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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...

thanks for your comment. ok. first thing i have to do is replace "F11" and "F12" with new one?

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

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.

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

hello. today i got a 128k logic board. but it came with sad mac code "04006c". when i turn it on i heard bong and that code came up. i had serched the code through internet "google", but anything i found same my code! please help me to solve problem. thnks for reading.

i need to be acclimatize to this site, i can’t understand the method for replying to someone’s comment. -_- ;;

yep. i did check the voltage of floppy port,  and adjust voltage lever, but nothing was changed. when i had made a screen brighten, the tik sound was going up. i will check the coil as your comment. thanks. yep. i did check the voltage of floppy port,  and adjust voltage lever, but nothing...