Daewoo DTJ-28G8F User manual

Service Manual
66 Cm STEREO Colour Television
CHASSIS : CP-810
DAEWOO ELECTRONICS CO., LTD.
http://svc.dwe.co.kr MAR,2000
MODEL : DTJ - 28A6F
DTJ - 28A7F
DTJ - 28B1F
DTJ - 28G6F
DTJ - 28G7F
DTJ - 28G8F
S/M No: CP810P-010

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TABLE OF CONTENTS
1. Safety Instruction ........................................................................................................................ 2
2. Specifications .............................................................................................................................. 3
3. Circuit block Diagram ................................................................................................................. 5
4. Alignment Instructions ............................................................................................................... 6
5. IC Description .............................................................................................................................. 12
6. IC DC Voltage Charts ..................................................................................................................32
7. Service Parts List/Recommendable Spare Parts List .............................................................. 35
8. Mechanical Exploded View......................................................................................................... 45
9. Printed Circuit Board ..................................................................................................................51
10. Schematic Diagram ..................................................................................................................... 52

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1. Safety Instruction
WARNING :Onlycompetentservicepersonnelmaycarryoutworkinvolvingthetestingorrepairofthisequipment
1.Excessivehighvoltagecanprodecepotentiallyhaz-
ardousX-RAYRADIATION.Toavoidsuchhazards,
thehigh voltage must not exceed the specified limit.
Thenominalvalueofthehighvoltageofthisreceiveris
23-24kvatmax beam current.Thehigh voltagemust
not,underanycircumstances,exceed 30kv.
Eachtimeareceiverrequire servicing,thehigh volt-
ageshouldbechecked.Itisimprortanttouseanaccu-
rateandreliablehighvoltagemeter.
2.TheonlysourceofX-RAYRadiationinthisTVreceiver
isthepicturetube.ForcontinuedX-RAY RADIATION
protection, the replacement tube must be exactly the
sametype tube as specified in the partslist.
X-RAY RADIATION PRECAUTION
1.Potentialsofhighvoltagearepresentwhenthis
receiverisoperating.Operationofthereceiveroutside
thecabinetor withthe backboard removedinvolvesa
shockhazardfromthereceiver.
1)Servicingshouldnotbeattemptedbyanyonewhois
notthoroughlyfamiliarwiththeprecautionsneces-
sarywhenworkingonhigh-voltage equipment.
2)Dischangethehigh potentialof thepicture tube
beforehandlingthetube.Thepicturetubeishighly
evacuated andifbroken, glassfragmentswill be
violently expelled.
2.IfanyFuseinthisTVreceiverisblown,replaceitwith
theFUSEspecifiedin theReplacementParts List.
3.Whenreplacingahighwattage resistor(oxidemetal
filmresistor)in circuitboard,keepthe resistor10mm
awayfrom circuit board.
4.Keepwiresawayfromhighvoltageorhightempera-
turecomponents.
5.ThisreceivermustoperateunderAC230volts,50Hz.
NEVERconnect to DC supply or any other power or
frequency.
SAFETYPRECAUTION
Manyelectricaland mechanicalparts inthis have
specialsafety-related characteristics. Thesecharac-
teristicsareoftenpassedunnoticedbyavisual
inspectionandtheX-RAYRADIATIONprotection
affordedbythemcannotnecessarilybeobtainedby
usingreplacement components rated for higher volt-
age,wattage, etc.Replacement parts whichhave
thesespecial safety characteristics are identifiedin
thismanual and itssupplements, electricalcompo-
nentshavingsuchfeaturesareidentifieddesignated
symbolon the partslist.
Beforereplacinganyofthesecomponents,readthe
partslistinthis manualcarefully.Theuse ofsubstitute
replacementparts whichdo nothave thesame safety
characterisiticsasspecifideinthepartslistmaycreate
X-RAYRadiation.
PRODUCTSAFETYNOTICE

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2. Specifications
CRT 28" : A66EAK071X54 ( PHILIPS )
System PAL/SECAM-B/G, D/K, PAL-I/I’, SECAM-L/L’, NTSC-3.58/4.43 (Play back )
Main Voltage 230V AC, 50Hz
Power Consumption Stand-by mode : 2.0 Watts
Normal operating mode : 80 Watts
Sound output 10 + 10 Watts, 10% THD at RF 60% mod. ( 1 kHz )
Speaker 12W 8ohm x 2 EA
Antenna Impedance 75 ohm unbalanced input (Din Standard )
Tuning system Frequency Synthesize(FS) Tuning System
Tuner DT5-BF14D, EL2782-105-B
Number of Program 100 programs
Aux. Terminal 21 pin EURO-SCART jack ( AV input, TV output, RGB input )
21 pin EURO-SCART jack ( AV input, S-VHS input )
RCA type AV input jack
Headphone jack ( 3.5 mm )
JACK AUDIO TERMINAL (AUDIO OUT L, R)
Remote controller R-22D05 with 2 "AAA" type batteries
Teletext TOP(5 Page memory) & FLOF(7 Page memory)
- West option : English, German/Dutch/Flemish, French, Italian, Spanish/Portuguese,
Swedish/Finnish/Danish, Hungarian, Rumanian, Turkish
- East option : Polish, Czech/Slovak, Rumanian, Servo-croat, German/Dutch/Flemish,
French, Estonian, Lettish
OSD language - West : English, German, French, Italian, Spanish, Nethelands, Swedish
- East : English, Russian, Polish, Rumanian, Czech, Hungarian
O
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PIN Signal Designation Matching Value
1Audio Out (linked with 3) 0.5Vrms, Imp < 1 k (RF 60% MOD)
2Audio In (linked with 6) 0.5Vrms, Imp < 10 k
3Audio Out (linked with 1) 0.5Vrms, Imp < 1 k (RF 60% MOD)
4Audio Earth
5Blue Earth
6Audio in (linked with 2) 0.5Vrms, Imp < 10 k (RF 60% MOD)
7Blue in 0.7Vpp 2dB, Imp 75
8Slow (Function) Switching TV : 0-2V, PERI : 9.5 - 12V, Imp > 10 k
9Green Earth
10 NC
11 Green In 0.7Vpp 2dB, Imp 75
12 NC
13 Red Earth
14 Rapid(Blanking) Switching Earth
15 Red In, C In 0.7Vpp 2dB, Imp 75
16 Rapid(Blanking) switching Logic 0 : 0 - 0.4V, Logic 1 : 1 - 3V, Imp 75
17 Video Earth
18 Rapid Blanking Earth
19 Video Out 1Vpp 2dB, Imp 75
20 Video In, Y In 1Vpp 2dB, Imp 75
21 Common Earth
Specifications
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3. Circuit Block Diagram

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4. Alignment Instructions
4-1.UserRemocon
R-22D05

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R-23D05
Alignment Instructions

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Alignment Instructions
*HowtoEnterthe“ServiceMode”withuserremocon.
1)SettheTVPr 91
2)Sharpness“MIN“control.
3)Red,Green,Yellowbuttons inregularsequencywithin 5secondsaftersettingTV poweroff.
4)YoucanseetheMenuof“servicemode“onthescreen.
5)The PRUP/DOWNbuttonsontheremotecontrollerareusedtomovetheselectionbarupordowntheMenus.
6)TheVOLUP/DOWNbuttonsontheremotecontrollerareusedtoadjustlevels.
7)Ifyouwanttoexitfrom“ServiceMode“thenpowertheTVoff.
-Youcansee theSVCMenu byOSDinTV set.
V. Slope
V.Center
V.Size
S.Curve
H.Center
H.Width
EW.Para
EW.CorT
EW.CB
EW.Sym
R.bias
G. b
B.b
R.drive
G. d
B.d
G2
SubBri
DT
005
995
220
019
-190
510
382
028
500
021
370
311
311
330
315
330
330
021
048
SVC v1

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4-2.AFT
Standard B/G, D/K,Iand L
1)SetaSignalGeneratorwith
-RFFREQUENCY=38.9MHz,
-RFOUTPUTLEVEL=80 5dBuV
-Pattern =ColorBar
-System=PAL-B/G
2) ConnecttheSignalGeneratorRFOutput toTP2(TunerIFOutput).
Theremustbenosignal inputtothetuner.
3)SettheL109toTP1(I101,#22)withDCVoltageto2.5V 0.1V
4-3.AGC
1)SetaPatternGeneratorwithRFLEVEL60 3dBuV,RFFrequency210.25MHz(10CH),PatternColorBar.
2)ConnectaOSCILLOSCOPEPROBEtoP101(TUNERAGCINPUT).
3) SettheRBOItoP101(TunerAGCInput) withDCVoltageto2.8V 0.2V
4-4.SCREEN(G2)
1) SetaPatternGeneratorwith-RF Frequency:210.25MHz(10CH)
-Pattern:RETMA
2)Selectthe“G2”inMenu
3) AndaHorizontalLinewillappear onthescreen.
4)AdjusttheSCREENVOLUME onFBTbarelytoseetheHorizontalLine.
5)PressthePRUP/DOWNkeystofinishtheSCREENadjustment.
4-5.FOCUS
1)ApplyaRETMAPATTERNsignal.
2)AdjusttheFOCUSVOLUMEonFBTtoobtain optimalresolution.
4-6.GEOMETRY
4-6-1 VERTICAL SLOPE ( Fixed : Adjust if need be )
1)ApplyaRETMAPATTERNSignal.
2)SettheTVtoNormalI mode.
3)Adjustthehighersemicircleandthelowersemicircletobethesame,withtheV.Slopebyvolume
Up/Downkeys.
4-6-2 VERTICAL CENTER
1)ApplyaRETMAPATTERNSignal.
2)SettheTVtoNormalI mode.
3)Adjustthecenterof the picturewiththeV.Centerby volumeUp/Downkeys.
Alignment Instructions
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