Solved

further laptop LCD question

Posted on 2001-06-25
7
230 Views
Last Modified: 2010-04-27
I posted a question about my laptop's LCD blacking out from time to time (only fixed by reboots). So now...

1) I ruled out a BIOS problem
2) I ruled out any other software problems
3) The LCD does not black out when I touch the screen or move it open and shut

but,

4) It blacks out when I touch the  AC power supply cable where it connects to the laptop

SO IS IT A DIRTY CONNECTION I COULD CLEAN WITH ELECTRONIC CLEANER, IS IT A BAD AC POWER SUPPLY CABLE, OR IS IT A LOOSE SOLDER CONNECTION INSIDE THE LAPTOP NEAR THE AC OUTLET?

or something else or combo of above?...
0
Comment
Question by:jefhatfield
7 Comments
 

Expert Comment

by:Kiekerjan
Comment Utility
Dous the problem also show up when you use the internal powersupply?
0
 
LVL 32

Accepted Solution

by:
jhance earned 50 total points
Comment Utility
I really doubt that this is a simple as cleaning a dirty connector.  If that were the case, I'd suspect that you would disrupt other things in the laptop as well when the screen dims.

My guess is that you have a bad connection inside the laptop where the power to the LCD panel taps off.  Could be a bad component, a bad solder joint, a broken connector, or a broken circut board connection, to name a few.

If you're comfortable with disassembling your laptop (i.e. you're experienced in handling sensitive electronics) then it may be worthwhile opening it up and taking a look.  Be aware the opening up laptops is often difficult and you can very easily damage the case or the components if you are not careful.  Further, they are often put together like those Chinese puzzles.  Many interlocking pieces that all seem to need to come apart at once.

Is the laptop under warranty?  If so, don't risk voiding the warranty by trying to fix it yourself.  If it's not under warranty, you may find that laptop repair prices are very high and it might not be worth fixing.

In any case, it seems pretty clear from your description and history that it's not a simple "outside the case" fix.
0
 
LVL 13

Expert Comment

by:magarity
Comment Utility
Rather than inside the laptop, I suspect the cable.  I had a laptop die because the power cable broke inside the flexible part where the cable goes from being just cable to being the hard connector into the laptop, know what I mean?

This is a replaceable part and shouldn't cost too much to try.
0
Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

 
LVL 32

Expert Comment

by:jhance
Comment Utility
Magarity,

Any ideas why this would only affect the LCD?

It seems to me that if it were the connector itself, which provides power to the entire unit (and I guess I also assume that this thing has a battery and so it really should keep working even if the plug is removed) why doesn't the thing shutdown or crash.

I think that wherever the problem lies, it's in a part of the laptop that is specific to the LCD.
0
 
LVL 31

Expert Comment

by:rid
Comment Utility
I would go with jhance on this one. Many connections inside laptops are a sort of ribbon cable that are nothing but metal traces on flexible plastic. The contact surfaces i the ends are often silver and they are sort of clamped or pinched in the connectors on the circuit boards. These connectors are not an ideal design (in my opinion) as poor contact develops from time to time. Disconnecting and reseating have helped for me in some instances. Once I ran into one such "cable" where a trace had broken (going from MB to the screen, actually; the bending in the joint obviously did this). Some laptops let you remove the keyboard pretty easily, and this gives you a good view over the internal organs, including perhaps some of these connections.
Regards
/RID
0
 

Author Comment

by:jefhatfield
Comment Utility
i gues if it were the cable only, i would lose all power (i don't have a battery on this machine...it died a long time ago...one of those NiMH models)

maybe either a connector is loose or a component is shot..i will have to look inside this machine but i hope to get a spec sheet on this model (first introduced in late 1998...Compaq Presario 1272: 366/32/3.2 so it's pretty old at 2.5 years in this field

i am just a desktop repairman with some knowledge of networking...hardly the type who will open up a laptop, but no shop where i live in my rural area will even attempt it...i would have to travel to San Jose to find someone willing to fix an older laptop like this one w/o a spec sheet

jefhatfield
0
 

Author Comment

by:jefhatfield
Comment Utility
one thing i forgot to mention...i got two blackscreens in may and 5 in june...all during bootup except for once when i was on the internet...i don't think this will change the result

thanks all for your thoughtful answers

jh
0

Featured Post

What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

Join & Write a Comment

Moving your enterprise fax infrastructure from in-house fax machines and servers to the cloud makes sense — from both an efficiency and productivity standpoint. But does migrating to a cloud fax solution mean you will no longer be able to send or re…
What do we know about Legacy Video Conferencing? - Full IT support needed! - Complicated systems at outrageous prices! - Intense training required! Highfive believes we need to embrace a new alternative.
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

763 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

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now