ReadyNAS DUO RND2000 Burnt Transistor

Can any readynas duo user show a close up picture of that chip so that I can identify a direct replacement.
or tell me the engraving on the Q2 chip would be nice.
Appreciate ur help.

I can't help you with the part. I will warn you, though, that that type of catastrophic problem with a transistor is rarely caused by the transistor itself. It appears that whatever is attached to it was drawing too much current, quite possibly a direct short. So I urge you to do a little more troubleshooting before you replace, or at least buy two parts.

Loy wrote:
Hi, I just got my ReadyNAS DUO with a burning smell. After opening up the casing, I found a burnt transistor. Marking 749. It showed Q2 on the Main PCB board. Can anyone advise what chip is it so that I can get it replaced. Although it can still boots up and runs fine, although slower. But My fan isn't working currently. Help is greatly appreciated.

Loy: I'll PM over some contact details so you can get in touch with me.

Sandshark wrote:
I will warn you, though, that that type of catastrophic problem with a transistor is rarely caused by the transistor itself. It appears that whatever is attached to it was drawing too much current, quite possibly a direct short. So I urge you to do a little more troubleshooting before you replace, or at least buy two parts.

Couldn't agree more. No guarantees that replacing the part won't just lead to the same issue, or worse, more significant damage. Finding the cause of the problem is better than blindly replacing parts.

Hi SandShark and siigna,

Thanks for your advise.
I agree.

From my debug, the transistor is supplying the fan power.
I managed to find the replacement part.
Fairchild fzt749.
Cheap replacement.

But why the fan is drawing so much current causing the transistor to burn is the problem.

Something must have gone wrong requesting the fan to spin faster to cool the system but probably this fan sucked more than the transistor spec of 3A.

Is there some similar cases u heard of?