SAMSUNG 797DF Service Manual Alignment & Adjustment

4 Alignment and Adjustments

This section of the service manual explains how to make permanet adjustments to the monitor. Use the MTI-2031 jig and soft jig when adjust this part.

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.

Figure 4-1. When using signal generator

Figure 4-2. When using only PC

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/Composite

(TTL level negative/positive)

Table 4-1. MDL File and DDC File on each model

Model MDL File DDC File Remarks

LE19IS LE19I_SDI_BNC_v00 SM997DF.ddc Syncmaster LE19IS LE19IS_SDI_v00 CD197G.ddc Syncmaster LE19IT LE19IT_SDI_v00 S990DF.ddc Syncmaster

ST98PDF.ddc Syncmaster

LE17IS LE17IT_SDI_v00 SM797DF.ddc Syncmaster

SM737DF.ddc Syncmaster

4-1-1 (d) SCANNING FREQUENCY

Horizontal: 30 kHz ~ 96 kHz (Automatic) Vertical: 50 Hz ~ 160 Hz (Automatic)

4-1-1 (e) HIGH VOLTAGE ADJUSTMENT

Signal: 1024 x 768 mode (68 kHz / 85 Hz) Display image: Full white Contrast: Maximum Brightness: Maximum Limit: LE17 inch

Direct POINT : 26.0KV ± 0.5KV

Indirect POINT : 200V ± 1V

LE19 inch Direct POINT : 27.0KV ± 0.5KV Indirect POINT : 210V ± 1V

Measure high voltage with the indirect point (LOCATION: TP501). If you need, use the soft Jig.

4-1-1 (f) G2 (SCREEN) VOLTAGE

Adjust G2 voltage with screen VR of FBT up to the voltage of 570V (17 inch) 530V (19 inch)

LE17IS/LE19IS/LE19IT 4-1

4 Alignment and Adjustments

4-2 Display Control Adjustments

4-2-1 Display Control Adjustments

4-2-1(a) HOW TO ADJUST THE SCREEN

Refer to the contents from 4-2-1 to 4-2-9.

1. Choose the MDL file of the relevant model on MDL file.

2. Delete the user.

3. Dump the stand mode from the soft jig geometry mode.

4. Save the all mode after adjusting the screen in the standard mode (68 kHz / 85 Hz).

5. Savethe mode after adjusting the screen in the other modes.

Notice : Don't save the all mode after adjusting the

other mode.

4-2-2(b) TERMS OF THE SCREEN ADJUSTMENT

Scanning frequency: 68 kHz / 85 Hz Screen: Latticed pattern Brightness: The minimum (Cut-off) Image: The maximum

4-2-2 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: see table 4-3. 1024 x 768 mode (68 kHz / 85 Hz)

4-2-2 (b) VERTICAL SIZE ADJUSTMENT

Click on the << or >> box next to V_SIZE to adjust the vertical size of the display pattern to 234 mm / 264 mm. (Tolerance : ± 3 mm)

4-2-2 (c) HORIZONTAL POSITION ADJUSTMENT

Click on the << or >> box next to H_POSI to center the horizontal image on the raster.

4-2-2 (d) VERTICAL POSITION ADJUSTMENT

Click on the << or >> box next to V_POSI to center the vertical image on the raster.

4-2-3 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 Table 4-1, an image will appear distorted, elongated or squashed.

Horizontal Linearity = 2x x100

Vertical Linearity = 2x x100

Preset mode

Pre-load mode (48 kHz~) ≤ 5% ≤ 10%

X max-X min

X max+X min

Y max-Y min

Y max+Y min

Table 4-2.

Adjacent Linearity

≤ 4% ≤ 8%

Entire Linearity

Adjust the horizontal position and vertical

Pre-load mode (under 48 kHz) ≤ 5% ≤ 14%

position to ≤ 4.0 mm of the center point of the screen.

❈ Preset Mode : 68 kHz / 85 Hz

|A-B| ≤ 4.0 mm. |C-D| ≤ 4.0 mm.

DISPLAY AREA

EDGE OF BEZEL

Pre-load Mode : Refer to Timing Chart

4-2-3 (a) HORIZONTAL LINEARITY ADJUSTMENT

To adjust the Horizontal Linearity, refer to Table 4-1 for the tolerance range.

Click on the << or >> box next to H_LIN to

Figure 4-3. Centering

optimize the image.

Table 4-3.

(Horizontal x Vertical Size Table)

4-2-2 (a) HORIZONTAL SIZE ADJUSTMENT

17” 19”

Click on the << or >> box next to SIZE B+ to adjust the horizontal size of the display pattern to 312 mm / 356 mm (Tolerance: ± 3 mm) as the “H_SIZE” is “60” on the OSD.

Horizontal 312 352

Vertical 234 264

4-2 LE17IS/LE19IS/LE19IT

4 Alignment and Adjustments

4-2-3 (b) VERTICAL LINEARITY ADJUSTMENT

To adjust the Vertical Linearity, refer to Table 4-1 for the tolerance range. Use control bar after selecting “V_LINEARITY BAL” in left menu to optimize the image.

4-2-4 Trapezoid Adjustment

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

| A - B | < 5 mm

Figure 4-4. Trapezoid

4-2-5 Pinbalance Adjustment

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

| D1 |, | D2 | ≤ 2.0 mm

D1 D2 D1

4-2-7 Side Pincushion Adjustment

Use control bar after selecting “PINCUSHION” in left menu to straighten the sides of the image area.

| C1 |, | C2 | ≤ 2.0 mm, | D1 |, | D2 | ≤ 2.0 mm.

D2D1

4-2-9 Degauss

No adjustments are available for the degaussing circuit. The degaussing circuit can effectively function only once per 30 minutes.

Figure 4-7. Pincushion

4-2-9 Save the Data

To save the adjustment data for factory frequencys, press FACTORY SAVE.

4-2-10 To Delete the User Mode Data

Figure 4-5. Pinbalance

4-2-6 Parallelogram Adjustment

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

4 mm

Figure 4-6. Parallelogram

To delete the adjustment data from the user modes, click “@4: USER DELETE” in right menu.

LE17IS/LE19IS/LE19IT 4-3

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