I have a RottenDog DIS200 inside a Cyclone System 11. Some of the LCD segments have been problematic since I purchased the unit second-hand: some segments were not always lit, or lit when they should not be. None of the segments are burned out. I've lived with it because it was not too bad.

Today I replaced the AA batteries in the backbox. Now the display is much, much worse. Same problem, but now the display is sometimes impossible to read because of incorrect LCD segments light/unlit.

Any advice?
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Thanks for the reply! There is no leakage onto the boards from the batteries. They look clean. Is there any way to test this short of buying a new board? I would not want to buy a new board, replace it, only to still have the problem ... could it be the display, for example (or the board behind the display)?

I have checked the all connections are tight.

Here's a video of the test in auto mode -- is this at all helpful?

I reseated connections on the display board and also on the MPU. That fixed it. Thank you!