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

Mike Schachter mike at mindmech.com
Wed May 4 07:18:02 UTC 2011


Hey thanks again to everyone who helped me
out on Monday. I replaced 3 bust-ass capacitors
with some scavenged from a motherboard, and
everything works now!

I even have a few screws left over from taking
apart the monitor! Definitely alot easier than I thought
it would be.

 mike



On Sun, May 1, 2011 at 11:14 AM, Mike Schachter <mike at mindmech.com> wrote:

> 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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>>
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