13 Sep
2013
13 Sep
'13
10:20 a.m.
On Fri, Sep 13, 2013 at 12:34 PM, Alexandre Souza
<alexandre.tabajara at gmail.com> wrote:
Ethan, firstly measure continuity between the pins
of the DRAM and all
the other connections. Most of the pins of the 4164 are in parallel with the
others, only 2 or 3 pins are exclusive. Since the dram was taken out,
probably one of the pins took off the connections of the internal layers of
the board. It happens a lot when unskilled person unsolder a chip on a
multilayer board.
I didn't mention that, but I did check it as part of repairing the bad
solder joint
on of the refresh pins. There is good continuity from this socket to
the adjacent
chips except, of course, for Din and Dout.
Hope that helps
I wish it had.
-ethan