*solved* chip troubles, replacement for pc engin duo SRAM?

[NichlasEk]

I think its time to start a new topic, i hope thats ok, if not pleas send pm.
So im curently working on two pc engine duos.

Solved: new ram installed working fine! 1st: was thought working after ram swap with snes, however, when i got the cd module to work it turns out i get garbled sprites and random graphic (hucard work fine), hence the snes ram doesent seem to be working (or the original ram). Im pretty sure its one of the HSRM20256LM thats broken. I found a MB84256C-10LL on aliexpress. Im not that knowledged about ram. Anyone know if its a suitable replacement?

2nd:*solved* new opamp installed and vias repaired. Was about to put this one together for a final plastic shine, when i touched the board and a chip said *crunch*. Had a look, and the 4558 opamp had croumbled by my light touch. Diddent see that before, and now no sound. ordered pincompatible replacements on ebay

New problem, boght hop m3 replacements on ali express.
Worked fine for 3 days. Then cd audio cut out. Then no disc read. *sigh* advice?

This forum is full of great information!

Have a nice weekend!
/Nichlas