WD2500JB PATA, fried SMOOTH L6283 1.3

[flashcoder]

Hi!
Got my hands on a dead WD2500JB PATA drive, its obvious that the spindle controller SMOOTH L6283 1.3 has died in horrible death.
Question is - why? I dont know the history of this drive, received it inside a computer which I bought on cheap sale.
I checked the big diodes in power circuity - those seem fine. But the Q8 component also is dead, its even visible a bit. And I dont know the part code since the surface is damaged.
Anyone knows whats the Q8 is? What you would suggest to check as well?
And is there anyone who knows where (or could himself) sell me the SMOOTH L6283 1.3? I will replace it no problem, got access to SMD rework heat gun.

Thanks!

[coolday]

I have a wd 40 gb h.d.d which had a burnt smooth ic. I have replaced it with the exact chip but there is no motor spin up.

I have made a separate post but I didn't get any reply as of now

western-digital-looks-dead-t16229.html

[jono-ats]

The PCB itself is also damaged in this case. Trying to fix the PCB (vs. replacement) is a bad idea.

To the 2nd poster, if the drive still doesn't work after IC replacement:

1. You have not identified all of the failed parts;
2. You did not do the "surgery" correctly;
3. There is a motor problem (very unlikely)

[granaryloaf]

The SMOOTH chip can be found on all sorts of drives and PCBs that will sell for pennies on online auction sites, Googling the p/n may be worth a try.

Not 100% sure about the Q8 but it looks like a voltage regulator to me. You could find the values on a similar drive.

The simplest repair will ignore the SMOOTH chip (as the whole area looks a mess) and the Q8 and transplant the ROM to a similar PCB. After doing this you may well find that the heads have been damaged too, this happens ocassionally.

The cause can be a number of things but I would disregard over-voltage as a possibility even if the TVS Diodes were popped.

[fzabkar]

Q8 appears to be a MOSFET, possibly a 12V switch (?).

[ccc]

No
Q8 is part of the 3.3V regulator together with the SMOOTH chip.
Rgds

[Damon]

It's better and easier way to find donor compatible PCB (match printed number on the PCB) and swap ROM located in U12. If the HDA is in good condition it should work again.

Damon