WTB Fluke 25/27 screen - Page 1
Forum section: electronics / general

author: Specmaster
author_rank: Super Contributor
timestamp: February 02, 2018, 05:39:24 pm
content: Hi, has anyone (preferably in the UK) have a working LCD screen for a Fluke 27/27 at all please?I took mine out to clean the contacts as it was flickering slightly when on the resistance range and open circuit. I removed it and gently wiped the glass with Isopropyl and also the zebra strips. Now I have segments B & C not working on the 3rd digit. Swapped the zebra strips around and its the same so it looks like the screen itself has a dodgy connection.

author: KJDS
author_rank: Super Contributor
timestamp: February 02, 2018, 06:46:41 pm
content: I think I've got a pile of FLuke 25s in various states of disassembly. I'll have a rummage tomorrow to see what I can find.

author: Specmaster
author_rank: Super Contributor
timestamp: February 02, 2018, 07:03:00 pm
content: Thank you.

author: Shock
author_rank: Super Contributor
timestamp: February 03, 2018, 10:42:04 am
content: Clean it again and try the strip around the other way, have successfully done that on a few devices.

author: Specmaster
author_rank: Super Contributor
timestamp: February 03, 2018, 11:21:54 am
content: Yes, did that twice already but I'm going to try it again later today and I'll look at it with the microscope which might reveal something that the naked eye cant see.

author: tggzzz
author_rank: Super Contributor
timestamp: February 03, 2018, 11:34:48 am
content: Are the zebra strips being compressed sufficiently? Itmightbe possible to increase the compression by inserting a shim or washer in an appropriate place.

author: KJDS
author_rank: Super Contributor
timestamp: February 03, 2018, 04:41:00 pm
content: I've just had a rummage to see what I have. I suspect that all are faulty in some way or other and I don't have the time or inclination to test them. All are Fluke 25sEight units that are complete, though some of them have screws missing from the battery compartment. I've got a couple of transit cases for them. I also have four units without battery compartments and one that just has the front half of the case and the display board.Happy to take offers on any or all of these.

author: Specmaster
author_rank: Super Contributor
timestamp: February 03, 2018, 05:37:56 pm
content: Quote from: Shock on February 03, 2018, 10:42:04 amJust done that again and checked it under a microscope. There were a few small bits of fluff etc in parts of the strips right over the conducting parts, cleaned them, checking under the microscope, perfectly clean, checked the screen edge connectors (invisible to the scope) but clean, checked the display board pads, perfectly clean, reassembled and the problem is still there.

author: Specmaster
author_rank: Super Contributor
timestamp: February 05, 2018, 05:39:36 pm
content: Quote from: KJDS on February 03, 2018, 04:41:00 pmI've sent you a PM, did you get it at all?

author: Specmaster
author_rank: Super Contributor
timestamp: February 06, 2018, 03:01:19 pm
content: Quote from: tggzzz on February 03, 2018, 11:34:48 amYes, the zebra strips are being compressed enough, and I have taken them out and cleaned about 6 times now and the same with the screen. When I replace them back in the meter I have swapped the zebra strips, top one for the bottom one, and twisted them round so the left end becomes the right and also rotated them so the meter side becomes the PCB side, all with the same results. It must the screen contacts at fault or the screen itself, it did have a faint flicker before when in resistance range and open circuit the O/L slightly shimmied in the display.

author: Specmaster
author_rank: Super Contributor
timestamp: February 12, 2018, 04:49:47 pm
content: Thanks to KLDS, this particular problem is now resolved, once again, Kev, many thanks.

author: KJDS
author_rank: Super Contributor
timestamp: February 12, 2018, 06:21:40 pm
content: You're welcome, good luck with fixing the pile of them

author: julianhigginson
author_rank: Frequent Contributor
timestamp: February 12, 2018, 09:07:00 pm
content: So what was the fix, for people looking at this thread in the future?

author: Specmaster
author_rank: Super Contributor
timestamp: February 12, 2018, 09:17:53 pm
content: Exactly as the topic, a replacement LCD display, zebra strips were reused with the replacement display and worked like a charm so there must been some damage done to the display during cleaning, maybe I was just a little over zealous with the cotton but, who knows.

author: 0xsam
author_rank: Newbie
timestamp: July 17, 2020, 12:59:19 pm
content: Hey everyoneMy LCD on my Fluke 25 have had a nasty knock and sadly needs a replacement.Any chance someone can point me to where I can get hold of a replacement?Any information on other compatible part numbers / Fluke types (Fluke 27) would be appreciated

author: 0xsam
author_rank: Newbie
timestamp: July 27, 2020, 03:37:40 pm
content: Any help would be appreciated folks?