Wiki

DAB radios ought to be very reliable as they have few mechanical parts, but nevertheless failures are not uncommon. Firstly, look for broken wires or connections and signs of poor workmanship such as bad solder joints. A faulty power supply is another possibility. Check whether the device works on batteries but not on mains. If it uses a separate power adapter, test its output voltage with a multimeter. If it runs directly off the mains then it will have an internal power supply. In this case, extreme caution must be observed if any tests are carried out with the device open. Only do so if you are completely confident that you can do so safely. Whether the unit runs on mains or batteries, it may well have internal circuitry to provide different voltages for the analogue and digital sections. You may be able to identify this and test it with a multimeter.