Super Famicom Troubleshooting Guide: Difference between revisions
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* Never use excessive force on cartridge or controller ports. | * Never use excessive force on cartridge or controller ports. | ||
* For persistent issues, consult detailed schematics and consider professional repair. | * For persistent issues, consult detailed schematics and consider professional repair. | ||
== ⚠️ Clean the cartridge slot first == | |||
A dirty or corroded cartridge slot is the '''most common cause of a non-booting Super Famicom''' and of many "bad video" faults — far more often than a failed chip. Symptoms include no boot, a black or garbage screen, or a game that starts only when the cartridge is wiggled. '''Clean the cartridge slot and the cartridge edge contacts thoroughly''' with isopropyl alcohol before suspecting any IC. The slot is not soldered to the board (unlike the Mega Drive), so after removing the RF shield it can be pulled off and swapped to a known-good unit to test.<ref name="sfc">[https://forums.nesdev.org/viewtopic.php?t=13406 SNES/SFC repair/diagnosis logs], NESdev; [https://retroregen.com/repair-guide/super-nintendo-troubleshooting-guide/ Retro Regen]; and [https://www.leadedsolder.com/2018/04/23/super-famicom-repair.html Super Famicom Repair-O-Rama], Leaded Solder. Source for the dirty-cartridge-slot no-boot fault, the removable slot, the APU cause of black-screen-no-boot, the PPU video artifacts (incl. Mode 7), and the CPU/PPU/APU failure statistics.</ref> | |||
== Black screen with no sound == | |||
An SFC that powers on but shows a black screen with '''no audio and no video''' is often an '''audio-subsystem (APU / S-SMP) fault''', not a video fault — the audio hardware takes part in start-up, so an APU failure can halt the boot. Several unrelated faults look identical here, so work methodically: clean the slot, try a known-good cartridge, then probe reset and the clocks.<ref name="sfc">[https://forums.nesdev.org/viewtopic.php?t=13406 SNES/SFC repair/diagnosis logs], NESdev; [https://retroregen.com/repair-guide/super-nintendo-troubleshooting-guide/ Retro Regen]; and [https://www.leadedsolder.com/2018/04/23/super-famicom-repair.html Super Famicom Repair-O-Rama], Leaded Solder. Source for the dirty-cartridge-slot no-boot fault, the removable slot, the APU cause of black-screen-no-boot, the PPU video artifacts (incl. Mode 7), and the CPU/PPU/APU failure statistics.</ref> | |||
== Video artifacts == | |||
Checkerboarding, flickering or missing sprites, wrong or missing colours, and rolling video point to the '''PPU''' (PPU1/PPU2). Some failing PPUs work in most games but corrupt '''Mode 7''' effects specifically, so test a Mode 7 title.<ref name="sfc">[https://forums.nesdev.org/viewtopic.php?t=13406 SNES/SFC repair/diagnosis logs], NESdev; [https://retroregen.com/repair-guide/super-nintendo-troubleshooting-guide/ Retro Regen]; and [https://www.leadedsolder.com/2018/04/23/super-famicom-repair.html Super Famicom Repair-O-Rama], Leaded Solder. Source for the dirty-cartridge-slot no-boot fault, the removable slot, the APU cause of black-screen-no-boot, the PPU video artifacts (incl. Mode 7), and the CPU/PPU/APU failure statistics.</ref> | |||
== Which chip? == | |||
Across documented SFC/SNES repairs the '''S-CPU is by far the most common failed chip''', followed by the PPU1 and PPU2, with the APU least common. Suspect the CPU first once the slot, power and clocks are known good.<ref name="sfc">[https://forums.nesdev.org/viewtopic.php?t=13406 SNES/SFC repair/diagnosis logs], NESdev; [https://retroregen.com/repair-guide/super-nintendo-troubleshooting-guide/ Retro Regen]; and [https://www.leadedsolder.com/2018/04/23/super-famicom-repair.html Super Famicom Repair-O-Rama], Leaded Solder. Source for the dirty-cartridge-slot no-boot fault, the removable slot, the APU cause of black-screen-no-boot, the PPU video artifacts (incl. Mode 7), and the CPU/PPU/APU failure statistics.</ref> | |||
== Power jack == | |||
The DC power jack is a common solder-fatigue/wear point; a machine that is intermittent or dead but responds to pressure on the power connector needs the jack reflowed or replaced.<ref name="sfc">[https://forums.nesdev.org/viewtopic.php?t=13406 SNES/SFC repair/diagnosis logs], NESdev; [https://retroregen.com/repair-guide/super-nintendo-troubleshooting-guide/ Retro Regen]; and [https://www.leadedsolder.com/2018/04/23/super-famicom-repair.html Super Famicom Repair-O-Rama], Leaded Solder. Source for the dirty-cartridge-slot no-boot fault, the removable slot, the APU cause of black-screen-no-boot, the PPU video artifacts (incl. Mode 7), and the CPU/PPU/APU failure statistics.</ref> | |||
== References == | |||
<references /> | |||
== Related Pages == | == Related Pages == | ||