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30 September 2010, 12:02
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#21 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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signal on half 157 are ok, the other are up, i dubt on signal cck
the mother present solder manual prev repair not my p.s. please link a photo hi-res of motherboar 1,3 i find the components placed bad |
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30 September 2010, 14:27
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#22 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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i look with oscilloscope the signal in my a500 an i suppose the 74ls157 in my a600 is really broken, but whit 74F157 don't go, please confirm 74hc157 compatibility?
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30 September 2010, 22:45
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#23 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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i found a ls257 and f257, go to test?
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01 October 2010, 00:07
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#24 |
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Ya' like it Retr0?
Join Date: Jul 2005
Location: United Kingdom
Age: 49
Posts: 9,768
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@cpiac64
Just an implausable idea: is it possible that F157 might be latching to quick? thus not giving enough propagation time thats expected by other components? If you can manouver an LS257 in place that should good, however being that its a Tri-State as opposed to a dual state its possible it might mess up which state it needs to be in. |
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03 October 2010, 23:16
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#25 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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i found on ebay germany five 74ls157 so16 for 5€, when i receive, i change it and post the result.
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06 October 2010, 16:36
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#26 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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changed but nothing, any idea?
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10 November 2010, 22:03
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#27 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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news, i have from ebay 2 new mainborad broken, one is half dead (floppy don't go and no video), the other non reset, i change a capacitor and now go but right switch don't go, i suppose the liquid of capacitor have broken a signal
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12 November 2010, 23:58
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#28 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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i have used my brain, in the first a600 the mouse don't go but don't go movement and the 2 switch, the common are 5 volt and ground, the 5 volt are good, i test ground and i found the pin in connector sub-d are broken, i change the connector and now mouse is ok but not ok the right switch, i have now used my brain and i speak to me, 2 motherboard with same fault are not possible, i change the mouse and now i hawe 2 a600 all perfect - strange the first my mouse function 100% on my a1200
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15 November 2010, 00:29
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#29 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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http://img254.imageshack.us/img254/189/pict3239.jpg piggy on piggy - 2 mega on a600
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15 November 2010, 00:55
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#30 | |
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PSPUAE DEV
Join Date: Nov 2006
Location: Wales / UK
Age: 45
Posts: 5,999
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Quote:
Good luck with putting it back together and the floppy proberly wont fit,  .
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09 February 2012, 15:29
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#31 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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i released a new version of piggy only 3 solder on board
tomorrow more info and photo |
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09 February 2012, 15:40
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#32 |
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Registered User
Join Date: May 2001
Location: ?
Posts: 19,645
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What are you pigybacking there? Memory?
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09 February 2012, 17:19
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#33 | |
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Registered User
Join Date: Sep 2009
Location: Norway
Posts: 1,710
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Quote:
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09 February 2012, 17:21
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#34 |
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Registered User
Join Date: May 2001
Location: ?
Posts: 19,645
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Hahaha!
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