I want to understand - Macintosh Portable error code

[plb007]

Hi,

I just bought and recap (+ultrasonic cleaning, drying) a non-backlit Macintosh Portable and get an error code when starting.
I got the chime, but the a continuous beep and the sad mac's chime.
Error code are : 00000003 / 0000FF00
I tried to understand what are those code but cannot decode them.
I tried to find some explanations regarding data line and address line but still can't understand those informations posted here
Video of booting is here :

 

[Johnnya101]

Just wondering, are you using the correct original charger that has been tested to be good AND a brand new good battery? Without those two things, you wont get very far.

 

[plb007]

Hi, I checked the original charger (I have two of them). The one I'm using is giving me 7,4V - I assume is correct.
It's a replacement battery that looks in shape. Can a bad battery cause those errors code ?
Thanks,

 

[3lectr1cPPC]

I'll bet this isn't the issue since portables are so problematic, but if you haven't already, try removing any RAM upgrade cards if present. It might be crashing on the RAM test.

 

[plb007]

Hi, The portable acts the same with or without the extra ram card.

 

[Plottem]

Hello, I have exactly the same error on my portable, did you manage to solve it? All the best

 

[NightlyH]

Same error on mine as well. Appears to be an issue with the ram's upper bits.

 

[Sideburn]

Same here but mine is 00000003 000000FF

 

[tronlives2]

Same here but mine is 00000003 000000FF

Same for me.

 

[wymtb]

Would bet there is at least one bad trace under one of the ram chips. I fixed such an issue with bodge wires on one of my boards and as far as I remember the error code was comparable. Try to find the broken trace with a continuity tester.

 

[Sideburn]

Thanks I will go through the board and see what I can find.

 

[plb007]

Would bet there is at least one bad trace under one of the ram chips. I fixed such an issue with bodge wires on one of my boards and as far as I remember the error code was comparable. Try to find the broken trace with a continuity tester.

View attachment 63362

Hi, does the 8 columns (x4 rows) of memory module should be wired in parallel ? If so, I have many broken trace each occurring between the 4th and 5th column.

 

[SuperSVGA]

Hi, does the 8 columns (x4 rows) of memory module should be wired in parallel ? If so, I have many broken trace each occurring between the 4th and 5th column.

The upper 4 rows (B,C,D,E) are connected to data bits 0-7, while the lower 4 rows (F,G,H,J) are connected to data bits 8-15.