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| Thread ID: 62612 | 2005-10-13 20:08:00 | Green tinge on the right-hand of my Monitor - How to remove it? | Chilling_Silence (9) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 395908 | 2005-10-14 10:15:00 | e - w Would that mean lying the monitor on it's side, so the screen is in potrait rather than landscape view? |
Morgenmuffel (187) | ||
| 395909 | 2005-10-14 18:38:00 | I've found Exit Mould works quite well on green tinges… :DOr paint stripper? | Greg (193) | ||
| 395910 | 2005-10-14 19:00:00 | And you say this "green tinge" appeared just after you brought a younger, slimmer model home? Hmmmmm, anyone else see the problem here? <Snicker> |
Freejack (375) | ||
| 395911 | 2005-10-14 19:04:00 | Touché Jack! :D | Greg (193) | ||
| 395912 | 2005-10-14 21:24:00 | Do NOT try this at home folks, all you would do would be stuff it up more. Static magnetic fields are a no-no. Only AC fields can demagnetise a CRT. Presuming you have degaussed a few times Chill, try rotating the screen to an E-W orientation, degauss again and report results (or phone me if you like). Could be a shifted shadowmask if it has been banged or bumped at all. Cheers Billy 8-{) Umm.. I have done this many many times with a screwdriver and it has fixed the problem described by Chill. |
CYaBro (73) | ||
| 395913 | 2005-10-14 22:44:00 | Umm . . I have done this many many times with a screwdriver and it has fixed the problem described by Chill . Umm . . . . Not to put too fine a point on it CYaBro, but this is a very rare condition and I sincerely doubt the "many many" times . A little hyperbole perhaps? There are only three main causes of a colour tinge on one side of a CRT: A localised static magnetic field (typically a speaker with unshielded magnet), a shifted or warped shadowmask (usually due to dropping or excessive time spent running at very high brightness and contrast) or internal fiddling with the purity controls . In many years of work I have wouldn't have seen more than 10 instances (collectively) . In a very mild case with a small area od colouration you might have some effect with a magnetised screwdriver, but that is a weak and very localised point-source and will not influence anything but the mildest magnetisation . Even then, it is a matter of chance whether the polarity of the field from the screwdriver will improve it or make it worse . Only a very strong alternating magnetic field can remove residual static magnetism, and the degauss field is very strong indeed . That rattle/hum you hear when degaussing is the force of the field physically vibrating the shadowmask (or aperture grille if it is a trinitron CRT) . Re Nigel's question, compass points are in a horizontal plane, and since the monitor must work in relation to the earth's magnetic field, lying it on its side wouldn't hep . The reason for turning E-W is to balance out the influence of the north and south magnetic poles (there are no east or west poles of course) . This puts the monitor into its optimum orientation for demagnetisation and if that doesn't let it produce a clean screen then it usually means that there is a more serious problem . If the screen is heavily magnetised, it can be necessary to use a degaussing wand, but I have seen even that fail for a shipment that sat next to a diesel electric loco and got thoroughly magnetised . I had to procure a heavy duty degaussing coil and even then it took several attempts on each to get it right . I still have that coil Chill if you want to borrow it, but try several degausses in the E-W orientation first . If you rotate the monitor slowly through 360 dgrees you will be able to tell if it is likely to help because at some point it will get better/worse, and if it gets better, there is hope . Go to This Site (http://www . oh-bugger . net . nz) and check on the red blue and green screens . One of them will make changes easier to see . Cheers Billy 8-{) |
Billy T (70) | ||
| 395914 | 2005-10-14 22:59:00 | Excellent Billy! Full of knowledge and insight, many thanks :-) I'll have a crack at it shortly, just have to finish off installing my car head-deck. Cheers Chill. |
Chilling_Silence (9) | ||
| 395915 | 2005-10-15 04:02:00 | Chill . . if it has a green tinge and the degaus won't work, it might be that the green gun is moved off center . . . deperming is not gonna fix it, it needs to be re-aligned and there is a special process for that if indeed the gun has been bumped outta alignment . I usta repair a lot of color tv's that, even though the colors weren't off convergence, the magnets that shape the beams of the three guns can be off a little and give this "glow" effect . And, yes . . . a DC magnet is gonna mess it up more . In a pinch, fire up the wife's (or your own macho-version) clothes iron and start moving it in circles as you move close to the center of the screen . . . do not stop moving in circles . . but then continue making larger and larger circles as you get to the outer diameter of the monitor case . . . . then just walk away and turn off the iron . It's not the heat . . but the A/C magnetic waves that will deperm the screen . If nothing changed, you are probable gonna have to get a signal generator ( . tequipment . net/ElencoSG-300 . html" target="_blank">www . tequipment . net) to align the guns . You will need a convergence/raster generator ( . gibsonteched . com/esg300 . html" target="_blank">www . gibsonteched . com) and the color bar generator . . gads . . this is so olde school stuff! I have never . . ever never seen the earth's gravity or sun magnetic fields cause this problem . What you probably have is the after effect of a shock or hard drop to the chassis that moved one of the magnets or broke the clamp for the magnet(s) that direct the green gun . Going a step further here, sunspots . . . if they actually melt the shingles on your roof might cause this problem, . . but then again if that happened, you'd not be worried about it anyway . And another step further than that: if there's an E . L . F antenna under your house, your monitor can get this green glow . . . and come to think of it, so will you! |
SurferJoe46 (51) | ||
| 395916 | 2005-10-15 04:22:00 | The purpose of the CRT's internal degauss is to overcome the earths magnetic field effects surferjoe. In Rotorua here, the thermal activity produces Hydrogen Sulphide, which corrodes silver and copper really fast. One of the problems caused by this, is that it causes tracking on the TV's PTC , which fails.(they utilise silver) Next thing the colour discolourations occur just from the earths field. As Billy say's, if a ultamately a deguass wand doesn't fix it, then it will be the shadow mask.Sometimes you can correct mask distortions with very small fixed magnets that are strategically placed, but it sounds just like a degauss is needed. |
pheonix (36) | ||
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