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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Damion on November 30, 2007, 04:07:08 AM
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Hi all,
Does anyone know where I can find a schematic for this board? I'm trying to find the value of a surface-mount resistor on the back of the board (underside of Alice), at location "E127R."
Any help/comments are much appreciated. (Yes, I fux0red my mobo :boohoo:)
Damion
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OK... I translated this from Russian:
"Reasonably known problem ESCOM-овских of cars (on Commodor-овских it practically was not shown). Strips appear near to colors, in RGB which is established 23 bat and more. It is treated as follows: it is necessary to short-circuit resistor E127R and to clean condenser E127C. Hаходятся on HИЖHЕЙ to a side of a payment, about under chip Alice. If you are not inclined to consider yourselves reasonably qualified for such operation, address to someone to more skilled is better."
:lol:
I've verified this from a few other sources, so (hopefully) it's safe to remove the resistor and bridge the pads.
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Can anyone translate the translation? :-? :-?
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BTW: Ian Stedman have the fixes for this version of M/B in his site.
Reach it here! (http://www.ianstedman.co.uk/Amiga/amiga_hacks/A1200_Mobo_fix/a1200_mobo_fix.html)
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rkauer wrote:
BTW: Ian Stedman have the fixes for this version of M/B in his site.
Reach it here! (http://www.ianstedman.co.uk/Amiga/amiga_hacks/A1200_Mobo_fix/a1200_mobo_fix.html)
Thanks! Actually, after some further inspection, E127R seems to be OK. I repaired a burned trace on the motherboard (verified continuity between all associated areas), and also replaced a poor resistor on the top of the board. I can't find any other faults, but still no dice. The board works fine except for IDE -- no drives are recognized by the system, and the HD light stays constantly illuminated as long as a drive is plugged in.
At this point I am looking for a new mobo, but (when time allows) I will probably still try to find out what happened. Or, I may cannibalize it to repair my recent ebay acquisition that arrived with a b0rkened PCMCIA port (and the clockport pins on the wrong side).
At any rate -- this was a lesson learned the hard way for me. Even if you check something 4 times, DO NOT trust your judgment after two bottles of Germany's finest. Get some sleep and try again tomorrow. ;-)
cheers
Damion
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-D- wrote:
--ZIP--
The board works fine except for IDE -- no drives are recognized by the system, and the HD light stays constantly illuminated as long as a drive is plugged in.
--ZIP--
Congratulations!
You have a de-validated partition on your Miggy!
Just turn it on and wait for a couple of days (or hours, depending of the size of your hd) and, hey! Presto! you have a fully functional Amiga again!
But if you don't like to wait so much, give your Amiga to me! I have all the time of the world on my side :-D
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rkauer wrote:
-D- wrote:
--ZIP--
The board works fine except for IDE -- no drives are recognized by the system, and the HD light stays constantly illuminated as long as a drive is plugged in.
--ZIP--
Congratulations!
You have a de-validated partition on your Miggy!
Just turn it on and wait for a couple of days (or hours, depending of the size of your hd) and, hey! Presto! you have a fully functional Amiga again!
But if you don't like to wait so much, give your Amiga to me! I have all the time of the world on my side :-D
:pint:
Cheers rkauer, I appreciate your positive outlook!
Unfortunately, all partitions are PFS3, and I've already tried another drive, as well as my main one on a spare 2B board. There's definitely a fault in the IDE somewhere. (I'm pretty bummed, but at least all my expansions appear to be fine.)
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I have the schematics (really dunno if is for the board revision you have, but...)
PM to give meh your email adress and I'll send it to u in a snap!
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Cool, thank you! Might come in handy, hopefully I'll get some time to look at it again soon.
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Done!
I had to send the images 2 u in 4 emails (due the size restrictions on your server).
But it goes!
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OMtehG!!!11!!!!1
IT LIVES!!!
Everything is working exactly as is was before, including my newly acquired Prelude card! SWEETNESS! :lol:
:pint: :pint: :pint:
Whew. I'll tell ya one thing... time for me to get a better soldering gun. Repairing tiny traces with a ghetto-azz radio shack iron is NOT teh fun stuff. :crazy:
(excuse the over-usage of emoticons, but I'm VERY hapy right now)
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So, what was wrong with the mobo?
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Two bad traces, one fried resistor, and one melted wire in an IDE cable (that took a while to figure out, since the cable looked OK from the outside).
I really thought it was toast, LOL.
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A TOASTER in an A1200 is a very rare sight! :-D