Question about IBM ThinkPad T42 Notebook

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A little while ago the LCD backlight started going off after 5 seconds (when warm) to 30 seconds (when cold). I think I may have bumped the screen. But anyway, what might be wrong with my screen and how hard is it to fix?

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The blacklight inverter or power supply is usually the problem when this happens.
Depening on the model of the notebook the blacklight is fair - moderate to fix. All you need is a backlight inverter (its like the ballast in the lcd)
the light is usually a thin light at the bottom of the lcd. You can find them on ebay pretty cheap. I would defintally recommend if you take it apart to buy the bulb and the inverter that way you can replace both to save you trouble in the future. Again this can be pretty hard depending on the notebook so be careful you can easly damage the notebook. Thanks
Steven.

Posted on Apr 29, 2010

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Putting freon in system using artic freeze compressor cycling way to fast I think probably every 15 seconds.


The compressor is doing this because the system is low on refridgerent, did you pull at least a 30" vacuum on the system before starting to charge it?

Jun 23, 2016 | Cars & Trucks

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My acer aspire 4315 lcd is faulty...i can see in it but its so dark


kezler_0007,

I have found in the 8 years of being online, and providing answers/solutions to people's computer problems; that coming across, and trying to explain the answer/solution, is the hardest thing to do.

It appears I have failed you

Let's try again;

1) Perusing the internet, I look at what LCD screens are offered, (Aspire 4315 series of Notebook PC's), and see what backlighting is offered.

I have seen LCD screen examples offered, that seem to be CCFL backlighting.
I DO have to know however, WHAT style of backlighting is used for YOUR laptop.

Do Not want to make a mistake here, because the mistake could cost you five times as much.

You buy a not needed LCD screen, about $100, and only needed a screen Inverter; about $18.

!O_O!?

IF, your laptop states LED backlighting, THEN the only option is to buy the entire LCD screen.
With LED backlighting, the LED backlighting is incorporated into the LCD screen assembly.

There is no simply replace the LED backlighting.

With a laptop that uses CCFL for backlighting, the first thing to do is replace the screen Inverter.
90 PERCENT OF THE TIME the fault is a bad screen Inverter.

Allow me to state the primer over again, now that I have more room;

An LCD screen does Not produce light,

http://solutions.3m.com/wps/portal/3M/en_US/NA_Optical/Systems/BehindTheScenes/Optics101/

(Click on the monitor icon)

Therefore an LCD screen needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, (Or two of them), Or a series of LED's.
(Light Emitting Diode)

When I state series, I mean a LOT of LED's. They are incorporated into the LCD screen assembly.
(You see from the above link that an LCD screen is an assembly)

A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height,

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

View the last 8 photos to see what an average CCFL looks like.

Know this also; A CCFL is a Fluorescent bulb.
This means it has MERCURY in it.
VERY dangerous if the bulb breaks!
Mercury is POISON to the human body.

IF, it is determined that the laptop uses CCFL/s for a Backlight, -> AND the CCFL/s are bad, I implore you to have a pro change it/them.
The other option would be to replace the LCD screen.
The CCFL is incorporated into the LCD screen assembly.

HOWEVER, I still go with the screen Inverter is bad.
(IF, the laptop uses CCFL for a Backlight)

1) http://www.screenaid.com/acer-aspire-43152004-laptop-lcd-screen-141-wxga-glossy-ccfl-backlight-p-7495.html

2) http://battery-adapter.com/product_info.php/products_id/3773/vAspire+4315+Series

3) http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-acer

Go to the 'paragraph' that starts with Aspire 1200. (1200 in Blue)
Drop down to the 4th line, (3810T in blue), scroll across, and click on - 4315

This is a free Service Manual.
It is in PDF file form.
The computer you are using now has Adobe Reader on it, which uses PDF files.

After you click on the file name (4315) it may take up to 30 seconds, before the first page comes up.
(The file is downloading in the background)

[May be on my end, but it took 44 seconds just now, and using a medium speed DSL connection. Usually takes 10 to 12 seconds. Just letting you know so you do not think the link doesn't work ]

LCD Module Disassembly Process - Page 86

Hmmm, also states Inverter Board. (screen Inverter)

Removing the LCD Module is on Page 71.

4) NOT an Acer Aspire 4315 series of Notebook PC; Aspire 3810T. Posted so you would be able to get a more 'Hands on' idea, of working on your laptop,

http://www.insidemylaptop.com/replace-broken-screen-acer-aspire-3810t-laptop/

Test the screen Inverter before replacing?
IF you have a sensitive multimeter, you can. Otherwise IMHO the choice is to just replace the screen Inverter.
Parts changing I know, and I abhor it; but if it is your only choice?

http://www.fonerbooks.com/test.htm

Where in the Philippines to order from? Do not know.
Suggest using the internet.

For additional questions please post in a Comment.

Regards,
joecoolvette

Nov 03, 2012 | Acer Aspire 4315 Notebook

2 Answers

Toshiba l505 s6959 screen flicker


bluestang65c,

An LCD screen cannot produce light by itself.

http://solutions.3m.com/wps/portal/3M/en_US/Vikuiti1/BrandProducts/secondary/optics101/

It needs an additional light source. The additional light source is a Backlight.
A Backlight can be a CCFL, or a series of LED's used as lights.

Your Toshiba Satellite L505-S6959 Notebook PC, uses a single CCFL as a Backlight,

http://www.laptopscreen.com/English/model/Toshiba/SATELLITE~L505-S6959/

A CCFL is a Cold Cathode Fluorescent Lamp. Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
(Average size is 2mm Thick. Length is almost as long, as the LCD screen is in height. 2mm is a little larger than 1/16th of an Inch )

A screen Inverter is used to convert the power from the laptop, for the Backlight, and LCD screen.

Your screen Inverter is going bad.

One example of a screen Inverter for your laptop,

http://nylaptopparts.com/index.php?main_page=product_info&cPath=98_101&products_id=779

The plastic 'frame' in front of your LCD screen, is the LCD Bezel Assembly. (Toshiba)
Behind it, and mounted at the bottom of the LCD Screen Frame, is the screen Inverter.

Pictorial guide in replacing,

http://www.irisvista.com/tech/laptops/Toshiba-Satellite-L500-L505/remove-lcd-screen-inverter-1.htm

[ Remove ALL power from the laptop. Remove the AC adapter (Charger) and Battery. Follow Anti-Static Precautions ]

This is a link to a free Service Manual,

http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-toshiba

Drop down to the subheading - Satellite A10 (A10 in blue)
Go to the 3rd line in this 'paragraph', (L350D), scroll across, and left-click on L500. (The L505 is part of the L500 series)

Ignore if you are aware of the following;
This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the file name (L500) it may take up to 30 seconds, before the first page comes up.

(Page 170 in the PDF file header. LCD Bezel Assembly )

For additional questions post in a Comment.

Regards,
joecoolvette

May 21, 2012 | Toshiba Satellite L505-S5988 Notebook

1 Answer

How to replace LCD panel on Toshiba Satellite M105-S3004 Notebook?


Plastic Display Bezel is not as simpy as you think. It is made of space-age plastic.

Procedure is the same as for a Satellite M110 series, and M115 series Notebook PC,

http://www.irisvista.com/tech/laptops/Toshiba-Satellite-M115/remove-inverter-replace-lcd-screen.htm

Just to add;

http://www.irisvista.com/tech/laptops/Toshiba-Satellite-M105/take-apart-notebook-1.htm

After the Screw Covers are removed, and the screws, from the Display Bezel, the Bezel can be 'popped' off.

The Bezel has plastic protrusions, or tabs, extruded from it's plastic frame. These tabs snap into place in the Display Cover. (Top cover of laptop)

There are tabs formed on the inside edge of the Display Cover, that the tabs from the Display Bezel, snap into.

When I started years ago, I used a guitar pick to ease the Bezel up, so I could get my fingertips under it. (OUTSIDE edge of Bezel. Not inside edge where the LCD screen is)

Now I don a set of anti-static gloves, and ease the inside middle edge of the Bezel, (LCD screen side), up. Then I start working towards one corner, until this portion pops free, and then I go towards the other corner.

Once you work a side loose, and the bottom, the rest of the Bezel starts popping free.

Although the Display Bezel looks to be flimsy, as stated previously it is made of a space-age plastic. Pretty tough stuff, really.
Just go slow, and use care.

When you hear the tabs pop up for the first time, you may think you have broken something. Nope.
Just wanted to state to ease your mind.

Make SURE the LCD screen you are purchasing is THE correct one.
An LCD screen, and the screen Inverter, are a MATCHING pair.

Crossover the manufacturer name, and model number on the back of the LCD screen, to the new one.
Or go with the LCD screen replacement manufacturer's information. B

If so, be sure there is a Return option, if the new replacement LCD screen proves to be the wrong one

[ An LCD screen does not produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

(Some of the newer LCD screens use LED lights for a Backlight.
The Toshiba Satellite M105-S3004 Notebook PC, uses a CCFL for a Backlight)

A screen Inverter is used to convert the electricity (Power) from the laptop, for the Backlight, and the LCD screen ]

For additional questions please post in a Comment.

Regards,
joecoolvette

Jan 04, 2012 | Toshiba Computers & Internet

1 Answer

Black screen - audio works - hp logo on start - then goes black


It is either the power supply or the backlight inverter board finally failed. You will need to do some voltages checking inside, also see if you can see any bad caps in the power supply.
See my troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

Parts: www.shopjimmy.com

Jun 15, 2010 | HP LC2640N 26 in. HDTV-Ready LCD...

1 Answer

It started flickering then went black. When powered off and then back on, it will work for a couple of seconds then go black.


Hi!

I think what your monitor is experiencing right now is because of the backlight inverter in your lcd monitor is about to give up...The backlight inverter is a cold cathode light thats responsible for the image in your screen.. if the lights located on the upper and lower edge of the monitor will be busted then what you will see is black screen.. You will need to replace that in your monitor.

However, without the proper skills to do that and proper tools to open the monitor.. it will be risky for the safety of your monitor..

I suggest that you bring your monitor to a credible technician to replace busted backlight or (burned high voltage ballast transformer - supplying current to backlight)


I hope this help..

Much appreciated if you rate this help..thanks..


May 23, 2010 | Dell UltraSharp 1704FPT 17" Flat Panel LCD...

1 Answer

Approximately 2/3 of the screen is dark. this started about six months ago and is progressively becoming worse. when problem began the screen would recover to full brightness after it was on for 30...


Hi there...it is sounding like a backlight is going/has gone out...these can be proffesionally replacedat a repair shop...To self diagnose if it is the backlight take a flashlight and, with tv on and while on a tv channel and carefully form different angles look into the 'dark' part of the tv screen...if the/a backlight on a lcd tv/monitor goes out(even laptop screens) then u can still see a faint image with a flashlight(or without one with a good eye)....If you still see the (tv channel) image, then it is most likely a bad backlight......
I hope this helped you some, if it did(or not) please rate!...Thank you

Apr 16, 2010 | Sony BRAVIA KDL-40S2000 40 in. LCD HDTV

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Engine knocking at the first start in the morning


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May 22, 2009 | Westinghouse LTV-27w7 7 in. LCD HDTV

1 Answer

LCD Monitor picture cutting out occasionally.


Your CCFLs might be going bad. CCFL stands for Cold cathode fluorescent lamps. These are the lamps that provide backlight for the LCD Monitor. These lamps do not last forever, and are a very common part to go bad. The circuit that provides the power for the CCFL is called the inverter, it might be going bad, but I still think it is the CCFL. Only trained techs should try and replace a CCFL or fix an Inverter. CCFLs do contain mercury, but only small amounts.

Since the monitor works for a few minutes and then goes dark, this tells me you have a problem with the backlight function. I have seen this several times, and I do work on LCD monitors professionally.

http://en.wikipedia.org/wiki/Cold_cathod...

My advice, get a new LCD monitor and sell your bad one on ebay.

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