Neo Geo AES

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Chip Info

Chip numbers (U1 - U39) are from schematics but PCBs are not typically marked.


Other possible chips (?):

Capacitor Lists

NEO-AES

Purchase these parts as a kit

NEO-AES Cap Map
Upper Left
10uF	16v
100uF	10v (recommended change to 470uF to improve video quality)
100uF	10v (recommended change to 470uF to improve video quality)
100uF	10v (recommended change to 470uF to improve video quality)
100uF	10v (recommended change to 470uF to improve video quality)
100uF	10v (recommended change to 470uF to improve video quality)
	
10uF	16v	
4.7uF	25v
1000uF	16v
		
Upper Right
4.7uF	25v
4.7uF	25v
4.7uF	25v
4.7uF	25v
10uf	16v
		
Lower Left
1uF	50v
4.7uF	25v
		
Headphone Control
220uF	10v
220uF	10v
1uf	50v
1uf	50v
22uf	10v
22uf	10v
22uf	10v
		
Add-on PCB PL24IT (not always present)
47uf	16v
1uF	50v


NEO-AES 3-3, 3-4

Purchase these parts as a kit

100uF	16v	7
10uF	16v	4
1uF	50v	4
2200uF	16v	1
220uF	16v	2
22uF	16v	3
4.7uF	25v	7
470uF	16v	1


NEO-AES 3-5

Purchase these parts as a kit

Value	 	Quantity
100uF	16v	1
10uF	16v	19
2200uF	16v	1
470uF	16v	7


NEO-AES 3-6

Purchase these parts as a kit

Near Reset Button
2200uF  6.3v    1
470uF   16v     1
10uF    16v     1

Below cart connector
10uF    16v     15
470uF   16v     2

By power jack
470uF	16v	5
10uF	16v	4
1uF	50v	3


Schematics

Big thanks to ArcadeTV and Klaus for scanning and releasing these!

Note: These are cleaned up & reduced size versions of the originally released PDF. I've removed the markings and split a few of these to save space.

ALPHA DENSHI CO., NEOGEO-2, Rev 1.5, October 4, 1991


Self-Diagnostic Codes

The AES has a simple built-in self test which is activated when powering the console on without a cartridge installed. [1]

Blue
All tests passed (The AES does not test the Z80 sound IC).
Red
Work RAM error ($100000 region).
Green
Palette RAM error ($400000 region).
Yellow
Video RAM error (programmed through custom port).
Pink
BIOS checksum error (0xC00000 region).
Cyan
Memory card error (only tested if card in unit and blank).

AES 3-3, 3-4 Audio Fix

Sources: [2] [3]

Revisions 3-3 and 3-4 are missing some caps in the audio section leading to poor quality sound:

  • 470uF bypass cap on the 2066D
    • (-) on pin 8, (+) on pin 9
  • 0.1uF or 10uF bypass cap for the DAC. Both included in our kits - the 3-6 uses a 10uF but this mod is also frequently performed using the 0.1uF.
    • (-) on pin 2, (+) on pin 1 (orientation not important if using 0.1uF ceramic)
  • 2x 1uF ceramic caps on headphone amp audio inputs
    • Connect 1 cap from pin 1 to GND, and other cap from pin 16 to GND
  • 4x 0.1uF ceramic caps on 4558 / 324 opamps
    • Across pins 4-8 on the 3x 4558
    • Across pins 8-9 on the 2066 headphone amp

Parts are available separately or bundled with our AES 3-3, 3-4 cap kit