Re: AppleColor RGB all-red display

[Michael J. Mahon <mjmahon@aol.com>]

D Finnigan <dog_cow@macgui.com> wrote:
> The story continues:
> 
> Yes, it was a bad transistor for the red channel. It tested differently
> compared to the blue and green transistors. Using better light, I could also
> see scorch marks on the PCB from where I'd apparently made a short circuit
> the other day.
> 
> Next step now is to find out what kind of transistor it is, and get a
> replacement part.

Glad you found it. 

I'd guess a high voltage (50-70v) medium beta NPN. After replacement you
may need to adjust the red brightness ("screen") and contrast ("gain") to
get the colors right again. 

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon