-
Hello MLAers! We've re-enabled auto-approval for accounts. If you are still waiting on account approval, please check this thread for more information.
please look at this sadmac error code!!
- Thread starter gooddi
- Start date
i found some trace on the back side of board.
that looks like someone had tryed to resoldering or replace ram.
but every ram has thext "4264" with apple mark.
so i thought someone had tried to resoldering every ram.
1. back side of the board.
2. screen with sadmac
that looks like someone had tryed to resoldering or replace ram.
but every ram has thext "4264" with apple mark.
so i thought someone had tried to resoldering every ram.
1. back side of the board.
2. screen with sadmac
Last edited by a moderator:
thanks for comment.
as i know f11 ram failue code is "040040" right? this is same with "04006c"?
and i can't boot with floppy because the sadmac !
thanks for reading.
all bad ram?? you mean i have to replace all of them?
i can replace the ram with new one, but i don't have enought to replace all of them.
no charge grandpa? <--- i can't understand this sentence.
thanks
The "006c" is the chip location, so changes are its F11 + the one next to it.
A"4264" is a 4164 DRAM Chip. Back then they were sensitive to static and heat (compared to today's chips, they are quite robust), so chances are I'm guessing that who ever soldered the board left too much heat to the chip.
But since you say somebody soldered the board, check to see if traces are shorted with a magnifying glass. One hair-thick sliver crossing 2 pads will will a board.
When I replace RAM on a board, I usually replace the whole set.
A"4264" is a 4164 DRAM Chip. Back then they were sensitive to static and heat (compared to today's chips, they are quite robust), so chances are I'm guessing that who ever soldered the board left too much heat to the chip.
But since you say somebody soldered the board, check to see if traces are shorted with a magnifying glass. One hair-thick sliver crossing 2 pads will will a board.
When I replace RAM on a board, I usually replace the whole set.
Last edited by a moderator:
thanks for your comment.
ok. first thing i have to do is replace "F11" and "F12" with new one?
I looked at your pics (it did not load the first time I posted but that is on my end).
Sad news. Looking at the bottom board, I saw several of the solder joints from the capacitors and RAM with a dull grey ring on them. That means that the solder joint is cracking (similar on the Analog board but a lot smaller because of the joints being smaller). Its an intensive job to do on ALL of the chips/connections of the area- Desolder And Clean All The Joints AND THEN Put In Fresh Solder And Flux! Reheating the joint will only work for a short time and the board will go bad again months down the road.
And like Uniserver said, Artifacts on the screen means that all the RAM is bad. Chances are I'm guessing is that the cracked solder joints on the board are affecting all the RAM on the board. It is better to let an expert look at it. Like I said, giving the chips too much heat while the board being resoldered will kill a RAM Chip. I suggest letting Uniserver to look at it. He knows his Mac repair well.
That board is an early Mac 128K as is has a Ceramic 68000 and not a plastic one.
Sad news. Looking at the bottom board, I saw several of the solder joints from the capacitors and RAM with a dull grey ring on them. That means that the solder joint is cracking (similar on the Analog board but a lot smaller because of the joints being smaller). Its an intensive job to do on ALL of the chips/connections of the area- Desolder And Clean All The Joints AND THEN Put In Fresh Solder And Flux! Reheating the joint will only work for a short time and the board will go bad again months down the road.
And like Uniserver said, Artifacts on the screen means that all the RAM is bad. Chances are I'm guessing is that the cracked solder joints on the board are affecting all the RAM on the board. It is better to let an expert look at it. Like I said, giving the chips too much heat while the board being resoldered will kill a RAM Chip. I suggest letting Uniserver to look at it. He knows his Mac repair well.
That board is an early Mac 128K as is has a Ceramic 68000 and not a plastic one.
Last edited by a moderator:
yes all of the ram is bad… its all no good.… you can screw around and replace one or 2… only 6 months later to have another one or two go bad...
that ram is is the worst. the apple logo'd micron is bad… and yes, that board has already had some ram replaced, but with the same junk that goes bad.
i go through and replace all the ram with good Samsung ram.. and problem wold be permanently solved.
as i said its a big nasty job, i have recently lowered my price for this job.. and its a big nasty job.. but has to be done… there really is no other viable solution.
that ram is is the worst. the apple logo'd micron is bad… and yes, that board has already had some ram replaced, but with the same junk that goes bad.
i go through and replace all the ram with good Samsung ram.. and problem wold be permanently solved.
as i said its a big nasty job, i have recently lowered my price for this job.. and its a big nasty job.. but has to be done… there really is no other viable solution.
McD replaced my ram and it changed nothing then changed it back since it was the apple branded ram for me, which as a 128 is kinda cool for me. I have 2 working 128's but both upgraded to 512 on true 128 boards. Was just trying to get a good 128 board together and it matches one case I have.
Im not gonna hijack the thread but nothing has been done or changed since my thread on it. Just wanted to fyi the issue as those artifacts were the factor that did not change as ram was replaced.
Im not gonna hijack the thread but nothing has been done or changed since my thread on it. Just wanted to fyi the issue as those artifacts were the factor that did not change as ram was replaced.
yep. its very nasty job. right.
i replasced 4 ram F11, F12, G11, G12.
i did use new HM4864P-3 ram. it had worked before on my another 128k board.
and nothing was changed. it still show me "04006c".
as your comment all of them need to be replaced to clean things.
i hope you see this board but i live in sought korea and it may be expesive. (shipping cost.)
but if you tell me the cost for replacing or fixing cost, i'll consider it positively.
thanks for your kind again.
Last edited by a moderator:
it could also be the 74ls244's all the ram is connected to, When i assembled and installed a MacGusto II upgrade board onto one of my 512k boards i got something similar and the install guide pointed to one of the 74ls244's being bad (in my case this turned out not to be the problem, it turned out i had a short under one of the ram ic's) So if replacing the ram doesn't fix it try swapping the 74ls244's
