Hi,
I knew there was something familiar about the original post and then the penny dropped. A while ago I had a similar problem with one of my chargers.
I disassembled the offending article and 'reflowed' the solder on the display board connector. If you're sure its the display and are competent with a soldering iron you could try the same. On my unit the display board was soldered to 0.1 inch pitch pillars, so it was fairly easy.
Not that I've been doing much flying lately, but my charger has behaved impeccably since then.
Chris