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An expert who has answered 20 questions.
Re: acer 4520 light going dim
Normally the way it works is if you plug in your AC Adapter to a laptop the computer screen will Brighten up since its no longer running off of battery and is actually charging . The reason why it should go dim is when you unplug the Ac adapter it goes dim to save battery life and last longer. If you are getting a really dim you can check and make sure that the Ac adapter jack on the adapter or motherboard isnt loose and it could be having contact to the unit and be loose inside and every small movement causes it not to charge / charge in and out and would cause this Dim effect. Again this depends on how old the computer is and I dont really think its the LCD or backlight going bad but you can try to mess with the screen brightness and If im not mistaken on that model it should be the FN key and the Right > and Left < Key for lower and higher brightness. Give that a try and check the adapter connection and you can pin point the issue . Hopefully it doesnt come worst to worst which could be a bad LCD going bad or damaged lcd internal cable. Hope my answer helped guide you closer to a solution.
Fn and f8 which is the arrow up button when it is plugged in will brighten the screen, press fn and f7 which is the arrow down button when unplugged to save power or fn and which ever keys have the sun face on it,it kind of looks like a star figure
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Try using the 'increase brightness' buttons (usually accessible using the fn key and a key with a 'sun' or 'lightbulb'-symbol) on your laptop while the A/C adapter is plugged in. Some laptops remember the brightness levels in each state (battery and plugged in), and go to that brightness level whenever they're plugged in/unplugged.
I spoke to Garmin Support about this issue. There are 2 settings for contrast on the nuvi 1300. You need to set the contrast while it is plugged into the vehicle, and also while it is unplugged from the vehicle. The reason for the 2 settings is to save the charge of the battery while it is not plugged into the vehicle or power source.
the dim on and off indicates
the ac power jack or adapter may be bad
its charging battery then not
take out the battery
check the pin in the laptop to see if it moves
or the end of the adapter could be bad
even if the green light is on
try not to wiggle to get to work, or you can break connection
there is a configuration of each one of the three plans of energy, and there you can change the time the screen is on when plugged or unplugged, the brightnes, and some stuff more like the wireless. you have to go to "energy option", or something like that... mine is in spanish. and then under each option is the configuration. good luck!!
It really sounds like you have a short in the ac adapter. Laptops dim the backlight on the screen when on battery power and go full brightness when on AC. I think your adapter is going on and off. When it is on the screen is on full and when it goes off the screen dims down a bit. You could have a bad adapter, most likely, or a bad charging jack in your laptop. Check the adapter first, just use a multimeter set to voltage. Read lead goes to the center pin and black lead goes to the outside metal contact, you should get a reading of 18 to about 26 volts. Move the wire around near the plug that you are holding and keep checking the readout. I think you will find the voltage dropping as you move the wire.
This is a possible problem with the inverter that powers the back lighting panel or it could be the power adapter connector on the latop.
Wriggle the power connector which plugs into the laptop, if the LCD screen flickers then the power connector is faulty or needs resolderng (repairing).
Does sound like a power issue. Assuming it's windows xp, you can check to see if it is a poiwer management setting:
Go to start, settings, control panel, display, and on the 'screen saver' tab at the bottom should be the "monitor power" area, click "power".
There is a power schemes area there. Check out what your settings are. Laptops often have settings for when plugged in versus when unplugged; when troubleshooting this make sure you are positive about if you are 'plugged in' or not as it will affect settings! :)
(On Vista go to Control Panel, Power Options; same thing, change your settings there)