NAOMI bought on UK eBay - probably broken :(

OldFoo · Post by **OldFoo** » Thu Sep 04, 2008 11:08 pm

Got the wire today. It's super thin, and i hope it's not too thin. If it turns out to be bad i have found a place in Denmark where they sell kynar wire.

If i have time tomorrow i will start working on the Naomi.

OldFoo · Post by **OldFoo** » Fri Sep 05, 2008 12:04 am

Sweet.

The one I fixed had a corroded platethru under the EEPROM. I scraped the platethru on the bottom, solder coated it, then soldered a jumper from it to the where the socket's pin was soldered in.

RJ

OldFoo · Post by **OldFoo** » Mon Sep 08, 2008 1:28 am

Konsolkongen wrote:Got the wire today. It's super thin, and I hope it's not too thin. If it turns out to be bad I have found a place in Denmark where they sell kynar wire.

If I have time tomorrow I will start working on the Naomi.

Hadn't heard from you. Wanted to check to see what you found.

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 2:15 pm

I used the wire to repair a Mega CD 1 that i broke when i had to remove the Bios chip. When i did that i cut 4 traces on the board. I could repair them with that wire i just got but since it didn't have any isolation i had to use all my "isolation tape" so that it wouldn't come in contact with other things. I think it turned out really well, the wires seem to hold but the Bios i replaced it with was from a MCD2 (i think) and it didn't work. When i started my MegaDrive in 60hz mode it said "This MCD unit is for use only i europe..." which is a good thing i guess. But when i changed to 50hz and powered on the screen was all black. So i think its a Bios problem and not the traces i repaired.

Anyway, about the NAOMI. Atm i think that i'm too tired to fix it. Also i don't want to use the 0.10mm wire that i got when i don't have much isolation tape left.

I have a JAP Saturn waiting for me at the post office that i have to pick up tomorrow that i have prepared a multi region mod for. I will probably install that tomorrow and at the same time i can take of the 8-pin socket on the NAOMI. I have other wires that are isolated but no where near as thin as the one i used on the MCD or your Kynar wire. If i believe i can fix it with the thicker wire i will go all the way tomorrow otherwise i need to purchase Kynar wire... Found a place in Denmark that sells modchips and such, that sells kynar wire for about 20$ incl shipping, dunno if thats expensive but it will have to do.

Too bad i have been so busy lately with modifying my other consoles, building arcade sticks and such. I don't want to rush anything, but i guess its too late for that anyway

I'll let you know tomorrow how it all turned out.

OldFoo · Post by **OldFoo** » Thu Sep 11, 2008 6:04 pm

I'm gonna wait till i get some of that Kynar Wire... :/

OldFoo · Post by **OldFoo** » Thu Sep 11, 2008 11:35 pm

Konsolkongen wrote:I'm gonna wait till I get some of that Kynar Wire... :/

Depending on where the damage is you might not have to solder directly to the Altera chip. On one I repaired it was simply a matter of connecting the pin of the EEPROM chip to the bottom side of the plated thru hole. The plate thru was bad on the top side of the board so I just jumpered from the pin to the bottom side of the hole.

Simply scrape the green coating off the board and solder right to that platethru. You can use slightly bigger wire there.

RJ

OldFoo · Post by **OldFoo** » Sun Nov 16, 2008 9:26 am

Hello,

I have the same problem : a naomi 1 without sound nor video.

It seems that my C29 is leaking but I didn't see any broken trace, I have tested traces between IC30 and IC31 and everything seems OK.

Do you any idea how I can repair this board ?

Thanks.

OldFoo · Post by **OldFoo** » Mon Nov 17, 2008 11:36 pm

If the traces between the EEPROM and the FPGA chip are good and the board is dead then it could be a lot of different things. Check the power supply section of the board (are the LEDs on?)...

If that's not it then a failure in one of many chips could cause it to act dead.

RJ

OldFoo · Post by **OldFoo** » Tue Nov 18, 2008 10:46 am

Yes, fans and leds are on.

Too bad, I will have to buy a new one. :smt009

OldFoo · Post by **OldFoo** » Mon Mar 02, 2009 10:20 pm

channelmaniac wrote:The EEPROM chip connects to the Altera chip as follows:

Pin 1 - Pin 12

Pin 2 - Pin 1

Pin 3 - Pin 37

Pin 4 - Pin 4

Pin 5 - Ground

Pin 6 - N/C (no connection)

Pin 7 - +5v

Pin 8 - +5v

Pay particular attention to pin 3/4 as they have a short trace to a plate thru where they move to the bottom of the board. Thoese plate thrus will get eaten.

Ok so its been a looooooong time since i asked about this but i just got time to try soldering on the NAOMI board. (And i didn't have any Kynar wire until last week...

http://i40.photobucket.com/albums/e236/ ... 1236032270

I only did pin 1-4 because i have no idea where to get 5V, ground is easy enough though...

Needless to say it didn't work with just pin 1-4. My soldering turned out pretty good on the Altera chip so thats a good thing

What options do i have if adding GND and 5V to the chip doesn't work either?

Sorry for the very late reply but i've been quite busy lately.