Recent content by 68030@16mhz

Issue found . The Sony sound ic (that also holds the reset functions) is dead . I scoped out the cpu, it was stuck in reset . Using the scematics, we found the Sony ic holds reset functions . Anyone know a replacement or compatable ic ?

so what happened here is , my macintosh se wold only display garbage on the screen , the reset will not do anythng . i belive it is a reset issue . anyone  know / have the reset diagrams for a 2x 800k fdd w/ 20mb hdd ?

update . i got it to work ish . i found ut if i press the ic ug8 , it will work . so my dad replaced ir , and same thing . we belive its a broken trace going under ug8.

and yes i have 2 boards , one we bought , the other had sat in my parents house for 15+ years in a hot texas attic . the battery exploded in that one ( we also cleaned and recapped that one with a little change a chime and simasimac of death . but my dad put in around 25$ for some surface mount...

ok , i could try that , but i have a update  my dad is getting a scope . just for my collection of macs needing repair  . i will post a update when anything happens .  and i did wash the board with rubbing alcohol . but i have  asked my farther for his opinion on a gentle wash .  but...

well , my dad didn't wash the board , that s a motherboard suicide . it would de laminate the board and ruin pads . we just got q tips and 100% rubbing alcohol . as i  said , same symptoms . plus ,  wouldn't spend a penny to send it to a person who can "fix it" , that would cost hundreds of $ ...

i said  , old caps removed , cleaned , and new caps installed . with same symptoms . 

well over time i have seen and bought very interesting things from goodwill , heres what i have so far .... 1 a in box ibm pc jr needing new ram , never used for 40 $ 2 a mac lc 3 intact laying in a bin for 15 $ works great , had a lt of games on the hdd :D 3 a fully working rev a apple ii...

yes , it was originally a se/30 but downgraded it to a se , why , i was never able to get a working se/30 . and i have  looked at the psu and crt , its a little burned in . yes the se board i was able to get to work in the ebay se/30 for some reason . and yes my dad redid the smt caps and...

then again , if you wanted to do that , you could put the motherboard in a se/30 (ive done this to my se/30) it  will work fine if you have extra se/30s

so i bought this se/30 on ebay , it was working when i got ti , when i first powered it on , it showed a fine line on the screen , but after a fer times restarting the thing , it booted . so at that , i took out the battery , and put it into a restored se shell with good psu and crt ect . i put...