Uniden Pro 640e AM / SSB CB Radio Review (December 26, 2009) - Now let’s talk about the display – 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 “prone” 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 CB’s on the market, and although possible, it’s a pain. As you can see in the pictures of this radio the LED’s have burned out in multiple locations and although I can still tell what channel I’m 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.