Hi

Few days ago PCB board in my HDD gave out smoke (somehow I managed to plug the power plug wrong way). I've ordered replacement bearing in mind matching all the the possible numbers.
(http://forum.hddguru.com/howto-how-to-replace-maxtor-calypso-iii-board-vt5977.html)

I've replaced pcb and powered up, few seconds later the drive started making clicking noises and about 10 seconds later stopped and sounded normal (every restart same routine occurs). BIOS detects it as "hard disk" but gives no usual info (model, capacity etc.). It doesn't show either in Windows or MaxBlast 3.6 or PowerMax.

I've been googling around and found that apparently firmware is stored on the actual platter not some chip in the pcb, so replacing pcb should work fine. Correct me please if I'm wrong.

As a last resort I could try replacing the chip with visible damage (soldering 8-pin chip in the top left corner of the pcb - FDFS2P102A
Integrated P-Channel PowerTrench MOSFET and Schottky Diode), but before I'd like to try software solutions first.

So what is your advice? Did I miss something and pcb is not matching or something else failed as well?

Info for the original HDD:

DiamonMax Plus 9,
Code: YAR41BW0 K,M,C,D
S/N: Y3MXDFPE
6Y120L0132611
PCB: M6FYA
301862101
CALYPSO/KOI_P/THERM (replaced with identical one)
Main Controller IC: 040111300(agere Ardent C8-C1)
HDD Motor Combo IC: L7250E 1.2

Info for the replacement part (taken from description in eBay - #280064577926):

Main Controller IC: 040111300(agere Ardent C8-C1)
HDD Motor Combo IC: L7250E 1.2
Cache Memory: 2MB
Board Number: 301862101
Firmware: YAR41BW0
Tested and Working on the following HDD:-
Maxtor Diamond Max Plus 9 80GB ATA/133 HDD
Cache Memory: 2MB
Code: YAR41BW0 N,M,B,A
6Y080L0422611
Maxtor Diamond Max Plus 9 80GB ATA/133 HDD
Cache Memory: 2MB
Code: YAR41BW0 N,G,G,A
6Y080L0422601

Best regards,
Swarvek

Most likely it is more than just pcb... I think you've also fried the preamp (a chip which is mounted near the heads inside of hdd).

Obviously this is not something can be easily fixed...

Yes if u can change it thats the only solution but its not that easy bcz the chip is very small and has many pins .

Sounds like heads to me.

I had something very similar with a Maxtor 10Gb drive. Fried PCB.

Changed PCB, drive span up but just clicked.

First I suggest try hot-swap to confirm. Power up good drive and stop spindle (with PC3000 or HRT,or something like that), unscrew the PCB and put it onto the duff drive. Soft reset HDD and see if it ID's.

If it still clicks, then almost certainly heads.

On the one I worked on, I changed the head stack from the good drive to the suspect one, and the drive worked fine, a bit noisy but good enough to get an image.

Preamp.

When U plugged the power connector reversed, the 5V line received 12V, it is fed ~directly (through a 0 ohm resistor as far as I remember) to the preamp, so
the head alignment is important in this model, so replacing the head assembly is probably not the best solution, I always change only the preamp in such cases.

pepe