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| Thread ID: 39965 | 2003-11-23 05:12:00 | shaking screen??? | Roseyglow (2770) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 194164 | 2003-11-23 05:12:00 | Fom the moment I put on my computer 1st thing in the morning until I switch it off at night the screen shimmers?? This has gone on now for months any advice?? | Roseyglow (2770) | ||
| 194165 | 2003-11-23 05:25:00 | Could your refresh rate have changed? Right click on your desktop, choose Properties, Settings, Advanced, Monitor and check the refresh rate in there. That is for Win XP but it would be fairly similar in other Windows versions. ;-) | Fire-and-Ice (3910) | ||
| 194166 | 2003-11-23 05:26:00 | This is a common effect if the monitor is within an external magnetic field of something thats connected to the mains. You can usually ignore the main computer box in this. Try moving the monitor as far as you can from side to side, forward to back to see of it makes it better or worse. What do you have within a few feet (say up to 3 or 4 ft) from the monitor (in any direction) thats connected to the power? Look for plug packs, stereos, etc. What is on the wall behing the computer? Is there a swichboard, is the meterbox on the wall behind the computer (on either side of the wall). I have also seen this when the incoming mains cable runs under the floor or through the wall near the monitor. In my office, the main switchboard is through the wall behing the monitors. Its only the fact I use LCD panels that I don't see a shimmer, and the only fix would be moving the computer. I used to get quite annoyed by the shimmer when using an ordinary monitor, but knew what was causing it. |
godfather (25) | ||
| 194167 | 2003-11-23 05:37:00 | Another thing to consider ..... The screen may shimmer when a nearby phone receives a text message or a call. J :D |
Jester (13) | ||
| 194168 | 2003-11-23 05:41:00 | Ummm. Just a thought. Do you have unsheilded speakers close to the monitor You may also be getting RF interference from a TV being close. Just my thoughts and I may be well off track. |
Elephant (599) | ||
| 194169 | 2003-11-23 06:48:00 | Try unplugging your speakers and see if it changes. An internal AC transformer can cause it. | bmason (508) | ||
| 194170 | 2003-11-23 06:50:00 | As the poster noted, it happens from the time the monitor is switched on until it is switched off again, this would eliminate interference from a cellphone unless one was very busy receiving calls all day . Cellphones "call home" every few minutes, and could show for very brief periods only . It should eliminate a TV as well unless one is a TV addict! It could emanate from a cellphone wall plugpack charger though (earlier transformer type, most are switchmode now) . Interference from speaker magnets will not cause shaking, only fixed distortion and colour purity issues . Shimmering and shaking comes from an alternating magnetic source, not a fixed magnetic source . Mains powered devices produce a magnetic field that alternates 50 times per second, and when that intrudes into the sweep field of a CRT beam, shimmer results . You need to imagine the monitor is in the centre of a sphere with a radius of about 3 to 6 feet . What else is in that sphere that could do it? |
godfather (25) | ||
| 194171 | 2003-11-23 07:22:00 | My 1994 PC General 15" shimmered (but admittedly no all the time) until I got some dry joints re-soldered . The effect was very similar to when a signal was being received by a cell phone . How old is your monitor? |
JohnD (509) | ||
| 194172 | 2003-11-23 07:32:00 | > You need to imagine the monitor is in the centre of a > sphere with a radius of about 3 to 6 feet. > What else is in that sphere that could do it? Hi Roseyglow Godfather is correct in his advice, however there are some common conditions that can affect your monitor from outside of that 1-2 metre sphere. If you live in an inner city suburb with overhead powerlines within 3 metres of your home then they may be the cause. Similarly, if you are close to or beneath high tension power lines they too will cause your problem. There are also some relatively common wiring problems within houses that can do it too, but they are not usually present all day. They tend to appear only when power consumption is highest. The fastest test for external electromagnetic field interference is to increase your screen refresh rate to 75 or 85 Hz temporarily to see if the shimmer effect diminishes. You access this adjustment by right clicking on a blank area of your desktop and selecting Properties/Settings/Advanced/ Monitor/Refresh frequency (W2K & probably Win XP) or Properties/Settings/Advanced/ Adapter/Refresh frequency for Win 9x. If you can't get it higher in frequency because your monitor or video card don't support fast refresh rates, try reducing it to 56Hz and see if that makes it worse. It doesn't matter which way you confirm the cause, only that you prove what the cause is. Post again if you still have problems and I may be able to help further. I have some specialist expertise in this area. Cheers Billy 8-{) |
Billy T (70) | ||
| 194173 | 2003-11-23 08:00:00 | I was waiting for you to arrive Billy T You do do well as does Godfather. |
Elephant (599) | ||
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