NES Controller Button Tester LED Diagnostic Tool

Quickly test original Nintendo Entertainment System controllers with this purpose-built NES Controller Button Tester.

Designed for game stores, repair technicians, collectors, and retro gaming enthusiasts, the tester provides an immediate visual indication of each controller input. Simply plug in an NES controller (and 5v micro USB power) and press the buttonsindividual LEDs illuminate in real time so you can quickly identify working, intermittent, or unresponsive buttons.

Features

• Tests all 8 NES controller inputs

• A
• B
• Start
• Select
• Up
• Down
• Left
• Right
• Individual LED indicators Each button has its own red LED that illuminates while the corresponding controller button is pressed.
• Great for sensitivity testing Repeatedly press or hold a button to help identify dirty contacts, worn membranes, intermittent inputs, or buttons that require excessive pressure.
• PASS indicator The tester remembers which inputs have been detected during the test. Once all eight buttons have registered successfully, the green PASS indicator illuminates.
• Reset button Instantly clears the completed test and prepares the unit for the next controller.
• Audible feedback An internal piezo provides audio feedback when controller inputs are detected.
• Built-in Easter egg Enter the classic Konami Code for a hidden audio surprise.
• Custom controller-inspired enclosure 3D Printed + Laser-cut acrylic construction with UV-printed graphics gives the tester a distinctive retro appearance.
• No console required Test NES controllers directly without connecting them to an NES or launching a game.

How It Works

1. Connect your NES controller to the tester.
2. Press each controller button and D-pad direction.
3. Watch the corresponding red LED for immediate input feedback.
4. Repeat presses as needed to check button sensitivity and consistency.
5. Once all eight inputs have been successfully detected, the green PASS indicator illuminates.
6. Press RESET to clear the test before connecting the next controller.

Because the individual LEDs respond to the controllers live input, they can also help diagnose intermittent buttons. If an LED flickers, fails to illuminate consistently, or only responds with excessive pressure, the controller may require cleaning or repair.

Ideal For

• Retro game stores
• Video game repair shops
• Console technicians
• NES collectors
• Controller refurbishing
• Flea market and convention testing
• Quickly testing used controllers before resale

Compatibility

Designed for standard Nintendo Entertainment System (NES) controllers using the original 7-pin NES controller connector.

Compatibility with unusual third-party controllers, specialty accessories, and devices that use the NES connector but require additional hardware or communication protocols is not guaranteed.

Included

• 1 NES Controller Button Tester
• 1x Micro USB to USB A Cord

Requires 5v USB power supply

Designed and constructed by Retro North Games

NES controller not included.