MacBook Pro intermittent recharging

Thank you, I tried but nothing changed

Mmm... I'm wondering if your display issues is more to do with the auto screen brightness function. In this series the iSight camera is also the photo sensor for the screen brightness control. See if turning is off from the keyboard function key alters things. If not you may want to clean the iSight camera connection on the logic board.

As far as the MagSafe charger alternating between Green & Amber only when you are running, but working as it should when shutdown or in sleep mode. I'm suspecting the battery is just showing its age, its getting close in needing replacement. It could be a cell or two are starting to breakdown which is the real source of both issues.

Yes Dan, I didn't explain correctly, the brightness issue m is due to the alternating charging / discharging issue and so, due to the "save energy" function which is activated.

I thought too that the battery would be the problem but I can't explain why the system tells me that its state is normal, maybe because it measures it by counting the cycles?

Changed the battery, the problem is still present. Any suggestion?

mmm ... By chance did you get your system wet at sometime? I'm starting to think you have some corrosion lingering on the logic board which has gotten moist with the higher humidity of the summer getting it to corrode some more, so its now causing this.