So I drilled and chamfered a 10mm hole in the 0,5mm thick plastic rear cover (and covered with sellotape to keep out dus) so I had finger access to the capacitive disc area and everything worked. Do you have a light box or light table in your classroom These are great for sensory learning and the great thing is that you dont have to spend a ton of. You can also remove the back to make tracing easy.

The tablet has LEDs built into the frame to make the gel glow and illuminate your kids' art. This light board drawing tablet comes with Gel FX Markers to sketch with. I found just touching the front or the rear of the circuit board, by the capacitive disc, with my finger (its only 5v so quite safe) showed every working. Bring out the little Picasso in your kids with the Crayola Ultimate Light Board. All to turn of/on and do dimming/brightening. comzler Light Board, A4 Tracing Light Box, Magnetic Light Pad, Light Table for Tracing, LED Light Drawing Board, Sketch Pad LED Light Drawing Pad, Cricut Light Pad, Dimmable Brightness. The board had a capacitive disc for switching, unmarked IC, A09T transistor, a few capacitors and resistors. All looked fine and there was 5v on the circuit board from the USB supply, as expected. The ultra-thin tablet design and bright LED drawing surface make. I pealed off the back which was held on with double sided adhesive tape to expose the tiny circuit board with its string of 21 LED’s. The Light-Up Tracing Pad enables kids aged 3+ to trace and colour detailed scenes with ease. My Savfy A4 LED lightbox (model A4-DWT) stopped turning on after about 2yrs.

Light up tracing table