These problems can be the result of a bad chip (integrated circuit) on the display board or controller or a simple loose connection. Loose connections happen mostly in mobile applications due to vibrations, bumps, etc. Almost everything can be repaired - but often it is simply not worth the expense. You may be able to make a repair to a loose connection on your own if you have some soldering skills."Before" shows a small crack around the post. The component on the other side was disturbed before the solder at the bottom cooled completely, resulting in a cold solder joint. Adding a small amount of solder repairs the joint to "After".
The first thing to do is determine if there is a loose connection or "cold solder" joint as shown above. Only attempt this if the radio is a mobile radio - or otherwise powered with less than 30 volts or so. Base radios (connected to your home's AC mains) should be brought in for professional service instead. First, check for a loose connection while powered up by attempting to slightly move the display. Apply pressure to the top, bottom, left and then right side. Watch closely for an indication of the bottom segments of the LCD turning on. Next, open your radio to access the display PCB. Duplicate the movement if it turned on the display, again. Look at the areas that connect the display PCB to other parts with solder. Try to find the places that expose a crack while moving the display. If none are found, look for the location(s) that are stressed when the display is manipulated. If the display is not turning on at all, look for cracks on the PCB associated with the display. You may need to try to get some movement of this PCB(s) to get the display to flicker on and off. It is very important to keep fingers and tools away from the small coils of wire on the PCB(s). The slightest deflection of the coil can cause major problems
for the radio and the operator if it transmits out of the intended band. If you can not get the display to flicker on and off, there is probably a component that has failed. This will require pro service to locate and correct. Likewise, if you are unable to determine the soldered point(s) that when moved, cause the display to flicker, or are uncomfortable soldering small parts, etc. you should bring the radio in for pro service.
If you decide to attempt a repair, a small, 15 to 30 watt iron is maximum size to be used. Gently heat the suspect solder joint(s) to restore the connectivity to the display PCB. If you located a cracked PCB, the silver "traces" on both sides of the crack will need to be joined. Sometimes, a small blurb of solder can bridge the crack, other times a length of wire is needed to do the job. Use only as much heat is required to melt the solder. Too much heat will damage the PCB and / or components on the PCB. When done, carefully inspect your work. Look for accidentally "bridged" connections, as shown in the red circle in the image below:
You may need to solder wick or solder vacuum bulb to clear these bridges. Check your work twice and reassemble to test.
I hope this helps and good luck! Please rate my reply. Thanks.