Need help identifying these smds for repair

[zeeawk]

This board is out of a retron 5 game console.
Two of the smds look like they got a bit toasty.

I think the first three letters/numbers on this one are: CU5 ?
https://drive.google.com/open?id=0B4LmKz1_fz3zeEdFWERfZ0VXOEp2SWc0dW1MZkVVOHd6UDdB
https://drive.google.com/open?id=0B4LmKz1_fz3zVC1YN0lPOWJ2UUJYdEl0N1hzZ3B2M3NFbm5v

This higher res image I found on the web is the same board but I *think* they must have changed parts on it or mine.
You can clearly see the numbers on them: C041FB and CU40B
I'm not sure if those are zeros or letter Os.
https://drive.google.com/open?id=0B4LmKz1_fz3zSHJNMkNSckl6Sjg


Any help is appreciated.
Thanks,
 William

[bktemp]

I couldn't find any part number using those marking codes, but from the location near the inductor it is clearly a synchonous stepdown regulator.

[zeeawk]

Ya I tried several sites searching for them also and couldn't come up with anything.

The connectors on the right side of the board in the last picture from top to bottom are:
5v dc power plug, micro usb, reset switch, HDMI, sd card slot.

[amyk]

CUxxx = SY8009B
COxxx = SY6280

[zeeawk]

awesome I think this is just what i need!
Looks like I have to get these from China but that gives me time to finish setting up my work bench.
replacing these are going to be "interesting". I guess next step is to figure out if anything else
is wrong that caused them to blow. I'm hoping someone just plugged in the wrong power supply.