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- Path: grapool30.rz.uni-frankfurt.de!news
- From: raftopou@stud.uni-frankfurt.de (Joerg Raftopoulos)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Amiga 3000 troubles
- Date: 11 Feb 96 01:34:44 +0100
- Organization: J. W. Goethe-Universitaet Frankfurt/Main
- Message-ID: <1646.6615T94T2219@stud.uni-frankfurt.de>
- References: <4f6p8u$7gi@math.mps.ohio-state.edu>
- NNTP-Posting-Host: dialin154.rz.uni-frankfurt.de
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP) *UNREGISTERED*
-
-
- JG> Last summer my Amiga and modem were damaged during an electrical storm.
- JG> I got the modem fixed (it was on warranty thank goodness) but my Amiga
- JG> is still crippled. Everything seems to work ok except for the graphics.
- JG> Here are some descriptions of what is wrong:
-
- JG> 1) When I resize a window, the edges of the window get
- JG> trashed and leave lots of extra lines around
-
- JG> 2) When text is scrollin on the screen, extra dots appear
- JG> or something dots disappear. This can make reading text
- JG> difficult
-
- JG> 3) During hard drive access, the graphics troubles seem to
- JG> increase in the form of flickering screens etc. but the
- JG> hard drives work properly as far as I can tell
-
- JG> Can someone out there help me identify the trouble and recommend
- JG> how to fix it? Perhaps someone has some diagnostic software I
- JG> could run?
-
-
- won`t be easy...
-
- i recently fixed an amiga 3000 desktop with a similar problem. i had to change
- u 202, labeled PAL 390526-02. that pal generates a strobe for chipmem access.
-
- best way to track down the fault would be to get another amiga 3000 and change
- the socketed chips one by one. start with chip related devices like agnus
- (use plcc chip puller!) , denise etc. next step would be drams and pals.
- finaly you switch to the leftover chips like buster, garry and so on.
-
- no success? now you are up to do a good solder job, change chipram bus related
- drives (for schematics consult your "introducing the amiga 3000" manual,
- appendix e)
-
- if you aren`t good a soldering: forget it and consult your local amiga dealer.
-
-
-
- bye and good luck
-
-