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If you soldered it correctly - the chip should work fine. Does the PS2 play original games?
Sonds to me you need to activate the chip at the boot up. Read the instructions that came with the chip to help with that. Generally, with the Noe 2.2, you'll need to keep the power button depressed until the blue eject light comes on for PSX games - try that for booting GS also. The Neo 2.2 also responds to a double tap after boot - and a double tap to boot. try these different techniques. Timing is critical at this stage and after the swap.
The other problem is your GS - it should be version 1.3 to be of any true efectiveness so look into that.
Good luck.
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