Hi,
I recapped 2 SE/30 around 2 months ago. One of them still works fine, while the other has developed some weird problems. First, I notice that during operation, the PAL and video chips above the 8 SIMM memory slots are very hot, to the point of burning my hands. Secondly, the machine works fine with the original Apple ROM but not with the Macintosh Rominator II ROM (by BMOW) - it would show various stripe patterns or play the chime of death upon boot up. Finally, if left running for a while (30-60 mins) then the machine would no longer boot up with either ROM (chime of death is played). If this happens I will need to wait for a few hours before it will work again.
I have washed the board again the second time but the symptom does not change. The other SE/30 which was recapped around the same time still works well. This is the list of what I have done to this SE/30, in case they are related:
1. Install 128MB of RAM (purchased from OWC)
2. Install the Mac Rominator Kit II from BMOW. The custom ROM worked fine at first, and only started to show the above problem yesterday.
3. Adjust the trimmer on the analog board for the CRT vertical width to better fit the screen as the original display is a bit small.
I am well aware of the overscan design of the original Mac, to make the screen WYSIWYG with 72 dpi printout, hence I still leave some black borders at the top and the bottom. With this, the new CRT image did not fit the screen entirely, just that it was bigger compared with the original display.
Any ideas what is the problem and how should I debug it? I suspect there is a short somewhere on the board which results in the ICs getting hot and failing as the temperature increases. Are those PAL and video chips also hot on your SE/30 board?
If it helps, a few days before this happened and after I adjusted the CRT trimmer, I started to observe that the CRT would sometimes shrink slightly or shake shortly after power on, but it would stop doing so once the machine had warmed up. I attributed this to the old analog board, but after checking the voltage rails all look good (12.57V, 5.02V) with only 60-70mV ripple, which are acceptable.
Let me know what you think.
PS: I accidentally broke the CRT neck tube this afternoon when trying to adjust the trimmers on the analog board. The CRT is now trashed and I had to test the logic board using another Mac SE CRT, but that's a different story.
I recapped 2 SE/30 around 2 months ago. One of them still works fine, while the other has developed some weird problems. First, I notice that during operation, the PAL and video chips above the 8 SIMM memory slots are very hot, to the point of burning my hands. Secondly, the machine works fine with the original Apple ROM but not with the Macintosh Rominator II ROM (by BMOW) - it would show various stripe patterns or play the chime of death upon boot up. Finally, if left running for a while (30-60 mins) then the machine would no longer boot up with either ROM (chime of death is played). If this happens I will need to wait for a few hours before it will work again.
I have washed the board again the second time but the symptom does not change. The other SE/30 which was recapped around the same time still works well. This is the list of what I have done to this SE/30, in case they are related:
1. Install 128MB of RAM (purchased from OWC)
2. Install the Mac Rominator Kit II from BMOW. The custom ROM worked fine at first, and only started to show the above problem yesterday.
3. Adjust the trimmer on the analog board for the CRT vertical width to better fit the screen as the original display is a bit small.
I am well aware of the overscan design of the original Mac, to make the screen WYSIWYG with 72 dpi printout, hence I still leave some black borders at the top and the bottom. With this, the new CRT image did not fit the screen entirely, just that it was bigger compared with the original display.
Any ideas what is the problem and how should I debug it? I suspect there is a short somewhere on the board which results in the ICs getting hot and failing as the temperature increases. Are those PAL and video chips also hot on your SE/30 board?
If it helps, a few days before this happened and after I adjusted the CRT trimmer, I started to observe that the CRT would sometimes shrink slightly or shake shortly after power on, but it would stop doing so once the machine had warmed up. I attributed this to the old analog board, but after checking the voltage rails all look good (12.57V, 5.02V) with only 60-70mV ripple, which are acceptable.
Let me know what you think.
PS: I accidentally broke the CRT neck tube this afternoon when trying to adjust the trimmers on the analog board. The CRT is now trashed and I had to test the logic board using another Mac SE CRT, but that's a different story.
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The same machine will only be turned on again once in a while for testing. I don't feel like opening a working Mac to tinker around, for there is always a risk that I would mess something up. But if I don't play with them, it will be sitting there doing nothing.
