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01-31-2010 08:07 PM - edited 01-31-2010 08:10 PM
Normally if you suddently switch from AC to battery mode, your display brightness will change to a lower setting to save the battery life.
If it happens when you are on AC Adapter and your battery is still inside the laptop, then it is likely the AC input was dropped out temporary and forced the notebook into a battery mode.
If it happens when you are on battery mode only, then it could be the problem with your battery, motherboard, LCD inverter or the LCD panel. In this scenario, you may want to keep track of the frequency of this failure and send the notebook back to HP with your failing records so that HP could debug this failure for you.
03-09-2011 07:45 AM
I have a similar problem with HP tx 2500 touch screen. My screen loses its brightness mometarily and this happens irregularly all the time as I use both the AC and the battery. However, when I start flipping or bending it down, the screen may ameliorate or keep doing the same.
I unscrewed the small section under the battery where it has the connection ports of the screen on the board. Nothing seemed unusual. I suspect the other main connection (the one on the board, under the keyboard, before the main rotatable shaft ). Any idea of what's going on?