Question about Toshiba QOSMIO F15-AV201 Notebook

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I have qosmio toshiba f15 lcd light is very weak ( dim ) but LCD & Inverter is oK

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Maybe the lightbulb is bent/damaged or has a wire loosly connected, i dont really know anything about computer hardware, i just know some software issues that can be fixed easily

Posted on Sep 14, 2008

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mastersaintx
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SOURCE: i have qosmio toshiba f15 lcd light is very weak ( dim ) but LCD & Inverter is oK

You can adjust the contrast and brightness using the utility in the lower right corner of your screen or via the display properties window. Right click on your desktop then click properties.

Posted on Jul 27, 2008

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Qosimo e15 av101 back light is dim how do I fix it


swaffordrand,

An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL or a series of LED lights, (For present technology)

The Toshiba Qosmio E15-AV101 uses a CCFL.
Cold Cathode Fluorescent Lamp.

Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
(Usually 2mm Wide, by close to the height of the LCD screen, Long )

A screen Inverter is used to convert the power (Electricity) of the laptop, for the Backlight, and LCD screen.

90 PERCENT OF THE TIME the fault is the screen Inverter.

http://www.pelltechnology.com/Toshiba/Laptop/Toshiba-Portables-Qosmio-E15-Series/AV101/Toshiba-Qosmio-E15-AV101-Backlight-Power-Inverter.html

The front thin plastic frame in front of the LCD screen, is the Display Bezel.
Resembles a picture frame in it's design.

Toshiba's name is Display Mask.

The screen Inverter is located behind the Display Mask, and mounted at an area below the LCD screen.

A) Remove ALL power. Remove the AC adapter (Charger) and Battery.

B) It would be best to buy, and wear an ESD wrist strap. Average cost is around $3 to $6. (Electro Static Discharge}
Connect it's alligator clip to a good ground source.

One example,

http://www.radioshack.com/product/index.jsp?productId=2103245

Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware components inside a computer. The ESD wrist strap prevents that.

It is arguable that you are just replacing a screen Inverter, and the above is 'over-kill'.
I would rather spend $6, and not have to worry that I could accidentally make my laptop an expensive paperweight, or doorstop.

Use a multi-compartment container for the various screws you will remove. SOME screws look VERY similar to other screws.

DO NOT mix them up.

C) Open the laptop, lay the Display Assembly all the way back. (Down)
Pull up on the right Hinge Cover, and remove it. Do the same for the left Hinge Cover.

To the immediate right of the right Hinge Cover, and immediate left of the left Hinge Cover, are two Philips head screws to remove.
These screw heads are covered by a piece of masking tape.

The tape is carefully removed, (May be able to use it again), and the two screws removed.

The Display Mask is very thin, therefore quite flexible.
The mask has plastic tabs that protrude from the outside edges.
There are matching tabs on the Display Cover.

(Display Cover: Plastic top cover of the laptop. Covers the LCD screen)

The Display Mask tabs snap into the Display Cover.

Go to either the Left side, or Right side of the Display Mask.
Go to the inside middle edge.
Halfway between the top and bottom of the Display Mask, and to the inside edge against the LCD screen.

Use a soft cloth laid on the LCD screen to protect it, and use a finger to gently start lifting on the middle/inside edge of the Display Mask.
(Cloth is to protect LCD screen from your fingernail)

With the Display Mask lifted in the middle, the width of a fingertip, ease another finger beside it. Start moving away from the first finger, and lifting up on the Display Mask.

The tabs of the Display Mask will start 'popping' out of the Display Cover.
Go around to the top of the Display Mask, and head towards the opposite side.

Once the Display Mask is halfway popped loose, the rest of the mask should come free.
Note that you have to slide the mask over to the Left, to clear the Latch, when removing the mask.

You will now see the screen Inverter,mounted to an area at the bottom of the LCD screen.

Unplug the cables from the Left, and Right side of the screen Inverter.
Note that the connectors on the cables are different, and can't be mixed up, as to where they plug in.

Remove the single Philips head screw from the bottom/middle of the screen Inverter.

Test the screen Inverter before removing;
This requires a sensitive (Read fairly expensive) multimeter,

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

Due to;
A) Low Cost,
B) Ease of access,
C) No tool available to test,
D) 90 percent of the time the fault is the Inverter,
the screen Inverter is usually replaced by the consumer.

Backlight:

If the screen Inverter proves to Not be the problem;

http://www.pelltechnology.com/Toshiba/Laptop/Toshiba-Portables-Qosmio-E15-Series/AV101/Toshiba-Qosmio-E15-AV101-CCFL-Backlight-Bulb-for-LCD.html

Replacing is a procedure that is fairly intensive, even for an experienced tech.

Why?
The LCD screen (Toshiba = LCD Module) is composed of many layers.
These layers are set in a specific pattern by the factory.

The layers are held in place by a Screen Frame. A thin metal frame that resembles a picture frame. (Toshiba = P-Chassis )

Part of the screen frame is removed. The screen frame Bezel.
(P-Chassis Bezel)

[ The P-Chassis, or screen frame, is composed of TWO parts. The lower main half which is the P-Chassis, and a thin upper half which is the screen frame Bezel, or P-Chassis Bezel.

This will all make more sense when you view it in the Service Manual, on Page 281 ]

Anti-Static computer gloves are usually worn to prevent soiling the LCD Panel, (LCD screen)
(Soiling = Oil from your fingers, dirt, and also helps prevent scratching the LCD screen )

There is a panel, or Board, that goes across the top. Three screws are removed. Then open the bent portion of the TCP of the board, and remove the Backlight.

The Display Assembly needs to be removed from the laptop, in order to perform replacing the Backlight lamp. (Bulb)

General example,

http://www.ccfldirect.com/lcdtutorial.html


Another one,

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

Service Manual link to be included in a Comment, along with more pictorial information.

Regards,
joecoolvette

Feb 25, 2012 | Toshiba PC Laptops

1 Answer

Toshiba Qosmio X305-Q705 Laptop screen yellow


It is not a driver or video card problem. It is the monitor.

To be sure plug a full size desktop monitor into your laptops monitor jack. Every laptop has one. If the picture doesn't turn yellow that will confirm that your LCD is bad.


Aug 16, 2009 | Toshiba QOSMIO F15-AV201 Notebook

1 Answer

Toshiba qosmio f15-av201 audio problem


install your original sound driver. remove conflict drivers.

Jun 01, 2009 | Toshiba QOSMIO F15-AV201 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

I replaced the inverter on my qosmio f25 laptop but the screen is still black. A blog relating to an IBM laptop says the ID in the inverter EEPROM needs to be updated. Is this accurate for Toshiba and how...


There is no EEPROM in the inverter, the inverter is a power device that supplies high voltage to the CCFL lamp.
If power supply to the inverter is OK and the inverter is OK then the problem is a faulty CCFL lamp.
Check LCD Parts for replacement lamps, cost approx. $10
use this link

www.lcdpart.com

May 17, 2009 | Toshiba Qosmio F25-AV205 Notebook

2 Answers

Toshiba G35-AV600 after Vista is instaled backlight not working


Sounds like the LCD back-lighting if off / disabled.
Suggest you vist Tosh website and download Vista display drivers.

Mar 21, 2009 | Toshiba Qosmio G35-AV600 Notebook

1 Answer

I have qosmio toshiba f15 lcd light is very weak ( dim ) but LCD & Inverter is oK


You can adjust the contrast and brightness using the utility in the lower right corner of your screen or via the display properties window. Right click on your desktop then click properties.

Jul 27, 2008 | PC Laptops

1 Answer

VGA card for Qosmio F15


Yeah, laptops don't have a seperate video card like a desktop.But it may not be the vidieo chip.It might just be an inverter problem,which is relatively simple and inexpensive.I can't be sure unless I see it . shops are notorius for trying to sell people new motherboards.Get a second opinion.

Feb 10, 2008 | Toshiba QOSMIO F15-AV201 Notebook

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