Messiah2 V1.22 problems.
I purchased 10 Messiah2 chips,V1.22(eur) & the track has been cut(at the factory i asume),but I still meter across the diode to be safe. 3 of the chips still have a short across the diode.Removing the diode from the cct, then metering again,the diode is ok,so the short exists across the diode pads.
What i want to know is:
1)Has anyone seen/heard of this fault??
2)Will it affect operation??
The short should obviously not be there,so it may a production fault???One of them also exhibits a strange reading:it meters a "reverse bias" across the diode points with the diode removed,ie, + of meter to Cathode, - of meter to Anode.
I don't want to instal them as i may void my warranty :(
Maybe one for Charlie to answer,or anyone for that matter.
Thanks Guys :)
Can you post a picture ?
I would simply say - does the Messiah 2 work? This is the sort of thing I might go into on a chip that doesn't work - if so, what symptoms? I'm not going to get the meter out right now!
If you're worried about the power diode, just drill the via out with a 1.5mm dremmel/drill.
I think u guys misunderstood me.....the via has already been drilled,but the short still exists,even with the diode removed.
I don't want to instal one in case it has ramifications to the mod &/or PS2.
The short should only exist when the track is not cut/drilled...but it still does with the track cut in my case :(
Gradius,a pic won't help :( they are just normal V1.22 Messiah2 EUR.....i just wanna know if this is a production fault or I got a few dud chips!!So i can return them & get ones without a short :)
You need to set your multimeter to resistor value and not LOGIC.
And then, just check if you get any value (any short), if so, then you have a problem, if not it's all good.
Thanks Gradius & Charlie,
I found that the pre-drilled hole(at factory??) was still causing continuity,& therefore a short across the diode tacks.I scrapped that area & found the short to go away.Fixed this prob on 3 chips :)
I still however,have one chip that meters a reverse bias across the diode(i know u said not to use logic mode),but the good chips don't.If u could explain why???Otherwise I'll just return it for warranty :)
I believe just that M2 is defective, you should NOT read 0 ohms, on diode (anode point) or +3V5 point with the track in the other side.
No,no.....i fixed the ones that read 0 ohms by ensuring the track was cut......its just the one that reads a reverse bias(on diode mode),but reads ok on the others that I'm concerned about :)