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Posted by: Paralel on 2015-12-12 13:16:58 Your only solution is to either go trace-by-trace looking for the break, or replace it piece-by-piece until you find the piece that is broken.
Posted by: Sinclair on 2015-12-12 13:57:43 OK. The first thing is to know where to start. First I think that it should checking the VRAM and its route until the video signal generated which goes to the analog Board. For this it is essential the schematic. These are public domain?
Posted by: Paralel on 2015-12-12 14:14:54 Nope, no mac schematics are public domain. However, you may still be able to find them online. The guy that used to make them de novo has since retired, so that route is closed.
Posted by: Sinclair on 2015-12-12 14:33:39 Wow, you say words that my translator is not able to interpret 🙂 You say that exist schematics for the network and there is nothing domain public, then I understand that for consult these schematics is necessary to pay. It is possible that my difficulty in interpreting certain colloquial phrases in English are fact that misunderstood the meaning of them. Please tell me if.
Posted by: Paralel on 2015-12-12 17:18:28 Well, your translator was close. You may be able to find them online, though they would obviously be illegal copies. The guy who made new schematics for macs retired (is no longer working). Hopefully your translator will get my new phrasing. I would imagine it choked on de novo, that's because its not English, its Latin (the dead language). It means from scratch, or starting new. If I'd known you were using a translator, I would have used easier to translate wording.
Posted by: Sinclair on 2015-12-12 23:11:01 Thank you. You're very kind, but still its second sentence is incomprehensible. Words like "Novo" are not recognized in your language or in mine, both languages, by the way, daughters of Latin. The schematics which you mean should be these: http://www.maccaps.com/MacCaps/Schematics.html
Posted by: Paralel on 2015-12-12 23:26:55 Yep, the only difference, if I'm not mistaken, is that your version is 220v, not 120v. There tend to be a few differences on the analog board between 220v and 120 volt versions, but the logic board should be the same.
Posted by: bibilit on 2015-12-13 00:16:00 Where are you based ? from what i can see in the pictures above probably from a country speaking Spanish. Your best try will be to find someone around having a working unit to compare with. I have got dome schematics i can send to you if required, send me PM with a valid email.
Posted by: Sinclair on 2015-12-13 00:24:41 Thank you. I'm spanish and these Macintosh here are scarce, therefore making it very difficult to access another logic board to compare. I'll has send a PM.
Posted by: falen5 on 2015-12-13 09:16:33 hi Sinclair - im in Ireland and if you post over the board id be glad to test it out for you. I have many macs and a few spares - don't want any money for it - gladly do it for free - you just cover postage over and back of just the logic board - Something you can test yourself is the continuity test on UE8 from each pin to the first via's you find. Do the same for UC8,UD8,UE8,UF8 - ive seen many boards, allot of dust.......but WOW.....that was the most dust covered board ive ever seen - cheers
Posted by: Sinclair on 2015-12-13 11:42:37 Thank you falen5. I'll take your word for it!
Posted by: uniserver on 2015-12-14 17:58:44 I doubt the issue is related to UE8 in this situation, I never even thought to click on this thread due to title, op pm'ed me wanting to buy a ls166, I mean no problem I have a roll of hc166's . But I think mike is right on the money with a screwed up pal. Too bad on this darn revision they are soldered down, other revisions has them all in sockets .
Posted by: uniserver on 2015-12-14 18:01:36 I find the more dusty the less eaten by leaky cap goo, dust acts like a wick. That darn se30 has seen some hours. I would say that one probably paid for it's self for sure.
Posted by: Sinclair on 2015-12-14 23:15:19 ...a screwed up pal. Too bad on this darn revision they are soldered down, other revisions has them all in sockets . Thanks for the reply. Desoldering is no problem for me. Tell me please only the component(s) that you suspect and I can move forward.
Posted by: uniserver on 2015-12-15 00:27:02 https://68kmla.org/forums/index.php?/topic/22545-macintosh-se30-killed-by-a-mouse/page-2 similar issue on this thread.
Posted by: uniserver on 2015-12-15 00:40:14 falen5 is fairly near you there in ireland. maybe you can message him and buy a parts board off em or something? I have seen pals go bad a few times… but its not super common, i would say its more common for UE8 issues or VRAM issues… And i don't think you have issues with either of those, concerning your current issue. maybe the parts board you can get has good pals?
Posted by: Sinclair on 2015-12-15 00:54:00 Thanks for the information. Although there are parts of your response that I am not able to translate. When you say "pal" would you tell PAL (part)? The translator tells me that this word means 'friend' I do not understand what I want to ask this: falen5 maybe the parts board you can get has good pals? Sorry for the inconvenience.
Posted by: uniserver on 2015-12-15 01:22:19 the only way to obtain some would be from a parts board, and they are the I/C's marked by arrows in the image i posted.
Posted by: Sinclair on 2015-12-15 01:28:20 OK. I understand. I guess that these PAL are not known their equations and it is impossible to replace them in another way.
Posted by: uniserver on 2015-12-15 01:31:22 correct they are special chips, that are proprietary to apple.
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