morgana@canard.wrc.xerox.com (Steve Morgana) (03/26/91)
I think this has been asked several times before, but I did not pay attention since I didn't think it could happen to me :-), perhaps it should go into the frequently asked questions posting. The rgb monitor attached to my A1000 has started "snapping", about once every 5 or 6 minutes. At first I didnt think it was a big deal, but once, when I was debugging my LUCAS board, I noticed that whenever the monitor snapped, my logic probe would indicate a pulse occured even when it was not actually in use. I assume that something nasty is happening to the power supply during these snapping episodes. I dont remember the model number of the monitor, but its the one that was sold back in the very beginning of Amiga time. Stephen morgana.wbst128@xerox.com
yorkw@stable.ecn.purdue.edu (Willis F York) (03/26/91)
morgana@canard.wrc.xerox.com (Steve Morgana) writes: >I think this has been asked several times before, but I did not pay >attention since I didn't think it could happen to me :-), perhaps it >should go into the frequently asked questions posting. >The rgb monitor attached to my A1000 has started "snapping", about once >every 5 or 6 minutes. At first I didnt think it was a big deal, but >once, when I was debugging my LUCAS board, I noticed that whenever the >monitor snapped, my logic probe would indicate a pulse occured even when >it was not actually in use. I assume that something nasty is happening >to the power supply during these snapping episodes. >I dont remember the model number of the monitor, but its the one that >was sold back in the very beginning of Amiga time. Mine is very OLD also, and mi would "snap" and have a little "starburst" in the middle of the screen, (A little Explosion) and then of late, it's been "blacking" out. The picture would die, turing it on/off would correct it on SOME instances.. But it seems a LOT better NOW. What i did. 1) Opend the Dang thing. (BE CAREFULL, Ya COULD KILL YA SELF) 2) Dusted it out. (with a feather duster.) 3) Removed the internal speaker.(I broke it opening the case :^( ) (Removing the speaker will help airflow through the case :^) 4) Took black tape, and there appeared to be "melted" plastic on the main CRT tube, at the small end, near some plastic rings. I cleande off the "melted" stuff, (Very brittle) and wraped the area in Black tape. Well it ain't gone bad since. I don't know what the OTHER people did to fix their problem.. :^) . -- yorkw@ecn.purdue.edu aka Willis F York aka Squid on IRC The only thing that Apple invented is the idea to borrow Xerox-invented ideas. (Hope THIS sig don't insult anyone!) :^)
tbissett@nstar.rn.com (Travis Bissett) (03/29/91)
morgana@canard.wrc.xerox.com (Steve Morgana) writes: > > The rgb monitor attached to my A1000 has started "snapping", about once > every 5 or 6 minutes. At first I didnt think it was a big deal, but > once, when I was debugging my LUCAS board, I noticed that whenever the > monitor snapped, my logic probe would indicate a pulse occured even when > it was not actually in use. I assume that something nasty is happening > to the power supply during these snapping episodes. > > I dont remember the model number of the monitor, but its the one that > was sold back in the very beginning of Amiga time. > This may be a lightning bug common to early 1080 monitors manufactured for CBM by Toshiba. If so, then it is near catastrophic failure. If this msg reaches you in time I advise you to not use that monitor until repairs can be made. Start searching right away for AMAZING COMPUTING FOR THE COMMODORE AMIGA volume 5 number 7 (July '90) where the fix is well documented. It seems that a heat sink near the high voltage section inadvertently acts as a capacitor -- and discharges thru board components. 2 years ago mine snapped for a while (ignorance is not always bliss) then smoked a resistor and an inductor. The resistor was simple but the inductor was impossible. Neither Toshiba nor CBM would sell me that part nor provide engineering info that would allow me to replace it. I sold it for $50 as salvage to a guy who happened to have a CBM repairman for a friend. This guy worked CBM service hard for 3 months and they finally sent him a salvaged component. And that monitor is working well for him to this day. The moral is that it can be fixed if caught in time -- but if not it may be fatal to the monitor. Good luck! Travis -- Travis Bissett NSTAR conferencing site 219-289-0287 internet: tbissett@nstar.rn.com 1300 newsgroups - 8 inbound lines uucp: ..!uunet!nstar.rn.com!tbissett 99 file areas - 4300 megabytes --- backbone news & mail feeds available - contact larry@nstar.rn.com ---
dtiberio@libserv1.ic.sunysb.edu (David Tiberio) (04/01/91)
-- David Tiberio SUNY Stony Brook 2-3481 AMIGA DDD-MEN -- Any students from SUNY Oswego? Please let me know! :)