shakey monitor

[Matt]

Hey There,

I recently moved to a new apartment and noticed my Samsung 955df has a
bad case of the shakes! I tried moving my monitor to the other side of
the apartment and it stopped shaking. So I am guessing its the power
lines outside. Since I can't really keep my computer in the kitchen,
is there something I can do to stop the monitor from shaking?

I tried putting it at a different refresh rate and it seems to go like this:

60hz - no shakes
65hz - slow wavey
70hz - a little faster
85hz - super fast
100hz - no shakes

it all seems to strange to me. Any help would be great!

thanks,
matt

 

[Mike Walsh]

Hey There,

I recently moved to a new apartment and noticed my Samsung 955df has a
bad case of the shakes! I tried moving my monitor to the other side of
the apartment and it stopped shaking. So I am guessing its the power
lines outside. Since I can't really keep my computer in the kitchen,
is there something I can do to stop the monitor from shaking?

I tried putting it at a different refresh rate and it seems to go like this:

This does seem like it has something to do with the power line frequency since the shake seems to be the difference between the power line frequency and refresh rate.

60hz - no shakes - same as power line frequency
65hz - slow wavey - shakes a 5 hz
70hz - a little faster - shakes at 10 hz
85hz - super fast - shakes at 25 hz
100hz - no shakes - shakes at 40 hz, too fast to see, or maybe too little shake to be noticed

it all seems to strange to me. Any help would be great!

thanks,
matt

--

When replying by Email include NewSGrouP (case sensitive) in Subject

Mike Walsh
West Palm Beach, Florida, U.S.A.

 

[half_pint]

Would some sort of metal casing or shield around the monitor help?
I am thinking it might 'block' the interference, on the other hand it
might make it worse!!

Also maybe you can get the power company to shift it's cables
(I'm serious), maybe it is your brain which has gone wavey and
the monitor is fine?

I live under a power line but it hasn't affected me though. :O|

 

[MrB]

Would some sort of metal casing or shield around the monitor help?
I am thinking it might 'block' the interference, on the other hand it
might make it worse!!

Also maybe you can get the power company to shift it's cables
(I'm serious), maybe it is your brain which has gone wavey and
the monitor is fine?

I live under a power line but it hasn't affected me though. :O|

Are you sure?

 

[half_pint]

Are you sure?

Well it obviously hasn't effected your sharp wit :O|

 

[Matt]

I doubt the power company will uproot all the telephone poles because my
monitor shakes. They should dammit!

i dont really know where i could get a metal sheild.

my main monitor (LCD) is rock solid, but then again its digital.... so
who knows.

any help would be great.

matt

 

[Michael Culley]

60hz - no shakes
65hz - slow wavey
70hz - a little faster
85hz - super fast
100hz - no shakes

Run it at 100Hz?

 

[kony]

I doubt the power company will uproot all the telephone poles because my
monitor shakes. They should dammit!

i dont really know where i could get a metal sheild.

my main monitor (LCD) is rock solid, but then again its digital.... so
who knows.

any help would be great.

matt

Have you tried moving it within the same general location, left
and right or rotating it 90' ?

 

[Matt]

I want to run at 1280x1024.... but max refresh is 75

 

[Noozer]

Hey There,

I recently moved to a new apartment and noticed my Samsung 955df has a
bad case of the shakes! I tried moving my monitor to the other side of
the apartment and it stopped shaking. So I am guessing its the power
lines outside. Since I can't really keep my computer in the kitchen,
is there something I can do to stop the monitor from shaking?

Got any fluorescent lights nearby? They flicker and can make a monitor look
like this. Any large appliances nearby?

How far can you move the monitor with it connected? Have you tried moving it
a few feet either way to see if there are changes? How about turning the
monitor? Any difference?

 

[Mike Walsh]

Run at 60 Hz. The problem you are having is the reason televisions run at 60 fields per second.

I want to run at 1280x1024.... but max refresh is 75

--

When replying by Email include NewSGrouP (case sensitive) in Subject

Mike Walsh
West Palm Beach, Florida, U.S.A.

 

[Zotin Khuma]

Hey There,

I recently moved to a new apartment and noticed my Samsung 955df has a
bad case of the shakes! I tried moving my monitor to the other side of
the apartment and it stopped shaking. So I am guessing its the power
lines outside. Since I can't really keep my computer in the kitchen,
is there something I can do to stop the monitor from shaking?

I tried putting it at a different refresh rate and it seems to go like this:

60hz - no shakes
65hz - slow wavey
70hz - a little faster
85hz - super fast
100hz - no shakes

it all seems to strange to me. Any help would be great!

thanks,
matt

I'm inclined to think the power lines outside are less likely to be
the culprit than other sources of interference inside the house. Any
strong alternating magnetic field at mains frequency could cause this.
Possibilities are transformers - wall warts, amplified speakers
(specifically the power supply transformer), your music system -,
motors (the 'fridge e.g.). Any of these placed close to your monitor
will produce the shakes.

The change in "shake speed" at different refresh rates apparently
confirms that it's of mains origin. It will shake at the difference
frequency between your refresh rate and the mains. 60Hz - no diff,
therefore no shake; 65Hz - shake at 5Hz; and so on. At 100Hz you may
have simply failed to notice the 40Hz flicker.

The trick of course is to isolate the offending appliance. Hope this
helps.

 

[Matt]

thanks Zotin,

what you say makes perfect sense to me. My office has the
heating/cooling unit in it. I am guessing thats probably the cause of
my shakes. Now that I have the problem pin-pointed, is there something
i can do to shield the cooling/heating unit so it doesn't interfere?

sadly i cant run my monitor at 60hz, its just to painful (eyestrain).

thanks for your help!

matt

 

[Matt]

60hz is painful to look at! especially when i have to spend 8 hours a
day looking at it.

i need another solution.

thanks though.

 

[half_pint]

I doubt the power company will uproot all the telephone poles because my
monitor shakes. They should dammit!

I don't see why not, there are rules an regulations regarding power lines
and there concerns involving their safty (cancer risks etc....)
whether you would succeed depends on how much your government is
in the pocket of big business (how corrupt it is).

If it is the powerlines, then clearly it is affecting your quality of life
and
you *should* sue.
The power lines might also affect a heart pacemaker for instance!!

Ask if the fat cat running the power company has power lines
running outside his house.


Your LCD monitor is rock solid because it does not use an
electron beam (which is deflected by electromagnetism) to
illumenate the display (the liquid crystals are hard wired).

You can make a a metal shield of sorts any old metal sheets
would do, baking trays, the side panels of your computer
tower case, maybe even aluminium cooking foil might be worth a
try.
It might of course make it worse in which case try something pretty
solid and not metalic.
Also the orientation of the monitor might make a difference.

Incidently my computer monitor affects my medium wave radio
but I can eliminate it by rotating the radio or by moving it out of line
of site (behind the sofa).

Anyway play around with it and see what difference you can make.

 

[kony]

60hz is painful to look at! especially when i have to spend 8 hours a
day looking at it.

i need another solution.

thanks though.

LCD monitor, move monitor, or buy/build yourself something like
this:
http://www.lessemf.com/computer.html

 

[Matt]

Hey There,

I recently moved to a new apartment and noticed my Samsung 955df has a
bad case of the shakes! I tried moving my monitor to the other side of
the apartment and it stopped shaking. So I am guessing its the power
lines outside. Since I can't really keep my computer in the kitchen,
is there something I can do to stop the monitor from shaking?

I tried putting it at a different refresh rate and it seems to go like
this:

60hz - no shakes
65hz - slow wavey
70hz - a little faster
85hz - super fast
100hz - no shakes

it all seems to strange to me. Any help would be great!

thanks,
matt

Here is a possibility, I guess, but I don't know that it is consistent
with all your observations. A power converter, power adapter,
transformer, wall wart, whatever you call it can make waves in a CRT
display. Maybe you have the DC converter for your speakers near the
monitor? I don't know that the effect varies with the refresh rate ...

 

[Jon Danniken]

thanks Zotin,

what you say makes perfect sense to me. My office has the
heating/cooling unit in it. I am guessing thats probably the cause of
my shakes. Now that I have the problem pin-pointed, is there something
i can do to shield the cooling/heating unit so it doesn't interfere?

Line a cardboard box with aluminum foil and put it over the emmiting or receiving unit, allowing for
proper airflow. If it works, you might look into a prettier solution like the link kony gave up above.

p.s. Please stop top-posting, you're giving me a headache.

Jon

 

[Zotin Khuma]

Line a cardboard box with aluminum foil and put it over the emmiting or receiving unit, allowing for
proper airflow. If it works, you might look into a prettier solution like the link kony gave up above.

I haven't tried this out but I don't think it'll work. The Al foil
will shield some of the electric field but not the magnetic component
which is the main reason for Matt's woes.

Matt, at the moment I can't think of any practically feasible
solution, esp without knowing how your heating/cooling unit is
constructed. In theory, a shield of magnetic material like a thick
sheet of soft iron or silicon steel (similar to transformer
laminations) around the monitor should work, but is probably not very
practicable. If such material were somehow available, air flow in and
out of the monitor should not be obstructed. In any case, the material
need not be wrapped tightly around the monitor.

Have you tried different locations and orientations within the room ?
It just might be possible to minimise the effect of the interfering
field on the electron beam inside your monitor's CRT by changing its
direction relative to the beam.

Zotin