LCD Desktop Monitor Fading to White, then Black
in [Repair]
|
Prev: PSU eval. # n3252w View Sonic, Model vs11335-1m
Next: instructor solution manual for Reinforced Concrete: Mechanics and Design (5th Ed., James G. MacGregor & James K. Wight)
From: Jeff Liebermann on 7 May 2010 01:54 On Thu, 06 May 2010 21:25:00 -0700, Jeff Liebermann <jeffl(a)cruzio.com> wrote: >I just tried to fix a Samsung Syncmaster 192N monitor. I replaced 6 >assorted CapXon electrolytics but the monitor doesn't work. My ESR >meter is at home so I'll drag the pile home and report on the measured >ESR values. Hmmm... Weird and not according to my guesswork, as usual. Value Max ESR Measured ESR 1000uF 25v 0.10 0.08 1000uF 25v 0.10 0.07 1000uF 10v 0.10 0.12 1000uF 10v 0.10 0.08 330uF 25v 0.30 0.10 330uF 25v 0.30 0.10 Max ESR from this chart: <http://members.ozemail.com.au/~bobpar/2003esrchart.txt> Out of 6 caps removed and tested, only one of them is somewhat bad. No wonder replacing the caps didn't fix the monitor. Something else is wrong. So much for the easy fix. -- Jeff Liebermann jeffl(a)cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
From: Dav.p. on 7 May 2010 21:06 Hi, i'm new here and sorry 4 my poor english, first of all this long flame seems to me much out of site (? exagerate..?), too much word maybe for a very simple problem, i'm not a tech but from the first agree with talks of J.Liebermann, the strange thing i spect from somone that suspected the main 5v line that ususally supply the graphic/video chip, so is not (for me) a bad idea to test the 5v line on the psu connector to the v.board since you don't found any bulged/ dirt capacitor, and if you find the v changes according to the fades then go to order caps, if not try at least to measure on the regulator on v.board to see if exit 3,3v fixed or some like it. I don't agree to what said, it's a luck that you have 2 equal monitor so in the last if you don't find culprit you can swap boards and see bye bye.
From: Dav.p. on 7 May 2010 21:11 > but from the first agree with talks of J.Liebermann, the strange thing i spect from somone that sorry, i espected... i've made a jam.. the strange thing was: nobody has told to test 5v line.. > suspected the main 5v line that ususally supply the graphic/video chip, so is not (for me) a bad > idea to test the 5v line on the psu connector to the v.board since you don't found any bulged/
From: saber850 on 9 May 2010 11:12 On May 7, 9:06 pm, "Dav.p." <davi...(a)tiscali.it> wrote: > Hi, i'm new here and sorry 4 my poor english, first of all this long flame seems to me much > out of site (? exagerate..?), too much word maybe for a very simple problem, i'm not a tech > but from the first agree with talks of J.Liebermann, the strange thing i spect from somone that > suspected the main 5v line that ususally supply the graphic/video chip, so is not (for me) a bad > idea to test the 5v line on the psu connector to the v.board since you don't found any bulged/ > dirt capacitor, and if you find the v changes according to the fades then go to order caps, if not > try at least to measure on the regulator on v.board to see if exit 3,3v fixed or some like it. > I don't agree to what said, it's a luck that you have 2 equal monitor so in the last if you don't > find culprit you can swap boards and see > > bye bye. Yes, I've been considering swapping one of the boards between the monitors. This seems like the easiest way to narrow down the problem.
From: Dav.p. on 9 May 2010 13:40
is also the last way, control first out voltages, if bad change caps |