Re: Scrambled Video on Apple II+

[Matt Jenkins <mdj@bilby.cs.rmit.edu.au>]

Bryan Villados <news001@nospam_macgeek.org> 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?

> Thanks! :)

First thing I'd try is removing and reseating the ROM chips, then try 
CPU, RAM, etc.

There's about 120 chips on the Apple II+ which make it a nightmare to find
the problem, but in my experience, taking ones time and reseating chips
systematically often leads to success.

Another important thing: When doing this, remove all peripheral cards from
the board. This way, you can be sure that it isn't a botched card that's
causing the problem

Cheers,

Matt


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