[greenTea]

Early CRT TV’s were not designed to accept wide deviation from the normal scan frequencies used by analogue TV. (ie: 15,625 Hz horizontal & 50 Hz vertical for PAL operation).

And using higher resolutions than that of standard definition (720x576) will require higher frequency scan rates. It may depend on the model of set, and how far out of the normal operating range you take it, but sending significantly higher scan rates to sets of this nature can place the analogue deflection circuits under great stress –to the point of causing instant failure in some cases, or failure after a period of use in others.

Some later model CRT sets were specifically designed to accommodate higher scan rates for high definition operation -just as CRT computer monitors can. But if a TV set only has a composite connection, (and not Component or HDMI) it’s usually a good sign that the set is not of a type that can comfortably accept significantly higher scan rates.

So it all depends on the type of CRT set you have, but if in doubt stick to standard SD operation –or something very close to it. Because if failure should occur, the cost of repairs could easily be greater than the value of the set, or the replacement parts may not even be readily available.


Hope this helps
Cheers