I have a Christmas village decoration and the plug in box makes a high pitched squealing in time with the lights whenever it is switched on... am I able to remove a piece to stop it? If so, which piece?
It does not look like a SMPS so I would guess the transformer is vibrating due to the load.
You could try taking the yellow tape off and spray or brush shellac on it.
If you place a finger on the top of it can you feel any vibrations?
M..
Your welcome.
Check to see if the transformer is made up of steel laminations, if so it is a linear supply, also the primary connections appear to be fed right off the AC.
M.