hello all,
sometimes there is a continuous noise come from WD HDDs mainly with L-shaped PCBs
with motor ICs ( Smooth 1.3) , (L6278 1.7) & (L6278 1.2).
the noise like : Trrrrrrrrrrrrrr or Trrrr....Trrrr...Trrrrr
so all we have to do for fixing this problem is:
1- clean the connection points which connect the head stack pins with the PCB using a pencil Rubber ...carefully... cause cleaning with force may remove one or more of the small capacitors or resistors on the PCB.
2- then clean the motor IC pins thoroughly using a solvent & Toothbrush.
-Note- the two steps mentioned above solve the problem in few cases.
3- if the two steps mentioned above didn't fix the problem , you have to replace the motor IC cause it's damaged.
-Note- in case of Motor ICs (L6278 1.7) & (L6278 1.2) first try to desolder them then resolder them again before u decide to replace them with a new ones ... this sometimes work , but if it didn't work ... replace them directly.
Best Regards & Good Luck
Ahmed_Samy
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HDDGURU FILES
: it's Strongly Recommended To replace The Motor IC Directly when you are sure that it's damaged (I mean when it's damaged without any external symptoms like burns) ... even if it's (L6278 1.7) or (L6278 1.2) without any attempts with the Damaged IC (cause i think that trying to fix the problem by desoldering the damaged IC and resoldering it again (in case of Motor ICs (L6278 1.7) or (L6278 1.2) as i mentioned above) may damage the PCB when you power it on again with the damaged IC.