Messiah2 V1.22 problems.

**tickford** · 02-23-2003,10:11 PM

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

**Gradius** · 02-24-2003,12:37 AM

Can you post a picture ?

Gradius

charlie_ps2 · 02-24-2003,04:22 AM

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.

**tickford** · 02-24-2003,04:07 PM

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

**tickford** · 02-26-2003,06:36 AM

....Bump

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

**Gradius** · 03-01-2003,02:35 AM

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.

Gradius

charlie_ps2 · 03-01-2003,10:00 AM

Tickford - try it!

**tickford** · 03-01-2003,06:10 PM

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

**Gradius** · 03-01-2003,07:17 PM

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.

Gradius

**tickford** · 03-01-2003,08:02 PM

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

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