JJ-108 V02 Single Board Computer Jumper Identification and Troubleshooting \ VOGONS

JJ-108 V02 Single Board Computer Jumper Identification and Troubleshooting

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First post, by whitepawn

Posted on 2021-03-11, 15:28

whitepawn Offline

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Rank: Newbie
Posts: 57
Joined: 2021-02-25, 21:57

Hi,

Lately i bought an unknown SBC from a local seller with RAM and CPU.Let me explain repairing story of this board and my problems:

3.jpg

First i cleaned the board and inspected it.SIS Chipset(85C460ATQ) was seemed a little bit shifted from it pads but i checked with multimeter random pins and no shorts so i decided to power it on with my POST card and DIY ISA backplane but post card reported no-c and no CLK signal which i wasn't expected.

After fiddling around board i discovered if i push SIS Chipset from top, POST card outputs some random bytes and CLK and RST led was blinking randomly.It was obvious that SIS chipset has contiunity problems.I was already suspected it.

Then i decided to remove chipset using hot air and soldering iron.Removed chip and cleaned PCB contacts with copper wire and aligned chipset pins with PCB.

Soldered it back and now i have some output on post card without pushing Chipset to PCB 😀 It seemed stable.POST card outputs 13/12 which seemed RAM problem to me and installed 4 RAM modules which originally came with board and bingo it posted.

1.jpg

2.jpg

Post Sting is:
"40-0102-001796-00101111-1212910-J&J"
and
"40-0102-001796-00101111-1212910-SISAUTO-H"

So here is my questions:

DALLAS RTC battery is long gone however it asks me a rom password (When i try to get inside bios) which i don't have a clue what is it. I can't boot 3-1/4 floppy because i can't enter bios.Are there any way to reset it?

Board doesn't have any markings on it.I inspected carefully but no luck.Only markings it have is "JJ-108 V02" and "CY-02 94V-0" could someone identify this board?

4.jpg

Full photos are available in my dropbox folder:

https://www.dropbox.com/sh/zceguul61ec2uax/AA … uo9gaIKFGa?dl=0

Thanks for help in advance.

Last edited by whitepawn on 2021-07-24, 10:26. Edited 2 times in total.

Reply 1 of 4, by weedeewee

Posted on 2021-03-11, 15:50

weedeewee Offline

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Posts: 2989
Joined: 2021-01-31, 16:09
Location: Belgium

just wondering if this might be of any use... https://www.computerhope.com/issues/ch000451.htm

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !
https://www.vogonswiki.com/index.php/Serial_port

Reply 2 of 4, by whitepawn

Posted on 2021-03-11, 20:24

whitepawn Offline

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Rank: Newbie
Posts: 57
Joined: 2021-02-25, 21:57

Yes "AMI" password worked flawlessly thank you but Dallas RTC battery is dead so i need to retrofit CR2032 to it because it doesn't save changes and still not able to boot from A:
I dig internet for information and found out similiar board which is JJ-109 so i believe manufacturer of this board is "J & J TECHNOLOGY, INC" are there any contact info of this company or they are long gone?
Here is the similiar board.I have checked jumpers but completely different layout and labeling.

https://www.pcrebuilding.altervista.org/45/26 … +BOARD+486.html

I will edit topic subject to JJ-108 V02.I will share retrofitted RTC photos if anyone interested.

Reply 3 of 4, by PC Hoarder Patrol

Posted on 2021-03-12, 01:56

PC Hoarder Patrol Offline

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Posts: 2107
Joined: 2018-03-04, 19:59

whitepawn wrote on 2021-03-11, 20:24:
Yes "AMI" password worked flawlessly thank you but Dallas RTC battery is dead so i need to retrofit CR2032 to it because it does […]
Show full quote

Yes "AMI" password worked flawlessly thank you but Dallas RTC battery is dead so i need to retrofit CR2032 to it because it doesn't save changes and still not able to boot from A:
I dig internet for information and found out similiar board which is JJ-109 so i believe manufacturer of this board is "J & J TECHNOLOGY, INC" are there any contact info of this company or they are long gone?
Here is the similiar board.I have checked jumpers but completely different layout and labeling.

https://www.pcrebuilding.altervista.org/45/26 … +BOARD+486.html

I will edit topic subject to JJ-108 V02.I will share retrofitted RTC photos if anyone interested.

Found JJ-109 in the archive, but no sign of JJ-108

https://web.archive.org/web/19980125130929/ht … com:80/1a25.htm

Not sure if they're still in business but the website is

http://www.jjtech.com