@dangoc
Fuse FU691 and FU 692 are both on the DC/DC pcb.
[image|3274638]
Click on image
UPDATE:
@dangoc
Maybe you're looking for the wrong type of fuse as these are smd fuses, so they're very small
Here's a [link|https://uscamera.com/product/canon-eos-powershot-type-p-smd-fuses-vd7-2243-001/|link] that has an ''enlarged'' image of what they look like.
Here's an image from the manual showing where the DC/DC pcb is located in the camera and also an enlarged view of the DC/DC pcb showing where the fuses are and what their Canon part number is.
Use an Ohmmeter to make sure that the fuses test 0.00 Ohm i.e. a short circuit, as this means that they're OK.
If a fuse is faulty then search online for the part number to find suppliers.
[image|3275331]
(click on image)