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This is not an inverter problem. The inverter only powers the fluorescent lamps in the back of the LCD panel.
It is probably a fault in the LCD data decoder circuit or a failing connector between the decoder circuit board and the glass LCD panel. If you took it in to a shop, they would probably charge you a full hour's labor minimum - compare that with the price of a new LCD monitor.
Your back light is probably out - it may have a bad inverter. Shine a flashlight on the screen and see if you can detect any color or images. If so, then the back light is out. Inspect the inverter for any bulging capacitors. They must be flat on top - if they bulge at the top, then that capacitor is bad.
You don't need to remove the LCD display even if it is not working, provided the video card is OK to use the Toshiba without its display. Just connect a monitor to the video port on the Toshiba, then power up the monitot then boot up the Toshiba. The video data should automatically switch to the external monitor.
The Toshiba M3 laptop has an Intel Pentium M 2. 13 GHz processer and 512 MB (DDR2 SDRAM) of memory (although it can support up to 2048 MB). The 36cm XGA TFT LCD screen supports a maximum resolution of 1024 x 768. The internal hard drive can store 80 GB of data. The weight of the laptop is around 2300g and the Lithium ion battery lasts for around 3. 2 hours from a full charge. This laptop has a NVIDIA GeForce Go 6200 PCI Express graphics and has Headphones, Sound card and Speaker(s) audio outputs.