Products > Test Equipment
Fluke 189 ghosting LCD
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Fungus:

--- Quote from: Excavatoree on April 27, 2023, 06:56:32 pm ---I read someone, possibly on this forum, I can't remember, who said to NOT use isopropyl alcohol on these strips.  This person asserted that the alcohol absorbed moisture from the air, and that moisture would damage the connector and or the contacts.   

--- End quote ---

How much "moisture" do think the strips would absorb in 2-3 seconds of cleaning compared to, say, 20 years of exposure to air?
Fungus:

--- Quote from: andyB2022 on April 27, 2023, 03:39:18 pm ---Tried that already. The PCB is very clean. I've seen someone on YouTube using silver conductive grease. I haven't touched the zebra with IPA as I'm afraid of burning it.


--- End quote ---

Pull the strips out of that holder, clean both sides with IPA, flip them around, put them back.
andyB2022:
The strips on the LCD side are stuck on it, and I'm afraid of damaging them while pealing them off. Do you guys recommend me to clean the glass on the LCD too? Where the strips make contact?

As you see here (not my picture), the strips leave some residue on the LCD, but that residue means less material on the strip itself and a loss of material (higher pressure needed for the strips). It's just my theory. The whole idea is not to create a worse contrast on the LCD. Thank you!
giosif:
I share your concern, as I usually do the same (i.e. worry of making things worse).
However, what I've learned with help from people here on the forum is that, sometimes, you just need to take the risk.
As they say "no risk, no reward".
Also, for me, not taking risks can impede my learning.
Just food for thought...
And good luck, in case you decide to go ahead with the cleaning.  :)
Excavatoree:

--- Quote from: andyB2022 on April 28, 2023, 06:47:23 am ---The strips on the LCD side are stuck on it, and I'm afraid of damaging them while pealing them off. Do you guys recommend me to clean the glass on the LCD too? Where the strips make contact?

As you see here (not my picture), the strips leave some residue on the LCD, but that residue means less material on the strip itself and a loss of material (higher pressure needed for the strips). It's just my theory. The whole idea is not to create a worse contrast on the LCD. Thank you!


--- End quote ---

I forgot to mention that for almost every Fluke meter I've seen, I've never peeled the elastomeric connector from an LCD.  I just leave it "attached" and clean the PCB and the other side.   Maybe once in about 100 or so meters have I had to peel one off to replace the connectors when that didn't work.   I've never seen any other model have the problem shown in the photo, EXCEPT the model 10,11 and 12 (and similar variants)  The contacts on those LCDs are VERY fragile.   I've cleaned the LCD contacts on other meters with no problem (but I don't recommend it, this was a meter with another ghosting problem that never went away, even with a new LCD and connectors)  but I've damaged a model 10 LCD contact by looking at at it crosswise.
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