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| SE/30 no chime or video (MLB issue) |
Posted by: techknight on 2020-05-22 15:43:35
Make sure your RAM SIMMs are ok, and you have at least 4 matching SIMMS in stalled.
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Posted by: elemenoh on 2020-05-22 16:08:06
I triple checked and booted with another board OK. Moved its ROM and RAM to this board but get the same result. Slow chimes. Does replacing the F258's next make sense?
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Posted by: Bolle on 2020-05-23 09:00:02
Check all signals on the RAM sockets and trace them to their destination.
Often you get broken traces around the resistor network next to C1.
The RAS and CAS lines run through there - if one of those is broken you will get slow chimes.
Sidenote: we should find and establish new names for the different faulty screen outputs. People use simasimac no matter what the screen is actually showing... no ROM stripes, broken data line grey screen with artifacts, different states of video logic failure... they are all different and usually give hints where to look first when hunting down the problem.
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Posted by: desertrout on 2020-08-22 00:36:39
I triple checked and booted with another board OK. Moved its ROM and RAM to this board but get the same result. Slow chimes. Does replacing the F258's next make sense? @elemenoh Did you find a solution?
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Posted by: elemenoh on 2020-10-28 21:03:15
@desertroutI need to double check, but I think this one (and a bunch of other boards) recovered after an ultrasonic clean. I recently got a tank and it recovered 6 boards that were previously full of gremlins despite lots of manual washing. Totally worth it if you work on MLBs regularly!
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Posted by: desertrout on 2020-10-29 06:16:00
Cool. Which tank did you get?
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Posted by: elemenoh on 2020-10-29 12:51:31
https://www.amazon.com/gp/product/B01ENVZ0LU/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
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Posted by: desertrout on 2020-10-29 15:08:48
https://www.amazon.com/gp/product/B01ENVZ0LU/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 thanks
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