Samsung CW25D83NS8XXEC User manual

COLOR TELEVISION RECEIVER
Chassis : KS3A(P)_50Hz_REV. 4
Model : CW21M63NS8XXEC
CW25D83NS8XXEC
CW28D83NS8XXEC
CW29M64NS8XXEC
CW29M66VS8XXEC
COLOR TELEVISION RECEIVER CONTENTS
Precautions
Reference Information
Specifications
Alignment and Adjustments
Troubleshooting
Exploded Views and Parts List
Electrical Parts List
Block Diagrams
Wiring Diagram
Schematic Diagrams
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

ELECTRONICS
©Samsung Electronics Co., Ltd. May. 2002
Printed in Korea
3KS3A_50-SEH-0508

Specifications
Samsung Electronics 3-1
3. Specifications
Specifications are subject to change.
Television
System
Antena Input
CS
Power
Consumption
Requirements
Frequency
Sound
Output
Effect
Jacks
Front
(AV2)
Back
PAL/SECAM-B/G,D/K,L,I, NTSC-M
130W (Applied When 29” Flat)
220V Only
Free Voltage
50/60Hz
15W x 2CH
10W x 2CH
5W x 2CH
Virtual Dolby
Turbo Sound
Pseudo Stereo
RCA Input
S-VHS
Head-Phone
RCA99(AV2 Input/Out)
2Scart Input/Output
DVD Input(YPbPr)
AV2 Monitor Audio Output
S-VHS
75ohms, Coaxial Cable
Not Present R815
Option
Option
AV1 : Scart I/O, RGB Input,
RF Out
AV2 : Scart I/O, Monitor Out
Option
Option
Option
N
P
PF
PT
PW
MT
NT
WT
GW
Function
NICAM
2 TUNER PIP
2 TUNER PIP, NICAM, TTX
2 TUNER PIP, A2 STEREO, TTX
2 TUNER PIP, A2 STEREO
2 TUNER MULTI PIP, A2 STEREO,
NICAM, TTX
A2 STEREO, TTX
1 TUNER PIP, A2 STEREO, TTX
NOTE
“NICAM” means that
A2 STEREO + NICAM
Specifications for Model Name (Ex. CS29A6??8X/HAC)
29 Inch
21 Inch

3-2 Samsung Electronics
MEMO

Alignment and Adjustments
Samsung Electronics 4-1
4. Alignment and Adjustments
4-1 General Alignment Instructions
1. Usually, a color TV-VCR needs only slight
touch-up adjustment upon installation. Check
the basic characteristics such as height,
horizontal and vertical sync and focus.
2. Observe the picture for good black and white
details. There should be objectionable color
shading; if color shading is present,
demagnetize, perform purity and convergence
adjustments described below.
3. Use the specified test equipment or its
equivalent.
4. Correct impedance matching is essential.
5. Avoid overload. Excessive signal from a
sweep generator might overload the front-end
of the TV. When inserting signal markers, do
not allow the marker generator to distort test
results.
6. Connect the TV only to an AC power source
with voltage and frequency as specified on the
backcover nameplate.
7. Do not attempt to connect or disconnect any
wires while the TV is turned on. Make sure
that the power cord is disconnected before
replacing any parts.
8. To protect against shock hazard, use an
isolation transformer.
4-2 Automatic Degaussing
A degaussing coil is mounted around the
picture tube, so that external degaussing after
moving the TV should be unnecessary. But
the receiver must be properly degaussed upon
installation.
The degaussing coil operates for about 1
second after the power is switched ON. If the
set is moved or turned in a different direction,
the power should be OFF for at least 10
minutes.
If the chassis or parts of the cabinet become
magnetized, poor color purity will result. If
this happens, use an external degaussing coil.
Slowly move the degaussing coil around the
faceplate of the picture tube and the sides and
front of the receiver. Slowly withdraw the coil
to a distance of about 6 feet before turning
power OFF.
If color shading persists, perform the
following Color purity and Convergence
adjustments.
4-3 High voltage Check
CAUTION : There is no high voltage adjustment
on this chassis. The B+ power supply should be
+135 volts (with full color- bar input and normal
picture level).
1. Connect a digital voltmeter to the second
anode of the picture tube.
2. Turn on the TV. Set the Brightness and
Contrast controls to minimum (zero beam
current).
3. Adjust the Brightness and contrast controls to
both extremes. Ensure that the high voltage
does not exceed 32 KV under any conditions.

Alignment and Adjustments
4-2 Samsung Electronics
4-5 SCREEN Adjustment
1. Input Toshiba Pattern
2. Enter “Service Mode”.(Refer to “Service Mode”)
3. Select “G2-Adjust”.
4. Set the values as example(Refer to page4-24).
4-4 Dynamic Focus Adjustment
1. A dynamic focus adjustment should be done
after replacing the CRT PCB, FBT or CRT.
2. Input a crosshatch pattern.
3. Enter “ STANDARD “ in video mode.
4. Turn the Dynamic focus VR fully clockwise
(maximum).( )
5. Turn the Static focus VR fully
counterclockwise (maximum).( )
6. Slowly turn the static focus VR
counterclockwise. Adjust until the
vertical line in the middle of the screen
has maximum clarity.( )
7. Slowly turn the dynamic focus VR (clockwise)
and adjust the 3rd horizontal line for
maximum clarity.( )
8. Repeat 4-7, if necessary.
STATIC FOCUS VR
DYNAMIC FOCUS VR
H
V
SCREEN
<FBT FOCUS PACK>
❷
❶
❷
❶
❷
❶
❷
❶
ex) IBRM = 220
WDRV = 35
CDL = 220
COLR G B = 150 150 150

Alignment and Adjustments
Samsung Electronics 4-3
When you do not have Toshiba Pattern, follow this method.
1. Set the TV on the condition that AV mode no signal(black)
2. Enter the “Menu” and set the mode to blue screen off.
3. Enter the “Service Mode”.
4. Select “ G2-Adjust”.
5. Set the values as example(Refer to page4-24).
ex) IBRM = 220
WDRV = 35
CDL = 220
COLR G B = 150 150 150
6. Turn the SCREEN VR until the value of “ MRCR G B” is about 120. Do not mind that
the “OSD” Color is red.
■ After completing G2-Adjust, follow this procedure.
① Enter the “Video Adjust 1”.
➁ Choose any item in menu. (ex. Select “Red Cutoff”)
➂ Change the value of item you select, and recover the value.
For example, when the value of “Red Cutoff” is 127, change the value to 128 and restore
the value to 127.
If you do not follow this procedure, the picture may be abnormal.
For example, when the TV set is on, the picture becames brighter gradually.
Note 1.
5. Turn the SCREEN VR until “MRCR G B” and “MRWDG” are green and those value are about 100.
(The incorrect SCREEN Voltage may result that “MRCR G B” and “MRWDG” should be red)

Alignment and Adjustments
4-4 Samsung Electronics
4-6 E2PROM (IC902) Replacement
1. When IC902 is replaced, all adjustment data revert to the initial values.
So, all adjustment values when servicing should be readjusted.
2. After IC902 is replaced, connect the AC power supply cord.
3. Turn the power switch ON.
4. In stand-by, warm up the TV for at least 10 seconds.
5. Power on the TV.
4-7 White Balance Adjustment
■ Equipment : Color-Analyzer (CA-100)
■ Input Signal : Pattern signal (Toshiba pattern)
1. Select STANDARD from the menu.
2. Input an 100% White pattern.
3. Enter the “Service Mode”. (Refer to “4-8 Service Mode”)
4. Warm up the TV set at least for 30 minutes.
5. Input a Toshiba pattern signal.
6. Enter the “Video Adjust1”.
- Adjust “Sub Contrast” so that Y (luminance) becomes 40 ft ± 3.
- Use “Red Drive” and “ Blue Drive” to adjust High-Light (x : 290, y : 300)
- Adjust “Sub Bright” so that Y (luminance) becomes 1.3ft ± 0.3.
- Use “Red Cutoff” and “Blue Cutoff” to adjust Low-Light (x : 290, y : 300).
7. Adjust CA-100 so that the final adjustment value can be fixed.
8. Use the Channel Up/Down (▲/▼) buttons to move the cursor on the adjustment modes.
9. Use the Volume +/- buttons to change the adjustment value.
■SMPS Controller differentiol List
LOC.
DZ808
C811
C828
1265RD
1265RB
SPEC
MTZ8.28
47NF
221.50V
SPEC
MTZ8.28
47NF
221.50V
LOC.
DZ808
C811
C828

■ Background : It is occurred to service confusion
■ Cause : CRT Socket PCB change as CRT changing from Double Focus to Single Focus
■ How to service
Code : It is different to CRT Socket Code per focus type
Case :
1. Using CRT Socket PCB for Single Focus at CRT for Double Focus
(1) Change the CRT Socket in PCB(Single →Double).
(2) Cut the red-colored focus wire of FBT in set.
(3) Connect the wires at Focus terminal like picture #1 for short circuit using red-colored focos
wire of FTB.
2. Using CRT Socket PCB for Double Focus at CRT for Single Focus
(1) Change the CRT Socket in PCB(Double →Single).
(2) Cut the red-colored focus wire of FBT in set like picture #2.
❈ You mus tape the isolation parts for safety.
Alignment and Adjustments
Samsung Electronics 4-5
KS3A 29” Flat 50Hz, CRT Change(Double Focus →→Single Focu)
Note 2.
CRT Socket
For Double Focus
For Single Focus
Code No
3704-001032
3704-000114

Alignment and Adjustments
4-6 Samsung Electronics
4-8 Factory Adjustment
1. To enter the “Service Mode”, Press the remote-control keys in this sequence :
- If you do not have Factory remote-control
- If you have Factory remote-control
2. After the Service Mode is entered, the initial screen is as shown in the figure below.
*
Service
Deflection
Video Adjust 1
Video Adjust 2
Video Adjust 3
Option(81h 0Ch)
Reset
G2-Adjust
Others
3. Use the Channel Up/Down buttons to move the cursor in the adjustment parameters.
- When CRT, CRT PCB, FBT, E2PROM (sometimes MICOM) is replaced, the adjustment values
should be controlled.
- After the Service adjustment is completed, Do not select “Reset” in the service mode menu.
(After above procedure is done, power is on initially and the “Plug and Play” will be operated.)
PICTURE OFF PICTURE ON
DISPLAY() MENU MUTE
PICTURE ON DISPLAY() FACTORY
4-8-1 Service Mode
*These hexa digits are check sum value which
depends on the MICOM.
If check sum value is changed, the value of
E2PROM Data newly initialed.
Note 3.