well... thats just it... when it comes to CRT displays it -can- be
anything... and (i know im not going to gain any friends by saying
this.. but i dont think i have any on this list anyway) the macs
'closed box' design pretty much meant that when one breaks that its
just time to throw it away ('appliance computers' as apple called
them)
now on to the repair (this applies with pretty much any CRT display so
this is the easy part)
simple fixes; im not familiar with SE video displays but there -might-
be adjustments for h-size and v-size (and position) on the inside...
just re-adjust... they may not be labeled so you may have to get a
schematic tho this is doubtful... may also not be present... not sure
what to do there... (never seen a CRT display without height and width
adjustments... even TVs have them)
hight and widht may be on the top (or bottom) of the deflection yoke
hidden under a white or beige 'cap'...
serious problems;
this can also be a hard-to-fix short in the CRT (tho doubtful) or a
tired flyback transformer (high voltage!) a failing HOT (horizontal
output transistor... biggest transistor in the CRT circuitry) flaky B+
('low' voltage).... or partial short in the deflection yoke.... (just
to name a few possibilities.... i dont know what the display
looks/acts like so i cant narrow it down)
suffice it to say... try looking for and tweaking position/size
adjustments first... (try to avoid adjusting 'linearity'.. else you
will have one funky looking image)
On 18/01/06, Martin Swartz <[EMAIL PROTECTED]> wrote:
> Hello, all -
>
> In a previous (business) life I did a lot of support / hacking around
> with Macs, mostly 1xx Powerbooks and the SE series. Those days are
> gone. Now I have several questions to ask that relate to Classic Macs
> as restoration projects.
>
> In the corporate days, any one-piece Mac with flaky or failed video
> was scrapped out. Today I have a Color Classic that exhibits a working
> but shrunken video image. I've seen conflicting opinions about what
> can cause this, ranging from "cathode ray tubes do this when they get
> old" over to "the high voltage circuitry is going bad, not the CRT per
> se".
>
> What's the prevailing wisdom among this group? Can the analog
> circuitry be tweaked? Does someone build "new" replacement analog
> components for a reasonable price? Or is the answer "none of the
> above"?
>
> Thanks in advance for any advice.
> - Marty
>
--
--sam
http://mephitus.renamon.org/
"When you've done something right, no one will be sure you've done
anything at all." -- Futurama
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