Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Backlight shorts in and out

Posted on 2008-06-18
7
2,103 Views
Last Modified: 2013-11-09
Hello,

 

I am working on a Dell D505 laptop. The display is dark when operating.  When I put pressure on a small area near the power button the display will come to life with the normal backlight display.  I have noticed when I put apply some light pressure on the left side of the power buton PCB (pushing it ever so slightly to the left) I will get the full normal display otherwise I get just a dark display.  I have taken the laptop completely apart and cleaned underneath the motherboard.  I have not noticed anything unusual that would be causing a short. What could be causing this problem? I appreciate any and all help with this problem.
0
Comment
Question by:compucharley
7 Comments
 
LVL 6

Assisted Solution

by:Sh4d1
Sh4d1 earned 150 total points
ID: 21813218
I had this problem on one LCD. It is due to detached cables from board. You can only complain this or put it to servis. They need to cables to right place on board or change board.
0
 

Author Comment

by:compucharley
ID: 21814581
I have checked the cable to t he board they seem ok as far as being connected.
0
 
LVL 27

Expert Comment

by:David-Howard
ID: 21816430
I read a bit on your issue and I found multiple sites that state it could be the laptop inverter.
The inverter is normally located at the bottom of the LCD itself and not under the motherboard. This would explain why you didn't locate any loose cables (If it's the inverter.)
The first link states the probable cause along with screen shots.
http://www.laptoprepair101.com/laptop/2007/01/31/replace-screen-inverter-fix-backlight/comment-page-8/
http://www.laptoprepair.co.uk/laptop-backlight-problem-dim-screen.html
David
0
Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 

Author Comment

by:compucharley
ID: 21816469
I tried a good known display that would eleiminate the the inverter and backlight and got the same results.  It is some underneath the motherboard i suppose tha the short  must be.
0
 
LVL 92

Assisted Solution

by:nobus
nobus earned 150 total points
ID: 21819839
>>  I have checked the cable to t he board they seem ok as far as being connected.  <<   did you remove and reseat it?   if not, try that, and inspect it closely.
0
 
LVL 27

Accepted Solution

by:
David-Howard earned 200 total points
ID: 21834157
Yes, you have most definitely narrowed it down using your monitor troubleshooting method.
The service manual can be found here for your D505.
http://nokomis.k12.il.us/unit-office/technology/downloads/sm.exe/view
(As usual, please take precautions when downloading and scan the file prior to opening.)
David
0
 

Author Comment

by:compucharley
ID: 21835505
Hello,

There is a long bracket just to the right of the small power button PCB.  I noticed when applying about 2lbs of  pressure to this bracket the display would be in a stable/normal state without the pressure the dispaly goes dark.  What I did to repair the problerm was I got a small piece of 1" x 2" piece of plastic and I marked holes to drill my screw holes and pin pointed where the short was most sensitive and glued  two 1/2"x1x2" pieces to my 1" x 2" where I wanted the most pressure to be applied and then there was a screww hole near the corner of the CD-ROM caddy I screwed the opposite end of the 1" x 2" to this screw hole to ancor my little plastic plate and my efforts paid off where ever the ground out was it was eliminated with my fix. I litterally tore the whole laptop apart to see where the short might be and could not find anything that was suspect. Thank you everybody for your help.
0

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction: When a connection to the internet is established, there always exists a modem between the connected device and the ISP (Internet Service Provider). The Operating System (OS) on your PC controls the modem which communicates with the …
Or at least that’s the word according to a new blog from Tech Target on AWS’s new Managed Services (MS) offering. According to the blog, AWS is launching their AWS MS program to expedite the adoption of cloud by Fortune 1000 and Global 2000 companie…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question