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My Commodore 64 shows a black screen when I turn it on
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Black Screen Troubleshooting
A black screen on power-up is one of the most common issues. Let us diagnose the problem.
Diagnostic Steps
| Check | What to Look For | Likely Cause |
|---|---|---|
| Power LED | Is the red light on? | If no light: Power supply failure |
| TV Channel | Correct channel (3 or 4)? | Wrong channel selected on TV |
| RF Connection | Cable firmly connected? | Loose modulator cable |
| Cartridge Port | Anything inserted? | Dirty or faulty cartridge |
If the LED is ON but Screen is Black
- Remove all cartridges and peripherals
- Disconnect disk drives and datasette
- Try a different TV or monitor
- Check the RF modulator connection
- Clean the cartridge port with isopropyl alcohol
Common Hardware Failures
- PLA Chip: Most common failure, causes black screen
- RAM Chips: Can cause various screen issues
- VIC-II Chip: No video output
Warning: The original C64 power supply (the "brick") is known to fail and output excessive voltage, which can damage your computer. Consider replacing with a modern power supply.