Neo Geo AES

For more information, see this article's corresponding Wikipedia page: Neo Geo.

This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables

This device is in the WorkNeeded:ReplacementParts category because it was flagged as missing information on replacement parts. If it has the original parts listed you may be able to search for replacements using the parametric searches available from parts distributors. If you have or make a list of replacement parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables

Preliminary Information
Leak Risk	Medium
Batteries	None
Mounting Technology	Mostly TH, some SMD
Capacitor Types	Aluminium electrolytic, ceramic
Destructive Entry	No
Hardware Specifications
CPU	68000
Display Interface	15kHz RGB and composite
Power Requirements
Input Voltage	5V DC or 9V DC, depending on model
Power Connector	Barrel jack 5.5x2.1mm, centre negative

Note that there are two versions of the AES, as well as several motherboard revisions. The basic types are 5V and 9V. The 5V models require a centre positive 5V supply, and while they have over-voltage protection can still be damaged. The 9V versions require a centre positive 9V supply, and have an internal regulator that generates 5V. Most (all?) motherboards can be either type, can be changed over by removing and adding components.

Diagnostic BIOS original version: https://smkdan.eludevisibility.org/neo/diag/

Diagnostic BIOS updated fork: https://github.com/jwestfall69/neogeo-diag-bios

Note that both require a cartridge to be inserted to work.

Known Issues

Graphical glitches

Causes

• Low voltage on power rails.

Solutions

• Damaged power supply.
• 5V over-voltage protection circuit failure (5V models).
• Damaged switch mode regulator (9V models).

Solid colour screen

Causes

• BIOS checks failed at power on.

Solutions

• Blue screen - all checks OK, cartridge not inserted/faulty.
• Red screen - work RAM error.
• Green screen - palette RAM error.
• Yellow screen - video RAM error.
• Magenta screen - BIOS self check error (i.e. checksum).
• Cyan screen - memory card error.

RAM types and locations: https://wiki.neogeodev.org/index.php?title=RAM_chip

Disassembly Notes

Some screws are under the stick-on feet. The screws holding the memory slot in need to be removed to lift the motherboard out.

AES3-5 schematic (reproduction): https://github.com/Board-Folk/NeoGeoAES-3.5

Some original schematics: https://wiki.neogeodev.org/index.php?title=Schematics

Original Parts

NEO-AES3-4 Motherboard

Capacitor Specifications and Footprint Information

RefDes	Qty	Capacitance	Voltage	Mount	Diameter/Size	Height	Lead Spacing	Temp	Type	Brand	Series
	1	2200 µF	16V	TH	16mm	16mm	7.5mm	0 °C	Electrolytic	TK
	1	470 µF	16V	TH	16mm				Electrolytic
	2	220 µF	10V	TH	16mm				Electrolytic
	7	100 µF	10V	TH	7mm				Electrolytic
	1	47 µF	16V	TH	5mm		2.54mm		Electrolytic
	3	22 µF	10V	TH	5mm		2.54mm		Electrolytic
	5	10 µF	16V	TH	5mm		2.54mm		Electrolytic
	7	4.7 µF	16V	TH	5mm		2.54mm		Electrolytic
	4	1 µF	50V	TH	5mm		2.54mm		Electrolytic

Replacement Parts

NEO-AES3-4 Motherboard

Capacitors

RefDes	Qty	Compatible Part Number	Order Links
	5	470µF 10v, sized to fit near video port. Larger caps will not fit. These replace the 100uF caps for improved video quality. Nichicon UVZ1A471MED1TD or Panasonic ECA0JM471	Mouser
	1	Correct size replacement. Cannot be too tall or case will not close. Nichicon URS1C222MHD	MouserDigikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.