Samsung 794MBplus, 796MBplus, 798MB Alignment and Adjustment

3 Alignments and Adjustments

3-1

3 Alignments and Adjustments

This section of the service manual explains how to make permanent adjustments to the monitor. Directions are given
for adjustments using the monitor Interface Board Ver. 2.0 and software (Softjig).

3-1 Adjustment Conditions

3-1-1 Before Making Adjustments

3-1-1 (a) ORIENTATION

When servicing, always face the monitor to the east.

3-1-1 (b) WARM-UP TIME

The monitor must be on for 30 minutes before starting
alignment. Warm-up time is especially critical in color
temperature and white balance adjustments.

3-1-1 (c) SIGNAL

Analog, 0.7 Vp-p positive at 75 ohm, internal
termination
Sync: Separate
(TTL level negative/positive)

3-1-1 (d) SCANNING FREQUENCY

Horizontal :

30 kHz to 85 kHz (KS17CNJ)

Horizontal :

30 kHz to 70 kHz (KS17CNK)

Vertical : 50 Hz to 160 Hz (Automatic)
Unless otherwise specified, adjust at the

1024 x 768 mode (68 kHz/85 Hz),
Refer to Table 2-1 on page 2-3.

3-1-2 Required Equipment

The following equipment may be necessary for
adjustment procedures:

3-1-2 (a) DISPLAY CONTROL ADJUSTMENT

1. Non-metallic (

) screwdriver:

1.5, 2.5, 3 mm

2. Non-metallic (

) screwdriver:

1.5, 2.5, 3 mm

3. Digital Multimeter (DMM), or
Digital Voltmeter

4. Signal generator, or
DM200 software

5. Personal computer

3-1-2 (b) COLOR ADJUSTMENTS

1. All equipment listed in 4-1-2 (a), above

2. Color analyzer, or any luminance measurement
equipment.

3-1-3 After Making Adjustments

After finishing all adjustments, test the monitor in all
directions. If, for example, the monitor does not meet
adjustment specifications when facing north, reposition
the monitor to face east and readjust. This time, try for
an adjustment closer to the ideal setting within the
tolerance range. Test the unit again in all directions. If
the monitor again fails to meet specifications in every
direction, contact your Regional After Service Center
for possible CDT replacement.

Caution: Changes made without the Softjig are saved only to the user mode settings. As such, the

settings are not permanently stored and may be inadvertently deleted by the user.

3 Alignments and Adjustments

3-2

Signal: 1024 x 768 (68 kHz/85 Hz)
Display image: Don’t care
Contrast: Minimum
Brightness: Minimum

Limit: 26.0 kV

0.3 kV

Measure the high voltage level at the anode cap. High
voltage should be within the limit as above.

3-2-2 Centering

Centering means to position the center point of the
display in the middle of the display area. Horizontal
size and position and vertical size and position control
the centering of the display.

Adjust the horizontal size and vertical size to their
optimal settings: 312 mm (H) x 234 mm (V) :

Adjust the horizontal position and vertical position to

5.0 mm of the center point of the screen.

|A-B|

5.0 mm. |C-D| 5.0 mm.

Figure 4-1. Centering

* In Softjig window, "Geometry" has to be

selected for GD adjustment.

3-2-2 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS

Scanning frequency: 68 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

Click Standard Dump on the right Menu in the general
field.

Use control bar after selecting size B+ in the left Menu
to adjust the horizontal size of the display, Pattern to

Pattern to 312mm(Tolerance :

4mm.)
Run the All Mode save in the Right Menu.
Caution :

Do not Run the All mode Save at the other

scannig times except for 1024x768 (68kHz/85Hz)

3-2-2 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS

Scanning frequency: 68 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

Use control bar after selecting "V-SIZE" in left menu
to adjust the vertical size of the display pattern to 234
mm.(Tolerance:

4 mm.)

3-2-2 (c) HORIZONTAL POSITION
ADJUSTMENT

CONDITIONS

Scanning frequency: 68 kHz/85 Hz :
Display image: Crosshatch pattern

Use control bar after selecting "H-POSITION" in left
menu to center the horizontal image on the raster.

3-2-2 (d) VERTICAL POSITION ADJUSTMENT
CONDITIONS

Scanning frequency: 68 kHz/85 Hz :
Display image: Crosshatch pattern

Use control bar after selecting "V-POSITION" in left
menu to center the vertical image on the raster.

3-2 Display Control Adjustments

3-2-1 HIGH VOLTAGE

C

A

DISPLAY AREA

EDGE OF BEZEL

B

D

3 Alignments and Adjustments

3-3

3-2-3 Linearity

Linearity affects the symmetry of images as they
appear on the screen. Unless each row or column of
blocks in a crosshatch pattern is of equal size, or within
the tolerances shown in Tables 4-2 and 4-3, an image
appears distorted, elongated or squashed.

Table 3-2. Standard Modes Linearity:

1024 x 768 / 85Hz

Table 3-3. Other Modes Linearity:

above 40 KHz(Hf)

Off Spec : Under 40 KHz (Hf)

3-2-3 (a) VERTICAL LINEARITY ADJUSTMENT
CONDITIONS

Scanning frequency: 68 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

To adjust the Vertical Linearity, refer to Tables 3-2 and
3-3 for the tolerance range.

Use control bar after selecting

"V-LINEARITY BAL"

in left menu to optimize the image.

3-2-4 Trapezoid Adjustment

CONDITIONS

Scanning frequency: 68 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

Use control bar after selecting "TRAPEZOID" in left
menu to make the image area rectangular.

Figure 3-2. Trapezoid

3-2-5 Pinbalance Adjustment

CONDITIONS

Scanning frequency: 68 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

Figure 3-3. Pinbalance

Use control bar after selecting "PINBALANCE" in
left menu to optimize the image.

3-2-6 Parallelogram Adjustment

CONDITIONS

Scanning Frequency: 68 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

Use control bar after selecting "PARALLEL" in left
menu to make the image area rectangular.

Figure 3-4. Parallelogram

| A - B | < 4 mm

A

B

B

A

4 : 3

Horizontal: 20.5~23.5
Vertical

: 20.5~23.5

Supported Timing Mode

Each block (14%)

Difference between

adjacent blocks (5%)

Horizontal: Less than 1.10 mm
Vertical

: Less than 1.10 mm

4 : 3

Horizontal: 20.9~23.1
Vertical

: 20.9~23.1

Standard Modes Linearity

Each block (10%)

Difference between

adjacent blocks (4%)

Horizontal: Less than 0.88 mm
Vertical

: Less than 0.88 mm

D1 D2 D1

4 mm