thanks for the link and the hint.
Do i have to bridge the connection of the part after removing it?
- Thread starter TylerDurden67
- Start date
Do i have to bridge the connection of the part after removing it?
Hi, I just started replacing every ram pair and when I replaced 116/118 that fixed it. This was for a Naomi 2.
They are very easy to replace.
Note that I was using the old multi bios. Possibly that bios has a buggy ram test (it's based off an old bios revision). If you are using the multi bios, try the ram test using normal bios latest revision.
They are very easy to replace.
Note that I was using the old multi bios. Possibly that bios has a buggy ram test (it's based off an old bios revision). If you are using the multi bios, try the ram test using normal bios latest revision.
Casselfornia
Student
Exactly those to were gone on the last 2 Naomi's I repaired. So I can confirm that this maybe a common issue: It boots very slow and has graphical glitches.
I'm attempting to fix a N1 that boot slow. Freeze before finishing ic09. I have replace both ic09 and ic11 to no luck. Will a video ram cause the same issue on a N1? I don't have any on had and don't want to swap from my parts board as I don't know if they work.
Casselfornia
Student
Try IC16+18. Last one IC 16 failed but showed okay during ram test and did the slow boot shit you mentioned. N1. IC was already placed so I wondered why I got the slow boot. I guessed it's 16 and I was right.
Buy a few of the ics. Handy to have em stocked. I wouldn't gamble with the ones from the parts board.
Buy a few of the ics. Handy to have em stocked. I wouldn't gamble with the ones from the parts board.
I have a bunch just non of them match the configuration. Mostly 4mx4 and 2mx8. I want to confirm ram grouping is left to right and not up and down going off the ram test screen
Casselfornia
Student
hy57v161610dtc-8 those worked for me. Widely available. If we still talking VRAM.
StormyNormy
Student
Hi, my Naomi 2 with GD-Rom setup is giving me headaches. Used to work but it now freezes on boot, or boots into "System initializing" (not memory check) and freezes or gives me straight up a error 22 message ("Communication error occurred between main board and option board"). I think I can hear the GD-Drive spinning up, but from the Naomi 2 to the PSU, everything is quite loud.
Any suggestions as to what could be the cause or what else I could test?
Thanks
Any suggestions as to what could be the cause or what else I could test?
Thanks
Naomi 2 is in a Naomi Universal cab, original PSU. Original BIOS 23608, swapped with 23608-A. GD games Virtua athletics, works with 23608, GGXX Slash, worked with 23608-A. Cartridge Virtua Striker 3, works with 23608. I have 2 GD-Drives, I get the same result with both.
I have tried the following to narrow down the possible fault, all results as expected:
Run cartridge with jap BIOS (Error 21).
No Dimm board (Error 01).
With Dimm but not connected to GD-Drive (Error 25)
With Dimm, connected to GD-Drive, but GD-Drive not connected to power (Error 25)
With Dimm but cover GD-Drive cover open (Error 23)
With Dimm, GD-Drive cover closed, no game (Error 24)
The did the following tests in the test menu:
Tested RAM without cartride, all good.
Tested ROM board, all good.
Tested Dimm board without game (prog. ver. 1.02, all good except Dimm status = bad and GD Drive bad).
Tested Dimm board with game, I get a Dimm board time out message and "Unknown game" is displayed in test menu
I have tried the following to narrow down the possible fault, all results as expected:
Run cartridge with jap BIOS (Error 21).
No Dimm board (Error 01).
With Dimm but not connected to GD-Drive (Error 25)
With Dimm, connected to GD-Drive, but GD-Drive not connected to power (Error 25)
With Dimm but cover GD-Drive cover open (Error 23)
With Dimm, GD-Drive cover closed, no game (Error 24)
The did the following tests in the test menu:
Tested RAM without cartride, all good.
Tested ROM board, all good.
Tested Dimm board without game (prog. ver. 1.02, all good except Dimm status = bad and GD Drive bad).
Tested Dimm board with game, I get a Dimm board time out message and "Unknown game" is displayed in test menu
StormyNormy
Student
After a good week of research of what could be the problem and what to try out, I measured the voltage of the setup under load. To do that, I had to remove the cover from the mobo and dimm board. To my surprise everything operated without any problems (yes, really).
I put the Naomi 2 back in its case but not the dimm board and now the setup works again. I'll leave it that way.
P.S.: The BIOS I tried with GGXX was a 23605B (japan) and not a 23608A (export) as stated in my previous post.
I put the Naomi 2 back in its case but not the dimm board and now the setup works again. I'll leave it that way.
P.S.: The BIOS I tried with GGXX was a 23605B (japan) and not a 23608A (export) as stated in my previous post.
I’ve got a similar issue with an N1 with no video or audio. And without schematics it’s pretty tough to work these issues out. Hell I can’t even find a pinout for the bios chip. I’ve reflowed all the chips except what is under the hsf and heatsink and recapped the whole board. Not sure what else to do without schems.
channelmaniac
Professional
BIOS is a 16Mb chip... Similar pinout to the M27C160 EPROM from ST Microelectronics.
Casselfornia
Student
Sounds like bga issue. Bios traces look good?
Yeah, I don't see any physical issues with the board. All the chips are receiving 5 and 3.3v but they just aren't getting hot. And the 2 heatsinks aren't getting warm either. The board acts like it should be on, but nothings happening. Full recap and full reflow and still nothing. After replacing the super cap I got hum in the speakers again as if they were gonna turn on, but that's all. So yeah, all I could think of was either the gpu or the cpu at this point. Depending on the amount of the bga needing reballing I do have the tools to do it. Also helps if there is a stencil for it.
channelmaniac
Professional
Make sure the fan on the motherboard is good and spinning. The Naomi won't boot if the fan isn't spinning properly. Also look closely at the supercap next to the battery. If it looks oily on the PCB around it or if its solder joints look dull or crusty then it is leaking. That electrolyte will damage the traces under the 8 pin EEPROM socket first then spread out to the 32k x 8 battery backed RAM (IC29, IIRC) and / or under the BIOS socket, depending on how the board is mounted in the cab.
chacal231077
Grand Master
Hi! 
I can't find the RAM (IC106 and IC107) on my Naomi 1 motherboard
Is this Ram location only on Naomi 2
Thanks You
I can't find the RAM (IC106 and IC107) on my Naomi 1 motherboard
Is this Ram location only on Naomi 2
Thanks You
StormyNormy
Student
Hi all,
Can I use any SCSI cable to connect the DIMM board with the GD-Rom drive or is the wiring for the Naomi special?
Are there any known compatibility issues between Naomi BIOS and DIMM firmware version (e.g. BIOS ver. X does not work with DIMM fw. ver. Y)?
Thanks.
Can I use any SCSI cable to connect the DIMM board with the GD-Rom drive or is the wiring for the Naomi special?
Are there any known compatibility issues between Naomi BIOS and DIMM firmware version (e.g. BIOS ver. X does not work with DIMM fw. ver. Y)?
Thanks.