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From: frazier@cti.UUCP (Rick Frazier)
Newsgroups: comp.sys.amiga
Subject: Re: Oops! Bang goes the Amiga.
Message-ID: <557@cti.cti.UUCP>
Date: Fri, 6-Mar-87 10:49:33 EST
Article-I.D.: cti.557
Posted: Fri Mar  6 10:49:33 1987
Date-Received: Sun, 8-Mar-87 07:16:49 EST
References: <2684@jade.BERKELEY.EDU>
Organization: Cornerstone Technology, Inc.
Lines: 30

In article <2684@jade.BERKELEY.EDU>, spencer@eris.BERKELEY.EDU (Randy Spencer) writes:
> 
> Well, my Amiga that made it through a major car wreck this summer finally 
> got sick.  Not like it doesn't deserve a break, I carry it with me everywhere,

> green).  So I traced the signal back to where there actually was something
> and it is on the other side of a transistor labeled Q2 on the board.  There
> is a big "G" there, bet that means green!  The Transistor has:
>   C3504
>   E-5H
> written on the flat side of it.  I called Radio Shack and they were clueless,

The schematic (which you should really have if you plan to do much mucking
about inside the amiga, available for 20.00 as part of the "schematic
and expansion specifications" package from cbm) shows Q2, the green driver
transistor as a 2SC2926.  It's an NPN transistor, fed thru resistors r53 thru
r56 by a 74hc244 (u6a).  Coming from this '244 also are signals that go to the
mc1377, shich generates the composite signal.  If you have no composite output,
(or a strange signal there), you may have lost the '244, and not the
transistor.  The 4 bits for each of red and blue come from another '244 (u5a)
so that's why you could lose the green and not the other two colors.
Denise (the 8362) feeds both these '244s.

--rick

-- 
DISCLAIMER: The foregoing is the result of a brain frazzled by the effects of
insufficient sleep and a noisy phone line, and in no way reflects the opinion
of my employer, friends, or enemies.  I'm not even sure I really wrote it. 
UUCP:  {decwrl,pyramid}!sun!cti!frazier  DDD: 408-734-8533