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My new data logger. LCD screen ghosting.

Sparkingchip
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You know electricians and others should probably not be allowed to bid on EBay late in the evenings without sleeping on their decision to bid. 


I saw a brand new data logger being sold by a stock  clearance firm with over a quarter of a million sales on EBay. 


Quite honestly they said it had been returned because the screen is ghosting,  I decided that so long as I can turn it on and set it up that reading the screen is not really important as the whole point of the data logger is to transfer information to a laptop to review events over a period. 


Do I bid for it and as no one else did I now have a data logger at a huge discount. 


I have took it apart and had a fiddle around with it, I have not made it any better, but more importantly I have not made it worse. 


I spoke to another forum member on the phone a couple of days ago and expected a rebuke when I said the only stuff I had to hand to try and clean the contacts was a bottle of after shave and some cotton wool. 


Apparently all I should need to do is take it apart,  clean it and reassemble it with a bit more pressure on the conductive rubber mount the screen sits on.


Handy hints welcome, particularly as  to what to use to clean the contacts and the surface of the rubber as well as any pointers on how to best reassemble it.




Andy Betteridge
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    Would something like Holts electrical contact cleaner from a motor factor of the job?


    Andy Betteridge
  • 0

    Sparkingchip:

    Would something like Holts electrical contact cleaner from a motor factor of the job?


    Andy Betteridge 




    If the Holts stuff is kind to plastics it may be o.k. It says that it leaves no residue so probably evaporates away with any  oil or grease. Perhaps some Isopropanol (SHL Manufacturing Ltd.)  which pretty much evaporates away totally, or electro-mechanical contact cleaner as available from R.S. It might just need the multicore ribbon cable/plug physically pushing towards contacts a bit. The contacts are very unlikely to be dirty.

    https://uk.rs-online.com/web/p/contact-cleaners/9175914/


    Z.

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    It depends what it contains...

    Some electrical solvents attack plastic. Some attack rubber.  

    My two favorites are Isopropyl Alcohol (IPA)  that is NOT India Pale Ale!  And the other one I think is now banned...


    Beware of pcb degreaser, this is for bare pcbs. I found out to my cost!

    Generally contact cleaner is OK, but some have lubricants in, which you don't want.


    RS 757-7128 WD-40 400 ml Aerosol Contact Cleaner for Controls, Electrical Equipment, PCBs, Photocopiers, Precision Equipment, looks OK to me, but don't mix up with normal WD-40!

    Have a look on RS Components website. Besides selling they also have good data sheets.


    Mike will likely tell you of his choice.

    Clive
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    Or this can happen....

    https://www.youtube.com/watch?v=EEXihSheOZU




    Z.
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    Thinking about it I did have some of the WD40 cleaner, but I doubt it’s much use now if I find it.


    I can home with a selection of the WD products from an Elex show some years ago, I need to clear my garage out and see what I find.


    Andy Betteridge 


    I might not have to look too far my local wholesaler should have the Ambersil range


  • 0
    IPA cleaner or PCB cleaner?


    I leaning towards the IPA cleaner.

    Ambersil Cleaning Solvent IPA 31569.



    • Isopropyl alcohol electronic cleaning solution.

    • Ideal for cleaning, degreasing and defluxing delicate electronic assemblies.

    • Leaves no residue.

    • Suitable for use on disc drives, photocopier drums, printed circuit boards, optical equipment, precision instruments, lenses and more


    Andy Betteridge
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    IPA is best. Please look at this video about similar repairs to multimeters. The method is similar for all L.C.D. screens.

    https://www.youtube.com/watch?v=fYXIBtwId0A


    Z.
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    In the days of Tipex, one had to be careful of the "refil" solvent, trichloroethane. I one spilt a little and it welded my keyboard to my desk. ?


    Acetone is a pretty good solvent, but if you are in Columbia, you will struggle to find it 'cos it is the solvent of choice when extracting cocaine. ??


    If you can get it, (ethyl) ether is a pretty good cleaner, but AFAIK, doesn't dissolve many plastics (if any). ?
  • 0
    Your best option is pure IPA (Isopropyl Alcohol). We use it as a cleaner for fibre optic cables before splicing. In the good old days, the solvent of choice was Carbon Tetrachloride, but that is long since banned. 


    Regards,


    Alan.
  • 0
    I have set it up at home with the intention of seeing if it reveals anything of note after a week, not that I am expecting to any surprises.


    With the current lockdown it will probably be at least a couple of weeks before I can get any cleaner and I presume most of the good stuff can’t be posted.


    Andy Betteridge

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