Flickering dash..different than threads I have read....

The car operates fine in the Ready mode. I have read several "flickering dash display" threads and my problem is different.
When I attempt to turn off the car by pressing the Power button, the car shuts off but the combo meter display, the yellow key fob icon and "engine maintenance" icon all remain lighted and flicker.
If left in this state, they remain on, flicker and just drain the 12V battery.
In the Ready mode, the fob key icon comes on and remains on despite a good fob battery, good fob function etc..
All agreed it was the combo meter. We replaced the combo meter and the same problem persists.
I have never used a Mini VCI and it has been suggested to try that next, perhaps that is the next step.
The headlights work in this altered, flickering state and clearly there is a drain on the battery when they are on, as would be expected.
The MFD, radio, clock etc all turn off OK, but not those combo meter panel lights and 2 yellow icons.. .
Depressing the power button with brake depressed puts it right back in "ready" mode again from this altered state. Without the brake depressed, the expected partial power up mode comes on OK.
It was intermittent, now persistent.
The 12V battery tests OK, 12V at rest and 14V while running per my volt meter.
NAPA did a test on the battery too and they said it was OK also.
In the past, disconnecting the battery for a while, if not overnight, seemed to resolve it. I have tried several maneuvers like ...many variations like
- shutting on and on several consecutive times (seemed to fix it once or twice).
- holding power button down for several seconds, with and without the brake pressed.
- shutting off Power while still in Drive, Reverse or Park.....
Please advise. Please ask questions.
For now, I am just disconnecting the battery when not in use.

 

bisco, Thanks for your reply. I forgot to mention it is a 2009 Prius. Your image looks like the dash, but I have no display that looks like that.
I am not familiar with reading trouble codes, I do not know how to do that. If it is by using the VCI, I don't have one yet and going to a Toyota dealer is not an option.
My 12 v battery is good.

 

bisco, The combo meter is new to me / refurbished. I am thinking it is something else because it is the exact same problem with a new combo-meter and, the 2 yellow icons flickering are not part of the combo meter.
Anyone hear of a Power button switch problem or some other short ?

bobodaclown, not sure what you mean by using a battery box jumper, but my digital meter reads 12.3-4 v and 13.8 - 14.2 v when running.

 

THIS IS THE DISPLAY THAT WILL NOT TURN OFF