Editing Super Famicom Maintenance Guide (section)

== Common Failure Points ==

{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+'''Super Famicom Typical Faults'''
! Symptom !! Likely Cause !! Quick Test / Hint
|-
| No power / dead || Blown fuse (F1), failed 7805 regulator, bad power jack || Check fuse continuity; measure +5V at regulator
|-
| No video / black screen || Dirty cartridge slot, failed PPU, bad AV cable || Clean slot; try known-good game; test AV cable
|-
| Garbled graphics / sprites || Faulty VRAM, PPU1/PPU2 || Swap with donor chips (advanced)
|-
| No sound || Failed audio caps, S-SMP chip, mute transistor || Listen for faint hum; check C59/C60
|-
| Random resets || Bad capacitors, cracked solder joints, failing regulator || Inspect C67, C81; reflow regulator pins
|-
| Controller not detected || Dirty port, failed S-IC, broken traces || Test with known-good controller; inspect port solder
|}