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

[Mike Schachter]

Thanks everyone! I'll bring it in Monday then, any help
towards figuring out what's wrong would be great!

  mike



On Sun, May 1, 2011 at 1:34 AM, Robert Belknap <rbelknap at gmail.com> wrote:

> 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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