Samsung AV17 Alignment and Adjustments

4 Alignment 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).

4-1 Adjustment Conditions

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.

4-1-1 Before Making Adjustments

4-1-1 (a) ORIENTATION

When servicing, always face the monitor to the east.

4-1-1 (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.

4-1-1 (c) SIGNAL

Analog, 0.7 Vp-p positive at 75 ohm, internal termination

Sync: Separate

(TTL level negative/positive)

4-1-1 (d) SCANNING FREQUENCY

Horizontal	: 30 kHz to 70 kHz (Automatic)
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.

4-1-2 Required Equipment

The following equipment may be necessary for adjustment procedures:

4-1-2 (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

4-1-2 (b) COLOR ADJUSTMENTS

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

2.Color analyzer, or any luminance measurement equipment.

4-1-3 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 CRT replacement.

AV17**

4-1

4 Alignment and Adjustments

4-2 Display Control Adjustments

4-2-1 HIGH VOLTAGE

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.

4-2-2 CENTER RASTER

Adjust SW401 so that the back raster comes to the center when you apply basic mode for 17”.

4-2-3 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.

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).

4-2-3 (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.)

4-2-3 (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.

|A-B| ≤ 5.0 mm. C	|C-D| ≤ 5.0 mm.
	DISPLAY AREA
A	B
	EDGE OF BEZEL
D
Figure 4-1. Centering

*In Softjig window, “Geometry” has to be selected for GD adjustment.

4-2-3 (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 312mm(Tolerance : ±4mm.)

4-2-3 (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.

4-2-4 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 4-1. Standard Modes Linearity:

1024x768/85Hz

Standard Modes Linearity

		Each block (10 %)	Difference between
			adjacent blocks (4 %)
	4 : 3	Horizontal: 20.9~23.1	Horizontal: Less than 0.88 mm
		Vertical : 20.9~23.1	Vertical : Less than 0.88 mm

4-2

AV17**