PG17HS9U_ADJUST.pdf part of Samsung 750P SAMSUNG PG17HS9U.zip, Schematic text manual preview

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4 Alignment and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor. Direction is given for adjustment 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) MAGNETIC FIELDS Whenever possible, use magnetic field isolation equipment such as a Helmholtz field to surround the monitor. If a Helmholtz field is not available, frequently degauss the unit under test. Caution: Other electrical equipment may cause external magnetic fields which may interfere with monitor performance. Use an external degaussing coil to limit magnetic build up on the monitor. If an external degaussing coil is not available, use the internal degaussing circuit. However, do not use the internal degaussing circuit more than once per 30 minutes. 4-1-1 (c) 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 (d) SIGNAL Analog, 0.7 Vp-p positive at 75 ohm, internal termination Sync: Separate/Composite (TTL level negative/positive) Sync-on-Green: Composite sync 0.3 Vp-p negative (Video 0.7 Vp-p positive) 4-1-1 (e) SCANNING FREQUENCY Horizontal: 30 kHz to 115 kHz (Automatic) Vertical: 50 Hz to 160 Hz (Automatic) Unless otherwise specified, adjust at the 1024 x 768 mode (H: 68 kHz, V: 85 Hz) signals. Refer to Table 2-1 on pages 2-2 and 2-3.

4-1-1 (f) HIGH VOLTAGE ADJUSTMENT Signal: 1024 x 768 mode (68 kHz/85 Hz) Display image: Full white Contrast: Maximum Brightness: Maximum Limit: 27.3 kV ą 0.5 kV (17Ó: 26 kV ą 0.5 kV) Measure the hight voltage level at the anode cap. High voltage should be within the limit as above. If the high voltage needs adjustment use the Softjig. 4-1-1 (g) G2 (SCREEN) VOLTAGE ADJUSTMENT Signal: 1024 x 768 mode (68 kHz/85 Hz) Display image: Full white Contrast: Maximum Brightness: Maximum Adjust the Screen VR of the FBT so that the G2 (Screen) Voltage for Toshiba it is 540 V ą 10 V. 4-1-1 (h) CENTER RASTER Adjust VR401 so that the back raster comes to the center when you apply a signal of 91 kHz/85 Hz.

PG17H* G2 PG19S* PG19R* G2

SDD 525V MEC 560V

TOSHIBA 635V SDD 530V

PG17**/PG19**/PG21**

4-1

4 Alignment and Adjustments 4-1-1 (i) BRIGHTNESS AND CONTRAST Unless otherwise specified, adjust control volumes: Brightness: Maximum Contrast: Maximum Note: The signal cable connector which includes the 3-wire cable must connect to the monitor. If you use Setup 2 (PC only, no signal generator) you can only make adjustments to the signal timing available on that computer system. To make corrections to all factory timings requires the use of an additional signal generator.
MONITOR INTERFACE BOARD VER. 2.0 5V DC ADAPTOR PARALLEL CABLE PC SIGNAL GENERATOR SIGNAL CABLE

4-1-2 Required Equipment
The following equipment may be necessary for adjustment procedures: 4-1-2 (a) DISPLAY CONTROL ADJUSTMENT 1. Non-metallic (Đ) screwdriver: 1.5 mm Non-metallic (Đ) screwdriver: 3 mm 2. Philips (+) screwdriver: 1.5 mm 3. Non-metallic hexkey: 2.5 mm 4. Digital Multimeter (DMM), or Digital Voltmeter (DVM) 5. Signal generator, or Computer with a video board that uses the ET-4000 chipset (strongly recommended if using Samsung DM 200 software) and that displays: 1280 x 1024 @ 85 Hz, or 1600 x 1200 @ 85 Hz (maximum). 6. Personal computer 7. Required software: Softjig.exe from Samsung which includes the SF9839TE.MDL (Toshiba CRT) data file Samsung DM200, or DisplayMate for Windows from Sonera Technologies 8. Interface Board Ver. 2.0 Code No. BH81-90001K 9. Parallel communications cable (25-pin to 25-pin); Code No. BH81-90001H 10. Signal cable (15-pin to 15-pin cable with additional 3-pin connector); Code No. BH81-90001J 11. 5 V DC adapter, not supplied Note: Softjig AssŐy (includes items 8, 9 and 10) Code No. BH81-90001L 4-1-2 (b) COLOR ADJUSTMENTS 1. All equipment listed in 4-1-2 (a), above 2. Color analyzer, or any luminance measurement equipmen

3-WIRE CABLE

Figure 4-1. Setup 1, With Signal Generator

MONITOR INTERFACE BOARD VER. 2.0 5V DC ADAPTOR SIGNAL CABLE PARALLEL CABLE PC D-SUB CONNECTOR 3-WIRE CABLE

Figure 4-2. Setup 2, Without Signal Generator

4-1-4

After Making Adjustments

4-1-3

Connecting the SoftJig

Connect the monitor to the signal generator and/ or PC as illustrated in Figures 4-1 and 4-2.

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. PG17**/PG19**/PG21**

4-2

4 Alignment and Adjustments

4-2 Display Control Adjustments
4-2-1 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: 352 mm (H) x 264 mm (V). 1280 x 1024 mode (91 kHz/85Hz) Adjust the horizontal position and vertical position to ˛ 4.0 mm of the center point of the screen. |A-B| ˛ 4.0 mm.
C DISPLAY AREA A B EDGE OF BEZEL D

4-2-1 (d) VERTICAL POSITION ADJUSTMENT CONDITIONS Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum Click on the << or >> box next to V_POSI to center the vertical image on the raster.

4-2-2 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 4-1 and 4-2, an image appears distorted, elongated or squashed. Table 4-1. Factory Preset Modes Linearity
Standard Modes Linearity Difference between adjacent blocks (4 %) Horizontal: 20.9~23.1 Horizontal: Less than 0.88 mm Vertical : 20.9~23.1 Vertical : Less than 0.88 mm Each block (10 %) Horizontal: 19.60~21.65 Horizontal: Less than 0.82 mm Vertical : 20.9~23.1 Vertical : Less than 0.88 mm

|C-D| ˛ 4.0 mm.

Figure 4-3. Centering
4:3

4-2-1 (a) HORIZONTAL SIZE ADJUSTMENT CONDITIONS Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum Click on the << or >> box next to H_SIZE to adjust the horizontal size of the display pattern to 352 mm. (Tolerance: ą 3 mm.) 4-2-1 (b) VERTICAL SIZE ADJUSTMENT CONDITIONS Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum Click on the << or >> box next to V_SIZE to adjust the vertical size of the display pattern to 264 mm. (Tolerance: ą 3 mm.) 4-2-1 (c) HORIZONTAL POSITION ADJUSTMENT CONDITIONS Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum Click on the << or >> box next to H_POSI to center the horizontal image on the raster.
5:4 5:4

Table 4-2. Other Modes Linearity: VGA, SVGA, XGA, MAC, etc.
Supported Timing Mode Each block (14 %) 4:3 Horizontal: 20.5~23.5 Vertical : 20.5~23.5 Difference between adjacent blocks (5 %) Horizontal: Less than 1.10 mm Vertical : Less than 1.10 mm

Horizontal: 19.18~22.07 Horizontal: Less than 1.03 mm Vertical : 20.5~23.5 Vertical : Less than 1.10 mm

4-2-2 (a) HORIZONTAL LINEARITY ADJUSTMENT CONDITIONS Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum To adjust the Horizontal Linearity, refer to Tables 4-1 and 4-2 for the tolerance range. Click on the << or >> box next to H_LIN to optimize the image.

PG17**/PG19**/PG21**

4-3

4 Alignment and Adjustments 4-2-2 (b) VERTICAL LINEARITY ADJUSTMENT CONDITIONS Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum To adjust the Vertical Linearity, refer to Tables 4-1 and 4-2 for the tolerance range. Click on the << or >> box next to V_LIN to optimize the image.

5 mm

Figure 4-6. Parallelogram

4-2-6 Side Pincushion Adjustment
CONDITIONS Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum Click on the << or >> box next to BARREL to straighten the sides of the image area.
| C1 |, | C2 | 2.0 mm, | D1 |, | D2 | 2.0 mm. C2

4-2-3 Trapezoid Adjustment
CONDITIONS Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum Click on the << or >> box next to TRAP to make the image area rectangular.
| A - B | < 5 mm A A

D1 B B

D2

Figure 4-4. Trapezoid

C1

4-2-4 Pinbalance Adjustment
CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 91 kHz/85 Hz Crosshatch pattern Cut-off Maximum

Figure 4-7. Pincushion

4-2-7 Tilt Adjustment
CONDITIONS Scanning Frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum Click on the << or >> box next to ROTATE to correct the tilt of the display.

| D1 |, | D2 | 2.0 mm

D1

D2

D1

4-2-8 Degauss
Figure 4-5. Pinbalance Click on the << or >> box next to PIN_BAL to optimize the image. No adjustments are available for the degaussing circuit. The degaussing circuit can effectively function only once per 30 minutes.

4-2-5 Parallelogram Adjustment
CONDITIONS Scanning Frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum Click on the << or >> box next to PARALL to make the image are rectangular.

4-2-9 To Delete the User Mode Data
To delete the adjustment data from the user modes, Press the MENU Button for the 10 Seconds .

4-2-10 Save the Data
To save the adjustment data for a mode, press FACTORY SAVE.

4-4

PG17**/PG19**/PG21**

4 Alignment and Adjustments

4-3 Color Adjustments
4-3-2 (b) G-GAIN ADJUSTMENT

4-3-1 Color Coordinates (Temperature)
Color temperature is a measurement of the radiant energy transmitted by a color. For computer monitors, the color temperature refers to the radiant energy transmitted by white. Color coordinates are the X and Y coordinates on the chromaticity diagram of wavelengths for the visible spectrum. CONDITIONS Measurement instrument: Scanning frequency: Display Size : Display image: Brightness: Contrast:

1/3H-1/2H FRONT BEZEL OPENING 1/3V-1/2V BACK RASTER GREEN WINDOW

Figure 4-8. Green Box Pattern CONDITIONS Scanning frequency: Display image: Brightness: Contrast:

Color analyzer 68 kHz/85 Hz 352 (H) x 264 (V) White flat field at center of display area Cut-off Maximum

68 kHz/85 Hz Green box pattern Cut-off Maximum

PROCEDURE Use the directions in sections 4-3-2 through 4-3-4 to adjust the color coordinates for: 9300K to x = 0.283 ą 0.02, y = 0.298 ą 0.02 6500K to x = 0.313 ą 0.02, y = 0.329 ą 0.02 5000K to x = 0.346 ą 0.02, y = 0.359 ą 0.02

1. Click on the << or >> box next to G_GAIN to adjust the brightness of the Green Gain to 25 ą 1 ft-L. Note: If you canŐt increase the Green Gain to the appropriate value, click on the >> box next to increase the ABL point. 4-3-2 (c) WHITE BALANCE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz Full white pattern Cut-off Maximum
FRONT BEZEL OPENING

4-3-2 Color Adjustments for 9300K
4-3-2 (a) BACK RASTER COLOR ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast:

68 kHz/85 Hz Back raster pattern Cut-off Maximum

BACK RASTER WHITE WINDOW

1. Select COLOR CHANNEL 1 to control the color for 9300K. 2. Adjust the luminance of the back raster to between 0.3 to 1ft-L using the G_CUT controls. 3. Click on the << or >> box next to B_CUT to set the ŇyÓ coordinate to 0.298 ą 0.02. 4. Click on the << or >> box next to R_CUT to set the ŇxÓ coordinate to 0.283 ą 0.02. Note: If the above adjustments cannot be done to each coordinate, click on the << or >> box next to G_CUT to decrease or increase the green cutoff (bias) and repeat procedures 2 and 3.

Figure 4-9. Full White Pattern 1. Click on the << or >> boxes next to R_GAIN and B_GAIN to make the video white. (For 9300K color adjustment: x = 0.283 ą 0.02, y = 0.298 ą 0.02.) Note: Do not touch the G_GAIN controls. 2. Check the ABL. If it is not within the specifications (30 ą 1 ft-L), use the ABL controls to adjust it. 3. Select COLOR FACTORY SAVE to save the data.

PG17**/PG19**/PG21**

4-5

4 Alignment and Adjustments 4-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION CONDITIONS Scanning frequency: Display image: X-Y Coordinates: Raster Luminance ABL Luminance Brightness: Contrast: 68 kHz/85 Hz Back raster pattern x = 0.283 ą 0.02, y = 0.298 ą 0.02 0.3 ~ 1ft-L 30 ą 1 ft-L Cut-off Maximum 4-3-3 (c) WHITE BALANCE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz Full white pattern Cut-off Maximum

1. Check whether the color coordinates of the back raster satisfy the above spec. If they do not, return to 4-3-2 (a) and readjust all settings. 2. Display a full white pattern. Note: Do not touch the G_GAIN controls.

1. Click on the << or >> boxes next to R_GAIN and B_GAIN to make the video white. (For 6500K color adjustment: x = 0.313 ą 0.02, y = 0.329 ą 0.02.) 2. Refer to the procedure for 9300K, section 4-3-2 (c) steps 2 and 3. 4-3-3 (d) WHITE BALANCE ADJUSTMENT VERIFICATION Refer to the procedure for 9300K, section 4-3-2 (d).

3. Adjust the Contrast Control on the monitor so that the luminance of the video is about 5 ft-L. 4. Check whether the white coordinates of the video meet the above coordinates spec. 5. Adjust the Contrast Control again so that the luminance of the video is about 20 ft-L. 6. Check whether the white coordinates of the video satisfies the above spec. If they do not, return to 4-3-2 (a) and readjust all settings.

4-3-4 Color Adjustments for 5000K
4-3-4 (a) BACK RASTER COLOR ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz Back raster pattern Cut-off Maximum

4-3-3 Color Adjustments for 6500K
4-3-3 (a) BACK RASTER COLOR ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz Back raster pattern Cut-off Maximum

1. Select COLOR CHANNEL 3 to control the color for 5000K. 2. Adjust the luminance of the back raster to between 0.3 to 1.0 ft-L using the G_CUT controls. 3. Click on the << or >> boxes next to R_CUT and B_CUT to adjust the R-Bias to x = 0.346 ą 0.02 and the B-Bias to y = 0.359 ą 0.02. 4-3-4 (b) G-GAIN ADJUSTMENT This procedure is the same as that for 9300K, refer to the procedure on page 4-5. Adjust the brightness of the G_GAIN less 5 ft-L than brightness of procedure for 9300K. 4-3-4 (c) WHITE BALANCE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz Full white pattern Cut-off Maximum

1. Select COLOR CHANNEL 2 to control the color for 6500K. 2. Adjust the luminance of the back raster to between 0.3 to 1.0 ft-L using the G_CUT controls. 3. Click on the << or >> boxes next to R_CUT and B_CUT to adjust the R-Bias to x = 0.313 ą 0.02 and the B-Bias to y = 0.329 ą 0.02. 4-3-3 (b) G-GAIN ADJUSTMENT This procedure is the same as that for 9300K, refer to the procedure on page 4-5.

1. Click on the << or >> boxes next to R_GAIN and B_GAIN to make the video white. (For 5000K color adjustment: x = 0.346 ą 0.02, y = 0.359 ą 0.02.) 2. Refer to the procedure for 9300K, section 4-3-2 (c) steps 2 and 3. PG17**/PG19**/PG21**

4-6

4 Alignment and Adjustments 4-3-4 (d) WHITE BALANCE ADJUSTMENT VERIFICATION Refer to the procedure for 9300K, section 4-3-2 (d). CONDITIONS Orientation: Scanning frequency: Display image: Luminance:

4-3-5 Luminance Uniformity Check
Luminance is considered uniform only if the ratio of lowest to highest brightness areas on the screen is not less than 7.5:10. CONDITIONS Scanning frequency: Display image: Display size Brightness: Contrast:

Monitor facing east 68 kHz/85 Hz White flat field Cut off point at the center of the display area

Note: Color purity adjustments should only be attempted by qualified personnel. PROCEDURE For trained and experienced service technicians only. Use the following procedure to correct minor color purity problems: 1. Make sure the display is not affected by external magnetic fields. 2. Very carefully break the glue seal between the 2-pole purity convergence magnets (PCM), the band and the spacer. 3. Make sure the spacing between the PCM assembly and the CRT stem is 29 mm ą 1 mm. 4. Display a green pattern over the entire display area. 5. Adjust the purity magnet rings on the PCM assembly to display a pure green pattern. (Optimum setting: x = 0.295 ą 0.015, y = 0.594 ą 0.015) 6. Repeat steps 4 and 5 using a red pattern and then again, using a blue pattern. Table 4-3. Color Purity Tolerances

68 kHz/85 Hz (1024 x 768) White flat field 352 (H) x 264 (V) Cut off point Maximum

PROCEDURE Measure luminance at nine points on the display screen (see figure below).

Figure 4-10 Luminance Uniformity Check Locations

4-3-6 Focus Adjustment
CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz ŇHÓ character pattern Cut off point Maximum

Red: Green: Blue:

x = 0.620 ą 0.015 x = 0.289 ą 0.015 x = 0.153 ą 0.015

y = 0.334 ą 0.015 y = 0.595 ą 0.015 y = 0.072 ą 0.015

PROCEDURE 1. Adjust the Focus VR on the FBT to display the sharpest image possible. 2. Use Locktite to seal the Focus VR in position.

(For 9300K color adjustment: x = 0.283 ą 0.02, y = 0.298 ą 0.02)

7. When you have the PCMs properly adjusted, carefully glue them together to prevent their movement during shipping.

4-3-7 Color Purity Adjustment
Color purity is the absence of undesired color. Conspicuous mislanding (unexpected color in a uniform field) within the display area shall not be visible at a distance of 50 cm from the CRT surface.

PG17**/PG19**/PG21**

4-7

4 Alignment and Adjustments

Memo

4-8

PG17**/PG19**/PG21**