Philips p23_25 Datasheet

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Electrical Adjustments

105B2 CM23 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. 720 x 400 31.5 kHz/70 Hz 640 x 480 31.47 kHz/60 Hz 640 x 480 43.3 kHz/85 Hz 800 x 600 46.9 kHz/75 Hz 800 x 600 53.8 kHz/85 Hz 1024x768 60.0 kHz/75 Hz 1280x1024 64.0kHz/60Hz 1024x768 68.7kHz/85Hz

factory-preload modes as below

14 640 x 350 31.5 kHz/70 Hz 800 x 600 48.1kHz/72Hz 640 x 350 37.9 kHz/85 Hz 800 x 600 63.9kHz/100Hz 640 x 480 37.5 kHz/75 Hz 832 x 624 49.7kHz/75Hz 640 x 480 37.9 kHz/73 Hz 1024x768 48.4kHz/60Hz 640 x 480 50.6kHz/100Hz 1024x768 56.5kHz/70Hz 720 x 400 37.9kHz/85Hz 1152x864 67.5kHz/75Hz 800 x 600 37.9kHz/60Hz 1280x960 60.0kHz/60Hz

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 640 x 480,

31.5 kHz/60 Hz (only) as signal source.

0.3 AC/DC Measurement: The measurements for AC waveform and DC figure is based on 640 x 480 31.5 kHz/60 Hz resolution mode with test pattern "gray scale". Power input: 110V AC

3.Monitor the following auxiliary voltages.

SOURCE ACROSS C2153 and GRN +183.0V +/- 1.5 VDC SOURCE ACROSS C2156 +81.0V +/- 0.5 VDC. SOURCE ACROSS C2164 +6.2V +/- 0.3 VDC. SOURCE ACROSS C2158 +12.7V +/- 0.5 VDC. SOURCE ACROSS C2162 - 12.7V +/- 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=450 mG, Z=0 Southern hemisphere : H=0, V=-500 mG, Z=0 Equatorial Support : H=0, V=0 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:

- 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.

00562

1. B+ supply voltage

- Apply a video signal in the 640 x 480 with 31.5 kHz/60Hz mode.

- Select the "cross-hatch" pattern.

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

- Pre-set trimming potentiometer R3178(B+) and R3540 (EHT)

in mid-position.

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

- Connect a dc voltmeter between the joint of capacitor C2156 and ground (common ground).

- Set the B+ trimming potentiometer R3178(B+) so that the reading on the dc voltmeter is 81V +/- 0.2 Vdc.

2. High-voltage EHT

- Apply a video signal in the 640 x480 with 31.5 kHz/60Hz mode.

- Select the "cross-hatch" pattern.

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

- Turn off the power.

- Connect a dc voltmeter between the joint of capacitor C2643 and

ground (common ground).

- Turn on the power.

- Set the EHT trimming potentiometer R3540 so that the reading on

the dc voltmeter is 66.5V +/-0.2V for PHI CRT(67V for CPT CRT).

MODEL SELECT

105BS V2.37 20000510

- 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.

- Using " " to confirm the selection.

5.1. To leave factory mode

* 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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105B2 CM23 GSIII

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Electrical Adjustments (Continued)

6. Picture geometry setting

- Apply a video signal with cross-hatch pattern.

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

6.3 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 270 mm

6.4.2 Adjust the H-phase to center position.

6.4.3 Adjust V-size to 202mm.

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 via I C bus.

6.6 Preset factory preload timing 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 60 kHz/75 Hz mode,

select the "full white pattern" (sizes 270 x 202 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 = 25%, R gain = 65% (I C) G cutoff = 25%, G gain = 65% (I C) B cutoff = 25%, B gain = 65% (I C)

6500 K R cutoff = 25%, R gain = 55% (I C) G cutoff = 25%, G gain = 55% (I C) B cutoff = 25%, B gain = 55% (I C)

Brightness = 50%, Sub-Contrast = 85%, ABL = 50% (I C)

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

simulaneously to entert the character "105BS V2.37

20000510 " 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.

MODEL SELECT

105BS V2.37 20000510

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9300 BIAS R G B GAINRGB 6500 BIAS R G B GAINRGB FOCUS(H V) VLIN BAL USER RASTER(H V) LIN ( H V ) SUB SUB

H EHT VE (HILI SHARP) EXIT 174

T CORNER ABL

Fig. 2.2

BIASRGB:R(red) G(green) B(blue) cutoff GAINRGB:R(red) G(green) B(blue) gain FOCUS : Horizontal and 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 T CORNER: Corner Correctionof TOP ABL : Auto Beam Limit H EHT : Horizontal Extensive High Tension VE : Intensity and sharpness of lightframe

( the value must be under 5)

(Before you make an adjustment of VE s value of intensity or sharp.

Please make sure the VE function has enable properly by entering

Model Select submenu that will show you it is active or not.) A red

square near by VE means function active. Refer to the Fig. As below.

MODEL SELECT

105B2 69K TCO

105B2 69K MPR2

105S2 60K TCO

105S2 60K MPR2

RESERVE

SWDDC

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 77 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 Vg2 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.

7.6 Set CA100 high R,G,B scale 100 = 41+/- 1FL,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 have the same reading 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.

7.8.1 Adjust SUB-CON to get Y=41+/- 1FL

7.8.2 Apply full white pattern, Adjust ABL to reach 30+/- 1FL(contrast

at Max.)

Adjust 6500K color:

7.9

With the help of a factory calibrated color analyzer CA 100 set low R,G,B scale 100=0.12FL,x=313,y=329

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Electrical Adjustments (Continued)

105B2 CM23 GSIII

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7.10 Adjust the 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+/- 1FL,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 Check full white at contrast and brightness at minimum, the

foreground shall be extinguished.

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.

- 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.

10. 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.

11. 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.

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.

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

Beam displacement direction

6-pole

Magnetic flux lines

Beam motion producced by the 6- pole convergence magnet

G R

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