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Replacing VLSI chips to solve nonbooting cubes

 
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barcher174



Joined: 07 Dec 2012
Posts: 594

PostPosted: Sun May 01, 2016 10:33 pm    Post subject: Replacing VLSI chips to solve nonbooting cubes Reply with quote

All,

Do you have a cube that won't boot? Does it boot to a black screen, but the screen is still lit? The diagnostic LED will also not be lit or may blink undocumented codes.

1) Check the CPU and ROM
2) Check the RTC chip and associated diodes
3) Replace the ICP (integrated channel processor - The VLSI next to the CPU)





Does the cube not provide video at all?

It could be the video IC





Where to get these parts? A first generation nextstation has an identical ICP and video chip. A typical failure for a video IC is detached chip legs. I have not seen a case of apparent physical damage to the ICP. I think thermal stress is killing the video IC. I received the board pictured above with both chips removed. Rob believed it came from Bell Services, which gave me the idea that these were common failures at the time. I have now revived 2 additional cube boards using this technique.

--
Brian
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Rob Blessin Black Hole
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Joined: 05 Sep 2006
Posts: 656
Location: Ft. Collins, Colorado

PostPosted: Mon May 02, 2016 12:25 am    Post subject: Re: Replacing VLSI chips to solve nonbooting cubes Reply with quote

barcher174 wrote:
All,

Do you have a cube that won't boot? Does it boot to a black screen, but the screen is still lit? The diagnostic LED will also not be lit or may blink undocumented codes.

1) Check the CPU and ROM
2) Check the RTC chip and associated diodes
3) Replace the ICP (integrated channel processor - The VLSI next to the CPU)





Does the cube not provide video at all?

It could be the video IC





Where to get these parts? A first generation nextstation has an identical ICP and video chip. A typical failure for a video IC is detached chip legs. I have not seen a case of apparent physical damage to the ICP. I think thermal stress is killing the video IC. I received the board pictured above with both chips removed. Rob believed it came from Bell Services, which gave me the idea that these were common failures at the time. I have now revived 2 additional cube boards using this technique.

--
Brian
. Hello Brian : Excellent work ,I'm always very impressed ! Best regards Rob Blessin
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Rob Blessin President computerpowwow ebay sales@blackholeinc.com http://www.blackholeinc.com
303-741-9998 Serving the NeXT Community since 2/9/93
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