DaytimeDreamer
Southern Pounce.,
- Joined
- Jul 22, 2005
- Posts
- 747
I opened up a thread regarding the Neo Geo AES 3-3 board revision here but thought to start a new thread since MKL's thread about fixing the audio issues has no images anymore so this new thread will serve as a information / advice thread and pic repository with before and after pics once the mods get done.
Here is the stock AES 3-4 board
Question to Xian Xi since he provided most of the information on the 3-3 board which looks pretty much identical to this one:
Do the same 3-3 mods apply for the 3-4 board? Here is a list of the 3-3 mods Xian stated:
- To fix the audio, you just need to add a cap to the headphone amp and add bypass caps on the 4558s. For the headphone amp, 470uf/220uf and got bypass caps they are always 0.1uf. (for the bypass you can use ceramic dipped) All caps would be connected between power and ground. + to vcc and - to vdd.
- To fix the weak rgb, you can try altering the voltage divider on the rgb lines. You'll see 6.8k tied to iirc 2.2k resistors. Remove the 2.2ks and replace them with 2.6-2.8k resistors. Voltage at least 6.3v, (10v is a good choice)
Any input/help on the above appreciated.
Here is the stock AES 3-4 board
Question to Xian Xi since he provided most of the information on the 3-3 board which looks pretty much identical to this one:
Do the same 3-3 mods apply for the 3-4 board? Here is a list of the 3-3 mods Xian stated:
- To fix the audio, you just need to add a cap to the headphone amp and add bypass caps on the 4558s. For the headphone amp, 470uf/220uf and got bypass caps they are always 0.1uf. (for the bypass you can use ceramic dipped) All caps would be connected between power and ground. + to vcc and - to vdd.
- To fix the weak rgb, you can try altering the voltage divider on the rgb lines. You'll see 6.8k tied to iirc 2.2k resistors. Remove the 2.2ks and replace them with 2.6-2.8k resistors. Voltage at least 6.3v, (10v is a good choice)
Any input/help on the above appreciated.
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