On Fri, Oct 7, 2016 at 10:53 PM, Mike Stein <mhs.stein@gmail.com> wrote: > >> as I do quite a few repairs of old gears, I think I can give a number >> of reasons why I almost always install a socket: >> 1) most of the times, the failing chip is not alone, the replacement >> can be killed instantly by another fault: random example is a bus >> conflict where a failed input or output sinks/source >> current against another output, this in many cases makes the >> replacement fail soon again. >> 2) in the troubleshooting process, might often be good to >> isolate/replace a signal around a failed chip (because there're other >> related faults not yet identified), a socket makes this process >> easier. >> 3) it's cheap enough that even if you are sure there's no reason to >> fall in the 1) and 2) cases, you don't just take the chance to be >> wrong. >> >> (all IMHO) >> >> Frank >> >> Message was sent through the cbm-hackers mailing list > ========================= > All valid reasons, although in my experience it often is only one chip and when it isn't it's often obvious what else is wrong. different experiences. > > But it's not about how much it costs, but whether you're concerned with keeping the board/system as close (or easily restorable) to original condition as possible, with some people even making sure that date codes on replacement chips match the rest of the system. > > Different priorities for different folks... This is going too off topic, so I promise it's my last rant. I was repairing commodore equipment (mostly) back in the '80s and nobody would solder back a chip without a socket, at least the ones who I learned from. Also nobody cared much about date codes too. My own C64 purchased in 1984 has chips with up to 1989 date codes (I repaired it several times during its life). Commodore itself couldn't make two boards the same: different factories would socket the main chips, some would socket only PLA and SID, others would socket the ROMs or the VIC-II and 8701, some others would not put any socket. Is my C64 not "original" then? I had the famous speeddos mod installed in 1986 too. I consider the mod original as at the time it made great sense to have it. Repair, in my book, is restoring the functionality to full original specification (or better), else is drifting into religious beliefs. :) <-- please notice. Frank Message was sent through the cbm-hackers mailing listReceived on 2016-10-08 15:01:55
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