Question about Dell Inspiron 1720 17" Widescreen Notebook, 2.0GHz INTEL CORE 2 DUO, WiFi, 2GB RAM, 500GB, CDRW/DVDR... (883585945740)

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Screen goes dim when using ac adapter, is normal on battery

It is dim only when using ac adapter. Just purchased a new adapter and still the same problem

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  • 269 Answers

Depending on operating system..
go to power management and find screen brightness..
It's separate for battery and AC

Posted on Aug 18, 2015

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Posted on Jan 02, 2017

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SOURCE: Dell Inspiron E1705, Faint Black Screen on Battery Power

the first thing i would do is do a bios update for the machine whilst using AC power, that may well iron the problem out, if not then there is a problem with the laptop itself i.e. a power drain, sizzling and popping noises is not good at all and could damage the machine further, remove the battery and check the connections on the laptop, dust and hair conduct electricity, it could be as simple as that, it is also a known fact that some lithium batteries are faulty and have been known to blow up whilst in use.
Go to the laptops support website to find out if they have been having problems with batteries and if there any returns proceedures

best regards

Posted on Nov 17, 2008

  • 114 Answers

SOURCE: Replacement adapter will not charge battery

Did the old one do the same thing? If true, your battery sounds like it is dead.

Posted on Jan 17, 2009

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SOURCE: New Dell battery, new AC adapter(not Dell). Won't charge battery

Dell uses a proprietary SMBus protocol over the center pin to communicate the type and power capability of the attached adapter. The laptop uses this information to determine if it can charge the battery without browning out the motherboard. If you use a knock-off power supply that doesn't communicate properly (or at all) over SMBus, then the computer will complain and won't charge the battery. Sorry, Dell has us all right where they want us. Find a used actual Dell adapter on eBay for $20 if you can.

Posted on Mar 30, 2010

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SOURCE: dell c640 laptop when not power on when using ac

Yes, you should replace you battery, go http://www.feevoo.com , you can find many cheap laptop battery, laptop accessories there.

Posted on Jun 25, 2010

  • 4 Answers

SOURCE: dell laptop screen goes blank when ac adapter plugged in

I believe I have found the problem with the 1525 that I am currently working on which has the same problem that you describe. Ultimately I think it's a problem with the inverter in the LCD. When the laptop is powered by battery the brightness is lower than full. When I plug in the power adapter the brightness goes to "full" and I hear a faint sizzle and the LCD's backlight goes off. Same as if you hold the Fn key and press the up arrow to brighten it, it will do the same thing when you reach near the full brightness. So for now I have fixed this problem by going in the Power Options and clicked on Adjust the display brightness on the left. Slide the slider to the left on the "plugged in" part and now when you plug it in it shouldn't make it go blank. I do want to note that I hear a faint buzz coming from the LCD when I plug it in. That must mean the inverter is faulty. WAY TO GO DELL!!!!!!

Posted on Jul 24, 2010

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Screen only lights up on battery power but no ac adapter/charger tried three ac chargers all do the same thing so its not screen or charger


Hi David
It sounds like a fault to its power transition section circuit. Actually, this circuit is built inside the mother board to your laptop.
Please contact the authorized service center, and describe and show them the problem you do experience now, with your laptop. It can be rectified. Gopakumar Gopalan Google

Feb 28, 2014 | Acer Aspire 7720 Notebook

1 Answer

New AC Adapter Will Not Charge Battery/Operate Computer


Most probably static electricity killed some circuitry inside your laptop.

Nov 12, 2009 | Acer Aspire 3610 Notebook

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My compaq presario 1200xl310's monitor remains black. I just purchased a new ac adapter for it. It had been unused for about a month. When I inserted the new adapter and powered it up---no screenlight-up....


You may have a defective CCFL backlight, it may have the following symptom: Screen flashes on and off or displays reddish pink hue. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickers on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replace the CCFL lamp.
To determine if the video card or the LCD is faulty, connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight. It could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out, this is the most likely case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out LCD Parts for service, parts, and DIY info Use this link to their WEB site :-
www.lcdparts.net

Sep 30, 2009 | Compaq Presario 1200 Notebook

1 Answer

Hi I have a acer aspire 1694WLMi laptop which doesn't charge fully. Also when the ac adapter is connected the screen keeps flashing between battery mode and ac mode.


The source of the problem obviously is either the AC power cord or the battery, or it could be a combination of the two. In terms of the symptoms you describe, it could be a faulty AC cord. This could involve a few possiblities: loose connection between the AC plug and the AC adapter unit, a loose connection between the mini plug (the part that goes into your laptop) and the AC adapter unit, or the AC unit itself could be going bad.

Not sure how intermittent the flashing between battery and ac mode is. If you're talking very frequent such as once every minute or so, I would be suspicious of either the plug (both AC and input to laptop sides) or the connections between the AC adapter portion and the plug. Not sure how long you've had the laptop and cord, but it is possible that the cord has somehow worn out. This wearing out can be accelerated if you often use the AC cord and there is tension on it.

One finally suggestion of course is to either try a new cord. You can often find them on e-bay and can even purchase used ones for a cheap price. If you do, you will then obviously be able to confirm that the cord was the problem. One might think or say the battery is not charging fully and is the problem. True, the battery may be a problem, but the root cause may be the cord.

Good luck!

I Fix It

Aug 14, 2009 | Computers & Internet

2 Answers

Laptop ACER Aspire 4920 Screen goes dim.


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!!
F.R.C.

Jul 14, 2009 | Acer Aspire 5500 5570-2609 Laptop

1 Answer

Screen flickers on Acer Aspire A150 Netbook


Hello,

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.

I hope this helps, If so please rate my solution.

Buddy
Corporate Computer
www.ccl-la.com

Jul 08, 2009 | Acer Aspire One A150-1006 Notebook

1 Answer

Dead laptop


Hi,
take out the battery of the laptop and try starting it on the AC adapter,
if it doesn't work, if your friend has the sam ac adapter try starting your system with a different Ac adapter, if nothing of this works

call your laptops technical support

Further Queries are welcome
If you think my solution was helpfull please do rate me

Feb 21, 2009 | Computers & Internet

2 Answers

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.

Aug 08, 2008 | Acer Aspire 5500 5570-2609 Laptop

1 Answer

Not a typical backlight issue


Hi!

You can check the brightness with AC in the BIOS and match it with running in battery or else, when you plug the ac adapter, the lcd goes dim, press and hold the FN buttong and tap the up arrow then reboot and try to see if it will still do it. But still the best way to do it is going to the BIOS by pressing F2 at the Dell logo startup.

Hope this helps!

Thanks,

Karlox™

Jul 30, 2008 | Dell Inspiron 1150 Notebook

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