Summary

Unknown consumer Sharp CRT chassis modified to have an integrated 2-chip SNES hooked up via S-Video. Came in two sizes, 20" and 13".

Literature

• Owner's Manual (JPN) - Special Thanks to Bruno Meyere for finding a physical copy and scanning it for us
• Service Manual (JPN Translation by Bruno Meyere) - this is for the 25C-BS300 which is the TV chassis the 21G-SF1 uses. The service manual covers everything inside the TV other than the microcontroller and the SNES interface.
• No exact service manual available. If you have access to the OEM service manual please send me a message via the contact page.

Notes

The sticker around the cartridge slot is only present on floor/display models. SF1s with this sticker should be avoided due to the nearly guaranteed high-hours usage unless you are really determined to have one for collectors' purposes.

The SNES part of the TV is removable for servicing. To remove it, take out the two screws securing it on either side of the top frame of the TV and then give it a really forceful vertical wiggle on either side to free up the plastic to slide out. The whole top assembly slides back out of the TV. The people on YouTube taking these apart without removing the top plastic from the TV first are doing it the hardest possible way...

The SNES itself is prone to leaking capacitors and part of the restoration process should be removing it for recapping. The 2 47uF and 220uF capacitors should be replaced. The larger 21G variant has a slightly different SNES board layout and will only have one 47uF cap instead of two.

The internal potentiometers are labeled in a gallery picture below.