Nvm1 wrote:

Is it possible to check this with my multimeter on certain legs of the socket?

yes, power and ground are easy to find (opposite corners)

rasz_pl wrote:

Nvm1 wrote:

Is it possible to check this with my multimeter on certain legs of the socket?

yes, power and ground are easy to find (opposite corners)

Okay, that sounds promising. What corner is/should be ground and which one power? If I know which leg in relation to the keying of the cachechip is what I can probe them.

Nvm1, google the datasheet of your cache chips and you'll find the pinout.

Socket4 board?

Yeah you can read "socket 4" on the CPU socket if you pay real attention ^^

Anonymous Coward wrote:

Socket4 board?

Yes, it looks a bit like a TCM PCI58AL but the layout differs in alot of places..
And I only get a reading on the diagnostics card when I remove the RAM..

Either the empty Odin is causing this or the empty cache slots. Problem is that I can't find an external battery header which would solve one problem really easy.

Hi:

With a multimeter, test continuity between all of "pin14" on the dip sockets (without the cache chip) and the main ground of the board.
if all make the beep/buzz sound you are discover the "polarity" of the chip.

good luck. 😎

manuelink64 wrote:

Hi: […]
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Hi:

With a multimeter, test continuity between all of "pin14" on the dip sockets (without the cache chip) and the main ground of the board.
if all make the beep/buzz sound you are discover the "polarity" of the chip.

good luck. 😎

Thanks Manuelink64, will test it Friday evening. As soon as that is finished I am going to look into powering the RTC module somehow.

Still I find it strange that without cache, but with CPU, RAM, Keyboard and a working VGA installed I get no post codes on my diagnostics card.
The only way to get a code is by removing the RAM, then it is stuck at C1/bE

Should it not atleast give some codes with working FPM ram installed?

Edit:
I did test the cache module sockets, and they all have the orientation in the same way. The keying of the last slot is also incorrect 😠
I tried with 3 sets of known good FPM ram now, + cpu + vga card, but I cannot get it to boot/show any sign of life.

What else can cause this? The diagnostics card only gives numbers if I remove all RAM from the system...

Just discovered a bent ISA pin that touched another pin, no more time to straighten it but will test tomorrow further.

Different approach, try to find the 5VDC (or VCC) pin on all socket.

Good luck! 😊

manuelink64 wrote:

Different approach, try to find the 5VDC (or VCC) pin on all socket. […]
Show full quote

Different approach, try to find the 5VDC (or VCC) pin on all socket.

Good luck! 😊

Thanks Manuel, I figured out the orientation already with your last tip.
And I just fixed the bent ISA pin but putting an old credit card between it to bend it back and then push it with my plastic spatula back in shape.
I found a broken resistor at the edge of the board, gonna solder a replacement in and then try again!
The isa post card now gives codes, so I am on the right way! 😀

Up to the next update on this weird board..

Nvm1 wrote:

Thanks Manuel, I figured out the orientation already with your last tip. And I just fixed the bent ISA pin but putting an old cr […]
Show full quote

Thanks Manuel, I figured out the orientation already with your last tip.
And I just fixed the bent ISA pin but putting an old credit card between it to bend it back and then push it with my plastic spatula back in shape.
I found a broken resistor at the edge of the board, gonna solder a replacement in and then try again!
The isa post card now gives codes, so I am on the right way! 😀

Up to the next update on this weird board..

You're welcome! 😎