Retron 5 comonent ID request

Nismax

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I picked up a Retron 5 from the thrift and apparently some asshat tried to use a higher-voltage power supply with it because I got it home and did not power on with the required 5v, aside from a random flicker of the power LED. I cracked it open and noticed the component circled in red in the attached image, was fried. I could not make out the markings on it, and this is the best image I could find online, still tough to make out. I assume it is a voltage regulator? If anyone has one on hand and can ID the chip so that I can find a replacement, it would be much appreciated. Thanks for any help.
 

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Butane_Murphy

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I dug out an old microscope to look at the burned on on my board ... I can make out "CU4", then either "CA", "GA", "OA", or "QA" ... not sure which. It looks like they may have used some strange components with this board ... I was able to identify one of the other voltage chips as a "C03GA", which doesn't appear to be common ...

Update: I think it might be a buck IC, and the only thing I can find in the chinese space is a CU4OF (6-pin buck IC IJ9CH Ah4GA IDP=K06 CU4OF 0B=V0B DK=W09 XT7FB). I can't seem to find a spec sheet on it or the IJ9CH. I'll keep looking ...

Update: Apparently you only need to know the first two (CU) characters. The last three are a date code. So, the actual component model is SY8009.
 
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