Neo Geo:General Troubleshooting: Difference between revisions
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(Created page with "== Testing Video == Turn on the Neo Geo with all game(s) removed. After a few seconds, it should boot to a blue grid. If you are able to see the grid, your video output is okay. == Testing Hardware == Flip DIP 1 to ON to enable test mode. See the Neo Geo:Test Mode page for more details. == Common Symptoms == === Garbled Graphics === Garbled graphics or sound issues can be caused by: *The cartridge being inserted upside down. Ensure that the arrow on the cartridge...") |
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*Dirty pins on the cartridge or connector. See the [[Cartridge Cleaning]] page. | *Dirty pins on the cartridge or connector. See the [[Cartridge Cleaning]] page. | ||
*The cart being too tight and not inserted all the way. This might happen if the cartridge and/or Neo Geo shell was painted, adding extra thickness. | *The cart being too tight and not inserted all the way. This might happen if the cartridge and/or Neo Geo shell was painted, adding extra thickness. | ||
*The motherboard being flexed by inserting a cartridge too hard, resulting in cracked traces near the cartridge interface. | |||
*Needing to reflow the NEO-GRZ chip. | *Needing to reflow the NEO-GRZ chip. | ||
=== Freezing on Green Screen === | === Freezing on Green Screen === | ||
Freezing on the green screen generally indicates a calendar error. Look for a leaking battery on the motherboard corroding nearby traces. Check the clock crystal next to the D4990 chip and try reflowing the pins and the capacitors near it. | Freezing on the green screen generally indicates a calendar error. Look for a leaking battery on the motherboard corroding nearby traces. Check the clock crystal next to the D4990 chip and try reflowing the pins and the capacitors near it. | ||
Revision as of 05:38, 30 November 2022
Testing Video
Turn on the Neo Geo with all game(s) removed. After a few seconds, it should boot to a blue grid. If you are able to see the grid, your video output is okay.
Testing Hardware
Flip DIP 1 to ON to enable test mode. See the Neo Geo:Test Mode page for more details.
Common Symptoms
Garbled Graphics
Garbled graphics or sound issues can be caused by:
- The cartridge being inserted upside down. Ensure that the arrow on the cartridge is oriented closest to arrow on the motherboard/shell.
- Dirty pins on the cartridge or connector. See the Cartridge Cleaning page.
- The cart being too tight and not inserted all the way. This might happen if the cartridge and/or Neo Geo shell was painted, adding extra thickness.
- The motherboard being flexed by inserting a cartridge too hard, resulting in cracked traces near the cartridge interface.
- Needing to reflow the NEO-GRZ chip.
Freezing on Green Screen
Freezing on the green screen generally indicates a calendar error. Look for a leaking battery on the motherboard corroding nearby traces. Check the clock crystal next to the D4990 chip and try reflowing the pins and the capacitors near it.