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Author Topic: Commodore 1084S monitor  (Read 6056 times)

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Offline magnetic

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Re: Commodore 1084S monitor
« Reply #14 from previous page: August 20, 2013, 03:10:04 AM »
Quote from: Plaz;745375


As someone above said..... there are lethal voltages inside. The can kill. If you're not experienced, then let the pro's handle it. Good luck, I hope you have good video again soon.




Im glad people keep saying this over and over its very true. THESE MONITORS ARE DANGEROUS. DO NOT work on them unless you know exactly what you are doing. You can die from it. I knew of a video artist in nyc who died from a CRT discharge. (He used to take insides out of tvs and make art pieces)
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Offline Plaz

Re: Commodore 1084S monitor
« Reply #15 on: August 20, 2013, 03:20:39 AM »
I repaired TV's, monitors and other high voltage electronics for 25 years AFTER I had been trained by private schooling and the military. I've heard many stories of people who lost their lives from voltage not only from monitors, but from cars, appliances and air conditioning systems. Thank goodness I don't have any personal experiences to share... other than all the years I've spent telling other people to "STAY OUT OF THERE!"  ;)

I still repair the occasional flat panel systems too, and those are just as dangerous as the retro tubes. So stay out of there too!!

Plaz
 

Offline Oldsmobile_Mike

Re: Commodore 1084S monitor
« Reply #16 on: August 20, 2013, 03:40:56 AM »
IMHO people should really just junk all those old retro tube TV's/CRT's into the trash, and get themselves a nice LCD monitor, but I know that idea is shunned upon here at a.org.  *wink wink*  ;-)
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Offline Methuselas

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Re: Commodore 1084S monitor
« Reply #17 on: August 20, 2013, 04:14:42 AM »
Quote from: Oldsmobile_Mike;745389
IMHO people should really just junk all those old retro tube TV's/CRT's into the trash, and get themselves a nice LCD monitor, but I know that idea is shunned upon here at a.org.  *wink wink*  ;-)


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Offline GadgetUK

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Re: Commodore 1084S monitor
« Reply #18 on: August 21, 2013, 09:24:03 AM »
Quote from: Plaz;745385
I repaired TV's, monitors and other high voltage electronics for 25 years AFTER I had been trained by private schooling and the military. I've heard many stories of people who lost their lives from voltage not only from monitors, but from cars, appliances and air conditioning systems. Thank goodness I don't have any personal experiences to share... other than all the years I've spent telling other people to "STAY OUT OF THERE!" ;)
 
I still repair the occasional flat panel systems too, and those are just as dangerous as the retro tubes. So stay out of there too!!
 
Plaz

When I was an apprentice elec engineer I was working on a colour monitor (on my own) and got too close to a leaking LOPT transformer - you could smell the ozone and hear a ticking noise, the ticking was high voltage seeping out from near the edge of the transformer to some nearby point, but it was so small an arc I couldnt see it.  Anyway, got too close to it - ~25Kv down my arm, likely had a heart attack because whilst I 'fell away' from the point instead of into it, I collapsed on the floor and was in a cold sweat for probably 15 minutes and couldnt even get up off the floor.
 
That was the day a monitor nearly killed me for my lack of respect of DC high voltages.  To this day I stay well away from the internals of a powered up monitor and sweat a little when I am working inside it even when its off.  So yes, monitors are dangerous things.  Some things are not worth tinkering with unless you know what you are doing - I knew what I was doing (even as an apprentice), but my inexperience meant I didnt expect EHT to be arcing anywhere from what looks like a solid plastic molded LOPT.  Voltage finds a way when the conditions are right, that's why a lot of these high voltage boards have cut out gaps in the PCB etc, some times around LOPT.
 

Offline sturulezTopic starter

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Re: Commodore 1084S monitor
« Reply #19 on: August 21, 2013, 10:45:33 AM »
For some reason now the monitor works. I fiddled around with the cables at the back of the monitor, mainly the large round one which i believe is the power cable. And hey presto it works. Not sure why it stopped working a few days ago.
 
I suppose the only problem is how long will it last before it goes off again.
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Offline GadgetUK

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Re: Commodore 1084S monitor
« Reply #20 on: August 21, 2013, 11:54:33 AM »
Quote from: sturulez;745646
For some reason now the monitor works. I fiddled around with the cables at the back of the monitor, mainly the large round one which i believe is the power cable. And hey presto it works. Not sure why it stopped working a few days ago.
 
I suppose the only problem is how long will it last before it goes off again.

Glad it's working now, hopefully permenantly.  It sounds like it could be a cap or resistor on PSU side if it comes back.  LOPT faults aren't normally intermittent like that.  Could also be a dry solder joint, perhaps on PSU side.

Regards 'fiddled around' - that's how you kill yourself!  When you say round cable I am not sure where you mean?
 

Offline Amiga_CDTV

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Re: Commodore 1084S monitor
« Reply #21 on: August 21, 2013, 11:57:24 AM »
Quote from: GadgetUK;745654
Glad it's working now, hopefully permenantly.  It sounds like it could be a cap or resistor on PSU side if it comes back.  LOPT faults aren't normally intermittent like that.  Could also be a dry solder joint, perhaps on PSU side.

Regards 'fiddled around' - that's how you kill yourself!  When you say round cable I am not sure where you mean?
I got the picture that he didn't open the monitor. To me it sounds like just a loose cable or intermittent connector. Power cable is the black thin cable, the big round one is the RGB cable.
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Offline Oldsmobile_Mike

Re: Commodore 1084S monitor
« Reply #22 on: August 21, 2013, 05:17:10 PM »
Quote from: Amiga_CDTV;745655
I got the picture that he didn't open the monitor. To me it sounds like just a loose cable or intermittent connector. Power cable is the black thin cable, the big round one is the RGB cable.


Feel free to flame away, but if OP doesn't know the difference between the power cable and the RGB cable plugged into the back of his monitor, probably best not to give advice how to disassemble or work on the insides of one, LOL.  ;)  Oh well, glad it's working again!
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Offline amiga-penn-wchester

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Re: Commodore 1084S monitor
« Reply #23 on: August 21, 2013, 06:19:50 PM »
may be that the fiddling with the back of the unit moved the pcb enough to "fix" the cold solder joint which is almost always on the flyback on the 1084s.

one time this happened to me and I was too lazy to discharge everything on the monitor, I stuck a sharpie pen between the flyback and its metal shield and that bridged the correct cold joints to make the screen come back on... in fact I left the pen in there, and put the cover back on...