Author Topic: EEVblog 1425 - Fluke Repair 2 Electric Boogaloo  (Read 1408 times)

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Offline EEVblog

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EEVblog 1425 - Fluke Repair 2 Electric Boogaloo
« on: October 06, 2021, 11:00:40 am »
Part 2 of the Fluke 23 multimeter repair by digging into the bunker meter archives from episode #84
Experimenting with alfoil



Part 1:
High energy Multimeter destruction:
LCD Technology tutorial:

« Last Edit: October 06, 2021, 11:12:30 am by EEVblog »
 
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Online Kleinstein

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Re: EEVblog 1425 - Fluke Repair 2 Electric Boogaloo
« Reply #1 on: October 06, 2021, 12:04:25 pm »
Many LCDs have the polarization at a 45 deg angle. With a loose polarizer foil one can than easy change the contrast from black segments to white segments, just by flipping the foil upside down. Many cheap pocket calculators come with a loose polarizing foil.
 

Offline rsjsouza

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Re: EEVblog 1425 - Fluke Repair 2 Electric Boogaloo
« Reply #2 on: October 06, 2021, 02:04:30 pm »
EEVBlog #84 is one of my favourites!   :-DD
Vbe - vídeo blog eletrônico http://videos.vbeletronico.com

Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline robert.rozee

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Re: EEVblog 1425 - Fluke Repair 2 Electric Boogaloo
« Reply #3 on: October 07, 2021, 10:58:42 am »
as i recall, light reflected off a metal surface is to some degree polarized. dave may have had slightly better success with a piece of white paper rather than metal foil, it would be interesting to see the result. certainly, the 'outlined' effect in the video is odd.

i've found that a good source of (rather large) scraps of polarized film is from the front of a broken LCD monitor or TV.


cheers,
rob   :-)
 

Offline rsjsouza

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Re: EEVblog 1425 - Fluke Repair 2 Electric Boogaloo
« Reply #4 on: October 07, 2021, 11:16:19 am »
as i recall, light reflected off a metal surface is to some degree polarized. dave may have had slightly better success with a piece of white paper rather than metal foil, it would be interesting to see the result. certainly, the 'outlined' effect in the video is odd.
Since you mentioned, I now recall putting a piece of paper behind one of those table alarm clocks with see through LCDs. I recall that beige worked better than white, as it reduced the glare.
Vbe - vídeo blog eletrônico http://videos.vbeletronico.com

Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline coppercone2

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Re: EEVblog 1425 - Fluke Repair 2 Electric Boogaloo
« Reply #5 on: October 07, 2021, 09:49:58 pm »
I had a fluke thermocouple unit with the same brown plastic screen clamp thing.. which happened to disintegrate into around 30 pieces. I painstakingly glued it all back together but I guess something happened to the plastic, as it kept breaking in different places. Ended up throwing it into the trash. That mechanism they designed to clamp the screen down is a real piece of work, I hate it. I did not want to even try to replicate it on 3d printer. The one in that meter looks a little bit more beefy and easier to repair though, the one I had was super thin and shit
« Last Edit: October 07, 2021, 09:54:02 pm by coppercone2 »
 


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