Re: Re[2]: Board-level repairs, anyone?

[vartan]

I had a problem like this once with a powerbook, a surface-mount micro fuse blew in the region of the rear scsi connector, I think it had to do with termination power as well, and the problem is that even on the macs with internal ide drives, if the machine has a scsi bus the OS looks there first to boot from and if the bus is totally open-ended (ie not terminated internally or externally) it floats in limbo on either a gray screen or a flashing question mark disk, although in some cases it will boot after a ridiculously long time (>10-15 mins) which I assume is when it finally times out in some way. Of course, you may have some other underlying problem, but it seems like it could be similar. But unless you really like dealing with tiny tiny SMT fuses smaller than a grain of rice...either way it sounds like everyone arrives at a similar conclusion, term power.


On Apr 19, 2004, at 1:54 PM, Richard Purdie wrote:

I would think that somehow the powered external device supplies the
internal device over the termination power line on the SCSI bus and
that some internal power connector, power cable or power trace broke
during the impact....

In this case check the 5V supply of the internal HDD and try to trace
it all the way back to the power converter.

It could also be that some of the ground connections have got separated and
adding the external drive reconnects them. Try the 5V power first and then
the grounds if that fails.

RP

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Author: Richard Purdie
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