GAUJCT@latvax8.lat.oz (08/18/90)
I have an Apple RGB monitor (nearly 2 year's old) which periodically refuses to power on. The indicator light blinks momentarily when power is applied and then remains off. It appears that there is some protection circuit coming into operation. Other similar monitors on campus have also shown this behaviour, but because it is extremely random we have not yet tracked down the source of the fault. Yesterday my monitor did not want to operate at all and in desperation I arranged to send it off to Apple to be repaired. We had swapped the power supply with a working unit and that did not solve the problem. This morning it was working as if nothing had happened. Any information as to what could be the likely cause would be greatly appreciated. John Traeger Chemistry Dept., La Trobe University, Victoria, AUSTRALIA (E-mail: GAUJCT@LATVAX8.LAT.OZ)
fdm@WLV.IMSD.CONTEL.COM (Frank D. Malczewski) (08/20/90)
In article <4602@latvax8.lat.oz> GAUJCT@latvax8.lat.oz writes: >I have an Apple RGB monitor (nearly 2 year's old) which periodically refuses >to power on. The indicator light blinks momentarily when power is applied >and then remains off. It appears that there is some protection circuit >coming into operation. Other similar monitors on campus have also shown this >behaviour, but because it is extremely random we have not yet tracked down the >source of the fault. Yesterday my monitor did not want to operate at all and >in desperation I arranged to send it off to Apple to be repaired. We had >swapped the power supply with a working unit and that did not solve the >problem. This morning it was working as if nothing had happened. Any >information as to what could be the likely cause would be greatly appreciated. > >John Traeger >Chemistry Dept., >La Trobe University, >Victoria, AUSTRALIA >(E-mail: GAUJCT@LATVAX8.LAT.OZ) This question is starting to earn its place on a Macintosh "most frequently asked questions" list. If anybody has exact details about just what the problem is, I would be more than happy to reply to any and all subsequent posts, after I got my monitor fixed as well. This problem is quite annoying, and seems to occur when my monitor passes some not-very-well-defined temperature threshold. Usually, once the monitor warms up beyond this point, it is fine. Sometimes, getting beyond the temperature point takes quite a while, with the monitor being unusable for hours; othertimes, it takes no more than a few seconds to pass this "threshold". Just what is the problem here? What can I tell my dealer? The problem does not happen to me unless it has gotten pretty cool overnight, but does not consistently happen even then. I know I'd like to get this fixed, as I can just see the monitor finally failing when I am most in need of it... x x x x x x --Frank Malczewski (fdm@wlv.imsd.contel.com) (malczews@nunki.usc.edu)
jsurine@entec.Wichita.NCR.COM (James Surine) (08/21/90)
In article <4602@latvax8.lat.oz> GAUJCT@latvax8.lat.oz writes: >I have an Apple RGB monitor (nearly 2 year's old) which periodically refuses >to power on. The indicator light blinks momentarily when power is applied >and then remains off. It appears that there is some protection circuit ... >problem. This morning it was working as if nothing had happened. Any >information as to what could be the likely cause would be greatly appreciated. >John Traeger Temperature might be the problem. Are the monitors in the sun in the afternoon Is the room the monitor is in get hot? etc... -- ____________________________________ j.surine@Wichita.NCR.COM (Jim Surine) | | NCR Peripheral Products Division | | work (316)636-8586 home (316)721-6280 /_____________________________________|
GAUJCT@latvax8.lat.oz (08/29/90)
In article <660@entec.Wichita.NCR.COM>, jsurine@entec.Wichita.NCR.COM (James Surine) writes: > In article <4602@latvax8.lat.oz> GAUJCT@latvax8.lat.oz writes: >>I have an Apple RGB monitor (nearly 2 year's old) which periodically refuses >>to power on. The indicator light blinks momentarily when power is applied >>and then remains off. It appears that there is some protection circuit > .... >>problem. This morning it was working as if nothing had happened. Any >>information as to what could be the likely cause would be greatly appreciated. > > > Temperature might be the problem. Are the monitors in the sun in the afternoon > Is the room the monitor is in get hot? etc... It happened again this morning. No monitor following power on. However, the usual trick of changing the monitor power supply from the IIcx computer outlet directly to the mains worked. This did not work previously so I don't think that the problem is external to the monitor. The temperature and humidity in my office are relatively constant, so these don't appear to be the cause either. Once the monitor is going it will not misbehave again during the day, no matter how often it is turned off and on. John Traeger