My Sanyo CP21SA1 TV is showing only a white screen. I can hear the audio fine,
but can't see a picture and can't change the channels using the remote or
manually. What is happening!?

I have seen other people on forums on the Internet with a similar problem and
it seems relatively easy to fix, but in their case the TV switches off after
a few seconds. Mine doesn't, it just stays white until I switch it off. Does
that mean it is something else?

Can I fix this? I don't have much electronics experience, and have never
fixed any TV, so some basic instructions would be good.

I would be so grateful for any help anyone can offer.

Thanks in advance