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Related

Fluke Scopemeter 123

raygen
raygen over 5 years ago

Hi All,image

 

Need some help with a faulty Fluke 123 Scopemeter if anyone has had the same issue the scopemeter has been in storage for 20 years it has not been used much in its life and only used on test bench. it was working fine about 10 years ago never had a problem, fluke want $195 just for a quote and then on top of that the repair cost new screen is about $575 US dollars according to fluke there is no serviceable parts then on top there is labour cost not much change from $1000.

 

First I went to turn it on and ok dead battery fine understand still the original 20 year old battery. I ordered some new nicad batteries from amazon and I built a new battery pack for it also recycled the internal resistor and thermistor from the old pack. Battery seems to charge ok and so the battery part is fixed.

 

Problem I have is with the LCD screen I know there is a few YouTube videos around, about the connection between the LCD and the board issues black lines appearing but this seems to be a different issue the backlight is working ok but nothing on screen it’s all black.

 

I can see by plugging in the serial cable to pc the unit is sort of working if I view on the computer screen  using fluke view and I can scroll through the menu I can see the grid.

I have factory reset I was able to hear the 2 beeps the unit I had still no success

I applied some pressure near the ribbon cables with no success.

 

While I was successful scrolling through the menus viewing from a PC I thought I would try some simple tasks.

The continuity was acting strange the beep was going on and off and on random when I touch the probes

I could not get a reading from the probe measuring DC voltage.

I turned on the unit by disconnecting the battery and running it on just the power supply I believe this also loads the loader program no change so far not successful

I’m thinking it is a failed component due to age driving the display data or the LCD screen.

If a LCD is not used for a long period of time do they fail.

Checked the following test points

 

MS406 +5VA for +5V ok

MS405 +3V3D for +3.3V ok

MS401 -30VD for -30V (from Fly Back Converter). ok

MS404 REFPWM1 for +3.3V. ok

MS422: LCDONOFF for +3.3V ok

 

I am looking for anyone that has experienced the same problem  and any suggestions what could be the problem

 

Message was edited by: Raymond Genovese added photo

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  • Nakkl
    0 Nakkl over 1 year ago

    Hello Ray,

    just found your starting thread and wondering if you found a solution to the black display issue.

    Having exactly the same issue right now on a Fluke123 which had a broken battery months ago. Found corrosion on the battery connection which has been removed with flux remover only, but still same issue. Tried forcing more pressure to the display soldering itself which didn't change anything.

    BR

    Nakkl

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  • aspork42
    0 aspork42 over 1 year ago

    Hello,

    I repaired I believe a Fluke 190 with vertical stripes on the display. I had to clean the Zebra strip contacts on the rubber zebra strip. I think it also had a faulty battery. I think I did a write up here. Can you post a picture of the symptom?

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  • aspork42
    0 aspork42 over 1 year ago in reply to aspork42

     Fluke 190 Scopemeter repairhere we go. Is your issue similar?

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  • Nakkl
    0 Nakkl over 1 year ago in reply to aspork42

    That's what I have right now. Seems powering up with backlight but LCD stays fully black.imageimage

    Would remove the corroded battery connector next to see what's going on underneath. But if someone had the same issue I would appreciate.

    image

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  • shabaz
    0 shabaz over 1 year ago in reply to Nakkl

    Not sure the '123 is a very usable instrument in 2024. The specs are really bad (25Msps! And 500 points capture). Might be better to get any portable 'scope as an alternative.

    If you don't need the portability, then there are USB scopes too. Lots of options under $100 (plus, eBay scopes are about $1 per MHz it seems).

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