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PCB possibly broken, how to test Preamp before purchase?

 
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Smyans
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Joined: 02 Dec 2010
Posts: 2
Location: FINLAND
PostPosted: Tue Dec 07, 2010 5:12 pm    Post subject: PCB possibly broken, how to test Preamp before purchase? Reply with quote
I've got Seagate ST3750330AS and the symptoms indicate that the PCB is broken.

Before I purchase a donor PCB (I have requested one and there is one available, that I could purchase), I just would like to know, how to test the Pre-amp in order not to purchase donor PCB just to find out that the Pre-amp was not OK.

Additionally, there is not what so ever trace or sign, that something would have burned or damaged, in the PCB.

But the SMOOTH Chip is the one I suspect as it heated up so quickly when the power was turned on.
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sunnydreamspace
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Joined: 04 Jan 2009
Posts: 540
PostPosted: Wed Dec 08, 2010 12:00 pm    Post subject: Reply with quote
hi,
except SMOOTH Chip. can you find out others chip damaged? for test preamp you can take Multimeter for check the pins. but i don't think this way good for reach your purpose. you'd better is get a donor PCB swap ROM chip and attach it on hard drive for test.
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