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Discussion Starter #1
Which is the ROM to change from burned PCB to donor PCB
on this Barracuda 7200.11 ST31000333AS ?
The royair post suggests it is the Winbond chip ?
The donor board is compatible for model, P/N, firmware, datecode & First3 S/N.
 

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Google the pat numbers from each chip, only one should be listed as a ROM 0r EEPROM - one will probably be a serial flash, other ??? but googling the numbers off the chip should narrow it down
 

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Are any of the others listed specifically as ROM or EEProm? barring a ROM/EEPROM then this is probably it. If a ROM/EEPROM then that would be the one.
 

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Discussion Starter #5
the other chips are labeled (not sure what you mean by pat numbers)
burned board
4833A $DEdelta .W88A not results on gg search (compare notsleepy thread)
winbond 25X40AL007 0849
4820 $APdelta .W91K not results on gg search
and the really small fVITAK 4274 8 leg schip not results on gg search

donor board
4833A $BCdelta .W88A
winbond 25x40AL007 0849
4620 $DBdelta .W88K
and the really small fVITAK 4274 8 leg chip

So the weird thing is that the ROM I'm supposed to change is exactly the same
between the two board.
Does this means (together with clicking sound and fact that smooth chip also shows
a burned trace) that it is very likely that internals (preamp) are affected, and that
a ROM change is not usefull ?
 

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Discussion Starter #6
matching data

burned board
S/N 9TE20740
ST31000333AS
P/N 9FZ136-516
firmware CC4H
Date code : 09372
Site Code TK
Barracuda 7200.11 1000 GBytes

donor board
S/N 9TE1WQBJ
ST31000333AS
P/N 9FZ136-516
firmware CC4H
Date code : 09356
Site Code TK
Barracuda 7200.11 1000 GBytes
 

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The modules written to the ROM are what is important. The parameters unique to each drive are written tot he ROM for that particular drive. The ROM is basically empty when it is installed tot he board, then the adaptives like Preamp Bias, zone map, headmap, SA start sector are all written for each specific drive. If the drive spins and clicks, then the Smooth isn't completely gone, that is the motor control chip. I'll check some documentation at work on Monday and try to determine which is the ROM.
 

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Discussion Starter #8
IT WORKED
the winbond ROM has been changed
and the harddisk started instantenously as if nothing had happened.

I have all my valuable data back for
100 Euro for the donor disk (only used his PCB)
10 Euro for the friend who changed the chip (use hot air to free
the chips from donor and receptor disk, and to fix original chip
to donor PCB, used fine soldering to garantee correct connections)

Thousand times thanks for the altruistic professional advise.:pray:
Greetings from Belgium : [email protected].:wave:
 
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