>Mark A. Kippert on 3/2/01 9:53 AM wrote:
>
>> In addition to the 2300 I mention in another post I have a second 2300 that
>> has problems. This one boots fine, has a good main & PRAM battery. The
>> problem is the video.
>>
>> In 8-bit (256) color I get a weird pattern. It looks like every other
>> vertical line (about a pixel wide) is not working. They looks like vertical
>> white lines. If I switch to 16 colors or 4 color the vertical line get even
>> wider. In 1-bit (B&W) the lines are huge, about an eighth inch wide.
>>
>> In 8-bit grayscale everything looks great.
>>
>> If I switch to thousands of color I get the usual 640x400 screen, the lines
>> go away but the screen appears to loose green (or gets more red).
>>
>> Zapping PRAM (or resetting Power manager) won't help.
>>
>> Does this sound like bad VRAM?
>
>I put a completely different screen (from a 280c) on this 2300 and got the
>exact same results. So I'm guessing bad VRAM. Is this replaceable? Is there
>anything else I can do?
>
>-makmac
If it is the VRAM (what about the video control chips?), you could
try some utility that tests VRAM (Tech Tool ?).
If you can scrounge a dead 2300 mobo you could do a chip transplant,
which would take a fine hand at soldering.
Mad Dog
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