Mike wrote:

I have a Hitachi colour tv which is 20+ years old, it is not a "warm
up" tv, it usually switches on immediately.

Just recently, when switching it on it has a very thin horizontal line,
the rest of the screen remaining black.

After leaving it on for about 10 minutes the whole picture immediately
reappears. Sound is unaffected.

Would anyone have any ideas as to what might be wrong...?

vertical output section
check for solder joint cracks
around the vertical section.
also, spraying component cooler
on said components after which
the TV has started to work may
help in finding a bad semiconductor.


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