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Apple's 8bit Video Nubus Card Causing Death Chimes▸
Apple's 8bit Video Nubus Card Causing Death Chimes
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Apple's 8bit Video Nubus Card Causing Death Chimes
Got a good one for you guys...
I have an Apple's 8bit Video Nubus Card, which gives the standard 640X480 @ 256 color video from one of my IIci/cx. It needed a recapping and I gave one. 9 caps in total - 6 22µf and 3 47µf caps.
The thing with the card is this, when put into a Mac II (IIcx/ci/fx and so on) there is no video then you turn it on. Just a blank screen. After a few seconds where it should give a Happy Mac of Flashing "?" in a Disk Icon, it gives the chimes of death.
The Macs tested with other video cards work fine before and after the testing of this particular card.
Giving a recap should have fixed this card, it didn't. Traces look OK but I broke a trace on a 47µf cap forcing me to give it a pig tail repair to fix the trace. Same symptoms still occur.
Fixable? What's shorted out? I think its holding down the 5V line which RAM needs to pass a Memory Test Boot Sequence which the Death Chimes says it is failing.
I have an Apple's 8bit Video Nubus Card, which gives the standard 640X480 @ 256 color video from one of my IIci/cx. It needed a recapping and I gave one. 9 caps in total - 6 22µf and 3 47µf caps.
The thing with the card is this, when put into a Mac II (IIcx/ci/fx and so on) there is no video then you turn it on. Just a blank screen. After a few seconds where it should give a Happy Mac of Flashing "?" in a Disk Icon, it gives the chimes of death.
The Macs tested with other video cards work fine before and after the testing of this particular card.
Giving a recap should have fixed this card, it didn't. Traces look OK but I broke a trace on a 47µf cap forcing me to give it a pig tail repair to fix the trace. Same symptoms still occur.
Fixable? What's shorted out? I think its holding down the 5V line which RAM needs to pass a Memory Test Boot Sequence which the Death Chimes says it is failing.
because the cap goo has cut off traces.
Been there, done that. I have that card in my IIx, and had to fix a few traces after recapping, and it was fine.
There is a capacitor that sits right on a bunch of traces that run back to the RAM.
Been there, done that. I have that card in my IIx, and had to fix a few traces after recapping, and it was fine.
There is a capacitor that sits right on a bunch of traces that run back to the RAM.
Is there a schematics I can get? I found most traces to be OK but other traces that disappear under chips and cant find a connection to them.
Not that im aware of. Have to use experience to figure it out. Start with chip datasheets