I take it you've looked in the manual to the TV and found out what the default code is and tried that? (usually 0000 or 1111). The child might have just turned the child lock on - not changed the code. If you think the child might have inadvertantly entered a new random code, you could try unplugging the TV for 5 or 10 minutes. This can sometimes cause electrical items to revert to their default settings. If that fails, tell the child that they won't be able to watch *enter their favourite programme here* until they remember the code they entered! They might 'miraculously' remember it, you never know. If all these suggestions fail, then i don't know what else to suggest apart from contacting your local TV repair shop. A friend of mine locked himself out of his own TV once, and he's supposed to be an adult! Fortunately (for him), the code was still set as the default code which i found printed in his manual! He won't do it again, bless his cotton socks.