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Atai 520 STE with 2 bombs on statup !


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Hi,

I just get a 520 STE in a poor condition. After cleaning and replacing PSU (the one that came with the ST was faulty), I tryed to start it up !

The screen appears, flashing, and after 10s, 2 bombs appear. I've read that this is "BUS error" !

I test many RAM swap (with some I had that I know are OK), same thing.

I've cleaned the PLCC/chips with deoxit ... same thing.

 

It's my first ST, I don't have any background with this machine, so if someone could give me some hints ...

 

Thank you in advance for your advices.

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