Author Topic: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?  (Read 12168 times)

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Offline Kiriakos-GR

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I found on Ebay the offer of a replacement screen about those Scopemeter for 135$, and the new question will be:  do they get damaged ?  and how easy is to happen ?

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=230416504476&viewitem=&sspagename=ADME%3AB%3AWNAFP%3AMOTORS%3A1123


 

Online kaz911

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #1 on: November 23, 2011, 03:48:56 am »
seems like quite a few of the 12x and 19x series B&W displays have the problem. I think the repair guys resets (rework) the sockets/connectors. But only if it is horizontal lines. Vertical lines require new screen. Other "normal" problems with the 19x series seem to be "dead channel A" or "dead channel B"

I have followed quite a few talks on Fluke.com and other places since I considered a Scopemeter for a while.
 

Offline Monittosan

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #2 on: November 05, 2014, 06:06:33 pm »
you can rework the LCD ribbon cable with a soldering iron on its lowest temp setting.
The challenge is getting to the vertical ribbon cable as its behind the glass :(



 

Offline all_repair

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #3 on: November 05, 2014, 08:09:09 pm »
Be careful.  Do not use strong solution.  The ribbon is glued to the display and WD40 will sure dissolve them.  Reheating may help with some pressure, but I have not tried them myself.
 

Offline Monittosan

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #4 on: November 12, 2014, 02:44:37 am »
Well I was able to fix it!

The trick is creating a tip for your soldering iron to re bond the ribbon cable. I made a longer tip out of copper wire from coax cable to get under the glass and head up the ribbon on the board. Temperature of the copper tip was about 100 degrees centigrade and in the beginning you will make more lines appear before fixing any. If you still have faint lines appearing you need more heat





before



During repair
Notice the faint lines.


After


 

Offline miguelvp

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #5 on: November 12, 2014, 01:03:17 pm »
Good job,

Did you use the scope in sub zero temperatures btw? I've seen that LCD dead pixel pattern before :)
 

Offline Monittosan

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #6 on: November 13, 2014, 11:13:28 pm »
I've purchased it second hand from the US. Originally I thought that yellowing was a blemish or something that was rubbed onto the screen?
So the LCD fails in extremely cold conditions? makes sense as to why the screen had so many lines as well! (about 18lines :S )

Is there anyway to restore those pixels?   :-/O
 

Offline dexters_lab

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #7 on: November 14, 2014, 02:11:47 am »
interesting, i have a kurzweil synth keyboard with a similar issue with the LCD, i might try that technique!
"A common mistake people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools." - Douglas Adams
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Offline Monittosan

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #8 on: November 14, 2014, 12:29:17 pm »
Post your findings!
 

Offline zoiasso

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #9 on: March 06, 2019, 09:34:56 am »
I bought here in Brazil a fluke 123 without display (for repair)

Searching for displays for fluke 123 i found this https://item.taobao.com/item.htm?spm=a1z10.5.w4002-2339678517.20.SZvF5r&id=38243727275&spm=a1z10.5.w4002-2339678517.20.SZvF5r

its a chinese lcd, its smaller than the original.

I bought it today 03/05/2019, when it arrive in the next month, i will try to make a video, maybe it helps some people.

On Brazil the price of the display "new" is 3.300 BRL (1k dolar~). I paid 150 BRL (less than 50 dollar) for the fluke 123 for repair, just to clearify why i did that.
 

Offline zoiasso

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Re: Repair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?
« Reply #10 on: March 16, 2019, 01:19:55 pm »
product out of stock =/
 


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