[Noisebridge-discuss] how does one debug an lcd screen?

[Robert Belknap]

Oooh, count me in on that vacation thing!

Having recently done a monitor repair myself, (though I'm even less of an
expert than Zach...) what you're describing sounds like 1 or more bad
capacitors.  Looking at the third picture, I'd say that the cap on the top
right looks damaged. It's had to tell from the angle, but the bottom 2 on
the right in that same photo might need to go as well.  (They won't
necessarily look all exploded if they've failed.  If you see any kind of
bulging, that's a sign that the capacitor needs to be replaced.)

Oh yeah, and the CapXOn brand is the same as what I had to replace in my
ViewSonic.  If you want to make sure, (and want the soldering practice ;-)
(parenthetical smilies look weird) ) you could go ahead and replace them
all.  I sourced replacements for all but the big 400v one on my board from
mouser, and they ran me less than $10, iirc. (The big cap was expensive, and
mine looked okay - so I left it.)

Looks like the board has lots of room to work on, and your parts don't look
as covered in foam as mine were. :-)

-Robert


On Sat, Apr 30, 2011 at 19:33, Zach . <organic_unity at yahoo.com> wrote:

> vaction? where?  I wanna go :)
>
> thanks for the introduction brian.  Ive fixed a few LCDs at NB and while Im
> definitely not an expert at it I feel like I do have the hang of it and
> could probably point you in the right direction.  For starters, the cap in
> the far bottom left looks bad.
>
> Bring it by on Monday and I can probably take a look at it.  I might even
> be over there tonight.  I don't offer free repairs but I like to teach and
> impart what I've learned.  So if you want to learn how to fix I'd be glad to
> help.
> best,
> zach
>
> --- On *Sun, 5/1/11, Brian Morris <cymraegish at gmail.com>* wrote:
>
>
> From: Brian Morris <cymraegish at gmail.com>
> Subject: Re: [Noisebridge-discuss] how does one debug an lcd screen?
> To: noisebridge-discuss at lists.noisebridge.net
> Date: Sunday, May 1, 2011, 1:11 AM
>
>
> Zach is the monitor wizard who fixed a bunch of them recently.
> I think he is away on vacation, but you could ask him for help.
>
> Brian
>
>
> On Sat, Apr 30, 2011 at 2:49 PM, Mike Schachter <mike at mindmech.com<http://mc/compose?to=mike@mindmech.com>
> > wrote:
>
> I'm working under the assumption that the power supply
> is busted, so I took the thing apart and pulled out the
> board where the power plug goes. This is what it looks
> like:
>
> http://imgur.com/a/pbpea#2spwh
>
> I'm not quite sure how to proceed. There's a bunch of
> capacitors everywhere. To my inexperienced eye, nothing
> looks all that exploded... Should I just take a voltmeter
> and measure the resistance of each end of the capacitors?
>
> If one of the capacitors was messed up, would the resistance
> be infinite? I'm kind of at a loss because none of this involves
> probability distributions, calculus or computing derivatives. The
> board doesn't have any equations on it!?! Maybe I could bring
> it into circuit hacking Monday?
>
>  mike
>
>
> On Fri, Apr 29, 2011 at 8:53 PM, Mike Schachter <mike at mindmech.com<http://mc/compose?to=mike@mindmech.com>>
> wrote:
> > Hi there,
> >
> > So, I'm not the most knowledgeable person on earth when
> > it comes to electronics... I took an electronics class once,
> > and passed it...
> >
> > I have an LCD screen, a Westinghouse. Kind of like a TV
> > or something. From years ago. It failed on me - it sorta
> > powers on, but nothing shows up on the monitor.
> >
> > Sometimes the ON light just flashes, gradually fading softly
> > into the quiet night. It makes me kind of sad. Sometimes I
> > wonder if I can bury it in an LCD screen cemetery; would it
> > come back to life, only to eviscerate it's hapless owner? My
> > final screams should rightfully go unanswered, having toyed
> > with things that unknowing humans should not. I'd like to
> > avoid that. At least for now.
> >
> > So... does anyone know how to debug problems with LCD screens?
> >
> >  mike
> >
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