seagate ST340810A control board

hello all,

this is my first post here. I i see many forums on net but i impress by this forum.

i am gsm repairer. and i have problem with segate ST340810A.

what happened with my harddisk.

once i atteched second harddisk as slave. cause of bad wire

i can't connect second HD as slave. at that time an stranger came to me for his mobile phone repairing. he told me that he is computer hardware eng. and i can solve your problem.

i say ok you can try. he pulled all cable from HD with power supply on, before i say him to power supply off first. then he
push back all cable to HD with power on. then [ youall know what should happen ] hD can't boot - detect....

Then i measure voltage at HD connector 5 v. and 12 v.
is ok, but at disk moter[?] connector side voltage is + 7 v.
and IC [ Servo? ] near contact is geting to much hote.

my friend have Seagate ST340823A HD and he say you try to change my control board with your HD and backup your data.
but you have to return my HD ok.

can i replesh control board with this different No. ?

after this all i go to Seagate warranty side and se that there are this HD is " In Warranty" "Expiration 22-APR-2005 "

any help wellcome. waiting for quick reply.

sorry for my bad english.

thanks in advance.

W.B.R.