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Macintosh Portable error code
- Thread starter bibilit
- Start date
RAM.
Not entirely. it isnt easy at all, and its very painstaking swapping one chip out at a time.
However....
Sometimes the traces get broken going to the RAM ICs, so i would grab a magnifier and check all the connections going to the RAM. I will dig up the schematics and post the sheet on the RAM section which may help.
if an IC itself is bad, only fix is to swap them one at a time until you find them, or replace them all.... it sucks. Been there, done that.
However....
Sometimes the traces get broken going to the RAM ICs, so i would grab a magnifier and check all the connections going to the RAM. I will dig up the schematics and post the sheet on the RAM section which may help.
if an IC itself is bad, only fix is to swap them one at a time until you find them, or replace them all.... it sucks. Been there, done that.
I had a RAM issue on one board.. check legs particularly where there was leaky caps... they sometimes ruin the traces there... make sure you rinse and clean the ram with 90% alcohol and a toothbrush to get all the electrolytic goo out from under the chips.. give it a wash in the tub and a scrub with the toothbrush and the 90% rubbing alcohol... then dry well with a hairdryer..
SOLVED
Thanks to TechKnight for pointing at the right direction, and with the help of the schematics he supplied to me, i spent a whole morning checking continuity... until almost the last chip, where i lost continuity on one of the legs.
Removed the chip, and
removed the last chip also, cleaned the area, put them back again and soldered a bridge where the trace was gone.
Not my better job, but anyway, put all back together
Up and running again.
Thanks to TechKnight for pointing at the right direction, and with the help of the schematics he supplied to me, i spent a whole morning checking continuity... until almost the last chip, where i lost continuity on one of the legs.
Removed the chip, and
a broken trace !
removed the last chip also, cleaned the area, put them back again and soldered a bridge where the trace was gone.
Not my better job, but anyway, put all back together
Up and running again.
Last edited by a moderator:
Bravo .
Yep, i have repaired a few like that. I think the 9V battery leaks and causes this.
