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The led of harddrive is keep on lighting, no screen signal (laptop model lw40 of lg)

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Does the laptop appear to boot up but the screen remains blank?

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

Posted on Sep 30, 2009

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Sanyo DP46142 TV comes on for approximately 30 seconds and then screen goes black. Power LED stays on.


Sounds like a backlight problem to me. If you input a signal to the HDMI or Composite input and then it goes black have you tried taking a flashlight to the screen to see if the picture is still there but just dark? That would indicate a backlight issue. That model appears to be an LED edge lit backlight, so if the picture is still there after going black your going to have to trace out the backlight circuit and see whats going on. Usually with LED backlighting if it comes on at all then the LED's are good, its just the driver supply thats failing to keep them on. Some TV's have a small separate board that provides the backlight control, but i suspect with this model its on the power supply board and not the motherboard. Have you checked that board? It could be bad caps on the power supply board, check the voltages to the backlighting when it lights up and then when it goes dark. It could just be some failed capacitors on the power supply causing that voltage rail to drop off.

May 04, 2017 | Sanyo Televison & Video

1 Answer

LED screen is black, but my tv still gets sound. LG told me this would be $331 for them to fix since the TV isn't under warranty. Could it be as simple a fix as the T-Con board?


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Dec 06, 2016 | LG Televison & Video

1 Answer

How do I get the picture back on my LG LED 50 flat screen? Sound works, no picture.


-You have a bad panel. Led arrays internal to the panel are defective. Replacement cost exceeds economical repair.

Apr 27, 2015 | LG Televison & Video

2 Answers

I cannot download lw40 audio driver


you can download all driver for your laptop form there http://www.notebook-driver.com/lg/lg-notebook-lw40-driver/. and you can only download only sound driver. Right click on the Realtek.zip file and save it on your hard driver after download extract it and then you can install it.
Ihope this information will be helpful.

Jun 21, 2011 | Computers & Internet

1 Answer

LG LW40 will not detect samsung HM 160HC hard drive


The hard drive you are using is either broken or corrupt. Purchase a new hard drive. Unfortunatly the data cannot be recovered.

Jun 17, 2009 | Gateway M350Xb PC Notebook

1 Answer

How to format LW40 EXPRESS


hello dpinner


you may this forum helpfull also LG LW40 Express Touch Pad - Notebook Forums and Laptop Discussion

i will look for a manual for the problem you have.


riz.

Nov 04, 2008 | Computers & Internet

1 Answer

LG LW40 tryi


YA I NEED YOUR LAPTOP CONFIGURATION

Apr 01, 2008 | Computers & Internet

1 Answer

Enabling my headphones on my laptop


Just goto control panel and under sound system properties change the output sound device to headphones . Fixya :)

Aug 26, 2007 | Apple iPhone 3G

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