Just received my new cobra 29 lx cb. When I turn on the power the radio comes on for about 2 seconds then the screen goes blank and all fuctions cease. When the power to the radio is turned off, the screen illuminates for a moment before it off. What is wrong? I'm running the system off a pyramid reguilated power supply 10Amps also has fuse all fuses are good and operating. Antenna is connected.

jay I am not sure what you mean by the clock cutting out. I enclosed the manual in PDF form look at page 17 and see if this helps. If not ask the question with more detail.

https://www.cobra.com/sites/default/files/manuals/29%20LX.pdf

you may have burnt the diode that a variable controls or you messed with it and burnt it out.

one of the few radios that won't allow you to turn up. the most you will get is 4.5 watts . if you want power buy yourself a 250 watt liner amp and leave the radio where it is . turn VR 4 up for max modulation and go for it.

Audio Transmitter and diode is burnt out!

no it didn't fail. the radio is designed not to except any mods without bypassing something . If you don't know what to bypass then leave it alone and turn it back to where it was.

what else did you do to mess up this radio.

brand new out of the package don't need tuning. just turn up the power a bit to 3.8 - 4 watts and modulation set at 95% and you will be fine.

Try Cobra Directly here: Support Cobra Electronics Corporation

Fuse in the lighter adapter or the source was dead.

This is normal for the LXLE's. The new circuitry power the new face plate uses a small high voltage transformer and if power is applied to the receptacle on the radio it is drawing some current. When the power supply is turned off or on with the on/off switch on the LXLE turned off there is still a spike of current going through the radio. Not to worry, it will hurt nothing. If this is truly a problem, someone could probably design a little diode circuit to stop this issue. I would if I could but am not that smart.