Question about Toshiba Satellite M65-S809 Notebook

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No backlight/display I have replaced the inverter bd with a new one and still have no backlight. Can't tell if theres info being displayed either.

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Generally I replace the inverter board and tube light in pairs at the same time, due to changes possibly made during production.

If you are trying to test the board itself for output, use extreme caution, as there are some pretty high volatges around that inverter board!

My suggestion is if you want to save yourself alot of aggravation, replace the bulbs too.

Posted on Apr 16, 2008

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Upper sise of screen flickering problem


Technology b> A laptop's display assembly consists of an LCD panel, an inverter board and a backlight lamp. The inverter board supplies power to the lamp which lights up the LCD screen as it generates images. Light from the lamp is then uniformly distributed over the panel to create images. b> Cause b> Flickering is commonly caused by a damaged or malfunctioning inverter. Because a faulty inverter is not able to supply adequate power to the backlight lamp, the screen goes dim each time the backlight loses power. In some cases, flickering may also be caused by a faulty connection between the inverter and backlight lamp. Diagnosis b> Resolving a laptop screen's flickering problem entails correctly diagnosing the problem and replacing the faulty component. You may diagnose the problem by hooking up the laptop to an external display unit, such as a projector. If the external display has the same display problem as the laptop's LCD screen, it is indicative of a motherboard or video card problem. If the external unit displays bright, crisp images, the problem is probably caused by the backlight or inverter. b> Solution b> You may repair a laptop screen's flickering problem by replacing the inverter board or backlight. Order parts from a trusted supplier and replace the component by referring to your product documentation.
http://www.tech-faq.com/how-to-repair-a-laptop-screen.html http://www.laptop-repair.info/laptop_screen_repair.html b> Hope this helps.

Jan 21, 2013 | Lenovo IdeaPad S300 59359327 Silver Gray...

1 Answer

Are the display bands compatible?


1) Toshiba Satellite P300-13j LCD screen example,

http://www.screentekinc.com/Toshiba_Satellite_P300D-13J--17-inch--1440x900-wxgaplus-laptop-lcd-screen.shtml

Thin Film Transistor (TFT) Active Matrix LCD screen, that is WXGA, and uses one CCFL for a Backlight.

2) http://www.lcds4less.com/ToshibaLaptop__Toshiba_Satellite_P300D-12L__laptop-screens.html

Thin Film Transistor (TFT) Active Matrix LCD screen, that is WXGA, and has 1 CCFL for a Backlight.

There is a pretty good chance. The screen Inverter and LCD screen are a matched unit. I would remove the screen Inverter from the P300-12L, and use it also.

Looks like this,

http://www.lcd-inverter-shop.com/Toshiba/Toshiba-Satellite-P300D.html

If I may ask;
1) Is there obvious damage to the LCD screen?

2) If there is not obvious damage to the LCD screen, have you used an external VGA monitor with the laptop?

To see if the problem is the graphics chipset, or the video cable, or inside the Display Assembly.

A) http://www.irisvista.com/tech/laptops/Toshiba-Satellite-P305/take-apart-notebook-1.htm

B) http://www.irisvista.com/tech/laptops/Toshiba-Satellite-P105-P100/remove-lcd-screen-inverter-1.htm


Post back in a Comment.
Regards,
joecoolvette

[Primer:
An LCD screen cannot produce light by itself,
(Click on the monitor icon,

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

It 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.

LED stands for Light Emitting Diode

CCFL stands for Cold Cathode Fluorescent Lamp.
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/

Observe the last 8 photos especially. This article shows you that the LCD screen is an assembly. It is composed of layers. Just like the 3M company's tutorial. Also shows general instructions for replacing a Backlight.

A screen Inverter is used to convert the power from the laptop, for the LCD screen, and Backlight.
It is a small circuit board, and is usually mounted towards the bottom of the LCD screen, and behind the Display Bezel.

A CCFL, (Or two of them), uses a screen Inverter.
LED backlighting however, may or may not use a screen Inverter.

Using LED's for backlighting is relatively new, when discussing backlighting technology.
Some of the first designs of LED backlighting does use a screen Inverter.
Newer designs do not seem to.

90 PERCENT OF THE TIME the problem can be attributed to a bad screen Inverter.

Aug 21, 2012 | Toshiba Satellite Computers & Internet

1 Answer

My screen on my laptop just went all black with a very faint image. what is wrong there, how do i fix it, and what made this happen?


A) What is wrong?;
Your Backlight has gone bad, or the Inverter.

B) How do I fix it?
Replace the Backlight bulb, or the Inverter

C) Backlight bulb's, and Inverters, like everything have a 'lifespan'
This one is at the end of it's. (Stating the Backlight or the Inverter

From here all I can give you is Generic information, since I do not have the laptop manufacturer name, and Model Number. This is on the bottom of the laptop.

1) An LCD screen cannot produce enough light by itself. A Backlight bulb, (Or more than one), is used to emit enough light.

2) A laptop cannot produce enough power to power the LCD screen, and is also used for power to the Backlight.

I'll have to discuss the way the Display Assembly is put together, and name parts in order to explain the following of how to repair. Again, generic information.

1a) The plastic top of the laptop is the Top Cover. There are different names used by different manufacturers.

1b) Looking at the LCD screen with the laptop open, there is a plastic frame that goes around the edges of the LCD screen, and is in Front.
This is the Display Bezel

1c) The LCD screen is behind the Display Bezel. The LCD screen is a composite of layers. The outside layer that faces you is a protective screen.
Around these layers composing the LCD screen, is a metal frame.
One side, (Or both sides) of the metal frame is removed to access the Backlight bulb.

1d) The Backlight bulb is a CCFL.
Cold Cathode Fluorescent Lamp.
Very similar to the fluorescent lamps, (Bulbs) uses in residential, and commercial applications, but on a MUCH smaller scale.

Now to show you generic laptop info on replacing the Backlight bulb for them.

A) http://www.insidemylaptop.com/category/backlight/

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

If I had the laptop manufacturer name, and Model Number, I could try to give you a link to the Service Manual for the laptop. (Free. Usually from the laptop manufacturer)
This way you would have Exact info on how to disassemble your laptop's Display Assembly.
Post in a Comment.

Oct 13, 2010 | Computers & Internet

1 Answer

I can not see my desktop its too dim


The backlight in your display has gone out. Usually this is due to a bad inverter, although sometimes the lamp itself goes bad.

Replacing the inverter is fairly easy. It's a small circuit board at the bottom of the display. Remove the display bezel, unplug a couple of cables, put the replacement inverter board in and reassemble. There are several sources for inverters. eBay is a good place to start; here's a sale going on now.

Replacing the backlight itself is much more difficult (it's built into the display), and it's usually easier to replace the entire display panel. Again there are several sources with prices in the range of $110 to $150.

Hope this helps. Thanks for using Fixya!

Feb 26, 2010 | Gateway M-6750 PC Notebook

1 Answer

Toshiba P10 laptop screen no longer works.


It's not the inverter but the biotin backlight bulb that lights the display from underneath. The screen needs to be replaced unless you want to try and rebuild it and replace the backlight bulb. New screens from EBay should not be more than 70-100 bucks. If you want to try and replace the backlight bulb, the link is below for the procedure.....

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

Nov 03, 2009 | Toshiba Satellite LP154W01 Notebook

2 Answers

I have a Fujitsu Siemens Lifebook s7020 with no backlight. The display is showing everything but it's hard to see because there's no backlight. Everything is also fine with an external screen. I have a...


The Inverter board must be tested and eventually replaced. The inverter is the small board located at the base of display. This is connected to one side to the backlight lamp, to which supplies AC high voltage, and on the other side to motherboard, where receives DC voltage.

Inverter contacts to otherboard and to lamp must be tested , using a multimeter to read volts. The inverter is an AC board, and for safety reason the test must be done by a trained repairer.
If the inverter is OK check the contacts to motherboard and wiring harness to motherboard..

Also ensure that light is not just dimmer because energy save mode is on, or because the laptop is running on batteries.

Sep 07, 2009 | Fujitsu Siemens LifeBook S7020 Notebook

1 Answer

Dim display ... no backlight


You most likely have a defective screen - a defective inverter or a CCFL lamp or simply the video cable needs reseating. After reseating the video cable and the problem is still there then :-
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:

  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display or appear black.
  • Picture flickering 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 replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, 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 and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

May 30, 2009 | Toshiba Qosmio G25 (G25-AV513) PC Notebook

1 Answer

Backlight wont stay on


The inverter board which provides the backlight power isn't working properly. This is a pretty common problem with LCD screens. The inverter is in the display, mounted under the display panel. It's a fairly simple job to replace the inverter. You have to remove the screws holding the front of the display to the back and separate the pieces. The inverter is held in place by a couple of screws and has a couple of cables connecting it to the main board and display panel. Unplug those, remove the inverter, mount the replacement and plug the cables back in. Then reassemble the display. A search on Google for "acer 5315 inverter" turned up several sources for the replacement part. Here is one. I don't know anything about this seller; I just picked it as an example.

May 19, 2009 | Acer Aspire 5315 Notebook

1 Answer

Blank Display, using exernal monitor, can see display info w/flashlight, display flashes light at startup


You could have a defective screen - a defective inverter or a CCFL lamp.
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:

  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display.
  • Picture flickering 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 replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, 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 and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

May 03, 2009 | Toshiba Satellite A135-S4407 Notebook

1 Answer

Very Dim display


If you have tried all the usual adjustments (brightness etc), then the inverter board or the backlight itself is bad.

It's pretty hard to tell which one it could be, given as they are both related (the inverter board powers the backlight)

I had that happen to a few 192N's, and it was a bad inverter board in both cases.

Feb 08, 2008 | Samsung SyncMaster 172N 17" LCD Monitor

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