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
DTH-20V4FC
POWER
MUTE
CH
VOLVOL
CH
DISPLAY INPUT VIDEO
1 2 3
4 5 6
7 809
SLEEP PREVIOUS
R-38T01
Specifications
Model Name
Screen Size14"20"21"
Channel Coverage
Power Source
Power Consumption
Set Dimensions
(W H D)
Net Weight
Stuffing Q'th(48ft)
DTH-14V1/V3/V4FSDTH-20V1/V3/V4FSDTH-21V1/V3/V4FS
VHF 2-13
UHF 14-69
113 Cable Ch.
AC 100-260, 50/60HzAC 100-260, 50/60HzAC 100-260, 50/60Hz
1) Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not be above the specified limit. The nominal value of the high voltage of this receiver is
25.5kv(20”/21”) & 23.5kv(14”)at zero beam current (minimum brightness)
under a 120V/220V AC power source. The high voltage must not, under any
circumstances, exceed 28kv(20”/21”) & 26kv(14”). Each time a receiver
requires servicing, the high voltage should be checked following the HIGH
VOLTAGE CHECK procedure on page 10 of this manual. It is recommended 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, XRADIATION PROTECTION circuit must be checked to determine that the
circuit is properly functioning, following the X-RADIATION PROTECTION
CIRCUIT CHECK procedure on page 6 of this manual.
3) The only source of X-RAY RADIATION in this TV receiver is the picture tube.
For continued X-RAY RADIATION protection, the replacement tube must
be exactly the same type tube as specified in the parts list.
4) Some parts in this receiver have special safety-related characteristics for XRAY RADIATION protection. For continued safety, parts replacement
should be undertaken only after referring to the PRODUCT SAFETY
NOTICE below.
2. Safety Precaution
WARNING: Service should not be attempted by anyone unfamiliar with the
necessary precaution on this receiver. The following are the necessary precaution to be observed before servicing.
1) Since the chassis of this receiver has hazardous potential to ground whenever the receiver is plugged in (floating chassis), an isolation transformer
must be used during servicing to avoid shock hazard.
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 fragments will be violently expelled. Use shatterproof goggles and keep picture
tube away from the body while handling.
3) When placing chassis in the cabinet, always be certain that all the protective
devices are put back in place, such as; nonmetallic control knobs, insulating covers, shields, isolation resistor-capacitor network, etc.
4) Before returning the set to the customer, always perform an AC leakage current 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
is safe to operate without danger of electrical shock. Plug the AC line cord
directly into a 120V AC outlet (do not use a line isolation transformer during
this check). Use an AC voltmeter having 5000 ohms per volt or more sensitivi-ty in the following manner.
Connect at 1500 ohm 10 watt resistor, paralleled by a 0.15 mfd. AC type
capacitor, between a known good earth ground (water pipe, conduit etc.)
and the exposed metallic parts, one at a time. Measure the AC voltage
across the combination of 1500 ohm resistor and 0.15 mfd capacitor. Voltage measured must not exceed 0.3 volts RMS. This corresponds to 0.2 millliamp. AC. Any value exceeding the limit constitutes a potential shock
hazard and must be corrected immediately.
AC VOLT METER
0.15MFD
Place this probe
on each exposed
metallic part.
Good earth ground
such as d water
pipe, conduit, etc.
1500 ohm
10watt
3. Product Safety Notice
Many electrical and mechanical parts in this chassis have special safety-related
characteristics. These characteristics are often passed unnoticed by a visual
inspection and the protection afforded by them cannot necessarily be obtained
by using replacement components rated for higher voltage, wattage, etc.
Replacement parts which have these special safety characteristics are identified in this manual and its supplements; electrical components having such features 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
carefully. The use of substitute replacement parts which do not have the same
safety characteristics as specified in the parts list may create X-ray radiation or
other hazards.
4. Service Notes
1) When replacing parts or circuit boards, clamp or bend the lead wires to terminals before soldering.
2) When replacing a high wattage resistor (metal oxide film resistor) in the circuit board, keep the resistor min 1/2 inch away form circuit board.
3) Keep wires away from high voltage or high temperature components.
DAEWOO ELECTRONICS CO., LTD.
C.P.OBOX8003 SEOUL, KOREA
Tel : 82-2-360-8179
Fax : 82-2-360-8184
E-mail : G7F00E@dwe.web.co.kr
Printed in Nov. 1998
Parts Location on Main Board(Solder Side)
T
S
R
Q
P
O
N
M
L
K
J
I
H
G
F
E
D
C
B
A
Y
2
47
911
1215
161920135681013141718
X
LOCXY
CONDENSOR
C1012P
C1022 Q
C1032 R
C1045 O
C1055 P
C1065 N
C1075 N
C3017 Q
C3025 Q
C3037 P
C3055 R
C3076 P
C3087 P
C3108 Q
C3117 Q
C40115 L
C40317 L
C40418 N
C40513 M
C40615 M
C4089 N
C41010 Q
C41110 S
C41212 R
C41312 S
C4149 R
C41510 R
C41612 Q
C41711 S
C41814 S
C45110 P
C45210 Q
C5016 N
C5025 L
C5075 K
C5082 L
C5095 L
C5105 K
C5115 K
C5122 P
C5132 N
C5143 M
C5152 M
C5162 M
C5173 L
C5182 O
C5193 K
C5203 K
C5214 K
C5233 K
C5242 P
C5252 N
C6015 O
C6022 J
C6033 G
C6043 H
C6053 H
C7019 B
C7028 F
C7039 D
C7048 D
C7058 E
C70614 C
C70713 D
C7088 D
C80116 D
C80214 F
C80317 H
C80417 J
C80513 I
C80612 J
C8129 I
C8139 K
C81411 M
C8158 L
C81810 N
C8198 N
C82012 P
C82613 B
C83210 I
C88014 K
C88111 H
C9023 B
C9053 B
C9651 C
CC1513 R
CC1525 O
CC1534 N
CC1544 N
CC1554 N
CC5283 N
CC5514 M
CC5524 M
CC5563 O
CC5583 N
LOCXY
CC5604 M
CC5623 L
CC5644 M
CC5654 L
CC5674 K
CC5684 L
CC5693 O
CC5705 M
CC5715 M
CC5735 M
CC5744 M
CC5754 L
CC5774 M
CC5784 M
CC5794 M
CC5803 O
CC5824 L
CC6623 G
CC6632 I
CC7527 G
CC7538 G
CC7547 F
CC7557 F
CC7569 C
CC7577 F
CC7586 G
CC7596 G
CC7606 G
CC7617 G
CC7627 G
CC7657 H
CC7667 H
CC7677 F
CC7686 F
CC7808 C
CC80111 J
CC9002 B
CCA017 B
CCA024 M
DIODE
D1014 Q
D1054 Q
D3016 R
D40114 L
D40418 N
D40512 Q
D40612 S
D40712 R
D40812 R
D40919 K
D5016 N
D5028 K
D5034 R
D5048 J
D5054 R
D7019 E
D70311 A
D7049 E
D75710 D
D80115 F
D80710 L
D8089 L
D81213 C
D8139 J
D82210 L
IC
I1015 O
I3016 Q
I4019 P
I6012 I
I7018 H
I7038 D
I80111 G
I9012 A
IL70110 A
COIL
L1114 P
L1126 O
L40113 N
L5013 N
L5024 O
L5332 N
L70111 E
L80013 F
L80115 D
L80213 I
L80511 P
L80710 K
L8089 K
TRANSISTOR
Q40115 L
Q40218 L
Q4039 N
Q5038 L
Q6013 I
Q70110 D
LOCXY
Q70210 D
Q7039 D
Q7049 E
Q70612 C
Q70713 C
Q80114 J
Q80411 N
Q80512 D
QV019 B
RESISTOR
R3017 R
R3028 R
R3038 R
R3058 R
R3526 Q
R3537 Q
R40115 L
R40214 M
R40314 L
R40514 L
R41113 Q
R41213 S
R41313 R
R41413 R
R41618 L
R41810 P
R4199 Q
R4204 R
R4259 M
R45110 S
R4524 S
R5018 J
R5026 K
R5116 M
R5157 D
R5556 N
R6012 I
R6026 B
R6044 H
R6056 I
R70110 B
R70811 D
R70914 C
R71211 D
R7369 E
R74313 C
R74414 C
R74614 C
R74715 C
R75011 C
R77511 C
R77611 B
R7807 D
R7857 E
R7892 R
R7902 R
R7999 F
R80115 G
R801A16 G
R80215 H
R80314 H
R80415 I
R80513 G
R80917 H
R81310 O
R81411 O
R81713 D
R81813 D
R8207 N
R8229 M
R88016 K
R88319 H
R88816 B
R9103 C
R9112 C
R9123 C
R9133 B
R9142 B
R9151 B
RC1055 M
RC1113 P
RC1505 O
RC1515 O
RC1545 N
RC1564 N
RC1656 O
RC3517 P
RC3598 Q
RC3608 Q
RC3618 Q
RC3627 Q
RC4268 M
RC4539 N
RC45414 L
RC45514 L
RC5037 N
LOCXY
RC5067 K
RC5077 L
RC5087 J
RC5097 I
RC5102 N
RC5202 M
RC5253 L
RC5264 L
RC5303 M
RC5313 M
RC5332 N
RC5547 N
RC5575 K
RC5583 O
RC5592 O
RC5613 N
RC5624 N
RC5632 L
RC5653 J
RC5663 J
RC5674 L
RC5684 K
RC5694 J
RC5704 K
RC5714 L
RC5724 K
RC5734 L
RC6552 G
RC6563 H
RC7038 C
RC7046 H
RC7057 I
RC7067 I
RC7076 H
RC73110 C
RC7326 H
RC7336 G
RC7345 G
RC7356 F
RC7379 E
RC73810 E
RC7407 E
RC7518 C
RC7528 B
RC7568 G
RC7598 H
RC76212 C
RC76311 B
RC7668 K
RC7708 H
RC7819 C
RC7827 F
RC7848 F
RC7867 G
RC7878 B
RC7888 B
RC7908 G
RC7915 F
RC7925 G
RC7935 G
RC7945 G
RC79510 D
RC79610 D
RC79710 C
RC86113 B
RC8628 N
RC9132 B
RC9142 B
RC9151 B
RC9232 A
RC9242 A
RC9251 A
RCA017 B
RCA027 B
RCA032 M
RCA041 M
RCV028 B
RLY119 K
RS80119 D
OTHERS
SF1015 Q
SW70118 A
SW70217 A
SW70316 A
SW70414 A
SW70513 A
SW70612 A
SW80119 D
SW80218 D
T40116 L
T40216 Q
T80111 K
U1023 S
X5023 L
XC7018 G
Z5012 O
Alignment Instructions
1. Service Mode Adjustments
Follow the steps below whenever service adjustment is required. See Table- A and Table- B to determine if
service adjustments are required.
1) How to enter the service mode using the user remote control.
• Turn the set on.
• Direct the remote control to the reception window of TV.
• Push buttons of remote control in sequence as follows.
• Using the channel up or channel down button, select the item you wish to adjust.
(The color of selected item turns into the red.)
• Press the volume up or down button to enter in the service mode you wish to adjust.
2) How to memorize the adjusted values in the service mode.
• Must press DISPLAY button the state which the screen is displaying each of service menus
after all adjustments are completed each of all service menu.
TABLE-A
TABLE-B
MODEADJUSTMENT ITEMS
S2Screen Adjustment--
Auto RF AGC-Video Level (VIDEOL)70 ~ 7 Must be set to 7
RF AGC Delay (RFAGCD)*0 ~ 63Align RF AGC threshold
FM Level (FM.LEV)80 ~ 31Must be set to 8
S5
S6
S7
S8
S9
S12Forwarding Mode-Factory Initialization
AGC Point3.75-Select AGC reference voltage
A/D VALUE-Horizontal Phase(H.PHASE)*0 ~ 31Align sync to flyback pulse
Vertical Position (V.POSI)*0 ~ 63Align vertical DC bias
Vertical Size (V.SIZE)*0 ~ 127Align vertical amplitude
NO SD POWER OFFYES-Automatically turn off in 15min for no received signal.
Vertical S-Correction (V SC)00 ~ 31Must be set to 0
Vertical Linearity (V LIN)160 ~ 31Must be set to 16
Internal Black --Display internal BLACK pattern
Internal 100% White--Display internal 100% WHITE
Internal 60% White--Display internal 60% WHITE
Internal Cross Pattern--Display internal CROSS pattern
Red Drive (RD)*0 ~ 127Align RED OUT AC level
Green Drive (GD)100 ~ 15Must be set to 10
Blue Drive (BD)*0 ~ 127Align BLUE OUT AC level
Red Bias (RB)*0 ~ 255Align RED OUT DC level
Green Bias (GB)*0 ~ 255Align GREEN OUT DC level
Blue Bias (BB)*0 ~ 255Align BLUE OUT DC level
Subbrightness*0 ~ 127Align common RGB DC level
Contrast270 ~ 27
Tint150 ~ 27
Color270 ~ 27
INITIAL RANGE
DATA
REMARKS
PART REPLACED
NECESSARYUNNECESSARY
I701
(U-COM)
I101
(MAIN)
I703 (EEPROM)O
CRTOAdjust items related to picture tube only.
ADJUSTMENT
Data is stored in I703.
O
O
Initial setting values are written from I701.
Adjusting Items
C403 CEXF2C109V C ELECTRO160V RSS 1MF (6.3X11) TP
C404 CMYH3C662H C MYLAR1.6KV BUP 6600PF H
C405 CEXF2C109V C ELECTRO160V RSS 1MF (6.3X11) TP
C406 CMYE2D514J C MYLAR200V PU 0.51MF J
C410 CEXF2E100V C ELECTRO250V RSS 10MF (10X20) TP
C411 CEXF1H100V C ELECTRO50V RSS 10MF (5X11) TP
C412 CCXB2H102K C CERA500V B 1000PF K (TAPPING)
C413 CCXB2H102K C CERA500V B 1000PF K (TAPPING)
C414 CEXF1V471V C ELECTRO35V RSS 470MF (10X20) TP
C415 CEXF1C102V C ELECTRO16V RSS 1000MF (10X20) TP
C416 CCXB2H102K C CERA500V B 1000PF K (TAPPING)
C417 CCXB2H102K C CERA500V B 1000PF K (TAPPING)
C801 CL1UC3104M C LINE ACROSSWORLD AC250V 0.1UF M R.47
C802 CCXB2H222K C CERA500V B 2200PF K (TAPPING)
C803 CCXB2H222K C CERA500V B 2200PF K (TAPPING)
C804 CEYN2E221P C ELECTRO250V LHS 220MF (22X30)
C805 CMYU3A472J C MYLAR1KV BCP 4700PF J
C806 CCXB3A102K C CERA1KV B 1000PF K (TAPPING)
C812 CEXF1C102V C ELECTRO16V RSS 1000MF (10X20) TP
C813 CBXB3D471K C CERA SEMI2KV BL(N) 470PF K (T)
C814 CEXF2C101V C ELECTRO160V RSS 100MF (16X25) TP
C815 CEXF2A100V C ELECTRO100V RSS 10MF (6.3X11) TP
C818 CEXF1C101V C ELECTRO16V RSS 100MF (6.3X11) TP
C819 CEXF1H479V C ELECTRO50V RSS 4.7MF (5X11) TP
C820 CEXF2C101V C ELECTRO160V RSS 100MF (16X25) TP
C832 CBXB3D471K C CERA SEMI2KV BL(N) 470PF K (T)
C880 CH1BFE222M C CERA ACU/C/V AC400V 2200PF
C881 CH1HFE102M C CERA AC4.0KV 1000PF E DG
C902 CMXL2E104K C MYLAR250V MEU 0.1MF K
C905 CMXL1J224JC MYLAR63V MEU 0.22MF J (TP)
C965 CCXB3D102K C CERA2KV B 1000PF K (TAPPING)
D101 DUZ33B----DIODE ZENERUZ-33B
D301 D1N4003---DIODE1N4003 (TAPPING)
D401 D1N4937GP-DIODE1N4937GP (TAPPING)
Q804 TKSA1013Y-TRKSA1013Y (TP)
Q805 TKTC3205Y-TRKTC3205Y (TP)
R301 RN01B471JS R METAL FILM1W 470 OHM J SMALL
R302 RN01B471JS R METAL FILM1W 470 OHM J SMALL
R303 RN01B209JS R METAL FILM1W 2 OHM J SMALL
R305 RN01B331JS R METAL FILM1W 330 OHM J SMALL
R352 RD-4Z104J-R CARBON FILM1/4 100K OHM J
R353 RD-4Z103J-R CARBON FILM1/4 10K OHM J
R401 RD-4Z472J-R CARBON FILM1/4 4.7K OHM J
R403 RN01B562JS R METAL FILM1W 5.6K OHM J SMALL
R405 RD-2Z751J-R CARBON FILM1/2 750 OHM J
R411 RN01B229JS R METAL FILM1W 2.2 OHM J SMALL
R412 RN01B479JS R METAL FILM1W 4.7 OHM J SMALL
R413 RN01B229JS R METAL FILM1W 2.2 OHM J SMALL
R414 RN01B229JS R METAL FILM1W 2.2 OHM J SMALL
R416 RD-2Z121J-R CARBON FILM1/2 120 OHM J
R418 RN02B150JS R METAL FILM2W 15 OHM J SMALL
R420 RN02B620JS R METAL FILM2W 62 OHM J SMALL
R501 RD-2Z151J-R CARBON FILM1/2 150 OHM J
R502 RD-2Z151J-R CARBON FILM1/2 150 OHM J
R601 RN01B229JS R METAL FILM1W 2.2 OHM J SMALL
R801 RX07C229JFR CEMENT7W 2.2 0HM J 15MM 4P
R804 RS02Z278JSR M-OXIDE FILM2W 0.27 OHM J SMALL
R814 RS02Z828JSR M-OXIDE FILM2W 0.82 OHM J SMALL
LOCPART CODEPART NAMEDESCRIPTION
R817 RN01B301JSR METAL FILM1W 300 OHM J SMALL
R883 DEC7R0M140 POSISTORECPAC7R0M140
R888 RC-2Z565KPR CARBON COMP1/2 5.6M OHM K
R910 RD-2Z152J-R CARBON FILM1/2 1.5K OHM J
R911 RD-2Z152J-R CARBON FILM1/2 1.5K OHM J
R912 RD-2Z152J-R CARBON FILM1/2 1.5K OHM J
R913 RN01B124JSR METAL FILM1W 120K OHM J SMALL
R914 RN01B124JSR METAL FILM1W 120K OHM J SMALL
R915 RN01B124JSR METAL FILM1W 120K OHM J SMALL
RLY1 5SC0101338SW RELAYDQ5D1-O(M)