Start by identifying the symptom

Before ordering a part, separate the symptom from the cause. For a power-on problem, the troubleshooting page consulted mentions the power cable and a disconnected POWER switch, among other possibilities. Check these first rather than immediately replacing the switch.

POWER: check the control and its connection

Before any internal inspection, turn off the console and unplug its power supply. Checking the connector requires opening the console appropriately for that revision; leave it to a repairer if you are unfamiliar with the work.

The Super Nintendo POWER control is described as a latching slider. Technical documentation places it in series with the 7805 regulator and a Schottky diode. This arrangement lets you distinguish the slider’s mechanical action, connection and switch before selecting a replacement part.

• If the console will not turn on, start by investigating the power cable.
• If the external control moves but the problem persists, inspect the POWER connection and its link to the board.
• Do not diagnose a faulty switch from the external symptom alone.

The iFixit repair guide places the POWER connector near the motherboard’s upper-left corner and recommends removing the connector without pulling its wires. This identifies an inspection point before possible replacement; it does not by itself prove the switch is faulty.

RESET: inspect how the action reaches the switch

RESET on the original SNES is a momentary control that returns when released and connects to the VCC/CIC circuit. Its behaviour and wiring therefore differ from POWER.

If RESET moves but does not reset the game, an iFixit community answer suggests inspecting for a worn or damaged spring, an internal plastic mechanism no longer pressing the switch correctly, or a faulty internal switch.

When should you consider replacement?

For a power-on problem, iFixit’s troubleshooting page treats replacement as a last resort after cable and POWER-connection checks. This recommendation concerns the power problem documented on that page; it cannot automatically be extended to RESET.

The iFixit POWER guide explains handling the connector but does not provide a complete electrical diagnostic procedure. The sources collected here also do not provide universal measurement values for different SNES revisions. If these checks do not identify the cause, the next step is to have an equipped repairer examine the control and its circuit rather than installing a part on an assumption.

Key points

• For POWER, first examine the power cable and switch connection.
• Handle the POWER connector without pulling its wires.
• For RESET, the spring, plastic mechanism and internal switch are leads reported in one individual community answer.
• The cited troubleshooting documentation concerns the original SNS-001 type 1 SNES, not every regional or hardware variant.
• The cited sources establish no universal multimeter value or cross-revision part compatibility.