Philips p21_p23 Datasheet

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Electrical Adjustments

107P CM25 GSIII

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0. General

When carry-out the electrical settings in many cases a video signal must be applied to the monitor. A computer with :

- ATI GPT-1600 (4822 397 10065), Mach 64 (up to 107kHz)

are used as the video signal source. The signal patterns are selected from the "service test software" package, see user guide 4822 727 21046 (GPT-1600).

0.1 This monitor has 8 factory-preset modes as below. 800 x 600 46.9 kHz/75 Hz 800 x 600 53.7 kHz/85 Hz

1024 x 768 60.0 kHz/75 Hz 1024 x 768 68.7 khz/85 Hz 1280 x 960 85.0 kHz/85 Hz 1280 x 1024 80.0 kHz/75 Hz 1280 x 1024 91.1 kHz/85 Hz 1600 x 1200 93.8 khz/75 hz

0.2 With normal VGA card:

If not using the ATI card during repair or alignment, The service engineer also can use this service test software adapting with normal standard VGA adaptor and using standard VGA mode 1024 x 768,

68.7 kHz/85 Hz (only) as signal source.

0.3 AC/DC Measurement:

3.Monitor the following auxiliary voltages.

SOURCE ACROSS C2152 and GND. +185.0V +/- 1.5 VDC SOURCE ACROSS C2154 + 82.0V +/- 1.5 VDC. SOURCE ACROSS C2156 - 6.4 V +/- 0.3 VDC. SOURCE ACROSS C2160 +13.5V +/- 0.5 VDC. SOURCE ACROSS C2157 - 14.0V +/- 0.5 VDC.

4. General conditions for alignment

4.1 During all alignments, supply a distortion free AC mains voltage to set via an isolating transformer with low internal impedance.

4.2 Align in pre-warmed condition, at least 30 minutes warm-up with nominal picture brightness.

4.3 Purity, geometry and subsequent alignments should be carried out in magnetic cage with correct magnetic field.

Northern hemisphere : H=0, V=430 +/- 50 mG, Z=0 Southern hemisphere : H=0, V=-520 +/-50 mG, Z=0

4.4 All voltages are to be measured or applied with respect to ground.

Note: Do not use heatsink as ground.

4.5 Adjust brightness controls to center position except for contrast control which should be set to MAX.

5. To access factory mode:

The measurements for AC waveform and DC figure is based on 1024 x 768 68.7 kHz/85 Hz resolution mode with test pattern "gray scale". Power input: 110V AC

1. B+ supply voltage (3165) 84Vdc

- Apply a video signal in the 1024 x 768 with 68.7 kHz/85Hz mode.

- Select the "cross-hatch" pattern.

- Set the brightness control and the contrast control to the minimum position.

- Pre-set trimming potentiometer 3165(+) and 3698(EHT)

in mid-position.

- Set Vg2 (screen) to fully Counter-clockwise (zero beamcurrent).

- Connect a dc voltmeter between the joint of capacitor 2152 and ground (common ground).

- Set the B+ trimming potentiometer 3165 so that the reading on the dc voltmeter is 185 V +/- 0.2 Vdc.

2. High-voltage EHT (3698)

- Apply a video signal in the 1024 x 768 with 68.7kHz/85Hz mode.

- Select the "cross-hatch" pattern.

- Set the brightness control and the contrast control to the minimum position.

- Connect a "high-voltage voltmeter" between the high-voltage connection of the picture tube and earth.

- Turn on the power.

- Set the EHT trimming potentiometer 3698 so that the "highvoltage voltmeter" reads 25.0 kV +/- 0.2 kV .

- Turn off the power.

- Remove the "high-voltage voltmeter" from the picture tube.

- Turn on the power again.

- Turn off monitor (don't turn off PC)

- Press " " and " " simultaneously on the front control panel ,then press " ",wait till the OSD menu with characters

" factory mode (below OSD menu)" come on the screen of monitor.

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G S 3 107P V 2.24 991015G S 3 107P V 2.24 991015

- If OSD menu disappears on the screen of monitor, press " " again (anytime), then the OSD menu comes on the screen again.

- using " " : to select OSD menu.

- using " " : to increase or decrease the setting.

(Please also refer to page 8 to page 15 for OSD adjustment)

- Using " " to confirm the selection.

5.1. To leave factory mode

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After alignment of factory mode, turn off monitor (if you do not turn

off monitor, the OSD menu is always at the factory mode), then turn on monitor again (at this moment, the OSD menu goes back to user mode).

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107P CM25 GSIII

Electrical Adjustments (Continued)

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6. Picture geometry setting

- Apply a video signal with cross-hatch pattern.

- Apply a video signal in the 1024 x 768 with 68.7 kHz/85 Hz mode.

- Set contrast control at Max. position, and brightness control in the mid-point.

6.4 Alignment of horizontal geometry and vertical geometry

6.4.1 Adjust the H-width to 306 mm

6.4.2 Adjust the H-phase to center position.

6.4.3 Adjust V-size to 230mm.

6.4.4 Adjust V-Position to center.

Adjust/Trapezium/pincushion

6.4.5 Adjust picture tilt via I C BUS for correct top/bottom lines.

6.4.6 Adjust the top and bottom corner by I C to straight vertical lines

of the left and right edge.

6.4.7 Adjust the parallelogram by I CBUS to get optimum vertical

line.

6.4.8 Adjust the unbalance pin by I C BUS to get optimum vertical

line.

6.4.9 Adjust the unbalance Vertical linearity balance by I C BUS to

get optimum vertical linearity balance.

6.4.10Adjust the unbalance Vertical linearity by I C to get optimum

vertical linearity.

6.5 Adjust size/centering/trapezium/pincushion/parallelogram

of all other preset modes (TABLE1-TABLE8) via I C bus.

6.6 Preset factory preload timin TABLE9-TABLEE22 according to

step 6.5 values.

7. Alignment of Vg2 cut-off point, white tracking

Equipment : 1. Video Test Generator-801GC (Quantum Data)

2. Color-analyzer (Minolta CA-100)

VG2 [(screen), at the bottom of the L.O.T.].

* Apply a video signal in the 1024 x 768 with 68.7 kHz/85 Hz mode,

select the "full white pattern" (sizes 306 x 230 mm).

* Use color-analyzer (Minolta CA-100) to adjust cutoff and

white uniformity.

OSD R/G/B cut-off and R/G/B gain can be accessed, with initial data:

9300 K R cutoff = 128%, R gain = 170% (I C) G cutoff = 128%, G gain = 170% (I C) B cutoff = 128%, B gain = 170% (I C)

6500 K ,5

500 K same as 9300 K R cutoff = 128%, R gain = 170% (I C) G cutoff = 128%, G gain = 170% (I C) B cutoff = 128%, B gain = 170% (I C)

Brightness = 50%, Sub-Contrast = 170%, ABL = 130% (I C)

Step 1: To press power button switch and left & right

simulaneously to entert the character "FACTORY MODE" as shown in Fig.2.1, press " " to access the OSD menu for R/G/B gain & cutoff as shown in Fig. 2.2.

Step 2: Press " " for function selection as shown in Fig. 2.2.

G S 3 107P V 2.24 991015G S 3 107P V 2.24 991015

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9300 BIAS R G B GAINRGB 6500 BIAS R G B GAINRGB 5500 BIAS R G B GAINRGB FOCUS(H V) VLIN BAL USER RASTER(H V) LIN ( H V ) SUB V(OFFSET GAIN) SUB CORNER(T B) ABL H EHT EXIT 114

Fig. 2.2

BIASRGB:R(red) G(green) B(blue) cutoff GAINRGB:R(red) G(green) B(blue) gain V FOCUS : Vertical Focus VLIN BAL : Vertical Linearity Balance USER : Horizontal size range RASTER H: Horizontal DC (raster) Shift RASTER V: Vertical DC (raster) Shift HLIN : Horizontal Linearity V LIN : Vertical Linearity SUB : Zoom range SUB : Sub Contrast V OFFSET : Vertical offset V GAIN : Vertical Gain ABL : Auto Beam Limit T CORNER: Corner Correctionof TOP B CORNER: Corner Correctionof BOTTOM H EHT : Horizontal Extensive High Tension

7.2 Connect the video input, set brightness control at center, and contrast control at maximum

7.3

set R,G,B cut-off at 127 9300k and 6500K(EEPROM preload value)

R,G,B gain at 180 9300k and 6500K(EEPROM preload value) ABL at 127 9300k and 6500K(EEPROM preload value) SUB-CON at 218 (EEPROM preload value)

7.4 Adjust 9300K color:

With the help of a factory calibrated color analyzer CA 100 set low R,G,B scale 100=0.12FL,x=283,y=297 Adjust Vg1 until brightest gun at 100 on low brightness scale.

7.5 Adjust R,G,B cut-off for all gun reading to get 100 on low brightness scale.

7.5 Adjust R,G,B cut-off for all gun reading to get 100 on low

brightness scale.

7.6 Set Ca100 high R,G,B scale 100 = 41+/- 6FL,X=283,y=297

Adjust G gain at 100 scale on high brightness scale.

7.7 Adjust R,B gain so that blue and green havng as red on the high brightness scale

7.8 Set contrast at minimum and repeat 7.5,7.6,7.7,until RGB three guns get same readings on low and high brightness scale.

7.9

Adjust 6500K color:

With the help of a factory calibrated color analyzer CA 100 set low R,G,B scale 100=0.12FL,x=313,y=329 Adjust Vg1 until brightest gun at 100 on low brightness scale.

7.10 Adjust R,G,B cut-off for all gun reading to get 100 on low brightness scale.

7.11 Set CA100 high R,G,B scale 100 = 41+/- 6FL,X=313,y=329 Adjust G gain at 100 scale on high brightness scale.

7.12 Adjust R,B gain so that blue and green have the same reading

as red on the high brightness scale

7.13 Set contrast at minimum and repeat 7.10,7.11,7.12,until RGB

three guns get same readings on low and high brightness scale.

7.14 Adjust SUB-CON to get Y=41+/-6FL.

7.15 Apply full white pattern, adjust ABL to reach 30 +/- 5FL(C MAX.)

7.16 Check full white at contrast and brightness at minimum, the

foreground shall be extinguished.

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Electrical Adjustments (Continued)

107P CM25 GSIII

9 Go to cover page

8. Focus adjustment

Apply a signal of"@"character. at 68.7 kHz/85 Hz mode set the brightness to mid-position , contrast to max - position and adjust the focus for optimal sharpness in the area within 2/3 from the screen center.

9. Loading DDC code

The DDC HEX data should be written into the EEPROM (7803,7804) by EEPROM writer or equivalent method.

a: Service DDC Kit

DDC Module (DDC cable), Part number = 4822 320 12004

DDCV2u.EXE software (3.5" disk), Part number = 4822 711 00024

b: Please refer to Service information 4822 727 21995 for using

the Service DDC Kit.

10. To access service mode

The service mode is for service purpose which convenient to perform repair service and pre-warm up monitor before test or re-adjustment colour temperature without any video signal generator requirement.

10.1 Remove video signals

10.2 Press " " and " " simultaneously on the front control panel ,then press " ",release all bottons till the full white pattern come on the screen of monitor.

10.3 In the beginning of service mode (full white pattern), the monitor will working at 47kHz of horizontal frequency, after 55 seconds, it will switch to 86kHz automatically, then change mode between two modes constantly every 55 seconds.

10.4 You may quit service mode by either turn off and on or feed video signals to the monitor.

11. Purity adjustment

- Make sure the monitor is not exposed to any external magnetic field.

- Produce a full red pattern on the screen, adjust the purity magnet rings on the PCM assy (on CRT) to obtain a complete field of the color red. This is done by moving the two tabs (2-pole) in such a manner that they advance in an opposite direction but at the same time to obtain the same angle between the two tabs, which should be approximately 180 degree.

- Check by full green pattern and full blue pattern again to observe their respective color purity.

Setting

- Before the static convergence setting can be made, the monitor must be switched on for 30 minutes.

- The focus setting must be made correctly.

- Signal: 640 * 480, 31.5 kHz/60 Hz mode.

- Set the tabs of the 4-pole magnet in the neutral

position. This is when the tabs are opposite one another. In this position the magnets do not affect the deflection of the R and B electron beams.

- Set the tabs of the 6-pole magnet in the neutral

position. This is when the tabs are opposite one another. In this position the magnets do not affect the deflection of the R, B, and G electron beams.

- First set the 4-pole magnet optimally.

- Then set the 6-pole magnet optimally.

- If the convergence is not now optimal, then adjust to

the optimal setting with the 4-pole magnet and then with the 6- Pole magnet again.

- Set the tabs of the 6-pole magnet in the neutral

position. This is when the tabs are opposite one another. In this position the magnets do not affect the deflection of the R, B, and G electron beams.

- First set the 4-pole magnet optimally.

- Then set the 6-pole magnet optimally.

- If the convergence is not now optimal, then adjust to

the optimal setting with the 4-pole magnet and then with the 6- pole magnet again.

2-pole purity magnet 6-pole convergence magnet 4-pole convergence magnet Deflection Yoke

4-pole Beam motion producced by the

4-pole convergence magnet

12. Static convergence

Introduction Slight deviation in the static convergence can be corrected by using two permanent pairs of magnets which are fitted around the neck of the CRT. These are the 4-pole magnet and the 6-pole magnet. The 4-pole magnet move the outermost electron beams (R and B) parallel in the opposite direction from the other. The 6-pole magnet moves the outermost electron beam (R, B and G) parallel in the opposite direction from the other. The magnetic field of the above magnets do not affect the center of the CRT neck.

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Beam displacement direction

6-pole

Beam motion producced by the 6- pole convergence magnet

Magnetic flux lines

G R

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