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Old 10-01-2014, 07:50 PM
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Fluke 77/BN Multimeter

I have a Fluke 77/BN Multimeter, it's in good overall condition but has now a deteriorating LCD display, the background "foil" crumbles, it kind of warps and I can not see the readings clearly anymore. Is there a way to replace the LCD only and if, is this something I can order and do myself?
Thanks
Old 10-01-2014, 07:54 PM
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Unlikely.
Does the LCD have any unusual annunciators on it? If so, it's a Fluke-only part, and good luck finding a replacement. If you can find a replacement LCD, swapping it out is probably a simple matter of releasing the old one from it's frame, and installing the new one.
Old 10-01-2014, 08:05 PM
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This site says the part number of the LCD screen is 640581 (if the serial number is less than 80810247).

It's a obsolete part. Good luck finding one. And I'm afraid if you do find one, they'll want over $40 for it. You can buy a China-made elcheapo DMM for less than $40 that has more features and better ranges than your Fluke 77.

Or check eBay for a used Fluke 77.
Old 10-01-2014, 08:36 PM
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$25 on ebay
Old 10-01-2014, 09:47 PM
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Call Fluke. I was once told that all Fluke meters have a lifetime warranty.
Old 10-01-2014, 10:33 PM
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Quote:
Originally Posted by beowulff View Post
Unlikely.
Does the LCD have any unusual annunciators on it? If so, it's a Fluke-only part, and good luck finding a replacement. If you can find a replacement LCD, swapping it out is probably a simple matter of releasing the old one from it's frame, and installing the new one.
But LCDs are standard parts, and multi-meter LCD's are standard parts, so a chance you could find something compatible, even if some particular segments show something different.
Old 10-01-2014, 10:45 PM
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Quote:
Originally Posted by Melbourne View Post
But LCDs are standard parts, and multi-meter LCD's are standard parts, so a chance you could find something compatible, even if some particular segments show something different.
There are standard LCDs, but most meters use custom ones.
I've designed custom LCDs, and the ability to create one's own annunciators is very useful, so most meter manufacturers do so.
It's possible the 77 uses a standard LCD, but since i don't own one, I can't be sure.
Old 10-02-2014, 07:19 PM
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Thanks for the replys, I am the guy who want's to fix everything broken but as some have mentioned, that is more and more unlikely as the manufactures are reducing stocks of older parts...
Old 10-15-2014, 08:37 AM
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Nobody mentioned this fix that I will attempt to do on my Fluke 77/BN Multimeter, I will report back here if it did work later, I am busy right now.
http://exisle.net/mb/index.php?/...sumer-devices/
from this thread:http://boards.academicpursuits.us/sdmb/...d.php?t=737314
Old 10-15-2014, 10:06 AM
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Quote:
Originally Posted by Crafter_Man View Post
You can buy a China-made elcheapo DMM for less than $40 that has more features and better ranges than your Fluke 77.
While that's a fair suggestion, depending on the application the elcheapo route could get you hurt. Fluke products are geared toward industrial applications and have an excellent reputation. If you're working with hazardous voltage/current you want to know you can trust what's in your hands
Old 10-15-2014, 07:10 PM
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Quote:
Originally Posted by Obnoxious Hood Ornament View Post
While that's a fair suggestion, depending on the application the elcheapo route could get you hurt. Fluke products are geared toward industrial applications and have an excellent reputation. If you're working with hazardous voltage/current you want to know you can trust what's in your hands
Valid point; I should have also mentioned that you want to pay attention to the overvoltage withstand rating (Section 6 of IEC 1010) for any meter you buy. The Fluke 77 has a Category III rating when measuring between 600 V and 1000 V, and a Category IV rating when measuring less than 600 V. This is quite good, and it means the meter can be used for measuring voltage on industrial wiring (distribution panels, three-phase motors, etc.). For general purpose, around-the-house stuff (including home wiring), a Category II meter will suffice. I guess I wouldn't buy a meter that has a Category 1 rating, or no rating.

More info here and here.
Old 10-15-2014, 08:05 PM
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I have fixed a couple of Fluke 75s and 78s with fading displays.
Open the meter remove the battery and the display and take a new pencil eraser and gently clean the area where the LCD mounts. Reassemble and test.
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