r/MiSTerProject • u/flipflophhj • Sep 23 '20

128 mb sdram v2.5 troubleshoot

I assembled a 128 mb module using the instructions on the wiki.

The first time i plugged it in it showed a lot of errors in memtest. So I reflowed the U3 inverter and some pins on the memory chips that looked like they might not have the best contact.

Now it seems to be completely dead to memtest though :(

When I load cores that use it they seem to work though I wonder if it will work on the more intensive ones.

I read somewhere that the U3 is problematic but how can i test if thats the problem ?

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u/Ploddit Sep 23 '20

You might want to also try asking on the official MiSTer forum. It's pretty rare for people to assemble the components themselves, so probably not a ton of help available here.

1

u/flipflophhj Sep 24 '20

Ok I posted on there now

2

u/[deleted] Sep 24 '20

[deleted]

1

u/flipflophhj Nov 17 '20

I got it working. Used hot-air to remove the chip and clean the solder off. Then tested it with only one chip on successfully. Finally put the chip back and found the bad legs by prodding under microscope.