Re: My Lisa 2/10 won't power on anymore

Car light bulbs are an excellent suggestion for dummy loads! Even though headlamp bulbs are 12v, they can make a great load for the +5v rail.

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On Sun, Feb 18, 2018 at 7:27 AM, PSchaefer <dr.p.schaefer_at_email.domain.hidden> wrote:

>
> Am Samstag, 17. Februar 2018 01:50:12 UTC+1 schrieb Tom Stepleton:
>>
>> This might be helpful---I was able to carry out a bench test of 1.2A and
>> 1.8A power supplies using the procedure I describe here:
>>
>> https://68kmla.org/forums/index.php?/topic/30781-apple-lisa-
>> doesnt-boot-need-help-troubleshooting/&tab=comments#comment-335026
>>
>> If you do the same, you may be able to isolate the problem to the
>> PSU---or get closer to ruling it out. Do make sure you have resistors that
>> are up to dissipating all that power, though
>>
>
> For PSU testing I use vehicle lightbulbs as dummy loads. You certainly
> know these spares boxes with lightbulbs where you need one or two for your
> car and the others are never used? Solder wired to them with alligator
> clips or 4mm plugs and put them onto a heat-resistant surface.
>
>
> IIRC a Lisa with I/O board removed will start up immediately (ignoring the
> power switch) and generate a raster, but selftest hangs. That mode can be
> used to probe voltages in-situ with most of the load applied.
>
>
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-- 
Jason Perkins
313 355 0085

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