1D.4s keep rebooting intermittedly

  • Thread starter Thread starter cevoner
  • Start date Start date
  • Replies Replies 8
  • Views Views 439

cevoner

Member
Joined
Mar 8, 2011
Posts
188
Country
USA
Region
Massachusetts
Hi,
Guess this is the place for issues that can drive you to say, "Why"?
I have now 2 ID.4s Mobos, 1 Pal, 1 NTSC. I started with the NTSC and it came from Versalia and it looks like a CIA was replaced near the external drive port and on the underside a wire was added. A resistor is added to one of the custom chips too. Had 3.1 rom. The PAL board looks real clean and has had its caps replaced. Has 2 more resistors to the back 123C/R, 125C/R too. The NTSC has none. Both these boards had many options added to them. Indivision, Hard drive 2.5 and a 3.5 (at 1 time), an ORONCO PCMCIA, A Micromys mouse adapter, a Lyra KB adapter and a Expander clockport card. I have added a 1260 and ACA232 too. Without them, same issues. I have a subway and Delfina I want to add but without these if it could run stable great.

The issue is that it is rebooting intermittently most of the time just on for an hour. I've removed added, just booted with no startup sequence, just always on clockwork it will go black either sit there or reboot on its own.
Both of them no change. The only common thing so far is they both were tested with the 3.1 rom. I'm going to try the 3.0 rom I have next to see if that changes things. Oh, and I've tried 3 power supplies: Logisys 480 watt, Corsair 430 watt and a Corsair 750 watt. Pretty sure power is clean.
Someone suggested to add 60 ohm resistor to the E121R & 122R. I think 27 Ohm is there on both.

I thought overheat but by touch they seem fine (the chips) I'm suspecting the Rom chip since the 3.1 rom was in both MB. Will try softkicking a 3.1 or even use the 3.0 I have not used yet since I have 3.9 WB. Its' been really frustrating as the 2 boards (1D.4) do the same thing.

Seems like a common thing with 1D.4s. There are no gurus or freezes just black and reboot. Thanks for any input.
 
Last edited:
Voltwise yes, pretty beefy. The Logisys was cheap at 480 Watts but the 2 Corsairs are suppose to be the best. Using a pretty good power strip too.
Have 3.0 rom up now with some issues. ACA232 only loads 9 meg instead of 128. Don't have many 3.1 disks. Hard drive just was no go since it was formatted under 3.9 OS. With the hard drive connected I could not see the 3.0 insert disk boot screen. All other screens showed up. Really strange. It came back once I disconnected the hard drive. I tried to power the floppy with the motherboard and no go. Stopped while it was reading. This is with the 430 Watt Corsair. The 750W (which is overkill) I'll try later.
It would go out with just floppy before with 3.1. Now has floppy and ACA232. I may have to do those MB fixes. Trying to avoid that.
 
is the power supply ok?

Power supply reads 4.97v-4.99v cold or on for awhile right from the supply.
But from the motherboard floppy connector goes way down
4.42-4.52v cold
and
4.38-4.50v from floppy connector when on for awhile.

The motherboard fluctuates voltage for some reason.
The other MB with new caps may be doing the same thing.
Some people add power to the floppy connector. It may be dangerous some say.
The power supply itself seems fine.
 
Can you measure the voltages on the Amiga power connector inside the case? IF the voltage is OK then you have a serious current leakage or excessive consumption somewhere in the board (doubtfully).

Add the 5V wire from power connector to 5V floppy power connector if the voltage is OK on the Amiga power connector.

If the voltage is low on the power connector, the power cable is the problem. Or oxidation in the power socket/plug.
 
Can you measure the voltages on the Amiga power connector inside the case? IF the voltage is OK then you have a serious current leakage or excessive consumption somewhere in the board (doubtfully).

Add the 5V wire from power connector to 5V floppy power connector if the voltage is OK on the Amiga power connector.

If the voltage is low on the power connector, the power cable is the problem. Or oxidation in the power socket/plug.

The square din connector measures OK. The floppy connector is reading low when the 5 pin din is connected. There are 4 filters inside at the din connector on the board. 1D.3 and earlier have one. Could this be why the voltage degrades by .7 volts. When it hits 4.2 it blacks out. Maybe the ATX supplies do not have steady voltage. But it is steady 4.9 V from the supply. The MB is suppressing it somehow.
 
when you measure the voltage at the atx supply is it under load?

are you measuring the voltages when its not connected and when it is?


also while the 1200 is powered on can you feel any of the ic's to see if any of them get hotter than others.some should get warm but not hot.
 
Last edited:
I measured direct on the floppy connector when unit is on with hard drive & ACA232 connected only. Nothing feels really hot.

Something I'm looking at is this connector just ordered for my ATX supply. I ground power on & ground together (no switch) currently (may be unwise) and this has some load additive to the 3.3v. Worth a try?


when you measure the voltage at the atx supply is it under load?

are you measuring the voltages when its not connected and when it is?


also while the 1200 is powered on can you feel any of the ic's to see if any of them get hotter than others.some should get warm but not hot.
 

Attachments

  • cords.jpg
    cords.jpg
    96.5 KB · Views: 9
Update No reboots after rewired power

Update No reboots after rewired power

Hey, this 3.3 volt load on this connector really helped the 5v be more steady voltage. I now get no lower than 4.92 volt even under heavy expansions. I have a 1260 plus 192MB memory and it holds steady. With ATX supplies this must be needed. The same supply dipped to 4.32 before this.

I also rewired with thicker wire and better connectors. Made a difference.


I measured direct on the floppy connector when unit is on with hard drive & ACA232 connected only. Nothing feels really hot.

Something I'm looking at is this connector just ordered for my ATX supply. I ground power on & ground together (no switch) currently (may be unwise) and this has some load additive to the 3.3v. Worth a try?


when you measure the voltage at the atx supply is it under load?

are you measuring the voltages when its not connected and when it is?


also while the 1200 is powered on can you feel any of the ic's to see if any of them get hotter than others.some should get warm but not hot.
 
Last edited:
Back
Top Bottom