basic TV question
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From: Tom Biasi on 4 Jun 2010 20:40 "default" <default(a)defaulter.net> wrote in message news:ht2j0658sslr81b2rpkd9ur52cjccd9a8r(a)4ax.com... > On Fri, 04 Jun 2010 12:22:17 -0700, John Larkin > <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Thu, 03 Jun 2010 20:16:52 -0400, default <default(a)defaulter.net> >>wrote: >> >>>Do all TV's have built in degaussing coils these days? >>> >>>I have a CRT style TV that's been in service for ~ 4 years and it has >>>been gradually losing "color purity" mostly on the bottom edges in a >>>circular pattern - center good. >>> >>>I can null out the green or magenta it favors and correct the color by >>>holding a piece of non-magnetized iron in just the right place in >>>front of the screen, one corner at a time, so I'm fairly sure it is a >>>problem with a magnetized chassis or color mask. >>> >>>I've never heard a 60 cycle buzz when the set fires up the way normal >>>degaussing circuits sound, but didn't think anything of it until the >>>purity started to go out. Could I have skated this long without a >>>problem with no built-in coil? And can they make them totally silent? >>> >>>Plan A is to whip up a manual degaussing coil. I have 5,000 feet of >>>24 AWG and figure 3,000 feet on a 14" diameter coil will have a >>>reasonable impedance and use ~60 watts. >>> >>>Plan B is to fix the set >> >>Do you have a soldering gun? They are good degaussers. >> >>John > > Thanks > > I do, and tried that. Winding a coil and connecting it in place of > the tip may be a winner. The gun alone, with a regular soldering tip, > tried in all orientations, did help - the side bands are almost gone > and the center (where I didn't think there was a problem) looks > better. > > But there are still two pesky areas on the bottom corners. If I > didn't know better, I'd be looking for a hidden magnet. > > > -- Just fix the TV.
From: George Herold on 4 Jun 2010 23:34 On Jun 4, 3:22 pm, John Larkin <jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: > On Thu, 03 Jun 2010 20:16:52 -0400, default <defa...(a)defaulter.net> > wrote: > > > > > > >Do all TV's have built in degaussing coils these days? > > >I have a CRT style TV that's been in service for ~ 4 years and it has > >been gradually losing "color purity" mostly on the bottom edges in a > >circular pattern - center good. > > >I can null out the green or magenta it favors and correct the color by > >holding a piece of non-magnetized iron in just the right place in > >front of the screen, one corner at a time, so I'm fairly sure it is a > >problem with a magnetized chassis or color mask. > > >I've never heard a 60 cycle buzz when the set fires up the way normal > >degaussing circuits sound, but didn't think anything of it until the > >purity started to go out. Could I have skated this long without a > >problem with no built-in coil? And can they make them totally silent? > > >Plan A is to whip up a manual degaussing coil. I have 5,000 feet of > >24 AWG and figure 3,000 feet on a 14" diameter coil will have a > >reasonable impedance and use ~60 watts. > > >Plan B is to fix the set > > Do you have a soldering gun? They are good degaussers. > > John- Hide quoted text - > > - Show quoted text - I never thought of that, I was cobbing something together the other day to demagnetize some tweezers. George H.
From: Tim Wescott on 5 Jun 2010 00:26 On 06/04/2010 04:34 PM, default wrote: > On Fri, 04 Jun 2010 12:22:17 -0700, John Larkin > <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >> On Thu, 03 Jun 2010 20:16:52 -0400, default<default(a)defaulter.net> >> wrote: >> >>> Do all TV's have built in degaussing coils these days? >>> >>> I have a CRT style TV that's been in service for ~ 4 years and it has >>> been gradually losing "color purity" mostly on the bottom edges in a >>> circular pattern - center good. >>> >>> I can null out the green or magenta it favors and correct the color by >>> holding a piece of non-magnetized iron in just the right place in >>> front of the screen, one corner at a time, so I'm fairly sure it is a >>> problem with a magnetized chassis or color mask. >>> >>> I've never heard a 60 cycle buzz when the set fires up the way normal >>> degaussing circuits sound, but didn't think anything of it until the >>> purity started to go out. Could I have skated this long without a >>> problem with no built-in coil? And can they make them totally silent? >>> >>> Plan A is to whip up a manual degaussing coil. I have 5,000 feet of >>> 24 AWG and figure 3,000 feet on a 14" diameter coil will have a >>> reasonable impedance and use ~60 watts. >>> >>> Plan B is to fix the set >> >> Do you have a soldering gun? They are good degaussers. >> >> John > > Thanks > > I do, and tried that. Winding a coil and connecting it in place of > the tip may be a winner. The gun alone, with a regular soldering tip, > tried in all orientations, did help - the side bands are almost gone > and the center (where I didn't think there was a problem) looks > better. > > But there are still two pesky areas on the bottom corners. If I > didn't know better, I'd be looking for a hidden magnet. > > Do you have kids? "Hidden magnet" just made me think of that for some reason. Just fix the dang thing. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
From: Bob Masta on 5 Jun 2010 08:19 On Fri, 04 Jun 2010 19:34:27 -0400, default <default(a)defaulter.net> wrote: > >But there are still two pesky areas on the bottom corners. If I >didn't know better, I'd be looking for a hidden magnet. Hmm, could they be due to the speakers in the set itself, or a nearby stereo? Best regards, Bob Masta DAQARTA v5.10 Data AcQuisition And Real-Time Analysis www.daqarta.com Scope, Spectrum, Spectrogram, Sound Level Meter Frequency Counter, FREE Signal Generator Pitch Track, Pitch-to-MIDI DaqMusic - FREE MUSIC, Forever! (Some assembly required) Science (and fun!) with your sound card!
From: default on 5 Jun 2010 08:32
On Fri, 4 Jun 2010 20:40:52 -0400, "Tom Biasi" <tombiasi(a)optonline.net> wrote: > >"default" <default(a)defaulter.net> wrote in message >news:ht2j0658sslr81b2rpkd9ur52cjccd9a8r(a)4ax.com... >> On Fri, 04 Jun 2010 12:22:17 -0700, John Larkin >> <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Thu, 03 Jun 2010 20:16:52 -0400, default <default(a)defaulter.net> >>>wrote: >>> >>>>Do all TV's have built in degaussing coils these days? >>>> >>>>I have a CRT style TV that's been in service for ~ 4 years and it has >>>>been gradually losing "color purity" mostly on the bottom edges in a >>>>circular pattern - center good. >>>> >>>>I can null out the green or magenta it favors and correct the color by >>>>holding a piece of non-magnetized iron in just the right place in >>>>front of the screen, one corner at a time, so I'm fairly sure it is a >>>>problem with a magnetized chassis or color mask. >>>> >>>>I've never heard a 60 cycle buzz when the set fires up the way normal >>>>degaussing circuits sound, but didn't think anything of it until the >>>>purity started to go out. Could I have skated this long without a >>>>problem with no built-in coil? And can they make them totally silent? >>>> >>>>Plan A is to whip up a manual degaussing coil. I have 5,000 feet of >>>>24 AWG and figure 3,000 feet on a 14" diameter coil will have a >>>>reasonable impedance and use ~60 watts. >>>> >>>>Plan B is to fix the set >>> >>>Do you have a soldering gun? They are good degaussers. >>> >>>John >> >> Thanks >> >> I do, and tried that. Winding a coil and connecting it in place of >> the tip may be a winner. The gun alone, with a regular soldering tip, >> tried in all orientations, did help - the side bands are almost gone >> and the center (where I didn't think there was a problem) looks >> better. >> >> But there are still two pesky areas on the bottom corners. If I >> didn't know better, I'd be looking for a hidden magnet. >> >> >> -- > >Just fix the TV. > > Now where's the fun in that? It is a big beast and I don't want to move it. Calculating the inductance for a degausser is more rewarding than poking about in TVs. -- |