labc-1id@web-1c.berkeley.edu (Joe Chung) (03/10/91)
HELP! About a month ago, my 1084 monitor, which I've had for over 4 years, started to go to sleep. I had to hit it on it's right side to get it to wake up. I knew about the problems it has with it's power supply. So I took it apart and examined the power supply. I found a pin around the transformer that wasn't soldered very well, so I proceeded to resolder it. But my montior continued to go to sleep. So I took the power supply out again and reflowed all the solders around a few large caps. After that, it worked for a day and a half and the monitor went to sleep again!! So now I must assume that some part is faulty. Something that likely sinks a lot of current and goes out after it gets hot. Can anyone help me out on this? Thanks -jc -- labc-1id@web.berkeley.edu No news is good news.
paulz@hpspdra.HP.COM (Paul Zander) (03/12/91)
Intermittent hardware problems can be very difficult to find in any piece of electronics equipment. Sometimes the part is sensitive to temperature. Open the case and turn on the equipment. KEEP YOUR HANDS AND OTHER BODY PARTS CLEAR OF THE HIGH VOLTAGE. Use a small hair dryer to try heating different parts. Be careful not to melt them. Before there were holes in the ozone layer, technicians often had a special bottle of freon to chill suspect parts. You might contact a real dealer in electronics (not Radio Shack) to see if there is an environmentally "safe" version of "Koolz it".
lou@vaxsc (03/13/91)
In Message <1991Mar9.215854.12214@agate.berkeley.edu>, Joe Chung writes: >HELP! > >About a month ago, my 1084 monitor, which I've had for over 4 years, started >to go to sleep. I had to hit it on it's right side to get it to wake up. If this is the monitor that is OEM'd by Magnavox I have a suggestion for you. Unfortunately it's not a great one, perhaps someone can help me find parts for mine as well. The monitor likely has a bad flyback transformer. What happens (in some Magnavox monitors) is that the 2nd anode lead coming out of the transformer (literally) burns up, and the carbon increases the resistance of the contact (within the xfomer). Hitting on the side causes the lead to shift or otherwise move slightly enough to find a place where it can once again make contact. And yes, once it heats up, the contacts degrade. So my suggestion is to get the flyback transformer replaced. Unfortunately, I haven't been able to locate one for mine, and Magnavox won't sell me one so I have to take it to a repair center. (Which I havent yet done). I could be wrong on this, so don't take it as gospel. Let a repair center be the final word, not mine! If some one knows of a better way, please let me know. Mine is essentially the same monitor as the Commodore 2002 (?), also OEM'd by Magnavox. Hope this helps! ---------------------------------------------------------------- -Lou Williams Via Bitnet : william8@niehs.bitnet Via Internet: lou@vaxsc.niehs.nih.gov Computer Sciences Corporation, Research Triangle Park, NC ---------------------------------------------------------------- -Sometimes in order to feel better about yourself, you have to make others feel bad, and I'm tired of making others feel good about themselves. -Homer Simpson. ---------------------------------------------------------------- All this is just my opinion, and likely warped ones at that.