Question about Toshiba Satellite Computers & Internet
The Toshiba Satellite M305-S4907 Notebook PC, uses a single CCFL for a Backlight.
Primer before we go on;
An LCD screen cannot produce light. It needs an additional light source,
Click on the monitor image.
The additional light source is a Backlight.
A Backlight can be a CCFL, (Or two of them), or a series of LED's.
(Light Emitting Diode)
A CCFL is a 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.
View the last 8 photos.
A screen Inverter is used on laptops that use CCFL for Backlighting.
A screen Inverter converts the power (Electricity), from the laptop, for the LCD screen, and Backlight.
Laptops that use a series of LED's for backlighting, do Not use a screen Inverter.
90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter.
The plastic thin frame in front of the LCD screen, is the Display Bezel. (Toshiba = LCD Bezel)
The screen Inverter is located behind the Display Bezel, and mounted at the bottom of the LCD screen.
(LCD Screen Frame, actually)
Easy to get to; easy to replace.
How to test a screen Inverter? Requires a Sensitive multimeter.
Read fairly expensive,
Because of this; and the low cost, plus ease of replacing; most home users just opt to replace it.
Fluorescent lamps have MERCURY inside. HIGHLY poisonous.
Now couple that with the long thin makeup of the CCFL, and how easy it is to break it.
This is why if the screen Inverter is found to NOT be the problem; I would suggest replacing the LCD screen itself; instead of trying to replace the CCFL, and cause possible Mercury poisoning.
For additional questions please post in a Comment.
Posted on Dec 12, 2012
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Posted on Jan 02, 2017
The problem is the inverter cable or the inverter itself.
If you have any warranty left on the laptop then i recommend you take advantage of that and send it in for repair, or you can deal with this 2 ways.
Fix the problem yourself.
Remove the screen bezel (plastic screen surround), this will reveal the whole screen. At the bottom of the screen you will see an elongated piece of circuit board with wires coming from either end covered by frosted plastic.
That is the inverter, check the connections on the inverter and power the laptop up to check the display, to remove it gently pull the plugs from each end and remove the screw from the middle and pull the board away.
Look at the inverter for a copper coil, if you re-solder the solder points around the coil you may find it works again as components that suffer from extreme heat the solder joints dry causing bad connections, re-floating the solder solves the problem in 90% of cases.
Take the laptop for repair.
In this case all you have to do is source a reputable PC repair store and take it in for them to fix. (it should be fairly inexpensive).
Posted on Sep 02, 2009
Remove the power strip above the keyboard and the keyboard and remove the bezel on the LCD. This will give you a clear view of the wiring leading from the screen to the motherboard. Look for a loose connection or rubbed or frayed wiring. Also, a lot of video problems are from the cable getting loose that runs from the back of the screen. This is a flat cable the fits in a socket on the back of the screen.
Here is the lcd removal duide for your laptop....
Posted on Sep 22, 2009
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