Philips Monitor

Ok.....

this is the problem i keep having with this philips monitor. its a 107 x4 and very randomly and yet not all the time, it shakes.... as if its being degaused but only on a very small scale, and it keeps going for however long....

now, because there are alot of random things, like how long it shakes and when i cant put it down to anything. i cant find anything around thats causing any interferance, degausing the monitor doesnt help...... the off button doesnt seem to work. lol, its the computer at work :P

i was wondering if there were any problems with this and if anyone knew how to fix it?


any other questions about it just let me know and i will try and answer them for you...

it also has Lightframe(TM) 3. it does the same thing with this option disabled in the monitor bios, and with the software installed or not present.....

By any chance have you got a set of speakers near by.?.
If so move them a lil further away from the monitor.

Another thing could it be your Graphics Card playing up?
I ask this because on one of my other Box's the screen started to suffer little fits, like yours is suffering.
And it turned out the Graphics Card was just on it's way out, so maybe try a new/different Graphics Card and post result's please.

f2b:.

speakers, yes. even a mobile phone. but these arent creating the problem.... i have moved everything and tried all... as i said, i cant find anything interfering with it... unless it was something large next door or across the street, but if its that large, it would be used for a moment and then stop at random.

i really hope the graphics card isnt on its way out... being a work computer it wont get fixed until its gone.

thanks anyways....

Black Bugs?

you know the transformers for all the techno crap you can have around the desk.. Any of this should be at least 12inches (30cm) from the monitor..

some power cables running near the back of the monitor and or parrallell with the Video cable from the PC, but the symptoms for this would be more like a horizontral tearing (ie a straight vertical line woulbe jagged at a close instection)

ANY magnetic field near the Monitor.. even a faulty degausing controller in the monitor could cause it.. If when you hit the degauss button is it a mild action or vey noticable? if mild.. like the effect of pressing the degauss 1-2 mins after another press..suspect the degauss cct..

is the effect over the whole screen or concentrated in one corner or the bottom or the top..

What happens if you give the side of the monitor a Firm tap (like a homer simpson DOH slap in the forhead).. any thing happen then?

incoherient Undies again..

cheers

Do you have an office cooling fan near it? I have seen them mess with monitors when the cooling fan was about to burn out.

Quote:

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Do you have an office cooling fan near it? I have seen them mess with monitors when the cooling fan was about to burn out.

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I've had a monitor screen literally blow out in front of me before..
certainly taught me not to put a huge fan right next to the monitor ;)

i am fairly positive i have covvered everything... the disruption is concentrated around the outside, while the center stays firmly still... but its not the degause controller either, it seems to work fine, and as far as im aware its always been like this.

if it was something causing electrical interferance, why is it at random. nothing is switched on or off, everything is pretty much constant.

and when it starts playing up i have unplugged everything to see if it stopped and nada.

and hitting the monitor? (yeh I know I am cruel..but I jest NOT)

possables are the deflection yoke, Monitor PSU and a poor contact on the EHT plug on the tube.. (the later will cause "blooming" picture will balloon out and shrink varing in brightnes dependent on picture information), A psu fault (one of many symptoms from this area) as well as a fault from the HV cct will give the effect of the picture blooming again but this will be at a 25 - 100 hz rate and not be nearly as affected by picture information..

In other words.. other than tryiong the monitor on another PC - dif location.. You have a monitor problem.. ..off with its head..

Cheers

I think that undies is probably right, it sounds like a dud monitor, so you will need to test it somewhere else and try a different monitor on your PC to determine if it is the monitor, your location, or even the monitor/video card combination.

Another thought, is there a neon light on the same power circuit (that is, the plugs on the wall, not the PC set up)...........someone's desk lamp for instance? Also are their other machines on the same circuit that are unaffected (that would tell you the monitor is faulty)

just a thought

thanks guys, will look into getting a new monitor. i just had a quick word with the boss, and apparently previous monitors have done this. its been replaced, i dont know what exactly yet, so its possible the vid card was never replaced and thats the problem. or it still could be interferance on something ive missed.

however, i will keep you posted on any more info i get from the boss. im gonna make a call to the mob who did the monitor cause its been reported before....

sorry im sketchy on the details, it was a quick convo... will keep your posted :)

You wouldn't happen to have large and powerful AC units along with refrigrators on that same circuit would you?

A condition known as "dirty power" can possibly cause the effects you mentioned. This is where the AC sine-wave gets heavily skewed from strong non-linear loads. If you have a power-conditioning active UPS you should plug the monitor into it and see if it solves the problem. Or take the monitor home and try it out there. If it cleans up and stops shaking, chances are it is an issue with this dirty power stuff. Some monitors are more susceptable to it than others, usually depends on how powerful their PSU is and the size of it's capacitors, etc.

Anyways, hopefully your next monitor deals with whatever the issue is better than this one. :)

Following on from Tim_axe:

Computers and their peripherals should be on a 'clean' circuit.
That is, a circuit solely for them. Plus, the earth continuity conductor [ECC] should also be a 'clean' varient, in that it should travel back to where the power enters the building, and preferably, it should go right back to the incoming transformers.

This is because the PC is a delicate beast, and in an industrial setting, with a lot of inductive loads [AC motors, fluorescent lighting etc] then the AC can get a little out of whack.

Initially the [V] volts and [I] amps are in phase ( or close as make no difference ) after an inductive load, the amps begin to 'lag' the volts. This leads to a situation wherein the sine wave will effectively have two peaks, one for V, and one for I. To combat this, capacitor banks are fitted (their size requirements are calculated with regard to the area load v inductive load)
Capacitive loads have the opposite effect to inductive, in that the volts lag the amps.

If the calcs are correct, then the site would be in balance. Another reason to do this is if you have your 'two' peaks hitting the meters, you pay for each hit ...............
That is, you are paying extra money for something that you never got.

As for the 'clean' earth, this is because electricity is basically lazy. If there is an electrical short to earth, anywhere on the system, the fuse will blow. But, before it blows, the entire ECC system will raise its potential to the same as the mains voltage, and it will all flow to the nearest earth point. This is a safety feature to prevent you touching a high potential piece of metal, and a low potential piece of metal at the same time. As ALL exposed metalwork will be at the same potential.

If the system is ABCDEFGH, and the PC's are in section D, and you get a short in any of the other sectors, then the entire system will liven up. This means that fault current will travel through the PC area, with all their attendant spikes, causing mayhem in their passing.

In a clean earth situation, the ECC from sector D will go direct to the start of the system - A.
Now if a short occurs anywhere, the clean earth is NOT bonded to earth at the PC's it is only bonded at the incoming end, this means that the electrical fault current cannot flow up to the PC's as there is no path. Fault currents can only flow OUT.............

Get an Elec/Tech with an oscillascope[sp] to test the AC in your area, you SHOULD have a nice smooooth sine wave, with little or no spikes. [spikes = noise = nastiness] Check it whilst normal running conditions prevail, then check with everything OFF.

Confirm that you have a clean earth. One that runs from the PC's direct to the incoming point for the buildings AC power. And is only bonded at the incoming end, it should be a 'floating' earth at your end.

A 'dirty' power supply will kill systems just as quick as it will kill you.

[edit] A quick fix is to use a VDR [voltage dependant resistor] in your monitor plug top, across the line and neutral. This will act like an 'overflow' or a Zener diode, in that if the volts stays constant, then the VDR will allow all to pass through, if there is a spike in the line, the VDR will allow only what its rated for, and the rest will be allowed to pass across the VDR to the neutral pin.[/edit]

thanks foxyloxey and yea, im pretty uptodate on electronics ;)

thanks guys, will keep an eye out on whats going on.. yes, the monitor is and has been plugged into the ups with supports the monitor and computer only... and still same effects etc etc...

i'll let you know what happens if anything does :)