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The screen flicker on and off and then fades out. It is not the battery. sometimes if you touch the laptop it just turns off.

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Lose connection near top of keyboard.............
cheers

Posted on Mar 27, 2011

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Could be one of three things:

1.) Failing inverter (which powers the screen up). Given what you describe, if it is the inverter, it may be that the connection is loose to the screen. The inverter converts the 20 volts or so from the laptop to a much higher voltage and relies on a tight fitting.

2.) Failing backlight (this is the light that illuminates the screen after getting a charge from the inverter.) Again, this can also be a loose fitting of the cable between the inverter, the connection to the motherboard and the 30pin connection to the back of the screen.

To test this, connect the laptop to an external monitor, if the monitor stays on, then the problem lies in the above (it may also be a faulty VGA cable between the screen and motherboard, but unlikely)

If it is the problem, you will need to get the inverter and screen tested.

After that, and if the problem occurs ONLY on AC power, I'd suspect that the charger might be throwing out intermittent voltage. Test this with a multimeter set to 20 volts at the DC jack end, with the red probe in the inner of the connector and the black probe in the outer of the connector.

Check also the tightness of the DC jack in the charging port

3.) More serious... the graphics chip may be overheating, this occurs when there is a build up of dust on teh cooling fan, If you have the model with the large plate underneatth the laptop , remove it and clean out the components.. try again and see if this fixes the problem.. if not, then you will need to get it stripped and cleaned by a competent technician (or take the time to do it yourself).

If none of the above work, then you have a failing garphics chip and will need to consider replacing the motherboard

Posted on Mar 27, 2011

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