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Just repaired a 1.6b that had a blown RAM bank 2. This is my first ever 1.6b I've worked on. Usually with FRAO systems there's a good reason for a RAM to die and it's usually a thick layer of once damp dust messing with things. But this time the motherboard was fairly clean. Since this is my first 1.6b I don't have a record of common faults like I do with the others. Do Hynix RAM chips commonly go bad?

I have 2 Phillips VAD6011/12 both from 1.1 units. Made around the same time and nearly have the same fault. Pretty much can get no response from them. No eject, no disc seek, no spindle. Either makes the Xbox error 11 or lags out the intro. No Startech attached so not that and has the regular 40 pin and original harddrive. First drive: Works intermittently. Once it properly fires up and doesn't make the Xbox go error 11, it works great. Reads games like nothing is wrong. It's just most of the time it's totally unresponsive, comes and goes as it pleases. Haven't done anything to this one yet. Second drive: Totally gone, also unresponsive. Xbox error 11. At one point while fault finding I turned the Xbox off and while it was booting down the spindle and laser moved for maybe half a second? Like it came back to life for a split second. This drive I have preformed a total capacitor change on, no difference. On the Samsung drives a common problem are the resistor arrays on the IDE line. I checked them out of circuit on drive #2 and two were very slightly out of spec (Only 47.7 instead of 47.0, probably meant nothing), I replaced these two arrays and it made no difference. Voltage seems to be getting everywhere it needs to. No out-right shorts on the caps, chips aren't getting hot and the board is spotless. Any ideas on what could be wrong? Are there any common problems on the early Phillips drives I should know of? Thanks