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I know of no wiring diagram other than the points to which the chip goes. We need to know more about the chip. Is it NEO2.2?
If so, there is a good chance that they've bridged the two legs on the BIOS chiup that take wires from pins 5 & 6 of the NEO2.2. They control the tray eject mechanism.
The symptoms are usually confirmed with a blinking blue light when you swicth on. What lights are on when you power up the PS2?
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