Hello Declan, Monday, April 19, 2004, 3:39:20 AM, you wrote:
DM> On Sat, Apr 17, 2004 at 01:09:21PM -0800, George Mogiljansky enlightened us thusly >> Hello, >> For board-level repairs, what is a good website or >> newsgroup? >> Briefly: >> My PowerBook 3400/180 hit the floor and now boots from >> the internal IDE HDD only if a powered external SCSI >> device (CD-Rom or HDD) is attached. I tried another >> internal HDD, no change. Choice of OS doesn't matter. >> Both internal HDDs work fine in another PowerBook. >> >> I can provide more detail, such as: >> "..the SCSI-bus has built-in active termination..the >> SCSI port supports ANSI X3T9.2.." plus pin >> assignments, etc. >> >> George DM> Put a 'scope on the bus and ckeck the logic levels. I'll bet they are DM> borderline fail somewhere, and that extra drive is acting as a pullup DM> or pull down, and making things borderline pass. But an internal IDE harddisk does not sit on the same bus as an external SCSI device?!?! 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. Uwe. -- Author: Uwe Zimmermann INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
