SC-120.pdf part of Daewoo SC-120 SC-120.pdf, Daewoo Ņhassis SC SC-120 SC-120.pdf text manual preview

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S/M No. : DSC120BEF0

Service Manual
Release 1
HDTV Monitor
Chassis : SC-120

Model : DSC-34W70N

Specification

Power Requirement AC 120V, 60Hz
Power Consumption 210watts
General Dimensions(W/H/D) 41"W x 26.2"H x 24.6"D
Weight 81Kg (178.61bs)
Antenna One 75ohm external input terminal for
UHF/VHF/Cable

Screen Size 34"(diagonal), 16:9 Aspect Ratio
Picture Display Format DTV : 1080I @ 33.75KHz
NTSC/DVD : 480p @ 31.5KHz
Horizontal Resolution 800 Lines

Sound System Dolby Pro Logic
Sound NTSC Audio Multi CH TV Stereo(MTS) /
Second Audio Program(SAP)
Audio Power 8W/ch (Main L/R), 5W/ch (Center)

Rear
RF Antenna Input
NTSC A/V In 2each (Video/L/R)
1each (S-Video/Video/L/R)
NTSC A/V Monitor Out 1each (Video/L/R)
Inputs/ HD Component In 1each (Y/Pb/Pr)
Output DVD Component In 1each (Y/Cb/Cr)
Surround Channel Out 1each (SL/SR)
Sub woofer Out 1each
Side
NTSC A/V In 1each (S-Video/Video/L/R)
Headphone 1each (L/R)

DAEWOO ELECTRONICS CO., LTD.
http : // svc.dwe.co.kr Nov. 2001
1. Product Safety 2
2. Specifications 4
3. Remote Control Overview 5
4. Limited Warranty 6
5. Service Mode 7
6. General Adjustment 10
7. Special Adjustment (When replacing new circuits boards) 15
8. Troubleshooting Charts 16
9. Parts List 25
10. Circuit Diagram
10-1. Power Circuit 47
10-2. Main Circuit 48
10-3. Audio Circuit 49
10-4. 3D Comb Filter Circuit 50
10-5. Main Video Circuit 51
10-6. Sub Video Circuit 52
10-7. Scan Rate Converter Circuit 53
10-8. RGB Processor Circuit 54
10-9. AV Circuit 55
10-10. Union Circuit 56
10-11. Signal Flow Diagram 57
11. Exploded View 58

-1-
1.PRODUCT SAFETY SERVICING GUIDELINES FOR COLOR TELEVISION RECEIVERS
CAUTION : Do not attempt to modify this product in any way. GRAPHIC SYMBOLS :
Unau-thorized modifications will not only void the warranty, but The lightning flash with arrowhead symbol,
may lead to your being liable for any resulting property damage within an equilateral triangle, is intended to
or user injury. Service work should be performed only after you alert the service personnel to the presence of
are thoroughly familiar with all of the following safety checks uninsulated "dangerous voltage" that may be
and servicing guide-lines. To do otherwise, increases the risk of of sufficiency magnitude to constitute a riskof
potential hazards and injury to the user. electric shock.

SAFETY CHECKS
After the original service problem has been corrected, a check The exclamation point within an equilateral
should be made of the following: triangle is intended to alert the service perso-
nnel to the presence of important safety
SUBJECT : FIRE & SHOCK HAZARD information in service literature.
1. Be sure that all components are positioned in such a way as
to avoid possibility of adjacent component shorts. Fuse symbol is printed on pcb adjacent to the
This is especially important on those chassis which are fuse, with "RISK OF FIRE REPLACE FUSE
transported to and from the repair shop. AS MARKED". The symbol is explained in the
2. Never release a repair unless all protective devices such as service manual with the following wording or
insulators, barriers, covers, shields, strain relief, and other equivalent.
hardware have been reinstalled per original design.
3. Soldering must be inspected to discover possible cold solder CAUTION : FOR CONTINUED PROTECTION AGAINST
joints, frayed leads, damaged insulation (including A.C. cord), FIRE HAZARD, REPLACE ONLY WITH SAME TYPE (6.3A,
solder splashes or sharp solder points. Be certain to remove 125V)" and
all loose foreign particials. "ATTENTION: AFIN D' ASSU UNE PROTECTION
4. Check for physical evidence of damage or deterioration to PERMANENTE CONTRE LES RISQUES D' INCENDIE,
parts and components, and replace if necessary follow REMPLACER UNIQUE-MENT PAR UN FUSIBLE DE MEME
original layout, lead length and dress. TYPE ET DE "6.3A, 125V".
5. No leads or components should touch a receiving tube or a
resistor rated at 1 watt or more. Lead tension around SUBJECT : X-RADIATION
protruding metal surfaces must be avoided.
6. All critical components such as fuses, flameproof resistors, 1. Be sure procedures and instructions to all service
capacitors, etc. must be replaced with exact factory types. personnel cover the subject of X-rays in current T.V.
Do not use replacement components other than those receivers is the picture tube. However, this tube does not
specified or make unrecommended circuit modifications. emit X-rays when the high voltage is at the factory
7. After re-assembly of the set always perform an A.C. leakage specified level. The proper value is given in the appli-
test on all exposed metallic parts of the cabinet, (the channel cable schematic. Operation at higher voltages may cause
selector knob, antenna terminals, handle and screws) to be a failure of the picture tube or high voltage supply and,
sure the set is safe to operate without danger of electrical under certain circumstances, may produce radiation in
shock. Do not use a line isolation transformer during this test. excess of desirable levels.
Use an A.C. voltmeter, having 5000 ohms per volt or more 2. Only factory specified C.R.T. anode connectors must be
sensitivity, in the following manner : connect a 1500 ohm 10 used. Degaussing shields also serve as X-ray shield in
watt resistor, paralleled by a 15 mfd. 150V A.C. type color sets. Always re-install them.
capacitor between a known good earth ground (9water pipe, 3. It is essential that the serviceman has available an
conduit, etc.) and the exposed metallic parts, one at a time. accurate and reliable high voltage meter. The calibration of
Measure the A.C. voltage across the combination of 1500 the meter should be checked periodically against a
ohm resistor and 0.15 MFD capacitor. Reverse the A.C. plug reference standard. Such as the one available at your
and repeat A.C. voltage measurements for each exposed distributor.
metallic part. Voltage measured must not exceed 0.75 volts 4. When the high voltage circuitry is operating properly there
R.M.S. This corresponds to 0.5 milliamp A.C. Any value is no possibility of an X-radiation problem. Every time a
exceeding this limit constitutes a potential shock hazard and color chassis is serviced, the brightness should be run up
must be corrected immediately. and down while monitoring the high voltage with a meter to
be certain that the high voltage does not exceed the
AC VOLT METER specified value and that it is regulating correctly. We
suggest that you and your service organization review test
procedures so that voltage regulation is always checked
as a 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 tube and the high
0.15