Daewoo SC-110 Service Manual
S/M No. : SC110N-101
Service Manual
Relese 1
DIGITAL HDTV
CHASSIS : SC-110
Model : DSC-30W60N
Specifications
General
Picture
Sound
Number of Inputs / Outputs
DSC-30W60N
Power Requirement AC 120V, 60Hz
Power Consumption 250W (1.7W in standby)
Dimensions(W/H/D) 890 x 573 x 560 mm
Weight 64kg
Antenna Two 75 ohm external input terminals for UHF/VHF/Cable
RF Band Coverage VHF 2 ~ 13
Screen Size
Display Format
Horizontal Resolution
Digital Audio
NTSC Audio
Audio Power
A/V In
S-Video In
HD Component Video In
HD Component Audio In
Digital Audio In
Digital Audio Out
External Speaker Out
One 75ohm external output terminal for Cable
UHF 14 ~ 69
CATV 1, 14 ~ 125
32 inches Pure Flat 16:9 Aspect ratio
1920 x 1080i (Digital)
Upconversion to 1080i with line doubling (NTSC)
800 Lines
Dolby Digital AC-3 / Pro logic
Multi-CH TV Stereo (MTS) / Second Audio Program (SAP)
8W / ch (Main L/R, Woofer), 5W / ch (Center, SL, SR)
4 each (Video / L / R)
2 each
2 each ( Y/ Pb / Pr, R / G / B )
1 each ( L / R / SL / SR / Center / Woofer )
2 each ( Coaxial / Optical )
2 each ( Coaxial / Optical )
1 each ( SL / SR / Woofer)
R-V3
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
Mar. 2000
TABLE OF CONTENTS
1. Product Safety................................................................................................................................2
2. Specifications.................................................................................................................................4
3. Reote Control Overview.................................................................................................................5
4. Limited Warranty............................................................................................................................7
5. Service Mode..................................................................................................................................8
6. General Adjustment.......................................................................................................................11
7. Special Adjustment (When replacing new circuit boards).........................................................17
8. Troubleshooting Charts.................................................................................................................18
9. Parts List.........................................................................................................................................45
10. Circuit Digram...............................................................................................................................59
10-1. Connection Diagram.................................................................................................................59
10-2. Signal Flow Diagram................................................................................................................60
10-3. Power Circuit............................................................................................................................61
10-4. Main Circcuit.............................................................................................................................62
10-5. Video 1 Circuit..........................................................................................................................63
10-6. Video2 Circuit...........................................................................................................................64
10-7. Audio Circuit.............................................................................................................................65
10-8. Com-Filter Circuit.....................................................................................................................66
10-9. VM Circuit.................................................................................................................................67
10-10. Blanking Circuit......................................................................................................................68
10-11. Jack A/V, Control, LED Circuit...............................................................................................68
10-12. CRT Circuit.............................................................................................................................70
11. Exploded View..............................................................................................................................71
12. PCB Layout...................................................................................................................................72
1
1.PRODUCT SAFETY SERVICING GUIDELINES FOR COLOR TELEVISION RECEIVERS
CAUTION : Do not attempt to modify this product in any way. Unauthorized modifications will not only void the warranty, but may lead to
your being liable for any resulting property damage or user injury.
Service work should be performed only after you are thoroughly
familiar with all of the following safety checks and servicing guidelines. To do otherwise, increases the risk of potential hazards and
injury to the user.
SAFETY CHECKS
After the original service problem has been corrected, a check should
be made of the following:
SUBJECT : FIRE & SHOCK HAZARD
1. Be sure that all components are positioned in such a way as to
avoid possibility of adjacent component shorts. This is especially
important on those chassis which are transported to and from the
repair shop.
2. Never release a repair unless all protective devices such as insulators, barriers, covers, shields, strain reliefs, and other hardware
have been reinstalled per original design.
3. Soldering must be inspected to discover possible cold solder joints,
frayed leads, damaged insulation (including A.C. cord), solder
splashes or sharp solder points. Be certain to remove all loose foreign particals.
4. Check for physical evidence of damage or deterioration to parts
and components, and replace if necessary follow original layout,
lead length and dress.
5. No leads or components should touch a receiving tube or a resistor
rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided.
6. All critical components such as fuses, flameproof resistors, capacitors, etc. must be replaced with exact factory types. Do not use
replacement components other than those specified or make
unrecommended circuit modifications.
7. After re-assembly of the set always perform an A.C. leakage test
on all exposed metallic parts of the cabinet, (the channel selector
knob, antenna terminals, handle and screws) to be sure the set is
safe to operate without danger of electrical shock. Do not use a
line isolation transformer during this test. Use an A.C. voltmeter,
having 5000 ohms per volt or more sensitivity, in the following
manner : connect a 1500 ohm 10 watt resistor, paralleled by a 15
mfd. 150V A.C. type capacitor between a known good earth
ground (9water pipe, conduit, etc.) and the exposed metallic parts,
one at a time. Measure the A.C. voltage across the combination of
1500 ohm resistor and 0.15 MFD capacitor. Reverse the A.C. plug
and repeat A.C. voltage measurements for each exposed metallic
part. Voltage measured must not exceed 0.75 volts R.M.S. This
corresponds to 0.5 milliamp A.C. Any value exceeding this limit
constitutes a potential shock hazard and must be corrected immediately.
A.C. VOLTMETER
GRAPHIC SYMBOLS :
The lightning flash with arrowhead symbol,
within an equilateral triangle, is intended to alert
the service personnel to the presence of uninsulated “ dangerous voltage” that may be of sufficienty magnitude to constitute a risk of electric
shock.
The exclamation point within an equilateral triangle is intended to alert the service personnel
to the presence of important safety information
in service literature.
Fuse symbol is printed on pcb adjacent to the
fuse, with “ RISK OF FIRE REPLACE FUSE AS
MARKED” . The symbol is explained in the service manual with the following wording or equivalent.
CAUTION :
FOR CONTINUED PROTECTION AGAINST FIRE
HAZARD, REPLACE ONLY WITH SAME TYPE (6.3A, 125V)” and
“
ATTENTION
: AFIN D’ ASSU UNE PROTECTION PERMANENTE
CONTRE LES RISQUES D’ INCENDIE, REMPLACER UNIQUEMENT PAR UN FUSIBLE DE MEME TYPE ET DE ” 6.3A, 125V” .
SUBJECT : X-RADIATION
1. Be sure procedures and instructions to all service personnel cover
the subject of X-rays in current T.V. receivers is the picture tube.
However, this tube does not emit X-rays when the high voltage is
at the factory specified level. The proper value is given in the applicable schematic. Operation at higher voltages may cause a failure
of the picture tube or high voltage supply and, under certain circumstances, may produce radiation in excess of desirable levels.
2. Only factory specified C.R.T. anode connectors must be used.
Degaussing shields also serve as X-ray shield in color sets.
Always re-install them.
3. It is essential that the serviceman has available an accurate and
reliable high voltage meter. The calibration of the meter should be
checked perio - dically against a reference standard. Such as the
one available at your distributor.
4. When the high voltage circuitry is operating properly there is no
possibility of an X-radiation problem. Every time a color chassis is
serviced, the brightness should be run up and down while monitoring the high voltage with a meter to be certain that the high voltage
does not exceed the 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 tub eand the high voltage compartment.
Do not 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).
Good earth ground,
such as the water
pipe, conduit, etc.
0.15 uF
1500 OHM
10WATT
Place this probe
on each exposed
metal part.
2
SUBJECT : IMPLOSION
1. All direct viewed picture tubes are equipped with an integral implosion protection system, but care should be taken to avoid damage
during installation. Avoid scratching the tube. If scratched, replace
it.
2. Use only recommended factory replacement tubes.
SUBJECT : TIPS ON PROPER INSTALLATION
1. Never install any receiver in closed-in recess, cubbyhole or closely
fitting shelf space over, or close to heat duct, or in the path of
heated air flow.
2. Avoid conditions of high humidity such as : Outdoor patio installations where dew is a factor. Near steam radiators where steam
leakage is a factor, etc.
3. Avoid placement where draperies may obstruct rear venting. The
customer should also avoid the use of decorative scarves or other
coverings which might obstruct ventilation.
4. Wall and shelf mounted installations using a commercial mounting
kit, must follow the factory approved mounting instructions. A
receiver mounted to a shelf or platform must retain its original
feet(or the equivalent thickness in spacers) to provide adequate
are flow across the bottom, bolts or screws used for fasteners
must not touch and parts or wiring. Perform leakage test on customized installations.
5. Caution customers against the mounting of a receiver on sloping
shelf or a tilted position, unless the receiver is properly secured.
6. A receiver on a roll-about cart should be stable on its mounting to
the cart. Caution the customer on the hazards of trying to roll a cart
with small casters across thresholds or deep pile carpets.
7. Caution customers against the use of a cart or stand which has not
been listed by underwriters laboratories, inc. For use with their
specific model of television receiver or generically approved for
use with T.V.’ s of the same or larger screen size.
3
2. Specification
General
Power Requirement AC 120V, 60Hz
Power Consumption 250W (1.7W in standby)
Dimensions(W/H/D) 890 x 573 x 560 mm
Weight 64kg
Antenna Two 75 ohm external input terminals for UHF/VHF/Cable
One 75ohm external output terminal for Cable
RF Band Coverage VHF 2 ~ 13
UHF 14 ~ 69
CATV 1, 14 ~ 125
Picture
Screen Size 32 inches Pure Flat 16:9 Aspect ratio
Display Format 1920 x 1080i (Digital)
Upconversion to 1080i with line doubling (NTSC)
Horizontal Resolution 800 Lines
Sound
Digital Audio Dolby Digital AC-3 / Pro logic
NTSC Audio Multi-CH TV Stereo (MTS) / Second Audio Program (SAP)
Audio Power 8W / ch (Main L/R, Woofer), 5W / ch (Center, SL, SR)
Number of Inputs / Outputs
A/V In 4 each (Video / L / R)
S-Video In 2 each
HD Component Video In 2 each ( Y/ Pb / Pr, R / G / B )
HD Component Audio In 1 each ( L / R / SL / SR / Center / Woofer )
Digital Audio In 2 each ( Coaxial / Optical )
Digital Audio Out 2 each ( Coaxial / Optical )
External Speaker Out 1 each ( SL / SR / Woofer)
4
33. Remote control overview
The remote control has the following functions:
1. Power button
Press to turn the HDTV(and other equipment) on
and off.
2. MODE buttons
Press to select which equipment you wish your remote
control to operate:
* SAT(satelite)
* CATV (cable box)
* VCR
* TV
The Mode button you press will light up in red.
3. MENU button
Press once to display the HDTV menus. Press again to
make the menus disappear.
4. SEL ( Select) button
Press to select items on the HDTV menus.
5. Arrow buttons
Press to navigate through the HDTV menus.
6. STAT (Channel Station) button
Press to quickly select chammels to watch on your
HDTV.
7. VOL (Volume) buttons
press to raise and lower the volume on your HDTV.
8. Number buttons
Press to directly select channels or to enter the numbers
in the menus.
9. INFO (Information) button
Press to see the channel banner that provides information
while viewing your HDTV.
10. V MODE (Video Mode) button
Press to select a video mode : Normal, Dynamic,
Cinema or Customer.
5
Remote control overview
11. SOUND button
Press to select a sound option : Mono, Stereo, or Secondary
Audio Programming (SAP). When you tune to a digital
channel, press to select various languages.
12. SLEEP TIMER button
Press to select the time before the HDRV turns off: 30
minutes, 60 minutes, 90 minutes, or 120 minutes.
13. CLOSED CAPTION button
Press to turn closed captions on and off.
14. FF (Fast Forward) button.
Press to fast forward a videocassette.
15. PLAY button
Press to play a videocassette.
16. PAUSE button
Press to pause a VCR.
24. PREV (Previous) button
Press to back up one menu at a time in the HDRV menus or to
return to the previous channel.
25. GUIDE button
Press this button to see the HDTV Program Guide.
26. MUTE button
Press to mute the HDTV sound.
27. TV / VIDEO button
Press to view components you have connected to the HDTV.
Press this button repeatedly to display:
* TV mode
* HD comp (HD Component Video)
* Video 1
* Video 2
* Video 3
* Video 4
17. REC(Record) button
Press to record a videotape.
18. STOP button
Press to stop a VCR.
19. REW (Rewind) button
Press to rewind a videocassette.
20. SCREEN MODE button
Press to select how to view your HDTV:
Normal or Full.
21. ADD / ERASE button
Press to add and erase channels on your HDTV.
22. 100 button
Press to select cable channels over 100 on TV or DSS
broadcasts.
23. CH (Chnnel) buttons
Press to select channels.
6
4. Limited Warranty
Daewoo Electronics Corporation of America Inc. (also known as DECA) warrants this product to be free from defects in material
and workmanship and agrees to remedy any such defect.
This warranty covers 3 years labor and 3 years parts from the date of original purchase.
This warranty applies only to product purchased from authorized DECA dealer and used within the boundaries of U.S.A.
This warranty does not apply to product that has been improperly installed, subjected to usage for which the product was not
designed, misused or abused, damaged during transportation, or which has been altered in any way that affects the reliability or
detracts from its performance.
How you get warranty service
Warrany service can only be provided by an authorized DECA service center. For the closest authorized service center to you,
please contact your Dealer. In order to receive warranty service you must provide the authorized service center with a copy of proof
of purchase, signifying the date of purchase and the name of the Dealer from whom you purchased the product.
Statutory warranities
The purchase may have rights under existing provincial or federal laws, and where any terms of this warranty are prohibited by
such laws, they ard deemed null and void, but the remainder of the warranty shall remain in effect.
If you require further assistance, please call:
1-800-DAEWOO-8
7
5. Service Modes
1. Entering to Service Mode
1) With the user remote control
Press the button in the following order.
1 MUTE SELECT POWER 1,2,3, …., 9MUTE
2) With the service remote control
S1 : Heat Run S2 : Screen Voltage S3 : Sound Controls
S4 : Video Controls S5 : Geometry S7 : White Balance
S8 : Sub Brightness S9 : Software Version S10: Factory Setting
2. Function of each service mode
1) S1 : Heat Run mode.
White Pattern
2) S2 : Screen Voltage Control mode
The vertical deflection is down, and a horizontal line appears on the screen.
3) S3 : Sound Controls mode
Equalizer : 60Hz, 250Hz, 1KHz, 3.5KHz, 10KHz
Ø
Main Volume : 0 → 63 → 31
Ø
Balance control : -31 → 31 → 0
Ø
Center Volume : 0 → 63 → 31
Ø
4) S4 : Video Controls mode
Ø Tint :0 → 63 → 31
Ø Brightness : 0 → 48 → 24
Ø Contrast : 0 → 48 → 24
Ø Color : 0 → 63 → 31
Ø Sharpness : 0 → 63 → 31
8
5) S5 : Geometry Adjustment mode
Service Modes
V Size Max
V Size
V Position
V C Linearity
Initial value
V S Linearity
H Size
H Position
Pincusion
31
0
26
23
31
53
70
32
Side Pin W
Side Pin S
Trapezoid
Side Pin Balance
H Duty
Parallelogram
H Focus Phase
H Focus Amplitude
22
34
33
31
31
28
31
60
6) S6 : No Use
7) S7 : White Balance Adjustment mode
White Balance Control
Drive R 128
Initial value
G 32
B 128
Bias R 64
G 224
B 64
8) S8 : Sub Brightness Adjustment mode.
Brightness 24
Contrast 22
Initial value
Color 32
Tint 37
Coring 63
VM Gain 27
VM Limit 40
9) S9 : Software Version
2000/04/06 08:30 AM
10) S12 : Factory Setting
9
Service Modes
3. Selecting the adjusting items
1) With the user remote control
Pressing of ARROW s button changes the adjustment items. (t button for reverse order)
2) With the service remote control
Pressing of CHANNEL s button changes the adjustment items. (t button for reverse order)
4. Adjusting the data
1) With the user remote control
Pressing of ARROW button changes the value of data. ( button for reverse order)
2) With the service remote control
Pressing of VOLUME button changes the value of data. ( button for reverse order)
3
3
4
4
5. Exit from Service Mode
Press again to make service mode exit.
10
6. General Adjustment
In the majority of cases, a high definition digital television will need basic adjustments such as high voltage, screen voltage, focus,
white balance, sub brightness, geometry, and blanking width. All adjustments should be performed after heat-running the set for at
least 20 minutes.
1. Press the S1 button on the service remote control, and then full white pattern will appear on the screen.
2. Press again the S1 button, and then the pattern will disappear.
High Voltage Adjustment
1. Operate the set for at least 20 minutes.
2. Connect the probe of high voltage meter to CRT ANODE.
3. Adjust the variable register RV801 on the power assembly so that high voltage may be to be between 29.5KV ~ 30.5KV.
Screen Voltage Adjustment
1. Press the S2 button on the service remote control.
1) Video Input mode will be VIDEO 1.
2) Vertical deflection will be down, and a horizontal line will appear on the screen.
2. Turn the variable screen volume of FBT to adjust screen voltage, at the point that a horizontal line only just appears.
Focus Adjustment
1. Tune on Retma pattern.
2. Turn the variable focus volume of FBT so that the center area of screen is sharp scanning line.
3. Turn the variable volume R522 on the CRT assembly so that the edge of screen may be sharp scanning line.
White Balance Adjustment
1. Input the Black & white signal to the HD Component jack on the rear panel.
<Black & White Pattern>
Light Area Check
Dark Area Check
2. The color temperature is the following.
3 x=0.270 6 0.005 y=0.270 6 0.005
3 Color temperature : 10500 8K
3. Light Area Adjustment
1) Press S7 button.
2) On the center of light area, attach the sensor of a white balance meter.
3) To be Y=125, turn the Light Beam control volume on the White & Black pattern generator.
4) To adjust the white balance of light area, select Drive R, G, B with CHANNEL Up or Down buttons, and adjust individual
vales with VOLUME Up or Down buttons.
11
General Adjustment
4. Dark Area Adjustment
1) On the center of dark area, attach the sensor of a white balance meter.
2) To be Y=12, turn the Dark Beam control volume on the White & Black pattern generator.
3) To adjust the white balance of dark area, select Bias R, G, B with CHANNEL Up or Down buttons, and adjust individual
values with VOLUME Up or Down buttons.
4) Repeat two processes above until the white balance is completed.
Sub Brightness Adjustment
1. Tune on Retma Pattern.
2. Press S8 button.
3. The following OSD menu will appear on the screen, and the data are initial balues before adjusting.
Brightness 24
Contrast
Color
Tint
Coring
VM Gain
VM Limit
22
32
37
63
27
40
No need to adjust.
4. To be between Step 40% and 50% on the Contrast Chart, perform fine adjustment of sub brightness.
40% 30% 20% 10%
50% 0% 0% 5%
60% 70% 80% 100%
12
Geometry
1. To adjust V-Position, H-Size, H-Position and so forth, tune on Retma Pattern.
2. To adjust Pincushion, Parallelogram and so forth, tune on Cross Hatch signal.
3. Screen Mode should be on Full mode, and the Video Mode should be on Normal mode.
4. Press S5 button to adjust Geometry.
5. With Up/Down buttons, perform the adjustment items in the following order.
Item Screen Image Adjustment Procedure
General Adjustment
V Size Max.
1) Receive NTSC Retma signal.
2) The Screen mode should be selected on Full mode
3) Adjust Vertical Size so that over scanning rate may be 105%.
4) Check if the center circle is not only circular on Full mode
but also on Normal mode.
Over Scanning Rate: 105%
Vertical Size 1) There is no need to adjust.
2) Check if the value of data is "0".
Vertical
Position
1) Receive NTSC Retma signal.
2) The Screen mode should be selected on Full mode.
3) Adjost Vertical Position so that the circle of Retma signal
may be centered in the verical direction.
VC
Linearity
1) Receive NTSC Retma signal.
2) The Screen mode should be selected on Full mode.
3) When the center area of Retma signal's circle is S type in the
vertical direction, adjust VC Linearity so that vertical interval
may be the same.
13
General Adjustment
Item Screen Image Adjustment Procedure
1) Receive NTSC Retma signal.
2) The Screen mode should be selected on Full mode
3) When the center area of Retma signal’s circle is S type
V S
Linearity
Horizontal
Size
in the vertical direction, adjust VS Linearity so that
vertical interval may be the same.
1) Receive NTSC Retma signal.
2) The Screen mode should be selected on Full mode
3) Adjust Horizontal Size for over scanning rate 106%
4) Check if the center circle of Retma signal is circle on
Normal mode.
Horizontal
Position
Pincushion
Side Pin W
1) Receive NTSC Retma signal.
2) The Screen mode should be selected on Full mode.
3) Adjust Vertical Position so that the circle of Retma
signal may be centered in the vertical direction.
1) Receive NTSC Cross Hatch signal.
2) The Screen mode should be selected on Full mode.
3) When the vertical lines of the left and right side are
distorted such as the left figure, adjust Pincushion so
that the vertical lines may be straight.
1) Receive NTSC Cross Hatch signal.
2) The Screen mode should be selected on Full mode.
3) When the vertical lines of the left and right side are
not straight but distorted in the W type, adjust Side
Pin W to correct the unbalanced vertical lines.
14
Item Screen Image Adjustment Procedure
1) Receive NTSC Cross Hatch signal.
2) The Screen mode should be selected on Full mode.
3) When the vertical lines of the left and right side is not
Side Pin S
straight but distorted in the S type, adjust Side Pin S
to correct the unbalanced vertical lines.
1) Receive NTSC Cross Hatch signal.
2) The Screen mode should be selected on Full mode.
3) When the screen shape is not rectangular but
Trapezoid
trapezoid, adjust Trapezoid to correct the unbalanced
shape.
1) Receive NTSC Cross signal.
2) The Screen mode should be selected on Full mode.
Side Pin
Balance
3) When both the left and right screen shape is not
symmetrical but on one side, adjust Side Pin Balance
to correct the unbalanced shape.
General Adjustment
H Duty
Paralle-
logram
H Focus
Phase
400Vp-p
900Vp-p
60HZ
1) There is no need to adjust.
2) Check if the value of data is "31".
1) Receive NTSC Cross Hatch signal.
2) The Screen mode should be selected on Full mode.
3) When both the left and right screen shape is on one
side, adjust Parallelogram to correct the unbalanced
shape.
1) There is no need to adjust, and check if the value of
data is "32".
2) Check that the focus on the right and left side is clear.
15
General Adjustment
Item Screen Image Adjustment Procedure
H Focus
Amplitude
400Vp-p
900Vp-p
60Hz
1) There is no need to adjust, and check if the value of
data is "32".
2) Check if the focus on the right and left side is clear.
Blanking Width
1. Tune on NTS Retma pattern.
2. Press Screen mode on the remote control, and then slelct Normal. mode.
3. To be symmetrical the screen, adjust Blanking Width with rotating the variable volume RU19 on the Blanking Board.
Y Level Adjustment (to DTV Decoder module)
1. Tune on SMPTE Color Bar signal.
2. Connect a scope probe to pin 9 of PW06V.
3. Adjust RV900 such as the following figure so that the amplitude of Y level may be 0.7Vp-p.
16
7. Special Adjustment (When replacing new circuit boards)
1. DTV Decoder module
1) Before replacing a new module, if seeing OSD menu is possible, record the adjusted data value of White Balance and
Geometry.
2) After replacing the defective module with a new one, memorize the value of data value to the new DTV decoder module
with the service remote control.
3) Perform the Y Level Adjustment.
2. Power assembly
1) After replacing a new assembly, perform High Voltage Adjustment.
2) The rest are no need to adjust.
3. Main assembly
1) After replacing a new assembly, perform Blanking Width Adjustment.
2) X-Rediation Protection Circuit Test
When service has been performed on the horizontal deflection system, high voltage system or B+ system, the X-Radiation
Protection Circuit Test must be tested for proper operation as follows:
2-1) Operate the HDTV set for at least 15 minutes.
2-2) Perform this test at the normal video and sound.
2-3) Check the cathode voltage of D837. Its voltage should be about 26VDC.
2-4) Connect a resister 24K(1/4W) with parallel to R925.
2-5) Then the set will be shut down, lighting up red to the power indicator.
2-6) If it is not, the circuit of X-Radiation Protection must be repaired before the set is returned to the customer.
3) The rest adjustment idems are no need to adjust.
4. Video assembly
1) No need to adjust.
17
Special Adjustment
No Picture
(NTSC Signal)
OSD is on the screen.
AV Signal RF Signal
Check video signal of IC210.
Video 1 : CVBS to pins 43 ,Y to pin 45,
and C to pin 47
Video 2 : CVBS to pin 7
Video 3 : CVBS to pin 27
Video 4 : CVBS to pin 1 ,Y to pin 3, and
C to pin 5
NO
Check each
YES
CVBS is to pin 34 of IC210. Check IC210.
input signal.
Check if CVBS is 1Vp-p to pin 88 of ICA1. Check QCA9 , FA3, andQCA11
NO
To DTV Decoder Module
CVBS is to pin 13 of PW01M
NO
Check Tuner (U101).
YES
NO
YES
NO
YES
Check if Y output is 0.9Vp-p to Yout of PV1.
YES
Check if the color burst of C signal is 170~180mV to Cout of PV1.
V1
18
NO
Check QCA4, FA1, and QCA1
NO
Check QCA8, FA2, and QCA5
8. Troubleshooting charts.
V1
When input signal is color bar, check the following output level
to PA06D.
Y=0.7Vp-p ± 0.1Vp-p
Pb=0.6Vp-p ±0.1Vp-p
Pr=0.6Vp-p±0.1Vp-p
YES
NO
To DTV Decoder Module
Check the input and output signal of IC208.
Pins 9, 10, and 11 : Low (Base of QC215 : High)
Pin 14 : Y signal Pin 15 : Pb signal
Pin 4 : Pr signal
YES
Check if Y, Pb, and Pr are input
VIDEO
Check if Y, Pb, and Pr are input to pins 58, 59, and
57 of IC200.
to pins 45, 47, and 1 of IC200.
YES
V2
NO
NO
Check IC208
Check logical state to pin 52 of 212 IC.
NTSC, DTV signal : High
External HD Component : Low
Check the following parts.
NO
Y : Q204, Q205 Pb : Q202, Q203
Pr : Q200, Q201
Check the following parts.
Y : pin 27 of IC200, Q208, Q209, and Q210
Pb : pin 15 of IC200 Pr : pin 13 of IC200
19
Troubleshooting charts
V2
Signals R, G, and B are to pins 2, 4, and 6 of PW07K.
YES
There are R signal to R504, G signal to R513, and
B signal.
<The signal amplitude of cathode G >
130Vp-p ±10Vp-p
Input signal : 10 steps pattern
Video mode : Normal mode
END
NO
Check the following parts.
R : pin 25 of IC201, Q218
G : pin31 of IC201, Q216
B : pin 28 of IC201, Q217
NO
Check the following parts.
R: pin8 of IC501, G: pin8 of IC502, B: pin 8 of IC503
Check 200V and 12V of PA17M.
No picture
(DTV Signal)
NO
OSD is on the screen. To DTV Decoder module
V1
V2
END
20
Y, Pb, Pr Input
Pb/Pr.
Troubleshooting charts
OSD is on the screen. To DTV Decoder module
NO
YES
Check the SELECT SGINAL switch on the rear panel is to Y/
Select the switch to Y/Pb/Pr.
NO
If the switch is selected to R/G/B, the color of screen is pale green.
Check if Y/Pb/Pr signals are well
connected to input terminals.
YES
Check if pin 18 of IC212 is Low.
Check the input/output signal of IC207.
Pins 9, 10, and 11 : Low Pin 14 : Y signal
NO
Pin 15 : Pb signal Pin 4 : Pr signal Check IC207.
YES
Check the input/output signal of IC208.
NO
Pins 9, 10, and 11 : High (Base of QC215 : Low)
Check IC208
Pin 14 : Y signal Pin 15 : Pb signal Pin 4 : Pr signal
VIDEO
V2
END
21
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