Re: Scrambled Video on Apple II+

[Rubywand <rubywand@swbell.net>]

Bryan Villados wrote:
> 
> Hi, guys!
> 
> I received an Apple II+ with a logic board problem. When turned on, it
> gives a bunch of H's in inverse mode across the screen. Which chips
> should I be looking at checking out?
> 
 ....

     Besides the fixes suggested by Matt, try unplugging and replugging the
IC's nearest the front of the motherboard. Also unplug-replug the cable from
the keyboard. (The idea of unplugging-replugging is to establish good
contacts for pins which may have lost connection due to accumulated gunk and
corrosion.)

     You might also try this: Turn ON the display monitor first. Let it warm
up and, then, turn ON the computer. If the screen begins blank and fills up
with H's line-by-line, you may have a stuck Repeat key. (Or, if the keyboard
has been replaced with one featuring auto-repeat keys, you may have a stuck
"H".)



Rubywand