After rom chip transfer the PCB just died, any reason?

[Scorpion]

Hi All,

I did rom chip transfering for WD drive (see the pcb in the attached link)
http://img227.imageshack.us/img227/8383/img0066hq.jpg
After the transfering the PCB just died.
This is the second time it happend (the first one was with hitachi drive).
I did the transferring with SMT station (hot air gun) and did it with a great caution.
Any reason why it happend and how can I avoid from this to be in the future?

Best Regards,

[BlackST]

Proper diagnose and avoid frequenting bad companies...

[guru]

The picture or the flash is wonky. Maybe worth heating each leg with a solder iron and make sure the leg is touching the pad.

[fzabkar]

Are you certain that the chip was OK to start with? What was the failure symptom of the original board?

[Scorpion]

The first symptom was corrupted recognized name of the hard drive (firmware issue).
I tried rom chip tranfer to a good PCB in order to diminish the causes but it looks like that I fried somehow the drive or shorted it.
I only heated the chip and not the rest chips..
What can couse the pcb to died?
Any precaution that I can take next time?

BlackST I did not get your answer bad companies? what do you mean?

[Russwinters]

make 100% certain the ROM is connected well.

I have seen where ROM is not fully connected (it may look like it is) and then with some re-soldering it works.


I highly recommend using an actual iron to solder TO the board, for removal rework station will work fine as long as your careful, as you mentioned.


Regards,

[fzabkar]

You may like to try this technique. It seems a lot less brutal to me.

CHIP QUIK SMD Removal Method using a standard solder iron:
http://www.chipquikinc.com/instructions.html

[BlackST]

Blah blah blah... There's nothing to invent. Only a SMD hot air station and controlled temp soldering station and some practice. Otherwise, don't do that job.