Thanks for your reply.
What do you recommend to check and avoid further dammage ?
Brgds
Franck

I could use a little help. I have:
YAR41BWO - 29 DEC 2003
K4FYA and Agere C8-C1 chipset. Main PCB fried. I smelled burning. I replaced with PCB L6FYA and looks identical. The drive spins up but only tries to initialize. It clicks (not like a head crash click) about 10-15 times and then stops (either at boot or when attaced as a USB enclusure). Any tips on getting this back? Do I need a different PCB ?
The fella on Ebay said it was a match but I am thinking from some of the post here perhaps not. One of the post here said if the HDD spins up it not a preamp. My drive here spins fine I can feel it and hear it. So I am thinknig my f/w is not exact enough match ? Any help is appreciated.

It could be a bad PCB, Service Area or Preamp. Accurate diagnostics has to be done in order to determine exact problem.

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Is there a way to check the preamp like resistance on certain pins of this drive ? The W503 IC was fried on the original PCB due to owner switching the molex. I replaced the 503 chip on original pcb but drive not spinning. No click either. I suspect something else fried, perhaps the Smooth chip too. Thanks for the replies. I'd like to take this as far as I can before shipping it off for recovery. And depending on how much the recovery cost the owner will not want the data. Are the two pcb I mentione din my original post compatible as far as firmware is concerned ? Or is there data on the EEPROM that must be transferred to the new PCB ?

You mean a test like the one carried out in this thread?
maxtor-160gb-harddisk-burnt-t7740.html?hilit=maxtor%20preamp#p47345