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S/M No : TCM101S001

Service Manual
Color Television

CHSSIS MODEL
CM-101S DTH-21S7
DTH-21S8

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.

April. 2007
TABLE OF CONTENTS
SAFETY PRECAUTIONS 2
SPECIFICATIONS 3
CIRCUIT BLOCK DIAGRAM 4
ALIGNMENT INSTRUCTIONS 5
YOUR REMOTE CONTROL 5
SERVICE MODE ADJUSTMENT 6
ASSEMBLY ADJUSTMENT 8

APPENDIX(Appendix is provide only by internet[http://svc.dwe.co.kr])
IC DESCRIPTION 11
UOC III SERIES 11
LA7848_TV VERTICAL OUTPUT+ EW DRIVER 23
24WC16-16 KB EEPROM 25
LA42072N 26
STR-6754 29
WAVEFORMS 32
TROUBLE SHOOTING GUIDE 33
NO POWER 33
NO PICTURE 34
NO SOUND 35
CH DON'T MEMORY or SKIP 36
NO COLOR 37
NO VERTICAL DEFLECTION OR PINCUSHION BADNESS 37
REMOTE CONTROL DOESNOT OPERATE 38
ELECTRICAL PARTS LIST 39
PRINTED CIRCUIT BOARD 52
SCHEMATIC DIAGRAM 54
EXPLODE VIEW 56

-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-
SPECIFICTION

Model
Item DTH-21S7 / 21S8

CHASSIS CM-101S
TV Standard NTSC-M, PAL-N, PAL-M
Power Input AC 220V, 50/60Hz
Power Consumption 80W
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