Re: apple 11e monitor cable

[Rubywand <rubywand@swbell.net>]

Todd Belville writes ...
> 
> I recently aquired an Apple 11e computer system. I have all the original
> manuals.
> The RCA jacks between the cpu and monitor were damaged. I assumed they were
> RCA and replaced them. But after replacing them the monitor is still not
> picking up the signal.  I am booting to a: and I can hear the program
> loading but can see nothing but a bright green screen. I get no prompt.
> 
> Any troubleshooting ideas would be greatly appreciated. Maybe a bad video
> card?
> I have no components to troubleshoot with other than the system itself.

 ....

     Just to make sure we are 'on the same page', the standard IIe video
output comes from an RCA jack mounted on the back of the motherboard.
There should be no "video card" to worry about.

     Also, you mention damaged "jacks". As far as I know, there is only
one RCA jack you can get to at the back of a standard IIe. It is the
composite Video Output jack near the right-back corner of the computer.

Note: Some plug-in cards may have RCA jacks; but, we are talking about
standard built-in video.

     Viewed from the back, Video Out is the jack farthest to your left.

     Viewed from the back, just to the right of Video Out are two mini
phone jacks (like the kinds on earphones, etc.) which let you connect to
a portable cassette tape recorder for saving and loading programs. (This
is a carry-over from days before disk drives became standard.) Neither
of these has anything to do with video. If you've replaced one of these
with an RCA jack it should not hurt anything.


     So, first, make sure you are plugging in your monitor at the right
place-- i.e. into Video Out.


     A good start on troubleshooting is to make sure that your
connecting cable is good-- i.e that the GND (shell) of each RCA plug is
connected and that the Signal (center prong) is connected and that the
Signal part is not shorted to GND. You can use an Ohm meter to check
your cable. (Or, you can use a known-good "hi-fi" cable or buy a new
video cable from Radio Shack.)  

     Check the monitor and cable by plugging it into the "Video Out" of
a VCR and getting a display of a tape you play in the VCR. (On some
monitors, you may need to set some "Input Level", etc. switch and/or
adjust some controls.)

     Once your monitor + cable checks out, try it with your IIe. Let us
know what you discover.

      

Rubywand