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CN-230


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                                     S/M No : TCN230FEF0


Service Manual
COLOR TELEVISION
CHASSIS : CN-230F
Model : DTQ-20U4SC
        DTQ-2033SC
        DTQ-27U4SC




 Caution
 : In this Manual, some parts can be changed for improving, their
   performance without notice in the parts list. So, if you need the
   latest parts information,please refer to PPL(Parts Price List) in
   Service Information Center (http://svc.dwe.co.kr).




                  http : //svc.dwe.co.kr              Mar. 2003
TABLE OF CONTENTS
SAFETY PRECAUTIONS                                                      2
SPECIFICATIONS                                                          5
CIRCUIT BLOCK DIAGRAM                                                   6
ALIGNMENT INSTRUCTIONS                                                  7
    YOUR REMOTE CONTROL                                                 7
    SERVICE MODE ADJUSTMENT                                             8
    ASSEMBLY ADJUSTMENT                                                10
SCHEMATIC DIAGRAM                                                      13
ELECTRICAL PARTS LIST                                                  17
DIFFERENT PARTS LIST                                                   37
EXPLODE VIEW                                                           42
PRINTED CIRCUIT BOARD                                                  45


APPENDIX(Appendix is provide only by internet[http://svc.dwe.co.kr])
IC DESCRIPTION                                                         48
WAVEFORMS                                                              54
TROUBLE SHOOTING GUIDE                                                 57
     NO POWER                                                          57
     NO PICTURE                                                        58
     NO SOUND                                                          59
     CH DON'T STOP                                                     60
     NO COLOR                                                          61
     NO VERTICAL DEFLECTION                                            61
     NO ON-SCREEN DISPLAY                                              62
     NO REMOCON RECEIPT                                                62




                                           -1-
SAFETY PRECAUTIONS
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY.               SUBJECT : X-RADIATION
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC-
TURER'S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID           1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSON-
THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANT RESULT-              NEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIAL
ING PROPERTY DAMAGE OR USER INJURY.                                          SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE.
SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOR-                    HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLT-
OUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND                  AGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN
SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF                 IN THE APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLT-AGES MAY
POTENTIAL HAZARDS AND INJURY TO THE USER.                                    CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY
WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION
                                                                             AND UNDER CERTAIN CIRCUMSTANCES, AMY PRODUCE RADIA-TION IN
FROM A.C. LINE SHOCK.
                                                                             EXCESS OF DESIRABLE LEVELS.
                                                                          2. ONLY FACTORY SPECIFIED C.R.T ANODE CONNECTORS MUST BE
SAFETY CHECKS
                                                                             USED.DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN COLOR
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED, A CHECK               SETS. ALWAYS RE-INSTALL THEM.
SHOULD BE MADE OF THE FOLLOWING:                                          3. IT IS ESSENTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCU-
                                                                             RATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRATION OF THE
SUBJECT:FIRE & SHOCK HAZARD                                                  METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE
                                                                             STANDARD. SUCH AS THE ONE AVAILABLE AT YOUR DISTRIBUTOR.
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS            4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY THERE
   TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS                IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY TIME A COLOR
   ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANS-                    CHASSIS IS SERVICED, THE BRIGHTNESS SHOULD BE RUN UP AND DOWN
   PORTED TO AND FROM THE REPAIR SHOP.                                       WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAIN
2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS              THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND
   INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER              THAT IT IS REGULATING CORRECTLY. WE SUGGEST THAT YOU AND YOUR
   SUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PER                SERVICE ORGANIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE
   ORIGINAL DESIGN. BE SURE, THAT THE SAFETY PURPOSE OF THE                  REGULATION IS ALWAYS CHECKED AS A STANDARD SERVICING
   POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.                                PROCEDURE, AND THAT THE HIGH VOLTAGE READING BE RECORDED ON
3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOL-                EACH CUSTOMER'S INVOICE.
   DER JOINTS, SOLDER SPLASHES OF SHARP SOLDER POINTS. BE CER-            5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A
   TAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.
                                                                             PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID BEING
4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO
                                                                             UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE
   PARTS AND COMPONENTS, FOR FRAYED LEADS, DAMAGED INSULATION
                                                                             SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IS NECESSARY
   (INCLUDING A.C. CORD), AND REPLACE IF NECESSARY. FOLLOW ORIGI-
   NAL LAYOUT, LEAD LENGTH AND DRESS.                                        TO LOCATE THE CAUSE OF EXCESSIVE VOLTAGE.
5. NO LEAD OR COMPONENT SHOULD TOUCH A RECEIVING TUBE OR A                6. REFER TO HV, B+ AND SHUTDOWN ADJUSTMENT PROCEDURES
   RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PRO-                DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS (WHERE
   TRUDING METAL SURFACES MUST BE AVOIDED.                                   USED).
6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTOR,
   CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES.            SUBJECT : IMPLOSION
   DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECI-
   FIED OR MAKE UNRECOMMENDED CIRCUIT MODIFICATIONS.                      1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTEGRA
7. AFTER RE-ASSEMBLY OF THE STE ALWAYS PERFORM AN A.C. LEAKAGE               IMPLOSION PROTECTION SYSTEM. BUT CARE SHOULD BE TAKEN TO
   TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET. (THE CHAN-             AVOID DAMAGE DURING INSTALLATION. AVOID SCRATCHING THE TUBE.
   NEL SELECTOR KNOB, ANTENNA TERMINALS, HANDLE AND SCREWS) TO               OF SCRATCHED REPLACE IT.
   BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGER OF ELECTRI-          2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.
   CAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS
   TEST USE AN A.C. VOLTMETER, HAVING 5000 OHMS PER VOLT OR MORE          SUBJECT : TIPS ON PROPER INSTALLATION
   SENSITIVITY, IN THE FOLLOWING MANNER : CONNECT A 1500 OHM 10
   WATT RESISTOR, PARALLELED BY A .15 MFD. 150V A.C. TYPE CAPACI-         1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR
   TOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER POPE, CON-                   CLOSELY FITTING SHELF SPACE, OVER OR CLOSE TO HEAT DUCT, OR IN
   DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME.
                                                                             THE PATH OF HEATED AIR FLOW.
   MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM
                                                                          2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO
   RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND
                                                                             INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS
   REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC
   PART. VOLTAGE MEASURED MUST NOT EXCEED .75 VOLTS R.M.S THIS               WHERE STEAM LEAKAGE IS A FACTOR, ETC.
   CORRESPONDS TO 0.5 MILLIAMP A.C. NAY VALUE EXCEEDING THIS LIMIT        3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING.
   CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED                THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE
   IMMEDIATELY.                                                              SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILA-
                                                                             TION.
                                                                          4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL
                                                                             MOUNTING KIT, MUST FOLLOW THE FACTORY APPROVED MOUNTING
                               A.C. VOLTMETER
                                                                             INSTRUCTIONS. A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST
                                                                             RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPAC-
                                                                             ERS)TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS OR
                                                                             SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR
                                                                             WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS.
                                     0.15 uF
                                                                          5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON
                                                                             SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS
         GOOD EARTH GROUND                           PLACE THIS PROBE
         SUCH AS THE WATER        1500         OHM
                                                     ON EACH EXPOSED
                                                                             PROPERLY SECURED.
         PIPE, CONDUIT, ETC.
                                    10WATT           METAL PART           6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNT-
                                                                             ING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRY-
SUBJECT : GRAPHIC SYMBOLS                                                    ING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR
                   THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL,                DEEP PILE CARPETS.
                   WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO         7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH
                   ALERT THE SERVICE PERSONNEL TO THE PRES-ENCE              HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES. INC. FOR
                   OF UNINSULATED "DANGEROUS VOLTAGE"                        USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR
                   THAT MAY BE OF SUFFICIENT MAGNITUDE TO CON-               GENERICALLY APPROVED FOR USE WITH T.V.S OF THE SAME OR LARGER
                   STITUTE A RISK OF ELECTRIC SHOCK.                         SCREEN SIZE.
                                                                          8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS,
                   THE EXCLAMATION POINT WITHIN AN EQUILATERAL               EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE
                   TRIANGLE IS INTENDED TO ALERT THE SERVICE                 OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND
                   PERSONNEL TO THE PRESENCE OF IMPORTANT                    FAMILY.
                   SAFETY INFORMATION ON SERVICE LITERATURE.



                                                                        -2-
                                                                                                          SAFETY PRECAUTIONS

CAUTION : Do not attempt to modify this product in any way. Unau-                                       The lightning flash with arrowhead symbol,
thorized modifications will not only void the warranty, but may lead to your                            within an equilateral triangle, is intended to alert
being liable for any resulting property damage or user injury.                                          the service personnel to the presence of uninsu-
Service work should be performed only after you are thoroughly familiar                                 lated "dangerous voltage" that may be of suffi-
with all of the following safety checks and servicing guide-lines. To do                                cienty magnitude to constitute a risk of electric
otherwise, increases the risk of potential hazards and injury to the user.                              shock.

SAFETY CHECKS                                                                                           The exclamation point within an equilateral tri-
                                                                                                        angle is intended to alert the service personnel
After the original service problem has been corrected, a check should be                                to the presence of important safety information
made of the following:                                                                                  in service literature.

SUBJECT : FIRE & SHOCK HAZARD                                                                           Fuse symbol is printed on pcb adjacent to the
                                                                                                        fuse, with "RISK OF FIRE REPLACE FUSE AS
1. Be sure that all components are positioned in such a way as to avoid                                 MARKED". The symbol is explained in the ser-
   possibility of adjacent component shorts. This is especially important on                            vice manual with the following wording or equiv-
   those chassis which are transported to and from the repair shop.                                     alent.
2. Never release a repair unless all protective devices such as insula-tors,
   barriers, covers, shields, strain reliefs, and other hardware have been      "CAUTION : FOR CONTINUED PROTECTION AGAINST FIRE
   reinstalled per original design.                                             HAZARD, REPLACE ONLY WITH SAME TYPE (4A, 125V)" and
3. Soldering must be inspected to discover possible cold solder joints,         "ATTENTION: AFIN D'ASSU UNE PROTECTION PERMANENTE
   frayed leads, damaged insulation (including A.C. cord), solder splashes      CONTRE LES RISQUES D'INCENDIE, REMPLACER UNIQUE-MENT
   or sharp solder points. Be certain to remove all loose for-eign particals.   PAR UN FUSIBLE DE MEME TYPE ET DE "4A, 125V".
4. Check for physical evidence of damage or deterioration to parts and
   components, and replace if necessary follow original layout, lead length     SUBJECT : X-RADIATION
   and dress.
5. No leads or components should touch a receiving tube or a resistor           1. Be sure procedures and instructions to all service personnel cover
   rated at 1 watt or more. Lead tension around protruding metal sur-faces         the subject of X-rays in current T.V. receivers is the picture tube.
   must be avoided.                                                                However, this tube does not emit X-rays when the high voltage is at
6. All critical components such as fuses, flameproof resistors, capaci-tors,       the factory specified level. The proper value is given in the appli-
   etc. must be replaced with exact factory types. Do not use replacement          cable schematic. Operation at higher voltages may cause a failure
   components other than those specified or make unrecommended circuit             of the picture tube or high voltage supply and, under certain cir-
   modifications.                                                                  cumstances, may produce radiation in excess of desirable levels.
7. After re-assembly of the set always perform an A.C. leakage test on all      2. Only factory specified C.R.T. anode connectors must be used.
   exposed metallic parts of the cabinet, (the channel selector knob,              Degaussing shields also serve as X-ray shield in color sets. Always
   antenna terminals, handle and screws) to be sure the set is safe to             re-install them.
   operate without danger of electrical shock. Do not use a line isolation      3. It is essential that the serviceman has available an accurate and
   transformer during this test. Use an A.C. voltmeter, having 5000 ohms           reliable high voltage meter. The calibration of the meter should be
   per volt or more sensitivity, in the following manner : connect a 1500          checked perio - dically against a reference standard. Such as the
   ohm 10 watt resistor, paralleled by a 15 mfd. 150V A.C. type capacitor          one available at your distributor.
   between a known good earth ground (9water pipe, conduit, etc.) and           4. When the high voltage circuitry is operating properly there is no
   the exposed metallic parts, one at a time. Measure the A.C. voltage             possibility of an X-radiation problem. Every time a color chassis is
   across the combination of 1500 ohm resistor and 0.15 MFD capacitor.             serviced, the brightness should be run up and down while monitor-
   Reverse the A.C. plug and repeat A.C. voltage measurements for each             ing the high voltage with a meter to be certain that the high voltage
   exposed metallic part. Voltage measured must not exceed 0.75 volts              does not exceed the specified value and that it is regulating cor-
   R.M.S. This corresponds to 0.5 milliamp A.C. Any value exceeding this           rectly. We suggest that you and your service organization review
   limit constitutes a potential shock hazard and must be corrected imme-          test procedures so that voltage regulation is always checked as a
   diately.                                                                        standard servicing procedure. And that the high voltage reading be
                                                                                   recorded on each customer's invoice.
                                                                                5. When troubleshooting and making test measurements in a receiver
                                                                                   with a problem of excessive high voltage, avoid being unnecessarily
                                                                                   close to the picture tub eand the high voltage compartment. Do not
                             A.C. VOLTMETER                                        operate the chassis longer than is necessary to locate the cause of
                                                                                   excessive voltage.
                                                                                6. Refer to HV, B+and Shutdown adjustment procedures described in
                                                                                   the appropriate schematic and diagrams(where used).


                                      0.15 uF

   GOOD EARTH GROUND                                   PLACE THIS PROBE
   SUCH AS THE WATER              1500          OHM
                                                       ON EACH EXPOSED
   PIPE, CONDUIT, ETC.                                 METAL PART
                                     10WATT




                                                                            -3-
SAFETY PRECAUTIONS

SUBJECT : IMPLOSION                                                            4. Wall and shelf mounted installations using a commercial mounting
                                                                                  kit, must follow the factory approved mounting instructions. A
1. All direct viewed picture tubes are equipped with an integral implo-           receiver mounted to a shelf or platform must retain its original
   sion protection system, but care should be taken to avoid damage               feet(or the equivalent thickness in spacers) to provide adequate are
   during installation. Avoid scratching the tube. If scratched, replace it.      flow across the bottom, bolts or screws used for fasteners must not
2. Use only recommended factory replacement tubes.                                touch and parts or wiring. Perform leakage test on cus-tomized
                                                                                  installations.
SUBJECT : TIPS ON PROPER INSTALLATION                                          5. Caution customers against the mounting of a receiver on sloping
                                                                                  shelf or a tilted position, unless the receiver is properly secured.
1. Never install any receiver in closed-in recess, cubbyhole or closely        6. A receiver on a roll-about cart should be stable on its mounting to
   fitting shelf space over, or close to heat duct, or in the path of             the cart. Caution the customer on the hazards of trying to roll a cart
   heated air flow.                                                               with small casters across thresholds or deep pile carpets.
2. Avoid conditions of high humidity such as : Outdoor patio installa-         7. Caution customers against the use of a cart or stand which has not
   tions where dew is a factor. Near steam radiators where steam                  been listed by underwriters laboratories, inc. For use with their
   leakage is a factor, etc.                                                      specific model of television receiver or generically approved for use
3. Avoid placement where draperies may obstruct rear venting. The                 with T.V.'s of the same or larger screen size.
   customer should also avoid the use of decorative scarves or other
   coverings which might obstruct ventilation.




                                                                           -4-
SPECIFICTION

                    Model
                             DTQ-20U4SC         DTQ-2033SC         DTQ-27U4SC
 Item
 CHASSIS                                        CN-230F
 TV Standard                 NTSC-M
 Power Input                 AC 120v, 60Hz
 Power Consumption                            90W                    120W
 Tuning System               Frequency Synthesizer(FS) Tuning System
 Tuning Ranges               TV VHF(L) : CH2 - CH6
                             UHF(H) : CH7 - CH13
                             UHF : CH14 - CH69
                             CATV VHF(L) : 5A, A,B,A-5-A-1
                                                   CH2-CH6
                             VHF(H) : C-W+11
                                                   CH7 - CH13
                             UHF : W+12-W+84



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