Startech - 12 V Sata HDD Docking stopped working - Need help to identify an IC

[samstown]

Hello folks,

One day my Startech HDD SATA docking stopped working, instead of buying a new one I want to repair it. I've measure PCB and I think U10 is a mosfet and the culprit but I don't know what chip to order to repalce it.


Thanks
Sam

[kasfamily]

Hi, check out U7

[samstown]

Thank you. U7 is the one on the 3rd pics (see voltage in red) , it has 12 V in and 10 V Out, that doesn't sound right ? it should be 5 V only ? I can try to inject 5 V at output and see if that work. Thanks.

[samstown]

Ok I've tried to inject 5V at U7 output, it doesnt help.

[kasfamily]

U10 does not look like a mosfet, wipe it with alcohol, at least part of the name may appear

[samstown]

I've cleaned it with Isoproply alcool and tried to look with microscope and smartphone zoom with different light and angle.. I see nothing at all. what chip could taken the input from power button to pass power to start ?

[kasfamily]

Still, once again a photo of U10 and foto this part number

[samstown]

thank you for your time and help. I've tried searching online but couldn't find anything.

[kasfamily]

Do these two have visible names?

[прямо]

You need to remove U7. It is faulty. 78L05 is a fixed 5V regulator and it shouldn't be outputting 10V. It's most likely the reason why that 8 pins IC (whatever it was) blew up because it was supplied with 10V instead of 5V.

And 78L05 has to be removed before you can inject 5V, although at this point it is pointless to inject voltage. You won't be able to fix this device until that blown IC is identified.

[samstown]

Thank you. I've remove it now and I removed U10 as well.I've tried to find any marks on it but there's no way. I'll give up on this repair. Thank you all for your help.

[прямо]

The photos you shared have a very bad image quality. Did you use a camera phone from 20 years ago???

If we could see everything clearly it may be possible to guess what IC it is, what it does and to bypass it entirely.