REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
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Friday, 28 August 2020

SAMSUNG DP15H, SAMSUNG DP17L COMPUTER MONITOR SERVICE ADJUSTMENTS FULL SCHEMATIC WITH VOLTAGE CHART


 15 inch and 17 inch Samsung CRT type computer monitors circuit diagram and service adjustment procedure

15-Inch (38 cm): 13.8-inch (35 cm) viewable, 17-Inch (43 cm): 16-inch (40.6 cm) viewable, Full-square flat-face tube, 90˚ Deflection, Semi- tint, Non-glare, Invar shadow mask, Anti-static silica coating, 0.28 mm Dot pitch.

15” ; Horizontal : 267 mm ± 4 mm, Vertical : 200.5 mm ± 4 mm

17” ; Horizontal : 306 mm ± 4 mm (4:3 ratio), Vertical : 230.5 mm ± 4 mm.

Alignment and Adjustments.

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.

The following equipment may be necessary for adjustment procedures:

Display control adjustment

1. Non-metallic (Ð) 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. Software: Softjig or DM200

6. Interface Board Ver. 2.0 Code No. BH81-90001K

7. Parallel communications cable (25-pin to 25-pin); Code No. BH81-90001H

8. Signal cable (15-pin to 15-pin cable with additional 3-pin connector); Code No. BH81-90001J

9. 5 V DC adapter, not supplied

10. Personal computer

Note: Softjig AssÕy (includes items 6, 7 and 9)

Code No. BH81-90001L.

colour adjustments

1. All equipment listed in  (a), above

2. Color analyzer, or any luminance measurement equipment.

Connecting the SoftJig

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

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.
High voltage adjustment

Signal: 1024 x 768 (68 kHz/85 Hz) (17”)

800 x 600 (54 kHz/85 Hz) (15”)

Display image: Don” care

Contrast: Minimum

Brightness: Minimum

Limit: 26.5 kV ± 0.2 kV (17”)

25 kV ± 0.2 kV (15”)

exception) 26.0 kV ± 0.2 kV for 17” SDD CRT that the DY type is DMX-1791AT

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 following procedure.

Turn the power off and disconnect the AC line cord from the power source.

2. Turn the power on after connecting high voltage Probe.

3. Using the jig, adjust the high voltage to the specification.

* High Voltage Adjustment PROCEDURE using Softjig

1 Select matching model name in “Model” field.

2 Select “ @7: Zero Beam” in menu after selecting “Extra 1”

3 Adjust high voltage using control bar after selecting “HV MIN”

4 Turn the power off/on after adjustment finished.

5 Check the high voltage has been fixed with adjusted value after reselecting “@7: Zero Beam”

Screen voltage adjustment

Signal: 1024 x 768 (68 kHz/85 Hz) (17”)

800 x 600 (54 kHz/85 Hz) (15”)

Display image: Don’t care

Contrast: Minimum

Brightness: Minimum

Limit: 26.5 kV ± 0.2 kV (17”) 25 kV ± 0.2 kV (15”)

Screen Voltage adjustment procedure using softjig is all the same as 4-2-1 but selecting “G2 CONT” on the contrary to “HV MIN”
Centre raster

Adjust SW401 so that the back raster comes to the centre when you apply each basic mode for 15” and 17”
Cantering
Cantering means to position the centre point of the display in the middle of the display area.
Horizontal size and position and vertical size and position control the cantering of the display.
Adjust the horizontal size and vertical size to their optimal settings: 306 mm (H) x 230 mm (V) for 17”, 267 mm (H) x 200 mm (V) for 15”.
Adjust the horizontal position and vertical position to ² 4.0 mm of the centre point of the screen.
* In Softjig window, “Geometry” has to be selected for GD adjustment.
Horizontal size adjustment
Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum.
Use control bar after selecting “H-SIZE” in left menu to adjust the horizontal size of the display pattern to 306 mm (17”) and 267 mm (15”). (Tolerance: ± 3 mm.)
If “H-SIZE” is not enough to adjust it, select “SIZE B+” by turns.
Vertical size adjustment
Conditions
Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)
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 230 mm (17”) and 200 mm (15”). (Tolerance: ± 3 mm.)
Horizontal position adjustment
Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)
Display image: Crosshatch pattern
Use control bar after selecting “H-POSITION” in left menu to centre the horizontal image on the raster.
Vertical position adjustment

Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)

Display image: Crosshatch pattern

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

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  an image appears distorted, elongated or squashed.
Horizontal linearity adjustment

Scanning frequency: 68 kHz/85 Hz (17 “) 54 kHz/85 Hz (15”)
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum
To adjust the Horizontal Linearity, refer to Tables for the tolerance range.
Increase or decrease H-LIN to optimize the image.
Vertical linearity adjustment
Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum
To adjust the Vertical Linearity, refer to Tables for the tolerance range.
Use control bar after selecting “V-LINEARITY BAL” in left menu to optimize the image.
Trapezoid Adjustment
Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum
Use control bar after selecting “TRAPEZOID” in left menu to make the image area rectangular.
Pin balance Adjustment
Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum.
Use control bar after selecting ‘PINBALANCE “ in left menu to optimize the image.
Parallelogram Adjustment

Scanning Frequency: 68 kHz/85 Hz (17 “) 54 kHz/85 Hz (15”)

Display image: Crosshatch pattern

Brightness: Maximum

Contrast: Maximum

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

Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)
Display image: Crosshatch pattern
Use control bar after selecting “PINCUSHION” in left menu to straighten the sides of the image area.
Tilt Adjustment

Scanning Frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)

Display image: Crosshatch pattern

Brightness: Maximum

Contrast: Maximum

Use control bar after selecting “ROTATION” in left menu to correct the tilt of the display.

Degauss

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

To Delete the User Mode Data

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

Save the Data

To save the adjustment data for a mode, press “@3: ALL MODE SAVE” in right meant.

Colour Adjustments

CAUTION: Check below condition before colour adjustment

Video signal :  Analog 0.7 Vp-p (at 75 Ω)

Sync : TTL level (H, V seperate signal)

* Select “Colour” in Softjig menu for colour adjustment.

Colour Coordinates (Temperature)

Colour temperature is a measurement of the radiant energy transmitted by a colour. For computer monitors, the colour temperature refers to the radiant energy transmitted by white. Colour coordinates are the X and Y coordinates on the chromaticity diagram of wavelengths for the visible spectrum.

Measurement instrument: Colour analyser

Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)

Display image: White flat field at centre of display area

Luminance: Maximum

Procedure

Use the directions in sections 4-3-2 through 4-3-3 to adjust the color coordinates for:

9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02

6500K to x = 0.313 ± 0.02, y = 0.329 ± 0.02

Colour Adjustments for 9300K

4-3-2 (a) back raster colour adjustment

Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)

Display image: Back raster pattern

Brightness: Maximum

Contrast: Maximum

Select “@1: CHANNEL 1” in right menu to control the colour for 9300K.

2. Adjust the luminance of the back raster to between 0.5 to 0.7 ft-L using control bar after selecting “GREEN CUTOFF” in the menu.

3. Use control bar after selecting “BLUE CUTOFF” in left menu to set the “y” coordinate to 0.298 ± 0.02.

4. Use control bar after selecting “RED CUTOFF” in left menu to 0.283 ± 0.02.

* If colour values would not be matched desirable values, repeat sequence 3 and 4 after readjusting “GREEN CUTOFF” control a little different.

White balance adjustment

Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)

Display image: White box pattern

Brightness: 0.06ft-L at Back Raster

Pattern Display

Contrast: Maximum
Use control bar after selecting “RED GAIN”, “GREEN GAIN” and “BLUE GAIN” to adjust the luminance to 45 ft-L (15”) and 46 ft-L (17”) with the color coordinates ranged for

9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02.
exception) 17” SDD CRT type-named (*/S-2) : 42ft-L.
ABL adjustment
Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)
Display image: Full white pattern
Brightness: Maximum
Contrast: Maximum
Check the ABL. If it is not within the Specifications, use the ABL controls to adjust it. (15”: 33 ± 1 ft-L, 17”: 36 ± 1 ft-L )
2. Select “@4: COLOR SAVE” to save the data.
3. Select “@6: ALL COLOR SAVE” to save the CH2.
White balance adjustment verification

Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)

Display image: Back raster pattern Full White Pattern

X-Y Coordinates: x = 0.283 ± 0.02,

y = 0.298 ± 0.02

ABL Luminance Refer to 4-3-2(c)

Brightness: Maximum

Contrast: 5 ft-L, 24 ft-L

Check whether the colour 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.

3. Select “Geometry” in softjig menu.

4. Select “@7: 5-ft “ in right menu.

5. Check whether the white coordinates of the video meet the above coordinates spec.

6. Select “@8: 24-ft “ in right menu.

7. 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.

Select “Colour” and click “@2: CHANNEL 2” for colour adjustment for 6500K

Repeat the sequence of 9300K adjustment.

The luminance values the same as 9300K, but the colour coordinated of back raster and white box are : x = 0.313 ± 0.02 y = 0.329 ± 0.02.

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.

Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)

(1024 x 768)

Display image: White flat field

Brightness: Cut off point at 24 ft-L

Contrast: Maximum.

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

Scanning frequency: 68 kHz/85 Hz (17”)
54 kHz/85 Hz (15”)
(1024 x 768)
Display image: “H” character pattern
Brightness: Cut off point
Contrast: Maximum
1. Adjust the Focus VR on the FBT to display the sharpest image possible.
2. Use Locktite to seal the Focus VR in position.
Colour Purity Adjustment
Colour purity is the absence of undesired colour.
Conspicuous misleading (unexpected colour in a uniform field) within the display area shall not be visible at a distance of 50 cm from the CRT surface.
Orientation: Monitor facing east
Scanning frequency: 68 kHz/85 Hz (17”) 54 kHz/85 Hz (15”)
Display image: White flat field
Luminance: Cut off point at the centre of the display area.
Note: Color purity adjustments should only be attempted by qualified personnel.
Use the following procedure to correct minor colon 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 (see Figure).
3. Make sure the spacing between the PCM assembly and the CRT stem is 29 mm ± 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 ± 0.015, y = 0.594 ± 0.015)
6. Repeat steps 4 and 5 using a red pattern and then again, using a blue pattern.
7. When you have the PCMs properly adjusted, carefully glue them together to prevent their movement during shipping.
Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and re inspect.
2. Check the following circuits.
• No raster appears: Power circuit, Horizontal output circuit.
• High voltage develops but no raster appears: Video output circuits.
• High voltage does not develop: Horizontal output circuits.
Wiring diagram

SMPS (Power regulator) schematic