If the transceiver doesn't start at all, even with a fully charged battery, than most probably the fuse is blown up. In this chase just change it. This is a so called Picofuse 2.5 [A]. They can be found at Conrad under reference number 529754
It's easy to change, because it's externally accessible. You just need a spare fuse and a small soldering iron.
If changing the fuse doesn't solve the problem, and the next fuse does blow up immediatgely when the rig is powered on, than probably there is something wrong inside the transceiver. To open the transceiver you need a Torx screw-driver T8 Unscrew as well the whole module inside and have a look at the side of it, where the big electrolytic capacitor is placed. The capacitor's positive lead may touch the quartz situated on the above PCB. Change the shape of the lead, in order to create a gap between the two components.
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