Electrical Adjustments - Philips 109P2 CM25 GSIII Service Manual

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 35 factory-preset modes as below
.
31.469 KHz/70.087 Hz, 640 X 350
81.250 KHz/65.000 Hz, 1600 X 1200
31.469 KHz/59.941 Hz, 640 X 480 83.640 KHz/59.999 Hz, 1792 X 1344
31.468 KHz/70.084 Hz, 720 X 400 85.938 KHz/85.002 Hz, 1280 X 960
37.5 KHz/75 Hz, 640 X 480 86.333 KHz/59.995 Hz, 1856X 1392
87.500 KHz/70.000 Hz, 1600 X 1200
37.861 KHz/72.810 Hz, 640 X 480
37.861 KHz/85.081 Hz, 640 X 350 90.000 KHz/60.000 Hz, 1920 X 1440
37.879 KHz/60.317 Hz, 800 X 600
91.146 KHz/85.024 Hz, 1280 X 1024
37.927 KHz/85.039 Hz, 720 X 400 93.750 KHz/75.000Hz, 1600 X 1200
43.269 KHz/85.008 Hz, 640 X 480 106.250KHz/85.00 Hz, 1600 X 1200
46.875 KHz/75.000 Hz, 800 X 600 106.270KHz/74.997Hz, 1792 X 1344
48.077 KHz/72.188 Hz, 800 X 600
48.363 KHz/60.004Hz, 1024X 768
49.722 KHz/74.546Hz, 832 X 624
50.628 KHz/100.10 Hz, 640 X 480
53.674 KHz/85.061 Hz, 800 X 600
56.476 KHz/70.069 Hz,1024X 768
60.000 KHz/60.000 Hz,1280 X 960
60.023KHz/75.029Hz, 1024 X 768
63.923 KHz/100.00 Hz, 800 X 600
63.981KHz/60.020Hz, 1280 X 1024
67.500 KHz/75.00Hz, 1152 X 864
68.677KHz/84.997Hz, 1024 X 768
68.681KHz/74.979Hz, 1152 X 870
71.809KHz/76.15 Hz, 1152 X 900
75.000KHz/60.000 Hz, 1600 X 1200
79.976KHz/75.024 Hz, 1280 X 1024
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
1. B+ supply voltage (3157) 210Vdc
- 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 3157(B+) and 3698(EHT)
in mid-position.
- Set Vg2 (screen) to fully Counter-clockwise (zero
beamcurrent).
- Connect a dc voltmeter between the joint of capacitor 2131
and ground (common ground).
- Set the B+ trimming potentiometer 3157 so that the reading
on the dc voltmeter is 210 V +/- 0.5 Vdc.
2. High-voltage EHT (3698)
- 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.
- Turn off the power.
Back

Electrical Adjustments

- 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 "high-
voltage 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.
3. Monitor the following auxiliary voltages.
SOURCE ACROSS C2362 + 8.0V +/- 0.5VDC.
SOURCE ACROSS C2143 + 5.0V +/- 0.5VDC.
SOURCE ACROSS C2362 +12.0V+/- 0.5VDC.
SOURCE ACROSS C2134 +15.0V +/- 1.0VDC.
SOURCE ACROSS C2137 - 15.5V +/- 1.0VDC.
SOURCE ACROSS D6148"+" 6.3 V+/- 0.5VDC.
SOURCE ACROSS C2131 + 210.0V +/-1.5VDC.
SOURCE ACROSS C2133 + 82.7 V +/-2.0VDC.
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
Equatorial Support
4.4 All voltages are to be measured or applied with respect to
ground.
Note: Do not use heatsink as ground.
4.5 Adjust function controls "
for contrast control which should be set to MAX.
5. To access factory mode:
- Turn off monitor (don't turn off PC)
- Press "
control panel, then press "
with characters " factory mode (below OSD menu)" come
on the screen of monitor.
- If OSD menu disappears on the screen of monitor, press
"
screen again.
- using "
- Using "
109P2 GS3 CM25
9
Go to cover page
: H=0, V=0
" to center position except
" and " " simultaneously on the front
",wait till the OSD menu
00195
109P V3.08 000601
" again (anytime), then the OSD menu comes on the
" : to select OSD menu.
: to increase or decrease the setting.
" to confirm the selection.
13
mG, Z=0
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