John Robertson wrote:
An old trick for testing DRAM in circuit is to simply
press over the
suspect RAM a known-to-be-good RAM with the pins tightly touching. In
many cases DRAM failures relate to failing pull-downs and thus a good
DRAM in parallel will take the load and provide good results.
This doesn't work for Static RAM though as far as I know.
And I don't know if 9114s are Static or Dynamic, I suspect they are
Static, but if DRAM then the test above may help avoid desoldering a
pack of them...
John :-#)#
I've never heard that trick. I have a PCjr in the neighborhood that is
failing to post with a memory error on the 64KB that is soldered to the
motherboard. Is it really just as simple as piggy-backing the chip? I
realize that what you described works only for one class of problems,
but it seems like such an easy thing to try.
Are there similar tricks I should know about?
Mike