Do you have a hot air station/gun? Removal is easy with a hot air gun.
I wouldn't socket it, that's just going to create another potential weak spot.
The ASC is a custom Apple chip so not easy to find replacements for.
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Macintosh SE/30 M5119 - Restoration
- Thread starter GreenBar0n
- Start date
I wouldn't socket it, that's just going to create another potential weak spot.
The ASC is a custom Apple chip so not easy to find replacements for.
Thanks! I do have the standard Yihua 959D. But UE10 is surrounded by those new tantalum caps. I do have kapton tape and foil.
If I'm going to remove UE10, I really need better magnification, and it doesn't come cheap. Might have to wait until I can fix that.
Instead of going with a desk mounted AmPro for $600+, I'm trying a $139 Amazon one, it should be here in the next couple of hours, with same day delivery.
https://www.amazon.com/Andonstar-AD246S-M-Microscope-Biological-Compatible/dp/B09VPPS96M
https://www.amazon.com/Andonstar-AD246S-M-Microscope-Biological-Compatible/dp/B09VPPS96M
Got the new scope, might take some getting used to, there's a disconnect between the eyes and hands having the screen remote - just feels weird at the moment. Looks incredible though, now that I can see what I'm doing.
Will practice getting my hands and eyes to agree on this, and then remove the VLSI chip - without ruining any traces, hopefully.
Will practice getting my hands and eyes to agree on this, and then remove the VLSI chip - without ruining any traces, hopefully.
Taped off UE10.
Working up the courage to do this, now that things are in order.
Working up the courage to do this, now that things are in order.
As soon as the hot air flowed, the kapton tape lifted, and then the foil got in the way.
Removed the kapton tape and foil, used the square nozzle for the hot air, flooded UE10 with flux, and set the Yihua 959D to 400°C, with a fan speed of 7. Took about 2 minutes and kept bumping it with tweezers, until it loosened and came off.
The microscope didn't help with using the hot air, it gets in the way directly above it. But it does help, and I will be keeping it. Has video capture too.
There are three pads that will need to be fixed, or bodged.
We'll see what repairing this achieves in relation to the symptoms: no chime, simasimac.
Removed the kapton tape and foil, used the square nozzle for the hot air, flooded UE10 with flux, and set the Yihua 959D to 400°C, with a fan speed of 7. Took about 2 minutes and kept bumping it with tweezers, until it loosened and came off.
The microscope didn't help with using the hot air, it gets in the way directly above it. But it does help, and I will be keeping it. Has video capture too.
There are three pads that will need to be fixed, or bodged.
We'll see what repairing this achieves in relation to the symptoms: no chime, simasimac.
The three missing pins are 19, 20, and 35. Pin 35 is Vcc for UE10, and it was rotted off like UE8 was.
Need to manage my expectations, but this feels like I'm on to something significant here.
Need to manage my expectations, but this feels like I'm on to something significant here.
Thanks! I'm getting ready to check every pad and via connected to UE10, on both sides of the board, right now.
I wager you’ll get: chimes of death, simasimac. Why? Because the SE/30 will boot without an ASC. Let’s see…
Pin 22 is also broken.
This has to be done, might as well be now.
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Looks like TL071 and Q2 are also rotted.
What's TL071 and Q2 responsible for? Looking for them on the schematic now.
What's TL071 and Q2 responsible for? Looking for them on the schematic now.
Looks like UD12 is corroded and may have some bad traces.
UD12 is listed in the Serial and Sound schematic.
Will remove TL-071, Q2, and UD12 in order to check the traces and remove the corrosion.
UD12 is listed in the Serial and Sound schematic.
Will remove TL-071, Q2, and UD12 in order to check the traces and remove the corrosion.
TL071 is an audio amplifier and 26LS30 is a serial port line driver (an electronic circuit that amplifies a signal and drives it along a transmission line or cable)
SE/30 will not boot without ASC. I tried it on multiple boards. (simasimac)
26LS30 will not prevent a boot
TL071/Q1/Q2 issue will make you unable to hear the death chime if there's one from the speaker, they are audio amplifier/driver to drive internal speaker. Line-out jack should work fine without those.
26LS30 will not prevent a boot
TL071/Q1/Q2 issue will make you unable to hear the death chime if there's one from the speaker, they are audio amplifier/driver to drive internal speaker. Line-out jack should work fine without those.
Thanks for the info, I really appreciate it! So many sound chip problems on this board.
This is giving me hope, thank you!
I've looked this board all over, and there is no other corrosion near the CPU, RAM, ROM, or muxes. It was starting to worry me that fixing the ASC wouldn't cure the simasimac, or even have a chance of doing so; really glad to hear a missing/broken ASC can and will halt a boot.
I'm certain that these logic board problems were caused by the cap corrosion, the broken traces/areas of the board must be in those limited locations where the leaks occurred, which makes it easier to find the problem, visually. Having to find the problem with just a scope and meter alone, would probably not work out well for me even though I do have both, and an ancient lightweight electronics degree.
Will give it another go tomorrow night.
Thanks again for the info and reply guys!
Not according to my own testing
I had the ASC removed from a fully socketed Reloaded board last night and it booted up fine. It’s interesting that we’ve had different results on this.
Got UD12 removed. Was able to scrape the board traces, and solder the broken traces closed again, no bodge wire necessary. Will go over the bare traces with UV solder mask before installing the chip again.
Will have to run wires for the broken traces on UE10 pin 19, 20, and 22, like I did with Pin 35, the trace gap is too large to fix these with solder only.
Will have to run wires for the broken traces on UE10 pin 19, 20, and 22, like I did with Pin 35, the trace gap is too large to fix these with solder only.
