Quite often my micro will boot to a black screen or lock up in the first couple of minutes when its first turned on. After a few minutes of warmup, no more problems unless a program acts up. Is the black screen a known OS4 problem?

I know that cpu's can fail with cold as well as overheating. My micro vcore is set at 1.44V, but I'm about ready to bump it to 1.49V to see if these early lockups go away. There was one other member here that said he had upped his vcore to 1.49V. If you're reading this, can you tell me how your system is doing.

Anyone else having problems with booting to a black screen on their system with a micro or any A1?

Update 3 here.

_________________
Hate tends to make you look stupid...

@sundown

Similar symptoms described - black screen, slow to become active? (Post#4)

http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=14882&forum=14&4

Best Wishes,
#6

Last edited by number6 on 28-Oct-2005 at 08:38 PM.

_________________
This posting, in its entirety, represents solely the perspective of the author.
*Secrecy has served us so well*

@sundown

Be very careful when trying to set the right VCORE. You have to be sure.


I hope it will work out, and that your CPU and/or machine won't be fried..
It happened to my old A1G3XE almost a year ago...

@sundown

Re:vcore
Wait till @Samwel shows up or drop him a PM or email.

Until then this is the thread you were referring to on Micro FX/GX vcore?
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=14347&forum=12&5

Best Wishes,
#6

Last edited by number6 on 28-Oct-2005 at 09:02 PM.

_________________
This posting, in its entirety, represents solely the perspective of the author.
*Secrecy has served us so well*

@number6

That last link was the one I was thinking of, thanks. I PM'ed him about his system to see how it was holding up with the change.

Is Samwel having the same problem?

_________________
Hate tends to make you look stupid...

@sundown

Quote:"Is Samwel having the same problem?"

Sure hope not. (I sent him email on this).
Harry wrote a few threads concerning Micro vcore also.
I was suggesting you wait until you can discuss this with Harry.
Also, since he did not participate in the thread I referred you to, I thought
it would be wise to wait, in case Harry had not read -that- thread.
You know how stuff slips by here. Can't read it all.


Best Wishes,
#6

_________________
This posting, in its entirety, represents solely the perspective of the author.
*Secrecy has served us so well*

@number6, Sundown

Hi guys!

No I'm not having any such problems with my µA1-C.

What case do you have for you Amiga? Was it like mine a Antec Aria?
If yes, it should have a good power supply which is compatible
with the Mini-ITX boards.
If no, please test another case (power supply) as most problems with
instabilities like this comes from incompatible power supplies.

_________________
/Harry

[SOLD] µA1-C - 750GX 800MHz - 512MB - Antec Aria case

Avatar by HNL_DK!

@Sundown

Setting your 750GX 800MHz to 1.49V is not a problem.
The specs says 1.45V ±0.05V, which makes 1.49V a better
setup than 1.44V really, if you consider the Volt drop.

_________________
/Harry

[SOLD] µA1-C - 750GX 800MHz - 512MB - Antec Aria case

Avatar by HNL_DK!

@Helgis

Unfortunately, you're an expert when it comes to vcore setting.

Vcore setting is now 1.44V (default), the next step up is 1.49V, a 50mV increase (1/20th of a volt). Data from the IBM 750GX spec sheet.

733-800MHz vcore 1.40 to 1.50V (800MHz default)
933-1000Mhz vcore 1.45 to 1.55V

The voltage increase would be very small & in spec, but I still worry about the power increase & how well the micro is cooled.

I am NOT overclocking!

_________________
Hate tends to make you look stupid...

@Samwel

I have the same case as you.

The ps could require a short warmup time as well. If raising the vcore didn't help, that would be a good place to look. I do have the spec sheet that says I can do it.

I sure wish the GX had a temp monitor built in & working. I've read where some G3s do, but don't know if the GX does or the newer G3s coming out have it. Would make life so much easier.

What about the black screen issue, vcore or OS4? Somehow, I feel their 2 different issues.

Last edited by sundown on 28-Oct-2005 at 10:36 PM.

_________________
Hate tends to make you look stupid...

@sundown

I wouldn't worry about setting it 0.05V higher when not upping the
MHz.. Eyetech was going to make a board with a 800MHz GX without
a fan even If it can run fine with only a heatsink why would you
have a problem? Also you're still staying well inside the specs.

_________________
/Harry

[SOLD] µA1-C - 750GX 800MHz - 512MB - Antec Aria case

Avatar by HNL_DK!

@Sundown

I had the same black screen when I thrashed my kickstart layout.
But it has never happened while being okey.

I'm sure this is connected to the power problem.

EDIT: It can be that your power supply is not delivering clean
power to the µA1 at the beginning, taking a while then working ok.
You should actually try your board with another case.
Preferably another Aria case as mine works fine

Last edited by Samwel on 28-Oct-2005 at 10:50 PM.
Last edited by Samwel on 28-Oct-2005 at 10:49 PM.

_________________
/Harry

[SOLD] µA1-C - 750GX 800MHz - 512MB - Antec Aria case

Avatar by HNL_DK!

@Samwel

When I get brave, I'll try changing the vcore first, add one jumper. My system is stable after the first couple of minutes. Gives me a little time to enjoy my coffee/beer while I wait. You may be right about the black screen.

_________________
Hate tends to make you look stupid...

Sometime when I turn my µA1 on it just sits there with a black screen with the CD drive lighting every few seconds.

I usally just shout at it, pull the power cable out, plug it back in and it works.

Is that the same as your problem?

I wouldn't even think about changing the Voltages on the CPU on an attempt to fix it. But it's yours to do with what you want...

_________________
Rage quited 29th May 2011

@Stephen_Robinson

My black screen is different. My micro will boot & load the kickstart files & then just give me a black screen as the startup-sequence never loads.

As far as vcore, I did my home work.
Here's the electrical specs for the IBM 750GX IBM 750GX pdf page 15. You will see that the next vcore step up is within spec for this cpu.

Its one of those things I would do to see if it helped, but I would put it back if it didn't after a short period of time.

_________________
Hate tends to make you look stupid...

@sundown

Have you tried a higher vcore or another power supply yet?

_________________
/Harry

[SOLD] µA1-C - 750GX 800MHz - 512MB - Antec Aria case

Avatar by HNL_DK!

@sundown

When I had problems with my machine (uA1-C with FX CPU) locking up constantly I tried upping the VCore to 1.49 but that made the problem worse.

I've since had to lower the VCore to 1.30 and everything has been running fine for the past 2 months.

It could be the PSU as already stated though.

_________________
This fire is burnin' and it's out of control
It's not a problem you can stop, It's rock n' roll - GN'F'N'R

@Samwel

Not yet. My micro is sandwitched between my monitor & my 4000T, so requires some work to extract. The problems show up just enough to bother me, but not enough to get me frustrated, if you know what I mean. I did PM another user who upped is core for the same reason, but no word back from him yet as to how his system is doing.

_________________
Hate tends to make you look stupid...

@sundown
Before fooling around with DIP switches I would invest in a serial cable and find out what is really going on. Without the information you receive from a debug load you are purely guessing. I would prefer an educated guess versus a blind guess. Joe at Software Hut sells the necessary h/w if you need it.

_________________
ExecSG Team Lead

@Slash

Interesting, that would imply that your cpu was either heat sensitive or clock sensitive. Did your lockups come after your system was on for a while or all the time? Clock timing (rise time) can change with temperature changes as well as with voltage level settings. A clock's rise time will always be faster when cold & slow down when things have warmed up. A clock's rise time will be faster with a lower voltage & slower with a higher voltage. In your case, you needed a faster clock rise time for stability.

Thanks for posting as this problem is really starting to make more sense to me now & looks to be less of a PS problem. I would like to know if your lockups were right after bootup, all the time, or after warmup.

_________________
Hate tends to make you look stupid...