Re: What words would you use to describe the sound made by an Apple IIe monitor when the IIe is turned off?

[larwe <zwsdotcom@gmail.com>]

On Jul 17, 3:38 am, SlickRCBD <slickrcbdn...@gmail.com> wrote:
> In the last two weeks sometimes I shut down my new Gateway computer my
> flatscreen Acer monitor starts making a VERY high pitched whine almost
> identical to what I recall the old Apple IIe color monitors made at
> school if you turned off the CPU before turning off the monitor.  The

Most likely a different reason. In the Apple case, once sync goes away
the h-sync starts to free-run and settles down to its natural/resonant
frequency. Which I would guess is lower than the normal 15kHz and
hence more audible.

In the case of an LCD monitor my guess would be that there's an
inductor in the SMPS that is cracked or loose, and the reason it's
noisier in standby mode is because the switching frequency is changing
when the supply is under-loaded.