First post, by whitepawn
- Rank
- Newbie
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:
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.
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?
Full photos are available in my dropbox folder:
https://www.dropbox.com/sh/zceguul61ec2uax/AA … uo9gaIKFGa?dl=0
Thanks for help in advance.
