EEVblog 1425 - Fluke Repair 2 Electric Boogaloo

[EEVblog]

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:

[Kleinstein]

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.

[rsjsouza]

EEVBlog #84 is one of my favourites!   

[robert.rozee]

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   :-)

[rsjsouza]

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.

[coppercone2]

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