Question about Dell Latitude C640 Notebook

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Dell C640 LCD dims when on battery power

Every time I take the AC cable out the LSD display dims when running on battery power. Is there anything I can do to solve this?

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When you turn your laptop on press F2 to go to the system settings Continue to press alt+p till you get to a page about battery usage then turn everything up to max. hope this helps

Posted on Aug 17, 2007

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My IBM Thinkpad has separate user configurable settings for power - one when connected to AC and the other when on battery power. In order to conserve battery power, the LCD is dimmed and the CUP speed is reduced among other things. These can be changed by the user to behave similar to when connected to AC power with a resulting shorter battery life. Check your laptop's user manual to see if they are doing something similar.

Posted on Aug 14, 2007

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According to craig13 if you are not satisfied with the power settings then you can check your battery status may be it is charging 100% ok. but in onload mode it is not supplying the sufficient current for your notebook according to it's requirement. so try it by replacing the battery. otherwise in hardware section there might be some kind of power consumption is more. and suppose if so first off all you check hard disk.

Posted on Aug 14, 2007

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Probably not. My HP does the same thing but it is not that a noticeable change. If yours is dimming severely, look at the power settings and boost the contrast up.

Posted on Aug 14, 2007

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SOURCE: Dell C640 LCD dims when on battery power

You can also presss "fn" and the "up" arrow. This will increase your screens brightness.

Posted on Jun 19, 2009

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MY dell tatitude c640 battery is not charging, it power by AC (meaning the charger), the battery is charging in another latitude c640 latop. what is the fault, and how can i repair it
chances are the actual power jack in the laptop has gone bad. this is a common issue with lots of laptops and every dell laptop (4) that i have owned http://www.ebay.com/itm/like/281152320878?ul_noapp=true&chn=ps&lpid=82

May 09, 2014 | Dell Latitude C640 Notebook

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Dell c640 notebook runs on charger but will not stay powered with the new battery ,i put a fullcharged battery in and it still powers down but runs fine on charger the battery is good it works fine in my...
You probably have a defective battery connection or circuit on the motherboard. It will have to be replaced or repaired.

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My dell inspiron 6400 won't start, red light then green light flashes ansd nothing happens, try to take out the battery and putting it back, no results, help
The following troubleshooting guidelines are basic troubleshooting steps. Battery Charging It is recommended to charge the battery while the system is off for faster charge times. Users may notice longer charge times when the system is powered on and running graphics extensive applications.
No POST If the system does not perform a Power On Self Test, there are various things to look for:
  1. Check to ensure that the system has a power light.
  2. If the system has no power light, ensure that it is plugged into AC power. Remove the battery.
  3. If the system has power but is not performing a POST, check to see if the keyboard status lights flash to indicate a successful POST, but no video, or that the keyboard status lights are lit in a sequence indicating a system problem.
bios_leds-1.jpg
  1. With the power off and the system unplugged, remove all CRUs from the system and reconnect that AC adapter to the system and try again.
  2. Run the On Board Diagnostics (OBD).
Video If the LCD on the system shows no display, or has other LCD problems, there are some basic steps to take:
  1. If the LCD is not displaying video or the video is garbled, run the BIST Test.
  2. If the LCD is not displaying any video, connect an external monitor to eliminate a no POST problem. A good image on the external monitor eliminates a video card problem or a POST problem.
  3. Connect an external monitor when possible for all LCD related problems, to help eliminate a software possibility or video card problem.
  4. If the LCD has extremely dim video, attempt to adjust the brightness or connect an AC adapter to eliminate a power management conservation setting set in the BIOS.
  5. If the LCD has lines on the screen, check the system during POST as well as system setup to verify if the lines are present in all modes of operation. Run the BIST Utility.
  6. If the LCD has color problems, run the BIST Utility.
  7. Run the On Board Diagnostics (OBD).

Jul 19, 2011 | Dell Inspiron 6400 Notebook

1 Answer

Dell c640 wont start up by pressing power button on battery power but will start on ac power and will remain on using ac power and when unplugged using battery power. System diagnostics indicates lcd...
Yes you can still use it without the battery. Of course you will need a battery replacement to surf without AC power.

Post back!

Oct 03, 2010 | Dell Latitude C640 Notebook

2 Answers

Dell c640 laptop when not power on when using ac
The battery has a dry cell causing this so replace the battery

Jun 20, 2010 | Dell Latitude C640 Notebook

1 Answer

The screen on my Dell Inspiron won't illuminate. The screen does display, but extremely faintly. Pushing the function and f8 keys does make it illuminate briefly, but then it goes straight to black again....
Sounds like a failure of the LCD backlight. This will require replacement of the inverter or the LCD itself:
http://support.dell.com/support/edocs/systems/Latc640/sm_en/display.htm#1001077
You can buy parts here:
http://shop.ebay.com/?_from=R40&_trksid=p3907.m38.l1313&_nkw=C640+LCD&_sacat=See-All-Categories

Apr 11, 2010 | Dell Latitude C640 Notebook

2 Answers

I have a Dell laptop D505. The laptop powers up but the screen display is very dim. I can't see the image on the monitor. I've tried to manually increase the color/brightness button and nothing changes. ...
Sounds like your inverter or your backlight is failing. The inverter is an easy repair, the backlight can be replaced but it involves taking the LCD panel apart, The backlight comes installed on new screens. I can include a service manual below and possibly a generic guide to backlight replacement....

http://support.dell.com/support/edocs/systems/latd505/sm/display.htm#1052500

http://www.laptoprepair101.com/laptop/2007/01/31/replace-screen-inverter-fix-backlight/

Sep 23, 2009 | Dell Latitude D505 Notebook

1 Answer

New battery and still won't charge.
first, check that the battery connection isn't blocked by a sticker or something.
second: try disconnecting the battery and ac and hold the power button for 1 minute. then give the battery and ac another try.

let us know how it goes.

if it still doesn't work, time for a warranty replacement.

Jun 30, 2009 | Dell Latitude C640 Notebook

2 Answers

Dell C640 LCD dims when on battery power
You can also presss "fn" and the "up" arrow. This will increase your screens brightness.

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Dell C640 powers off when lcd is plugged in
There is a possibility that the socket for the lcd ribbon has shorted somewhere, either the socket itself, or the tracks on the motherboard leading to the power supply circuit or video card. If this happens then there is no DIY fix, unless you have PCB cutting equipment or a micro trace pencil. If you are desperate, you can also look into replacing the LCD's power inverter chip. They only cost about $30-40 and may fix the issue if it is blown and trying to pull way too much current.

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