Black and white image on tv when using a composite AV cable
If you are using a composite video cable on a PAL games console in conjunction with an NTSC television you may experience a black and white picture. This can be resolved by using an RGB SCART cable if the computer/console outputs RGB. The region of the console needs to match the region of the television. For example, if you live in the United States and you have an NTSC console and an NTSC television set, then this cable will be compatible. If you live in Europe and you have a PAL console and a PAL television, then this cable will work. However, if you live in the United Kingdom and you have an imported NTSC console, then this cable will not work on a United Kingdom PAL television as you will get a black and white picture! Instead you will need an RGB SCART cable, which will allow cross region compatibility.
No video or sound on tv when using RGB SCART cable
Check that the SCART socket you have plugged the SCART cable into is an RGB enabled port (this is usually AV1 or EXT1) and that your not using a SCART switching box, which may not support RGB, only composite video. Also check that your television is switching into RGB mode correctly. Some TV sets display an 'RGB' message in the top right of the screen for a short duration when selected. This should be automatic when you turn on your console/ computer, however, if this does not occur you maybe able to manually select the RGB channel pressing the Mode/AV select button on your remote control until you hit the RGB channel. Also check that none of the pins are bent on the Audio/video plug and that all the SCART plug pins are straight.
Upon power up the tv switches to RGB mode, however, there is no video or sound
If you are using a ROM cartridge game used commonly with video games consoles, try using a varity of games to see whether the first game cartridge was faulty. Cleaning the copper contacts on the edge connector of a ROM cartridge game will often fix the cartridge. Metal oxidization of the copper contacts over time render the cartridges useless, however, in most cases cleaning the copper contacts with either an electronics cleaning solution or light cleaning with a high grade sand paper can clean the contacts. Do not clean the copper contacts with water and do not submerge the ROM cartridge in water. This can be done by lightly moving a small peice of the sandpaper up and down the copper contacts either side of ythe edge connector and using a dry paint brush the oxide build-up into a bin, in a brushing motion away from the electronics on the ROM cart.
Television shows vertical lines when using a Mega Drive/Genesis via RGB SCART cable
The common cause of the vertical lines occurs when using a regular "sync over composite video" RGB SCART cable. A composite sync or CSYNC RGB SCART cable will significantly reduce the vertical lines, however, you will loose the ability to transmit composite video, which isn't such a bad thing.
Television shows checker board effect when using a Super Nintendo via RGB SCART cable
When using a regular "sync over composite video" RGB SCART cable for the PAL SNES you may experience a checkerboard effect on solid colours, which can be resolved by using a "sync on luma" RGB SCART cable.
On screen image does not fit television screen
If the the top or bottom of the image appears to be obscured you just need to adjust the aspect ratio of the television using the remote control.