FIXED ! Naomi2 stuck in test

[Mrhide]

anybody knows what this means?
if I put a cart, it jumps here and that's all I can see or do.

If I remove the cart, it loops in - > test page -> reboots -=> test page --> reboot..

Thanks

 

[Derick2k]

Weird, never seem them do that.

Maybe reflash the bios or check the physical button? If you have another working one, swap out the filterboard/bios and see if that solves the problem. Otherwise, check the pins on the card connectors, etc...

 

[Mrhide]

should have mentioned what I tried :

- bios reflashed
- filterboard swapped/changed
- supercap changed
- cart swapped/changed with same msg: this game is not acceptable by main board
- 2 Netdimm tried / changed

pretty much tried everything I could think off before asking for help !

 

[Derick2k]

should have mentioned what I tried :

- bios reflashed
- filterboard swapped/changed
- supercap changed
- cart swapped/changed with same msg: this game is not acceptable by main board
- 2 Netdimm tried / changed

pretty much tried everything I could think off before asking for help !

Oh that sucks. There are a few members that know the system well, hopefully, they chime in.

 

[ShootTheCore]

Following because my Naomi2 does the same thing. Haven’t had a chance to dig into it further yet.

 

[Mrhide]

... I am back at this issue 4 years later, mostly thanks to this thread

Here's what I found:

The issue appears to be directly linked to the 3.3V:

Measured at the filter board:
- if it is very low at 3.0, it goes to load the game (cart virtua tennis) and I get a "jamma i/o board not found" message. The jvs service / test buttons don't work nor the filter board buttons (I've tried 3 filter boards, working on other naomis)

- if it's low at 3.1, it goes in the test page and stays there. The jvs service / test buttons don't work nor the filter board buttons (I've tried 3 filter boards, working on other naomis)

- at 3.28, it goes to the test mode for 3 seconds and reboots. NOTE THAT THE BIOS SAYS JAPAN NOW?!

- at 3.3 I get an "invalid format" on the screen / black screen.

so my questions for the experts : What would be responsible for handling the I/O that would be so sensible to the 3.3v? could it be caps?!

thanks!



EDIT: and I will be damned, for the kicks after posting this I thought, and If I go above 3.3 what happens?! at 3.42 THE GAME LOADS AND I CAN PLAY IT! WTF!!

 

[XtraSmiley]

Awesome man, congrats!

It goes to show that being able to adjust 3v is vital on these systems!

Try cleaning the 3v connections with 99% and hitting them with Deoxit. That might help get more power across, thus being able to lower the 3v down a bit.

 

[nem]

Try measuring the voltage from the motherboard. There are test points on the PCB.

 

[Mrhide]

test points: ok will try to locate and measure.

edit:

3.42 outside

inside test points
3.3: 3.3 inside
3.5 : 3.497
12 : 11.73
2.5 : 2.5

so I guess connectors connectors connectors right ?

edit 2: Of course trying to boot a dimm board or a netdimm brings me to a black screen only. I made sure the internal voltage was still 3.3, still no go.
I am still curious to know why it is so weird on voltage...


and something is really weird with the regions! I got Korea and C9d8C D D9P!