethesamesafety
characteristics astherecommendedreplacementpart
showninthepartslistofServicemanual maycauseshock,
fire,orotherhazards
4. Don’tshortbetweentheLIVE sideground and
ISOLATED(NEUTRAL)sidegroundorEARTHside
groundwhenrepairing.Somemodel spowercircuitis
partlydifferentintheGND.ThedifferenceoftheGNDis
shownbytheLIVE:()sideGND,ISOLATED
(NEUTRAL): ()sideGNDandEARTH: ()sideGND.
Don tshortbetweentheLIVEsideGNDandISOLATED
(NEUTRAL)sideGND orEARTHsideGND andnever
measurewithameasuringapparatus(oscilloscopeetc.)the
LIVEsideGND andISOLATED(NEUTRAL)sideGNDor
EARTHsideGND atthesametime.If abovenotewillnotbe
kept, afuseoranypartswill bebroken.
5.Ifanyrepairhasbeenmadetothechassis,itis
recommended thattheB1settingshouldbecheckedor
adjusted (See ADJUSTMENT OFB1POWERSUPPLY).
6.The highvoltageapplied tothepicturetubemustconformto
that specifiedinServicemanual. Excessivehighvoltagecan
causean increasein X-Rayemission,arcingand possible
componentdamage,thereforeoperationunderexcessive
highvoltageconditionsshouldbekepttoaminimum,or
shouldbeprevented.Ifseverearcingoccurs,removetheAC
powerimmediatelyanddeterminethecausebyvisual
inspection (incorrectinstallation,cracked ormelted high
voltageharness,poorsoldering,etc.).Tomaintain theproper
minimumlevel ofsoftX-Rayemission,componentsin the
highvoltagecircuitryincluding thepicturetubemustbethe
exactreplacementsoralternativesapproved bythe
manufacturerofthecompleteproduct.
7.Donotcheckhighvoltagebydrawinganarc.Useahigh
voltagemeterorahighvoltageprobewithaVTVM.
Dischargethepicturetubebeforeattemptingmeter
connection,byconnectingacliplead tothegroundframe
andconnectingtheotherendofthelead through a10kΩ2W
resistortotheanodebutton.
8.Whenserviceisrequired,observetheoriginal leaddress.
Extraprecautionshould begiventoassurecorrectlead
dress in thehighvoltagecircuitarea.Whereashortcircuit
hasoccurred,thosecomponentsthatindicateevidenceof
overheatingshouldbereplaced.Alwaysusethe
manufacturer sreplacement components.
9.Isolation Check
(SafetyforElectricalShockHazard)
Afterre-assemblingtheproduct, alwaysperformanisolation
checkon theexposed metal partsofthecabinet(antenna
terminals,video/audioinputandoutputterminals,Control
knobs,metal cabinet, screwheads,earphonejack,control
shafts,etc.)tobesuretheproductissafetooperatewithout
dangerof electrical shock.
10.The surfaceoftheTVscreeniscoatedwithathinfilmwhich
can easilybedamaged. Beverycarefulwithitwhen handle
theTV. ShouldtheTVscreen becomesoiled, wipeitwitha
softdrycloth.Neverrubitforcefully.Neveruseanycleaner
ordetergenton it.
(1)DielectricStrengthTest
Theisolation between theACprimarycircuitandallmetal
partsexposed totheuser,particularlyanyexposed metal
parthavingareturnpathtothechassisshouldwithstanda
voltageof 3000VAC(r.m.s.)foraperiod of onesecond.
(…Withstandavoltageof 1100VAC(r.m.s.)toanappliance
ratedupto120V,and 3000VAC(r.m.s.)toanappliance
rated 200Vormore,foraperiodof onesecond.)
Thismethodoftestrequirestestequipmentnotgenerally
foundintheservicetrade.
(2)LeakageCurrentCheck
PlugtheAClinecorddirectlyintotheACoutlet(donotuse
lineisolation transformersduring thischeck).Using a
“LeakageCurrent Tester”,measuretheleakagecurrentfrom
eachexposedmetal partofthecabinet, particularlyany
exposedmetal parthavingareturnpathtothechassis,toa
knowngood earthground(waterpipe,etc.).Anyleakage
currentmustnotexceed0.5mAAC(r.m.s.).
However,intropical area,thismustnotexceed0.2mAAC
(r.m.s.).
●AlternateCheck Method
PlugtheAClinecorddirectlyintotheACoutlet (donotuse
alineisolationtransformerduringthischeck.).UseanAC
voltmeterhaving 1000 ohmspervoltormoresensitivityin
thefollowingmanner.Connecta1500Ω10Wresistor
paralleled bya0.15μFAC-typecapacitorbetween an
exposed metal partand aknowngoodearthground(water
pipe,etc.).MeasuretheACvoltageacross theresistorwith
theACvoltmeter.Movetheresistorconnection toeach
exposed metal part, particularlyanyexposed metal part
having areturnpathtothechassis,and measuretheAC
voltageacross theresistor.Now,reversetheplug intheAC
outletand repeateachmeasurement.Anyvoltagemeasured
mustnotexceed0.75VAC(r.m.s.).Thiscorrespondsto
0.5mAAC(r.m.s.).
However,intropical area,thismustnotexceed0.3VAC
(r.m.s.).
Thiscorrespondsto0.2mAAC(r.m.s.)
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2. BlockdiagramR2J10165GCserieswithstereointercarriersounddemodulator
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3. REPLACEMENTOFMEMORYIC
1.MEMORYIC.
ThisTVusesmemory IC.Inthe memory ICarememorized dataforcorrectlyoperatingthe video and deflection
circuits.
2.PROCEDUREFORREPLACINGMEMORYIC
(1)Poweroff
Switchthe poweroff and unplug the powercordfromACoutlet.
(2)ReplaceIC
BesuretousememoryICwritten withthe initial datavalues.
(3)PowerOn
Plug thepowercordintothe ACoutlet and switchthe poweron.
(4)Check and set SYSTEM default value:
1)Press “MENU”à“8”à”8”à”9”à”3”buttonsinsequencetoenterintofactory status.
2)Ifthe memoryIChaven tbeen written withthe initial data,press [Program+]/[Program-]toselect
itemINIT and press [VOLUME+]/[VOLUME-] tostart initializememory IC.
3)Check the setting valueof the SYSTEMdefaultvalue ofTablebelow.Ifthe value isdifferent,select
itemsby[Program+]/ [Program-] keysand setvalue by[VOLUME+]/[VOLUME-]keys.
4)Press “EXIT”button toreturntothe normalscreen.
4. SERVICE ADJUSTMENT
Specificoperation:useremotecontroller
Press “MENU”à“8”à”8”à”9”à”3”buttonsinsequencetoenterintofactorymode.Press “MENU”toenterinto
next factory menu.
Press [Program+]/[Program-]toselectitemsand press [VOLUME+]/[VOLUME-] key,tomakedata
adjustmentofcorresponding factory menus.
Press “EXIT”keytoexit factory mode.
Focusadjustment
1.Receiveacrosshatchsignal.
2.Whilewatching the screen,adjustthe FOCUSVRon the FBTtomakethe vertical and horizontallinesas
fine and sharpaspossible.
Geometrical adjustment
ReceiveNTSCstandardcompletepatternsignal.
Adjustment steps：
a)Adjust VSC,Semendation
b)Adjust VSIZE, toget92% ofvertical picturecontentswouldbe displayed on CRT.
c) Adjust VPOS, the centrehorizontalline correspondstoCRT verticalcentre.
d)Adjust VLIN, tothe linearityof Pcardfieldisinpropercondition.
e)Adjust HPHASE,togetthe picturehorizontal centrecorrespond toCRThorizontalcentre.
ReceiveNTSCsignaland repeataboveadjustment.
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AGCAdjustment
Receive60dBμ(1mV) VHcolourbarpatternsignal.
SelectRFAGCitem.
Adjust value, tonoisereducegraduallyandjust disappeared point.
CRTcutoffandwhitebalance adjustment
a)CRTcut off adjustment
1.SelectitemVG2B, then adjustvalue to32.
2.PRESS “MENU”keytopage 2, when the screen shows”VK”adjust the SCREENcontrolon Flyback
transformertomakethe screen showalternating flashing characterstodarkle.
b)Whitebalanceadjustment
1.ReceiveaBlackand Whitepattern.
2.Adjust RC,GC,BC,RD,BDitemstoget colourtemperature9300K ±3JND.
A3.ErrorDetectionProcess
1.
Check tosee if
Fuseisnormal
Nolight and sound
Abnormal
CheckD901~D904,
C914,IC9601,Q901
Checktoseeifthe
collectorvoltageof
D909is13.5V
Thefailureofhorizontalunit
orN204
Check tosee
if, ZD201 8v,
isnormal
Check the control
voltageofQ207 or
CPUpowerpin
Check IC602 ,ect
Normal
Normal
Normal Abnormal
Checktosee110V、180V
etc.voltageisnormal
Testtoseeallterminal
Resistanceofload
Checkswitch
powerunit Check tosee if
rectifyingtube
isnormal
Check the
Loader Change
rectifyingdiode
Abnormal
Normal
Abnormal
Normal Abnormal
Normal Abnormal
Thefailureofhorizontal
unit orIC201
MaintenanceServiceand Troubleshooting
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2
Normal Abnormal
Videoamplifying
boardisabnorma
l
T401, D402or
C419,C420 are
broken
Q402 isnot well
welded oropen
Higher Lower
Inspect the circuit
frompin51 、52、
53 ofIC201 to
video amplifying
board
Check the voltage
ofQ402 collectoris
normal
InspectT402、R427
etc.
Normal
Abnormal
NO
YES
Abnormal
Normal Normal Abnormal
Abnormal
Normal
Check the voltage
ofall pinsofSK501
H
eaterResistor
open Check tosee ifbe
voltageofQ402 is
existed?
Check the circuit
frompin15 ofIC201
toQ402
Noraster
WhetherG2voltageisnormal
Changewrongcomponent
orcheck
peripheral
Check tosee if+8V
voltageisnormalat
PIN10 or14ofIC201
Check X201、IC201and
peripheralcircuit ofIC201 Check +8V,+5Vpower
Abnormal
Normal
Test filament voltage Testthe basevoltageofQ402
MaintenanceServiceand Troubleshooting
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3
4.
Check tosee ifthe deflection
yorks areconnected, C404is
open orweldless. Inspect
peripheralcomponent ofIC401
and
IC
40
1
itself
Inspect +28V
powersupply
Inspect IC201
and peripheral
componentsof
IC
20
1
ChangeIC201 and
repaircircuit
Normal
Yes
No
Yes
No
Check toseeifthe voltageof
pin11and pin12 ofIC201 is
normal
Check tosee ifvoltageofpin2 at
IC401 isnormal
YesNo
MakeR429 open. Multimeterisat rangeR 1K. Red
probeconnectstoground.TouchNo.5ofIC401 with
black probe. Bright line flashesforamoment
Horizontalbright line
Snowynoiseexist
Nosound andpicture
Not exist Exist
Check tosee ifRAGCis
at 00 mode Check tosee ifvoltage
output availableat tuner
EnterD-MODEwith
customerremotecontroller.
MakeRAGCtuned to25or
so. Noiseon picturejust
disappears.
Inspect SAW101、
IC201andPIF part
Yes No
Antenna
ortuneris
abnormal
Inspect the
circuit from
CPUtotuner
Yes
No
MaintenanceServiceand Troubleshooting
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5
6.
MakeC713/C714open. Multimeterisat band RΧ1K. Red
probeconnect toground.TouchNo.6ORNo.8ofIC701 with
Pictureexistsbut no sound
MakeC713 ORC714 collector
open. TouchNo.6ORNo.8of
Q702 withblack probetosee if
Poweramplifierisabnormal.
Inspect IC701 and peripheral
componentsofIC701
Inspect C713、C714 Check tosee if
+16Vexists
Inspect IC201 and peripheral
component ofIC201 Inspect +16V
powersupply
Yes No
YesNo
Yes
No
Havenoise
Nonoise
Inspect Inspectthe circuitfrom
No.51 ofIC201 to
No.3ofSK501
Yes
No
ChangeV501or
weldV501 again Check tosee ifvoltagesofSK501
arenormal
Lack ofred
Check tosee ifV501is
open ornot well welded
InspectR502,R503,R504
MaintenanceServiceand Troubleshooting
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AdjustableItems
P1：
Items Preset Remark Description
HPHASE0 ~31
14 Horizontalshift
VSIZE0 ~63 20 Verticalamplitude
VPOS0 ~7 2 Verticalshift
VLIN0 ~63 29 Verticalslop
VSC0 ~63 32 Semendation
PARABOLA0 ~63 32 S-correction
TRAPEXIUM0 ~63 32 Echclondistortioncorrection
HSIZE0 ~63 32 Horizontalamplitude
CORNER0 ~63 40 TOP Vertical distortioncorrection
注：
P2：
Items Preset Remark Description
RC 0~255 120 WhitepointR
GC0 ~255 120 Whitepoint G
BC 0~255 120 WhitepointB
RD0 ~127 70 Blackleveloffset R
BD0 ~127 75 Blackleveloffset B
SB0 ~127 47 Aassistantbrightness adjust
VK0~1 0 Horizontallinechoice [fieldsurgestopchoice]
WBBRI
0 ~127
47 Horizontalline brightness
P3：
Items Preset Remark Description
RB YUV-128~128 0 ◆INYUV，Black leveloffset R
GBYUV-128~128 0 ◆INYUV，Black leveloffsetG
BB YUV-128~128 0 ◆INYUV，Black leveloffset B
RDYUV-128~128 0 ◆INYUV，WhitepointR
BDYUV-128~128 0 ◆INYUV，WhitepointB
CR PEDDOT0~15 8 ◆CR benchmarkvoltageadjust
CB PEDDOT0~15 8 ◆CB benchmarkvoltageadjust
CRCB PEDON 0~1 1 ◆YUVbenchmarkvoltageswitch
CRCB GAINUP0~1 0 ◆YUVbenchmarkvoltageplus
P4：
Items Preset Remark Description
VIFVCOOK OK ◆PictureIFadjust
STRAPOK OK ◆Soundfrequencyadjust
RFAGC0 ~127 35 ◆AGCadjust
VIDEOLVL0 ~7 7 ◆Videodemodulation outputvoltagecontrol
P5：
Items Preset Remark Description
OSDHP0~63 35 ◆OSD Horizontalvision positionadjust
OSDVP0 ~31 21 ◆OSD Verticalvisionposition adjust
HTONE0~1 0 ◆Translucence ON-OFF
AOSD0 ~1 0 ◆A/DOSDchoice;0 =DOSD;1 =AOSD;
OSDL0 ~1 0 ◆DOSDoutputvoltagechoice;0 =70%;1=90%
TITLE0 ~127 57 ◆OSDtitlecolorchoice
MENU0~127 79 ◆OSDcolorchoice
MENUHL0 ~127 57 ◆OSDpitchoncolorchoice
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P6：
Items Preset Remark Description
ENG 0 ~1 1 EnglishOSD ；ON =Y；OFF =N
FRE0 ~1 1 FrenchOSDON =Y；OFF =N
SPA0 ~1 1 SpanishOSDON =Y；OFF =N
POR0~1 0 PortugalOSDON =Y；OFF =N
DVDMD0 ~3 1 DVDsignalformat，0:CVBS；1:YC；2:YUV；3：hold
DVDOFF T0~127 0 Poweroff DVDoff delaytime
2DVDBLKT0~255 70 TvtoDVDblackscreentime
P7：
Items Preset Remark Description
ON DLYT0 ~15 6 Poweron blackscreentime；0-15s
AVSMUTETIM0 ~255 30 Changechannalblackscreentime;10ms
LOGO COLOR0 ~71 Labelcolorchoice
LOGO 0 ~1 0 LabelchoiceON-OFF ON =Y;OFF =N
INTAUDIO0 ~1 1 Insidevolumecortrolchoice；ON =IN；OFF =OUTPWM
BTSC0~1 0 ◆MTSON-OFF
FACSW 0 ~1 0 Foctoryadjusthotkey；ON =Y；OFF =N
POWMD0~3 0 Power0=standby，1=powerON，2=memory，3=else
C_10164/5
070119
ATVsoftwareedition
P8：
Items Preset Remark Description
AUTO/N/PM/PN0 ~1 1 ◆AUTO/N/PM/PNfunctionchoice
AUTO/N/N4/P0 ~1 0 ◆AUTO/N/PM/PNfunctionchoice
PAL0 ~1 0 ◆PAL；0 =N；1 =Y
NTSC0 ~1 1 ◆NTSC；ON =Y；OFF =N
N443 0~1 1 ◆NTSC4.43；ON =Y；OFF =N
P358 0 ~1 0 ◆3.58PAL；0 =N；1 =Y
PALM0 ~1 0 ◆PAL –M；ON =Y；OFF =N
PALN0 ~1 0 ◆PAL-N；ON =Y；OFF =N
P9：
Items Preset Remark Description
AV20~1 1 AV2；1=Y；0 =N
YUV0 ~1 0 YUV；1 =Y；0 =N
DVD0 ~1 0 DVD；1=Y；0=N
P10：
Items Preset Remark Description
YDL0~7
5 Brightness signaldelaytimeadjust
YLPF 0 ~1 0 Brightness signaloutputlowpass choiceswitch;0=flat
out; 1 =lowout(fc=700kHz)
BLKSTEOFF 0 ~1 0 Blackvoltageextendfunctionswitch;0 =ON;1=OFF
GAMMA0 ~3 0 GAMMAadjustcontrol;0 =OFF;1~3 =ON(3 mode)
ABCL0 ~1 0 AUTObrightness andcontrastlimit; 0 =AUTOcontrast
limit; 1 =AUTObrightness andcontrastlimit
ABCLGAIN0 ~1
0 AUTObrightness andcontrastlimitplusswitch;0 =low;1
=high
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UDL0 ~3 3 Usignaldelayadjust
VDL0 ~3 0 Vsignaldelayadjust
LCNR0 ~63 32 Downpillowshapedistortion
P11：
Items Preset Remark Description
CTRAP0 ~3
2 Colourtrapwaveadjust
HVCO0~7 3 Rowfrequencyadjust
SIFBFP0 ~3 0 SIFstrappass widthchoice
SIF45 GDN 0~1
0 4.5Mhzsoundplusattenuationswitch；0 =normal；1=
attenuation。
STRAPOFF 0 ~1
0 Soundtrapwaveswitch
AFC1 UP1 0 ~1
1 LevelAFC1plusadjust
AFC1 UP2 0 ~1 1 LevelAFC1plusadjus
AFC2 DOWN0 ~1
0 LevelAFC2plusadjus
AFC2 UP0 ~1 1 LevelAFC2plusadjus
.
5. ICsfunctionaldescription
1.IC201 R2J10165GC
SYMBOL PIN DESCRIPTION
SP00/14bPWM 1 SP00/14bPWM
SP01/PWM 2 SP01/PWM
SP02/PWM 3 SP02/PWM
SP03/PWM 4 SP03/PWM
TEST0 5 TEST0
P04/AD2 6 P04/AD2
P05/AD1 7 P05/AD1
P06/TIM31 8 P06/TIM31
AFT(AD0) 9 SIFautophasecontrol
DEFVCC(8.0V) 10 8VPOWER
VRAMP(+) 11 VRAMP(+)
VRAMPCAP 12 VRAMPCAP
AFC1FIL 13 SIFautophasecontrolfilter
DEFVCC(5.0V) 14 5VPOWER
HOUT 15 HorizontalSIGNALOUT
FBPIN 16 FBPIN
DEFGND 17 GND
VRAMPAGC 18 VRAMPAGC
CbINYcbCr 19 CbINYcbCr
CrINYcbCr 20 CrINYcbCr
C-APC 21 C-APC
XTAL 22 XTAL
CHROMAGND 23 CHROMAGND
YSWOUT 24 YSWOUT
TEST/EWOUT 25 TEST/EWOUT
MCU 5.7VDD OUT 26 MCU 5.7VDD OUT
PALIDFIL 27 PALIDFIL
8.7VREG OUT 28 8.7VPOWEROUT
EXTAU(L)IN/EXTAU2
IN 29 EXTAU(L)IN/EXTAU2IN
EXT2IN/CINYC 30 EXT2IN/CINYC
CHROMAVCC(5.0) 31 CHROMAVCC(5.0)
EXT1IN/YINYC/YINY
CbCr 32 EXT1IN/YINYC/YINYCbCr
5.7VREG OUT 33 5.7VPOWEROUT
VIFVIDEOOUT 34 VIFVIDEOOUT
VIFGND 35 GND
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VIFAPC 36 VIFAPC
RFAGC 37 RFAGC
VIFIN2 38 VIFIN2
VIFIN1 39 VIFIN1
VIFAGC 40 VIFAGC
VIFVCCF/B 41 VIFVCCF/B
VIFVCC(5.0V) 42 5.0VPOWER
EXTAU（R）IN/EXTAU1
IN 43 EXTAU（R）IN/EXTAU1IN
AUBYPASS 44 AUBYPASS
SIFMIXF/B 45 SIFMIXF/B
AUATT（R）OUT/ATT
OUT 46 AUATT（R）OUT/ATTOUT
DIRECTOUT 47 DIRECTOUT
AUATT（L）OUT/ATT
OUT 48 AUATT（L）OUT/ATTOUT
ACL/ABCL 49 ACL/ABCL
HI VCC（8.0）50 HI VCC（8.0）
ROUT 51 ROUT
GOUT52 GOUT
BOUT 53 BOUT
VREG VCC（8.7V）54 VREG VCC（8.7V）
MNITOR-OUT 55 MNITOR-OUT
MCU RESET 56 MCU RESET
P20 57 P20
P21 58 P21
P22 59 P22
HLF 60 HLF
VHOLD 61 VHOLD
CVIN 62 CVIN
P26/AD6 63 P26/AD6
AD6/P27 64 AD6/P27
P35/TIM21 65 P35/TIM21
CNVSS 66 CNVSS
TEST1Note1 67 TEST1Note1
TEST2Note2 68 TEST2Note2
VSS 69 VSS
FILT 70 FILT
VDD 71 VDD
P36 72 P36
P17/INT3/AD4 73 P17/INT3/AD4
P16/INT2/AD3 74 P16/INT2/AD3
P15/INT1 75 P15/INT1
P10 76 PIN10
P11/SCL1 77 I2C-busclock line1
P12/SCL2 78 I2C-busclock line2
P13/SDA1 79 I2C-busdataline1
P14/SDA2 80 I2C-busdataline2
2.IC602 24C16
PIN Function
1 GND
2 GND
3 Upperresistance
4 GND
5 SDAdatawire
6 SCLclockwire
7 GND
8 +5VPower
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3.IC701: Sound poweramplify(TFA9800J)
Symbol PINFunction Symbol PIN
Function
-INV1 1 Non-invertinginput1Vp 7 Supplyvoltage
SGND 2 Signalground M/SS 8 Mute/standbyswitch
input
SVRR 3 Supplyvoltageripple
rejectionoutput -INV2 9 Non-invertinginput2
Out 14 Output1
PGND 5 Powerground
OUT2 6 Output2
4. IC401: Verticaloutput(STV9302A()
Symbol PIN
Function SymbolPIN
Function
INPUT 1 Invertinginput Poutputstage supply 6 Outputstagesupply
SUPPLYVOLTAGE
2 Supplyvoltage Input 7 Non-invertinginput
Flyback generator 3 Flyback generator
GND 4 Groundornegative supply
Output 5 Output
5.U101：Tuner
PIN
Function PIN
Function
1 Nc 7 +5V
2 Tu 8 IFA1
3 Rf agc 9 IFAGC
4 SCL 10 IFD1OUT
5 SDA 11IFD2OUT
6 Btl
6. Test pointWaveforms
5Vpp
0.9Vpp
1.3Vpp
H
H
1Vpp
V
CRTKB
CRTKGCRTKR
95Vpp
95Vpp
95Vpp
H
H
H
R2J10165GC
2.5Vpp
2.5Vpp
3.8Vpp
H
H
H
R2J10165GC
R2J10165GC
R2J10165GC
R2J10165GC
0.8Vpp
V
R2J10165GC R2J10165GC R2J10165GC
1.2Vpp
2.6Vpp
H
H
R2J10165GC
R2J10165GC
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7. ICvoltages
R2J10165G
PIN
1 2 3 4 5 6 7 8 9 10
11
12
13
14
15
16
V 00.02
4.9
0.03
04.72
0.04
0.15
2.05
8.04
2.99
2.36
3.2
50.83
0.93
PIN
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
V 02.04
1.15
1.15
2.97
3.2
03.76
3.91
5.59
2.28
8.73
3.29
1.97
52.73
PIN
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
V5.68
2.86
02.74
0.17
1.47
1.47
2.53
3.09
53.3
3.45
2.4
3.43
3.15
3.43
PIN
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
V2.47
8.03
2.57
2.49
2.59
8.87
0.42
4.9
4.94
4.95
3.82
1.96
0.33
2.9
4.95
4.94
PIN
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
V4.95
00.16
4.95
01.76
4.95
4.95
4.94
4.83
0.03
4.95
3.52
3.7
3.58
3.73
STV9302A
PIN
1 2 3 4 5 6 7
V2.993
26.8
14.57
0 1.96
26.05
2.991
TFA9800J
PIN
1 2 3 4 5 6 7 8 9
V 2.15
0 7.53
7.5 0 7.51
15.48
13.93
2.122
24C16
PIN
1 2 3 4 5 6 7 8
V 0 0 0 0 4.95
03.52
3.58
8. PURITY/ CONVERGENCE ADJUSTMENT
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PURITYADJUSTMENT
1.DemagnetizeCRTwiththe demagnetizer.
2.Loosen the retainerscrewofthe deflection yoke.
3.Removethe wedges.
4.Inputagreen rastersignalfromthe signalgenerator,
and turnthe screen togreen raster.
5.Movethe deflection yokebackward.
6.Bring the long lug ofthe puritymagnetson the short
lug and positionthemhorizontally. (Fig2)
7.Adjustthe gap betweentwolugssothatthe GREEN
RASTERwillcomeintothe centreofthe screen.
(Fig. 3)
8.Movethedeflection yokeforward,andfixtheposition
ofthedeflection yokesothatthe wholescreen will
becomegreen.
9.Insert the wedge tothe top side of the deflection yoke
sothat it will notmove.
10.Input acrosshatchsignal.
11.Verifythatthe screen ishorizontal.
12. Inputred and blue rastersignals,and makesurethat
purityisproperlyadjusted.
CRT
WEDGE
DEFLECTION YOKE
P
46
P:PURITYMAGNET
4:4-POLES (convergencemagnets)
6:6-POLES (convergencemagnets)
P/CMAGNETS
Fig. 1
PURITYMAGNETS
Longlug
Shortlug
Bring thelonglugovertheshortlugand
positionthem horizontally.
Fig. 2
(FRONTVIEW)
GREENRASTER
CENTER
Fig.3
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STATICCONVERGENCEADJUSTMENT
1.Input acrosshatchsignal.
2.Using 4-poleconvergencemagnetsoverlapthered
and blue linesinthe centerofthe screen (Fig.1)and
turnthemtomagenta(red/blue).
3.Using 6-poleconvergencemagnetsoverlap the
magenta(red/blue)and green linesinthe centerofthe
screen and turnthemtowhite.
4.Repeat2and 3above,and makethe best
convergence.
DYNAMICCONVERGENCEADJUSTMENT
1.Movethedeflectionyokeupand downand overlap
linesinthe periphery.(Fig.2)
2.Movethe deflectionyokelefttorightand overlap the
linesinthe periphery.(Fig.3)
3.Repeat1and 2above,and makethe best
convergence.
Afteradjustment,fixthe wedge at the originalposition.
Fasten the retainerscrewof the deflection yoke.
Fixthe 6magnetswithglue.
(FRONTVIEW)
Fig. 1
(FRONTVIEW)
REDGREENBLUE
BLUE
RED
GREENGREEN
REDBLUE
BLUEGREENRED
Fig.2
(FRONTVIEW)
REDGREENBLUEBLUEGREENRED
RED
GREEN
BLUE
BLUE
GREEN
RED
Fig. 3
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9. DVDPart:IntroductionofMTK1389Dmaintenance
NOTE:MTK1389D isatype ofLSICforDVDdecode .MTK1389D ICconsistsof
RF,SERVO,DSP,DECODE,VIDEO DACandAUDIO DAC.
1.Undernormalpowersupplyconditions,the maintenanceplan forMT1389D mono-chipis:firstthe reset
circuitresetsthe MT1389D,afterthecrystaloscillatorcircuitgavethe clocksignal toMT1389D,MT1389D will
start the initialization check forFlash、E2PROM、SDRAM, aftereverything ischecked tobe normal,it willstart
initialization checkforbuilt-inAudioDAC, servoand motorDriverIC.
2. Iftheall thea.m.partsaregood,thenMT1389Dwill send signaltomotorDrivertodrivetheservo
system，pickup then togenerateDVDlightforcollection,tracing the mainshafttocheckifthereisanydisc,and
confirmifitisCD format orDVDformat disc. If the discisinDVDformat, the systemwillread the datafromthe
discdirectly;ifitisinCD format built-inservowilldrivethe CD lasertosend out CD light and read the data, the
datathen will be amplified through built-inRFamplifierand senttoMT1389D decode partfordataprocessing,
released byMPEGand resolved intovideo dataand audiodata,then theywill be returned toanalog signals
through built-inVIDEODAC、AUDIODAC.
Decodersection
3.Thereispowersupply, clockand reset, butthe systemdoesnot work.
1）Check ifallthe address wiresrequired forFLASHareexist,and iftheyareinnormalstatus,
especiallycheck ifthe A0~A15 ofFLASHhavenormalsignals,iftherearen t, then inspectMT1389D tosee if
thereisfaultysoldering.IftherearenormalsignalsatA0~A15,check ifthe address datasignalofMT1389D
and SDRAM isnormal. Ifit isnormal,then check the signalatA16~A19 ofMT1389D; iftherearealsosignals,
then checkthevideo outputwiresand AVfiltercircuit; ifthereisno signal,then check the corresponding pins
of MT1389D tosee if thereisanyshort circuit,breakorfaultysoldering.
4.Systeminnormal operation,butthe audiohasno sound.
1）Becausethe AUDIO DACisbuilt inMTK1389D IC.youneed tocheckthelowerpassing amplifying
circuitand the MUTEcircuitatthe back of the LPFcircuit. Alsocheck ifthereisanypowersupplytothe LPF
circuit.
2）Check if the powersupplyvoltage required forplaying isat normallevel.
ServoSection
5.Afterthe LOGO ofthemachineshowsnormally,thereisno OSDdisplay.Thisproblemmainlyiscaused
bythe abnormalitybuilt-inRFand servo,possibleproblemsmaybe:
1）BuiltinRF and itssurrounding circuitshaveproblems.
2)Servopart of MT1389D hasproblems.
6.OSDdisplayisnormal，whilethereisno action ofservopart（feedingmotordoesnotwork,mainshaft does
no turn, possiblefault statusare:
1)The corresponding signalsgiving byMT1389D toDMSO、FMSO aremissing, the reason maybethe
problemof MT1389D orthe communication between MT1389D and motorDriverICSA5668.
2)NotoutputfromMotorDriver,thereason maybe the problemon motorDriveroritscorresponding
circuit.
7.Servopartingood status, whilethereisno pickup action（no light,no focus）
1）No light, checkthe powersupply（powersupplyforpick up）,orthelight producing driving circuit tosee
if theyareinnormalstatus.
2）No focus, check MT1389D tosee ifthereissignaloutputfromFOSO、TRSO.
Secondly,check motordrivertosee if thereisF+、F-、T+、T-signaloutput.
Thirdly, checkthe externalcorresponding circuit of themotordrivertosee if thereisanyproblem.
8.Allthe servopart hasaction, whileitcannot read outthedisc
1）Check MT1389D ifthereisRFnetpictureoutput,ifthereisn t, then itmustbe theproblemof
MT1389D and externalsurrounding circuits,itthereisoutput, then itmightthe problemofMT1389D
and itssurrounding circuits.
2）ThereisRFsignal，butnotinnormalstatus，then check MT1389D and surrounding circuits.
3）Everything isnormal, butthe disccannot be read out, checkMT1389D and itssurrounding circuit
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SincereForever
HaierGroup
HaierIndustrial Park,No.1,HaierRoad
266101, Qingdao, China
http://www.haier.com
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