Piggyback 4164 to Diagnose Memory Fault

[Chris_68]

Hi

Send a photo of the damage, usually you can use a thin wire to make a new pad or track. Can be fiddly but worth it, if it works then secure with some epoxy.

[t0nyt]

Hi

Send a photo of the damage, usually you can use a thin wire to make a new pad or track. Can be fiddly but worth it, if it works then secure with some epoxy.

The forth leg down on the right has nothing to solder to, but I don't know if there was a track there previously or I've just stripped a ring from the board. I've made a right mess of the whole thing though really

[Chris_68]

Hi,

I can take a photo for you, its pin 4 right? If so it should be connected, test with multimeter if its connected to IC 10 and same pin. Could be that the tracks are on top layer.

[t0nyt]

Hi,

I can take a photo for you, its pin 4 right? If so it should be connected, test with multimeter if its connected to IC 10 and same pin. Could be that the tracks are on top layer.

The top of the image is the edge of the mobo, so I think bottom left is pin 1?

[Chris_68]

Hi,

Yes pin 1.
I had a look and it is connected on top layer, I would clean it up a bit and reflow using flux.
Measure so you have connection to IC12 pin 13 ( and the others)

[t0nyt]

Hi,

Yes pin 1.
I had a look and it is connected on top layer, I would clean it up a bit and reflow using flux.
Measure so you have connection to IC12 pin 13 ( and the others)

Just checked and I have continuity across pin 13 to IC12 & other chips

Thanks

[t0nyt]

Well I went from this error message, and booting ok

IMG_3635.jpeg (23.42 KiB) Viewed 424 times

Now I have this and it hangs

Scrap box?

[t0nyt]

Well I went from this error message, and booting ok

IMG_3635.jpeg


Now I have this and it hangs

IMG_3637.jpeg


Scrap box?

I ran those numbers thru ramfail_bas, out of interest, and it crashes with a bad parameter

[t0nyt]

Well I went from this error message, and booting ok

IMG_3635.jpeg


Now I have this and it hangs

IMG_3637.jpeg


Scrap box?

I ran those numbers thru ramfail_bas, out of interest, and it crashes with a bad parameter

I ran the address thru ramfail_bas again, but this time using the write/read values from the first message rather than FFFFFFFF for both, and it reports IC3 which is directly above IC11 so will take another look at the circuit board to see if I can see where I might of gone wrong

[Chris_68]

Do you have more than standard memory?
Check pcb, I had similar result indicating different ICs from time to time. For me it was logic circuitry.