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Service Hints & Tips |
Document ID: GSMH-399FYQ |
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This document is provided to IBM and our Business Partners to help sell and/or service IBM products. It is not to be distributed beyond that audience or used for any other purpose. |
IBM Monitor display tilt factors
Applicable to: World-Wide
Service Information:
Slight iterations of tilt are becoming more noticeable in newer monitors since users are being given the ability to adjust video width and height out to bezel edges. This allows a direct comparison of video squareness with bezel edge squareness. This is especially true in newer software applications using full screen reverse video.
Cathode ray tube (CRT) monitors may have some permissible horizontal tilt that is perceivable by the customer. The following is a list of some of the factors which may combine to affect what is perceived as "tilt":
1. Integrated Tube Component (ITC) - This is the CRT and Deflection Yoke assembly. The rotational position of the Deflection Yoke on the neck of the CRT determines (mechanical) tilt within the ITC assembly. This adjustment of tilt is fixed and cannot be changed.
2. ITC and Bezel assembly - The ITC is mounted into the monitor bezel by locating it against physical references molded into the bezel (locating tabs). The bezel edges effectively become the final reference for determining tilt in manufacture of the monitor. This tilt factor is guarded closely during manufacturing.
3. The magnetic environment of the monitor - All factory screen setups are performed with the monitor located within a neutralized magnetic environment to minimize any external influences from the Earth's magnetic field or other magnetic sources.
The magnetic environment consists of:
a. The local geomagnetic* field (northern hemisphere, southern hemisphere, equatorial, possible local magnetic anomalies or disturbances, etc.)
b. Local magnetic variations caused by large metal objects, small electrical appliances in close proximity to the monitor and local power lines and ormers.
c. The physical orientation of the monitor in relation to magnetic north. (Rotating the monitor in a different directions and allowing it to automatically degauss, can make a perceptible difference in tilt.)
d. The current magnetic state of the monitor itself (Does it require degaussing?).
Summary:
The aim of the manufacturing and alignment processes referenced above is to minimize these variations as much as possble. However, these combinations of factors mean that no monitor can ever be absolutely perfect.
Note:
No image quality assessments should be done on any monitor that has not been turned-on for at least 20 minutes.
* Geomagnetic: Magnetism associated with the Earth's natural magnetic field.
SAS KEYWORDS:
PSY2 PS2 PSY2DISP PSVP
PSVPDISP D/T8517 D/T8515 D/T9515
CRT TUBE MONITOR D/T8506
D/T8503 D/T8512 D/T8513 D/T8514
D/T8515 D/T8517 D/T9517 D/T8508
D/T8504 D/T6312 D/T6314 D/T6319
D/T9507 D/T6321 D/T6318 D/T6317
D/T9524 D/T9525 D/T9521 D/T9527
D/T6327 D/T8504 D/T9504 D/T8525
D/T6319 DJAM
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Hint Category |
General Information | |
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Date Created |
24-08-94 | |
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Last Updated |
20-01-99 | |
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Revision Date |
20-01-2000 | |
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Brand |
IBM Monitors | |
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Product Family |
P Series (P50/P70/etc.), Personal System/2, Size labeled (14R/15V/etc.) | |
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Machine Type |
9507, 8504, 6321, 6322, 6540, 6542, 8516, 9514, 9524, 6315, 6541, 6543, 6546, 6553, 9525, 9516, 6327, 6544, 6547, 6554, 6556, 9527, 6549, 6557 | |
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Retain Tip (if applicable) |
H122146 | |
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