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S/G No. : CM003P-010G1
Service Guide
Color Television
CHASSIS : CM-003
Model : DTH-14V1FS
DTH-20V1FS
DTH-21V1FS
DTH-14V3FS
DTH-20V3FS
DTH-21V3FS
DTH-14V4FS
DTH-20V4FS
DTH-21V4FS
POWER
MUTE
CH
VOL VOL
CH
DISPLAY INPUT VIDEO
1 2 3
4 5 6
7 8 9
SLEEP 0 PREVIOUS
DTH-14V1FC DTH-14V3FC DTH-20V4FC R-38T01
Features
181CH quartz frequency synthesis tuning system
On-Screen Display(Simple Icon Type/Trilingual : Eug/Span/Fren)
Programmable channel skip memory
24 hour programmable TV on/off function
Convenient sleep timer
Built-in Closed Caption
Full function infrared remote control
Specifications
Model Name DTH-14V1/V3/V4FS DTH-20V1/V3/V4FS DTH-21V1/V3/V4FS
Screen Size 14" 20" 21"
VHF 2-13 VHF 2-13 VHF 2-13
Channel Coverage UHF 14-69 UHF 14-69 UHF 14-69
113 Cable Ch. 113 Cable Ch. 113 Cable Ch.
Power Source AC 100-260, 50/60Hz AC 100-260, 50/60Hz AC 100-260, 50/60Hz
Power Consumption 63W 70W 73W
Set Dimensions
336 x 338 x 376(mm) 496x446(2)(2)x464(4)(3)(mm) 516x469(6)(4)x482(6)(2)(mm)
(W H D)
Net Weight 8.7Kg 16.3Kg 19Kg
Stuffing Q'th(48ft) 1100Set 540Set
DAEWOO ELECTRONICS CO., LTD
http : //svc.dwe.co.kr Sep. 1999
Important Service Notes
1. X-ray Radiation Rrecaution Connect at 1500 ohm 10 watt resistor, paralleled by a 0.15 mfd. AC type
1) Excessive high voltage can produce potentially hazardous X-RAY RADIA- capacitor, between a known good earth ground (water pipe, conduit etc.)
TION. To avoid such hazards, the high voltage must not be above the spec- and the exposed metallic parts, one at a time. Measure the AC voltage
ified limit. The nominal value of the high voltage of this receiver is across the combination of 1500 ohm resistor and 0.15 mfd capacitor. Volt-
25.5kv(20" ) & 23.5kv(14" zero beam current (minimum brightness)
/21" )at age measured must not exceed 0.3 volts RMS. This corresponds to 0.2 mill-
under a 120V/220V AC power source. The high voltage must not, under any liamp. AC. Any value exceeding the limit constitutes a potential shock
circumstances, exceed 28kv(20" ) & 26kv(14" Each time a receiver
/21" ). hazard and must be corrected immediately.
requires servicing, the high voltage should be checked following the HIGH
VOLTAGE CHECK procedure on page 10 of this manual. It is recom- AC VOLT METER
mended as a parts of the service record. It is important to use an accurate
and reliable high voltage meter.
2) This receiver is equipped with X-RADIATION PROTECTION circuit which
prevents the receiver from producing an excessively high voltage even if the
B+voltage increases abnormally. Each time the receiver is serviced, X-
RADIATION PROTECTION circuit must be checked to determine that the
0.15MFD
circuit is properly functioning, following the X-RADIATION PROTECTION
CIRCUIT CHECK procedure on page 6 of this manual. Place this probe
1500 ohm
3) The only source of X-RAY RADIATION in this TV receiver is the picture tube. Good earth ground 10watt on each exposed
metallic part.
For continued X-RAY RADIATION protection, the replacement tube must such as d water
pipe, conduit, etc.
be exactly the same type tube as specified in the parts list.
4) Some parts in this receiver have special safety-related characteristics for X-
RAY RADIATION protection. For continued safety, parts replacement 3. Product Safety Notice
should be undertaken only after referring to the PRODUCT SAFETY Many electrical and mechanical parts in this chassis have special safety-related
NOTICE below. characteristics. These characteristics are often passed unnoticed by a visual
inspection and the protection afforded by them cannot necessarily be obtained
2. Safety Precaution by using replacement components rated for higher voltage, wattage, etc.
WARNING: Service should not be attempted by anyone unfamiliar with the Replacement parts which have these special safety characteristics are identi-
necessary precaution on this receiver. The following are the necessary precau- fied in this manual and its supplements; electrical components having such fea-
tion to be observed before servicing. tures are identified by shading on the schematic diagram and the parts list.
Before replacing any of these components, read the parts list in this manual
1) Since the chassis of this receiver has hazardous potential to ground when- carefully. The use of substitute replacement parts which do not have the same
ever the receiver is plugged in (floating chassis), an isolation transformer safety characteristics as specified in the parts list may create X-ray radiation or
must be used during servicing to avoid shock hazard. other hazards.
2) Always discharge the picture tube anode to the CRT conductive coating the
picture tube. The picture tube is highly evacuated and if broken, glass frag- 4. Service Notes
ments will be violently expelled. Use shatterproof goggles and keep picture 1) When replacing parts or circuit boards, clamp or bend the lead wires to termi-
tube away from the body while handling. nals before soldering.
3) When placing chassis in the cabinet, always be certain that all the protective 2) When replacing a high wattage resistor (metal oxide film resistor) in the cir-
devices are put back in place, such as; nonmetallic control knobs, insulat- cuit board, keep the resistor min 1/2 inch away form circuit board.
ing covers, shields, isolation resistor-capacitor network, etc. 3) Keep wires away from high voltage or high temperature components.
4) Before returning the set to the customer, always perform an AC leakage cur-
rent check on the exposed metallic parts of the cabinet, such as antennas,
terminals, screw-heads, metal overlays, control shafts etc. to be sure the set
DAEWOO ELECTRONICS CO., LTD.
is safe to operate without danger of electrical shock. Plug the AC line cord C.P.OBOX8003 SEOUL, KOREA
directly into a 120V AC outlet (do not use a line isolation transformer during Tel : 82-2-360-8179
Fax : 82-2-360-8184
this check). Use an AC voltmeter having 5000 ohms per volt or more sensi-
E-mail : [email protected]
tivi-ty in the following manner. Printed in Nov. 1998
Parts Location on Main Board(Solder Side)
T
LOC X Y LOC X Y LOC X Y LOC X Y
CONDENSOR CC560 4 M Q702 10 D RC506 7 K
C101 2 P CC562 3 L Q703 9 D RC507 7 L
S C102 2 Q CC564 4 M Q704 9 E RC508 7 J
C103 2 R CC565 4 L Q706 12 C RC509 7 I
C104 5 O CC567 4 K Q707 13 C RC510 2 N
C105 5 P CC568 4 L Q801 14 J RC520 2 M
C106 5 N CC569 3 O Q804 11 N RC525 3 L
R C107 5 N CC570 5 M Q805 12 D RC526 4 L
C301 7 Q CC571 5 M QV01 9 B RC530 3 M
C302 5 Q CC573 5 M RESISTOR RC531 3 M
C303 7 P CC574 4 M R301 7 R RC533 2 N
C305 5 R CC575 4 L R302 8 R RC554 7 N
Q C307 6 P CC577 4 M R303 8 R RC557 5 K
C308 7 P CC578 4 M R305 8 R RC558 3 O
C310 8 Q CC579 4 M R352 6 Q RC559 2 O
C311 7 Q CC580 3 O R353 7 Q RC561 3 N
C401 15 L CC582 4 L R401 15 L RC562 4 N
P C403 17 L CC662 3 G R402 14 M RC563 2 L
C404 18 N CC663 2 I R403 14 L RC565 3 J
C405 13 M CC752 7 G R405 14 L RC566 3 J
C406 15 M CC753 8 G R411 13 Q RC567 4 L
C408 9 N CC754 7 F R412 13 S RC568 4 K
O C410 10 Q CC755 7 F R413 13 R RC569 4 J
C411 10 S CC756 9 C R414 13 R RC570 4 K
C412 12 R CC757 7 F R416 18 L RC571 4 L
C413 12 S CC758 6 G R418 10 P RC572 4 K
N C414 9 R CC759 6 G R419 9 Q RC573 4 L
C415 10 R CC760 6 G R420 4 R RC655 2 G
C416 12 Q CC761 7 G R425 9 M RC656 3 H
C417 11 S CC762 7 G R451 10 S RC703 8 C
C418 14 S CC765 7 H R452 4 S RC704 6 H
M C451 10 P CC766 7 H R501 8 J RC705 7 I
C452 10 Q CC767 7 F R502 6 K RC706 7 I
C501 6 N CC768 6 F R511 6 M RC707 6 H
C502 5 L CC780 8 C R515 7 D RC731 10 C
C507 5 K CC801 11 J R555 6 N RC732 6 H
L C508 2 L CC900 2 B R601 2 I RC733 6 G
C509 5 L CCA01 7 B R602 6 B RC734 5 G
C510 5 K CCA02 4 M R604 4 H RC735 6 F
C511 5 K DIODE R605 6 I RC737 9 E
C512 2 P D101 4 Q R701 10 B RC738 10 E
K C513 2 N D105 4 Q R708 11 D RC740 7 E
C514 3 M D301 6 R R709 14 C RC751 8 C
C515 2 M D401 14 L R712 11 D RC752 8 B
C516 2 M D404 18 N R736 9 E RC756 8 G
C517 3 L D405 12 Q R743 13 C RC759 8 H
J C518 2 O D406 12 S R744 14 C RC762 12 C
C519 3 K D407 12 R R746 14 C RC763 11 B
C520 3 K D408 12 R R747 15 C RC766 8 K
C521 4 K D409 19 K R750 11 C RC770 8 H
I C523 3 K D501 6 N R775 11 C RC781 9 C
C524 2 P D502 8 K R776 11 B RC782 7 F
C525 2 N D503 4 R R780 7 D RC784 8 F
C601 5 O D504 8 J R785 7 E RC786 7 G
C602 2 J D505 4 R R789 2 R RC787 8 B
H C603 3 G D701 9 E R790 2 R RC788 8 B
C604 3 H D703 11 A R799 9 F RC790 8 G
C605 3 H D704 9 E R801 15 G RC791 5 F
C701 9 B D757 10 D R801A 16 G RC792 5 G
C702 8 F D801 15 F R802 15 H RC793 5 G
G C703 9 D D807 10 L R803 14 H RC794 5 G
C704 8 D D808 9 L R804 15 I RC795 10 D
C705 8 E D812 13 C R805 13 G RC796 10 D
C706 14 C D813 9 J R809 17 H RC797 10 C
C707 13 D D822 10 L R813 10 O RC861 13 B
F C708 8 D IC R814 11 O RC862 8 N
C801 16 D I101 5 O R817 13 D RC913 2 B
C802 14 F I301 6 Q R818 13 D RC914 2 B
C803 17 H I401 9 P R820 7 N RC915 1 B
C804 17 J I601 2 I R822 9 M RC923 2 A
E C805 13 I I701 8 H R880 16 K RC924 2 A
C806 12 J I703 8 D R883 19 H RC925 1 A
C812 9 I I801 11 G R888 16 B RCA01 7 B
C813 9 K I901 2 A R910 3 C RCA02 7 B
D C814 11 M IL701 10 A R911 2 C RCA03 2 M
C815 8 L COIL R912 3 C RCA04 1 M
C818 10 N L111 4 P R913 3 B RCV02 8 B
C819 8 N L112 6 O R914 2 B RLY1 19 K
C820 12 P L401 13 N R915 1 B RS801 19 D
C C826 13 B L501 3 N RC105 5 M OTHERS
C832 10 I L502 4 O RC111 3 P SF101 5 Q
C880 14 K L533 2 N RC150 5 O SW701 18 A
C881 11 H L701 11 E RC151 5 O SW702 17 A
C902 3 B L800 13 F RC154 5 N SW703 16 A
B C905 3 B L801 15 D RC156 4 N SW704 14 A
C965 1 C L802 13 I RC165 6 O SW705 13 A
CC151 3 R L805 11 P RC351 7 P SW706 12 A
CC152 5 O L807 10 K RC359 8 Q SW801 19 D
CC153 4 N L808 9 K RC360 8 Q SW802 18 D
A CC154 4 N TRANSISTOR RC361 8 Q T401 16 L
Y CC155 4 N Q401 15 L RC362 7 Q T402 16 Q
CC528 3 N Q402 18 L RC426 8 M T801 11 K
CC551 4 M Q403 9 N RC453 9 N U102 3 S
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 CC552 4 M Q503 8 L RC454 14 L X502 3 L
CC556 3 O Q601 3 I RC455 14 L XC701 8 G
X CC558 3 N Q701 10 D RC503 7 N Z501 2 O
Alignment Instructions TABLE-B
DATA
MODE ADJUSTMENT ITEMS REMARKS
1. Service Mode Adjustments INITIAL RANGE
Follow the steps below whenever service adjustment is required. See Table- A and Table- B to determine if S2 Screen Adjustment - -
service adjustments are required. Auto RF AGC - -
Video Level (VIDEOL) 7 0~7 Must be set to 7
1) How to enter the service mode using the user remote control. RF AGC Delay (RFAGCD) * 0 ~ 63 Align RF AGC threshold