Tek LCD screen failure
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From: CC on 27 Oct 2007 20:47 James Sweet wrote: >>Thanks for your replies. >> >>When the scope is starting up, horizontal bars of varying display contrast >>flicker across the screen. After a few minutes, there are only occasional >>flickers, but the whole screen contrast is terrible. The white-on-grey >>soft menus that are displayed for instance by the "Quickmenu" button are >>barely visible. >> >>Overall backlight appears uniform, and the low-med-high levels appear to >>work correctly. >> >>I recall hearing years ago that folks had to pay about $1200 to fix a >>failed LCD. The reduced prices for LCDs obviously haven't percolated into >>Teks replacement parts. There is a lesser model of color Tek scope that I >>heard someone had to pay about $450 to fix. >> >>It is well past the warranty period. I think I bought it in 2001. Maybe I >>will consider extended warranty next time. But I will also give Agilent >>preferential consideration! >> > > > If it changes as it warms up, you might have a decent chance of tracking > down the problem with some freeze spray or a hair dryer. It was made right > around the time that the defective electrolytic capacitors made an > appearance, they would often start having problems when cold. Yeah, I'll try to check it out one of these weekends. I have little time, so fixing stuff isn't very appealing. I'd rather spend my couple hours a week learning, programming, or designing something new, and spend money to get commercial gadgets to keep working. -- _____________________ Christopher R. Carlen crobc(a)bogus-remove-me.sbcglobal.net SuSE 9.1 Linux 2.6.5
From: Nico Coesel on 28 Oct 2007 04:04 ChairmanOfTheBored <RUBored(a)crackasmile.org> wrote: >On Sat, 27 Oct 2007 23:37:56 GMT, "James Sweet" <jamessweet(a)hotmail.com> >wrote: > >> >>> >>> Thanks for your replies. >>> >>> When the scope is starting up, horizontal bars of varying display contrast >>> flicker across the screen. After a few minutes, there are only occasional >>> flickers, but the whole screen contrast is terrible. The white-on-grey >>> soft menus that are displayed for instance by the "Quickmenu" button are >>> barely visible. >>> >>> Overall backlight appears uniform, and the low-med-high levels appear to >>> work correctly. >>> >>> I recall hearing years ago that folks had to pay about $1200 to fix a >>> failed LCD. The reduced prices for LCDs obviously haven't percolated into >>> Teks replacement parts. There is a lesser model of color Tek scope that I >>> heard someone had to pay about $450 to fix. >>> >>> It is well past the warranty period. I think I bought it in 2001. Maybe I >>> will consider extended warranty next time. But I will also give Agilent >>> preferential consideration! >>> >> >> >>If it changes as it warms up, you might have a decent chance of tracking >>down the problem with some freeze spray or a hair dryer. It was made right >>around the time that the defective electrolytic capacitors made an >>appearance, they would often start having problems when cold. >> > > Except that it is more likely an interface issue than a component >issue, and the spray will likely exacerbate the problem. It could be a wiring / contact problem. I've spend many hours trying to get my Tek DAS9200 to boot properly and read 3.5" disks without errors. I even bought a replacement hard drive and floppy disk. In the end it turned out the ribbon cables went bad. A new SCSI cable and a new floppy cable solved the problems completely. -- Reply to nico(a)nctdevpuntnl (punt=.) Bedrijven en winkels vindt U op www.adresboekje.nl
From: John Devereux on 28 Oct 2007 07:54 CC <crobc(a)BOGUS.sbcglobal.net> writes: >> On Sat, 27 Oct 2007 20:58:21 GMT, "James Sweet" <jamessweet(a)hotmail.com> >> wrote: >> >>> "CC" <crobc(a)BOGUS.sbcglobal.net> wrote in message >>> news:fg08kt078f(a)news5.newsguy.com... >>>>Hi: >>>> >>>> It figures that with all the Tek TDS3000 series scopes I've been >>>> using at work for the past 8 years, that the TDS3014 I bought and >>>> paid for with my own money at home would have the LCD screen fail! >>>> [...] > > Thanks for your replies. > > When the scope is starting up, horizontal bars of varying display > contrast flicker across the screen. After a few minutes, there are > only occasional flickers, but the whole screen contrast is terrible. > The white-on-grey soft menus that are displayed for instance by the > "Quickmenu" button are barely visible. > > Overall backlight appears uniform, and the low-med-high levels appear > to work correctly. Hi Chris, I have a TDS3054 that had a badly flickering LCD, usually during startup or when knocked. It was just a bad connection of the LCD flex ribbon cable. Simply unplugging/replugging this cable fixed it. Make sure you download the service manual from their web site, it explains in great detail how to get the thing apart. (It would be impossible otherwise but is straightforward with instructions). -- John Devereux
From: Nico Coesel on 28 Oct 2007 08:37 ChairmanOfTheBored <RUBored(a)crackasmile.org> wrote: >On Sun, 28 Oct 2007 08:04:37 GMT, nico(a)puntnl.niks (Nico Coesel) wrote: > >>ChairmanOfTheBored <RUBored(a)crackasmile.org> wrote: >> >>>On Sat, 27 Oct 2007 23:37:56 GMT, "James Sweet" <jamessweet(a)hotmail.com> >>>wrote: >>> >>>> >>>>> >>>>> Thanks for your replies. >>>>> >>>>> When the scope is starting up, horizontal bars of varying display contrast >>>>> flicker across the screen. After a few minutes, there are only occasional >>>>> flickers, but the whole screen contrast is terrible. The white-on-grey >>>>> soft menus that are displayed for instance by the "Quickmenu" button are >>>>> barely visible. >>>>> >>>>> Overall backlight appears uniform, and the low-med-high levels appear to >>>>> work correctly. >>>>> >>>>> I recall hearing years ago that folks had to pay about $1200 to fix a >>>>> failed LCD. The reduced prices for LCDs obviously haven't percolated into >>>>> Teks replacement parts. There is a lesser model of color Tek scope that I >>>>> heard someone had to pay about $450 to fix. >>>>> >>>>> It is well past the warranty period. I think I bought it in 2001. Maybe I >>>>> will consider extended warranty next time. But I will also give Agilent >>>>> preferential consideration! >>>>> >>>> >>>> >>>>If it changes as it warms up, you might have a decent chance of tracking >>>>down the problem with some freeze spray or a hair dryer. It was made right >>>>around the time that the defective electrolytic capacitors made an >>>>appearance, they would often start having problems when cold. >>>> >>> >>> Except that it is more likely an interface issue than a component >>>issue, and the spray will likely exacerbate the problem. >> >>It could be a wiring / contact problem. I've spend many hours trying >>to get my Tek DAS9200 to boot properly and read 3.5" disks without >>errors. I even bought a replacement hard drive and floppy disk. In the >>end it turned out the ribbon cables went bad. A new SCSI cable and a >>new floppy cable solved the problems completely. > > > What part of the meaning of the word "interface" do you not understand? Probably somewhere between the 'i' and the 'e' :-) > Do you know how conductor elements are INTERFACED to an LCD panel? Interface seems a wrong word here. Attached would be better. Anyway, I fixed one of my own 19" panels. The wires coming from the TFT screen where torn off the TFT driver PCB because the previous owner dropped it. So I do know what a TFT screen looks like on the inside. -- Reply to nico(a)nctdevpuntnl (punt=.) Bedrijven en winkels vindt U op www.adresboekje.nl
From: CC on 28 Oct 2007 09:47
John Devereux wrote: > Hi Chris, > > I have a TDS3054 that had a badly flickering LCD, usually during > startup or when knocked. It was just a bad connection of the LCD flex > ribbon cable. Simply unplugging/replugging this cable fixed it. That's encouraging. > Make sure you download the service manual from their web site, it > explains in great detail how to get the thing apart. (It would be > impossible otherwise but is straightforward with instructions). That's funny. A lot of things are like this. Thanks for the reply. I'll give it a try. Good day! -- _____________________ Christopher R. Carlen crobc(a)bogus-remove-me.sbcglobal.net SuSE 9.1 Linux 2.6.5 |