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IFR 1900 upside down display

This forum exists for the purposes for discussing service monitors (This includes but is not limited to Motorola, HP, Aeroflex, GD, etc). Additional topics allowed include test procedures, interpretation of test results, where to find information about specific tests, antenna VSWR, return loss testing, duplexer and filter alignment, etc.

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rgpace
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IFR 1900 upside down display

Postby rgpace » Tue Jun 23, 2020 3:29 pm

I have three IFR 1900s, one is working perfectly except for the LCD that is now upside down and inverted. Do I need a new LCD module, is there a fix for this? Thanks in advance. Ron

Jim202
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Re: IFR 1900 upside down display

Postby Jim202 » Wed Jun 24, 2020 5:07 am

Have you tried turning the 1900 upside down to be able to read the display?

rgpace
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Re: IFR 1900 upside down display

Postby rgpace » Wed Jun 24, 2020 5:35 am

Good one. Might be fun to try, but it is also inverted. I will need to turn it upside down and look at the reflection through a mirror.

jry
Posts: 434
Joined: Fri Feb 06, 2004 3:14 pm

Re: IFR 1900 upside down display

Postby jry » Wed Jun 24, 2020 6:23 am

usual fix is to tear apart the front panel and the TFT display to re-seat the internal connectors.

I usually verify with the display outside the unit first and RTV the connectors as a final step before complete re-assembly.

Same issue as the COM-120C ...uses same display.

you may want to consider upgrading to an LED back light while you have it torn down since the CFL's will eventually die.

rgpace
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Re: IFR 1900 upside down display

Postby rgpace » Wed Jun 24, 2020 6:35 am

Thanks, I opened the unit, re-seated all cables, and with everything apart, it worked properly! I did not RTV the connections however. So when I put everything back together, it went wacky again.

Jim202
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Joined: Sun Sep 09, 2001 4:00 pm

Re: IFR 1900 upside down display

Postby Jim202 » Thu Jun 25, 2020 10:15 am

Sounds like a poor connection someplace. Have you tried to re-seat the connectors a number of times to attempt to remove any oxidation that may have developed on the contacts? This is a common problem in some of the ribbon cable connectors and some wire connectors with crimped on pins.

Jim

rgpace
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Re: IFR 1900 upside down display

Postby rgpace » Thu Jun 25, 2020 10:31 am

Thanks Jim, I will give it a go and exercise the connections.

blitza
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Re: IFR 1900 upside down display

Postby blitza » Thu Jul 02, 2020 5:56 pm

Use a pencil eraser on the contacts

Jim202
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Joined: Sun Sep 09, 2001 4:00 pm

Re: IFR 1900 upside down display

Postby Jim202 » Sat Jul 04, 2020 4:07 am

Careful using the pencil eraser on the contacts as you can take the plating off. Use a gentile pressure doing this. It doesn't take much at all to clean the contacts this way.

Jim

jry
Posts: 434
Joined: Fri Feb 06, 2004 3:14 pm

Re: IFR 1900 upside down display

Postby jry » Sat Jul 04, 2020 4:53 am

make sue the eraser is new ...never been used and be careful.
usually clean the contacts with alcohol ( 99%) or contact cleaner

rgpace
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Joined: Tue Nov 10, 2015 11:52 am

Re: IFR 1900 upside down display

Postby rgpace » Sat Jul 04, 2020 7:17 am

Thank you for your help. I am back in business today. Really appreciate the help.


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