Thank you so much for all of you replies.
for
Q1, When you power on the drive is there any sound at all. ie can you hear a soft beeping sound coming from the drive
no , ther are no spin and no power.
for
Q2, Fuse at F2 is “open” (I.e. no continuity)?
yes, may be F2 burned so that it is open, infinite resistance; I did not bridged it yet, because it seem to be toasted the board if the green and red area is still grounded. ( 0 ohm between them, after I remove all the component 2 cap and 2 diodes.)
and besides fuse F1 is shorted (normal)
for
Q3 yes after I remove the TVS diodes, I measure them offline, It is about 900 ohm, which mean it is normal
And I would like to ask why green zone is grounded?
And I found some strange thing, for my common sense cap should not have 0 ohm resitance in DC; but in point A, B, C it show 0 ohm, is this normal?
And I can not find correct TLS2505 motor ic pinout, it seem quit different in google search compare to the board, is ther are many different vers?
And if I swap the board, did I need to swap (bios & nvram), or just nvram?
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