Electrical Adjustments
Go to cover page
11
V40 107P5
1. General
2.
3.0 Main chassis alignment
Input signal mode
Factory preset modes : 11
Resolution modes H. freq. V. freq. H. V.
1. 720 x 400 31.5 Khz 70Hz (VGA) - +
2. 640 x 480 31.5 Khz 60 Hz (VGA) - -
3. 800 x 600 35.2 Khz 56 Hz (Mac- ) + +
4. 640 x 350 37.9 Khz 85 Hz (VESA) + -
5. 640 x 480 43.3 Khz 85 Hz (VGA) - -
6. 800 x 600 46.9 Khz 75 HZ(VESA) + +
7. 800 x 600 53.7 Khz 85 HZ(VESA) + +
8. 1024 x 768 60.0 Khz 75 HZ(VESA) + +
9. 1024 x 768 68.7 Khz 85 HZ(VESA) + +
10. 1280 x 1024 80.0 Khz 75 Hz (VESA) + +
11. 1280 x 1024 91.2 Khz 85 Hz (VESA) + +
3.1 Power supply adjustment
3.1.1 Set Vg2 manually (screen) to fully counterclockwise (zero
beam current).
3.1.2 Apply 80KHz/75Hz full black pattern.
3.1.3 Monitor the following auxiliary voltages.
3.2 H-Deflection supply voltage adjustment
3.2.1 Apply 80KHz /75Hz 1280 x 1024 full black pattern.
Adjust manually to obtain +/-0.3V for SDI CRT
152V +/-0.3V for LG CRT
across C2600 at zero beam current.
3.3 Picture geometry and EHT regulation adjustment
+197.0V source across C2152 and gnd +197.0V +/- 3.0 VDC
+ 82.5V source across C2151 + 82.5V +/- 1.5 VDC
+ 6.2V source across C2155 + 6.2V +/- 0.2 VDC
+ 12.2V source across C2153 +12.2V +/- 0.7 VDC
- 12.2V source across C2154 - 12.2V +/- 0.7 VDC
R3561 48V
3.3.1 EHT regulation adjustment
At 1280 x 1024 80KHz/75Hz mode full black pattern
Use DC voltage meter to measure socket 1681 Pin 1.
Adjust VR 3699
To get 4.7V +/- 0.05V at socket 1681 pin 1.
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=-520 mG, Z=0
4.4 All voltages are to be measured or applied with respect to ground.
4.5 Adjust brightness controls to center position except for contrast
control which should be set to MAX.
Note: Do not use heatsink as ground.
4.6 Any external voltage sources should have a low internal
impedance.
4.7 Adjust function controls to center position unless otherwise
stated.
4.8 The white balance and purity has to be adjusted in dully lighted
room.
4.9 All alignments have to be done in a room with a temperature of
25+/- 10 C.
0
5. To access factory mode
To leave factory mode
5.1 Turn off monitor (don't turn off PC)
5.2 Press '" " and " " simultaneously on the front control
panel,then press " ",wait till the OSD menu with characters
V40 109F5 V0.45 20030410 (below OSD menu)" come on the
screen of monitor.
5.3 If OSD menu disappears on the screen of monitor, press " "
again (anytime), then the OSD menu comes on the screen again.
5.4 Using " " : to select OSD menu.
5.5 Using " " : to increase or decrease the setting.
5.6 Using " " to access/confirm the selection.
5.7 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).
MODEL SELECT
Factory
Mode
Indicator
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/Trapezoid/pincushion/balance pincushion/paralleogram
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 get optimum
corner geometry.
6.4.7 Adjust the parallelogram by I CBUS to get optimum vertical line.
6.4.8 Adjust the balance pincushion by I C BUS to get optimum
vertical line.
6.4.9 Adjust the trapezoid to get optimum vertical line.
6.5 Adjust size/centering/trapezium/pincushion/parallelogram
of all other preset modes via I C bus.
(to repeat from step 6.4.1 to step 6.4.9)
2
2
2
2
2
V40 107P5 V0.45 20031013
http://jdwxzlw.5d6d.com/?fromuser=华盛维修
To Next Page
Loading...
