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Author Topic: MFJ-259B LCD Replacement  (Read 3669 times)
K5USF
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Posts: 83




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« on: October 16, 2012, 08:32:55 AM »

Hello,

The LCD has gone Tango Uniform.  Has anyone replaced this?  I heard it was soldered into the unit.

Thanks.  Jim
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KA4POL
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Posts: 2028




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« Reply #1 on: October 17, 2012, 07:22:53 AM »

I'd call MFJ for advice. Sometimes it is just a contact problem with those displays.
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K5USF
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Posts: 83




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« Reply #2 on: October 17, 2012, 07:46:29 AM »

Thanks. Could be.  I'll clarify.  The LCD powers up and displays, but a 40% area of the LCD has gone black.  As if your finger is pushing on the LCD.
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KA4POL
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Posts: 2028




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« Reply #3 on: October 17, 2012, 07:58:06 AM »

This is a clear case of gone bad. Sorry for you, but that happens sometimes when the LCD is not sealed well enough.
Unfortunately I do not know what type you need for replacement.
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K5USF
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Posts: 83




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« Reply #4 on: October 17, 2012, 08:18:43 AM »

I reckoned so.  MFJ sells a replacement for 19 bucks.  Guess I will just tear it apart and see if digikey/mouser sell a replacement - maybe less than MFJs replacement unit.  Thanks.  73s
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KA4POL
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Posts: 2028




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« Reply #5 on: October 17, 2012, 08:33:21 AM »

Are you sure about the cost? I located this: http://www.mfjenterprises.com/Product.php?productid=354-1602S for $ 8.64.
Hopefully it is not a business idea of theirs.
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K5USF
Member

Posts: 83




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« Reply #6 on: October 17, 2012, 08:52:33 AM »

Yes:

Message:

$19.84 plus $8.00 minimum s/h. send personal check or money order to: mfj part request, 300 industrial park road, starkville, ms 39759 or call the techline, 1-800-647-8324 or 1-662-323-0549 to order with a credit card. thanks for your business.


I like yours better!
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N4NYY
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Posts: 4799




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« Reply #7 on: October 17, 2012, 12:10:26 PM »

If this is bad, I would clip the old one out, then remove one leg at a time with a soldering iron and sucker. It would be easier than trying to remove it as one piece.
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K5USF
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Posts: 83




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« Reply #8 on: October 17, 2012, 12:31:24 PM »

Thanks for the tip.
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N4NYY
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Posts: 4799




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« Reply #9 on: October 17, 2012, 12:41:40 PM »

Thanks for the tip.

I remove ICs that way, too. Clip the legs, remove, and install new IC. One other tip is that sometimes, you have to re-solder a joint in order to unsolder it. Do not hold the iron on it very long, or you can lift a trace. 25 W should do it. Temp control style is better. Set for 650 degrees.

If you need a decent sucker, let me know and I can point one out. It is an indispensable tool. 
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K5USF
Member

Posts: 83




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« Reply #10 on: October 17, 2012, 12:46:28 PM »

Got it.  Thanks again!  Jim
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N4NYY
Member

Posts: 4799




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« Reply #11 on: October 17, 2012, 12:57:36 PM »

Here is the solder sucker that I use. This is static safe.

http://www.amazon.com/Edsyn-Deluxe-Soldapullt-DS017LS-Static-Safe/dp/B0019V5HRA

Braid works well, too.
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KC4MOP
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Posts: 743




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« Reply #12 on: October 20, 2012, 04:41:27 PM »

MFJ has a reasonable fee for repairs. It might be better to send it to them. Heck it's going into two months that I sent my MFJ260 to them. A call to them gets me an answer, "we'll put someone on it today"........two weeks ago.
The display is soldered in?
Kenwood had a neat way to do that with a pressure fitting conductive material that actually had the hundreds of connections imbedded inside.
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WB6DGN
Member

Posts: 619




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« Reply #13 on: October 26, 2012, 11:36:13 PM »

Quote
The display is soldered in?  Kenwood had a neat way to do that with a pressure fitting conductive material that actually had the hundreds of connections imbedded inside.

One common name for that is a "zebra strip".  There are also a couple of other names that I've "forgotten".  They're notoriously unreliable as 'K' and others have subsequently found out.  Especially for a portable instrument subject to vibration and shock.
I echo the previous poster about sending it back to MFJ despite the possible wait.  It is very easy to damage the new display with excessive heat or mishandling.  This is not a beginner or intermediate level repair.
Tom DGN
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