Zeroeth level pc monitor repair

The only excuse I have is i don't normally look at the innards of pc
monitors.
I now have a recent monitor where the biasing of driver for pulse
transformer leading to base of the LOPT driver , correctly biased, seem
fine but no line rate oscillator, HT etc.
With pc monitors is there no free running oscillator that is then pulled
into sync by external H & V syncs from the pc ?
Is it the case of no external syncs then no monitor oscillator at any
frequency?

Perhaps I'm too cautious but the 3 R,G,B signal lines from the pc go direct
to the subboard fixed to the CRT neck socket close by to spark gaps and HV
components - alien territory to me to see TTL level suff there.
I therefore powered up a win95 era pc , known working (with its monitor ) ,
15 pin high density plug format, to feed syncs + RGB to this one but it does
not kick into life.
Chase the H sync signal lines back to what should be their source on the pc
to monitor lead and there is none.
Does a recent pc monitor with DDC control lines need a more recent pc ?
Is it safe to power up pc with old monitor , unplug that monitor and plug in
new monitor or is it some control line I have to enable/disable ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/




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