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ISO: Display for a Uniden Pro 640e

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  #9  
Old 05-28-2008, 03:34 PM
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Quote:
Originally Posted by ExitThirteen View Post
Unfortunately, you can't replace just the channel readouts on a Uniden Pro 640e, as the channel readout and the meter readout are all in one sealed unit (see my picture in my first post). If I could have replaced just the channel readout only, I would have fixed it a long time ago.

Thanks for the post and your willingness to help though, Dodgem!


I am perfectly aware of that.
I have 5-6 of the display modules, 3 from parted wrecks and 2 brand new.
I have replaced the OEM digit display with colored displays in those units.
No, you can not use a standard digit display to change the color.

I know all too well what's in these radios, they are like the Cobra NW junk, they prone to die in no time at all and to have the unit repaired... well, just go buy a radio with some age on it. In all honesty, it's pain and not worth the effort, the pre-line parts are the fault, not the display module. Go back and trace for a Cap. before the lead to the display module.

Thanks Again,
Dodgem

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  #10  
Old 03-04-2009, 04:14 AM
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Quote:
Originally Posted by ExitThirteen View Post
Unfortunately, you can't replace just the channel readouts on a Uniden Pro 640e, as the channel readout and the meter readout are all in one sealed unit (see my picture in my first post). If I could have replaced just the channel readout only, I would have fixed it a long time ago.

Thanks for the post and your willingness to help though, Dodgem!

I know I'm late on this but it might be of some help to all those who have bad displays on these rigs.....

I've done this twice with no problems, first you must remove the display, the whole thing, sig meter and all.....

Next saw, yes use a hack saw, the double seven segment part of the display free of the signal meter....

Even though the meter and the channel display is made in one casting they really are separate!

Now that the signal meter is all alone, You can solder it back to the face PC board....

Obtain a replacement channel display and I believe it to be a common cathode. Now here is the fun part!

I used salvaged displays from UPS boards. You can buy new ones but the original display is larger than the normal displays on most CBs.....

You will need to figure out the connections from the main board to the display that will light up the segments, draw this out on a plan sheet. This can be done before you remove the faulty display.....

Hard wire the new display to the main board connections and the wires must be long enough to go over the front board and allow the new display to function properly....

This is the basics for this mod but it works! As far as a service charge? Well you can do this in about two or three hours but it is more of a love for the radio and to keep it running.....

The S / RF meter will still work fine and behind the smoke plastic, the mod looks factory!

Good luck on this and take your time, it works!

mechanic

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  #11  
Old 07-09-2009, 08:33 AM
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Hello.
In Poland we fix burned displays that way:
http://obrazki.elektroda.net/81_1212335956.jpg
http://obrazki.elektroda.net/73_1215629651.jpg

SMD led diodes 0805 size.
Works perfect.
Mike
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  #12  
Old 07-09-2009, 01:24 PM
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how about that ! if there's a will , there's a way . Don't think I would go through all that , but it's like you said , if you have that much love and care for a perticular radio ? Why not. Could make a tech a nice chunk of change if given radio meant that much to the customer.

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  #13  
Old 03-15-2010, 04:30 AM
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Unhappy UNIDEN PRO 640E DISPLAY

I have attempted the disassembly procedure and repair mentioned by the gentleman in Poland. Unfortunately, Uniden in its wisdom apparently decided to encapsulate the front of the board in potting compound [later or older model than discussed in his response?]. I guess I'm stuck with trying to place an led display outboard on the surface of the old display. Does anyone have a wiring diagram or know which of the pins is common for the channel display? Also need to know what voltage is expected to the leds. I can't seem to figure out which is which. Thanks.

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  #14  
Old 03-15-2010, 09:25 AM
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This should help.
Mike
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File Type: jpg 1.jpg (33.1 KB, 17 views)
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Old 03-07-2011, 12:46 AM
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Any alignment links for this radio?
Cannot find a thing . . .

Is it the same as the 122XL?
And if so; is there an alignment link for that one?
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Last edited by Robb; 03-07-2011 at 02:36 AM.

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  #16  
Old 03-07-2011, 02:03 AM
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While searching for a alignment and display replacement - I found this...

Uniden Pro 640e AM / SSB CB Radio Review (December 26, 2009) - Now letís talk about the display Ė probably the single biggest reason not to buy one of these radios. The Uniden Pro 640e suffered from a major design flaw in the circuit that regulates the voltages to the channel LED segments and they are prone to burning out. When I say ďproneĒ I should say that if you own one of these radios, eventually the LED's will burn out. Replacing them in this radio is much more difficult than many other CBís on the market, and although possible, itís a pain. As you can see in the pictures of this radio the LEDís have burned out in multiple locations and although I can still tell what channel Iím on, if another 1 or 2 burn out it could get pretty interesting. Of course you can easily solve this by hardwiring in a frequency counter or using an external frequency counter.
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