Dead Commodore 1084?

[CaelThunderwing]

after a month wait on a replacement Gotek Unit, went to wire it in as external drive and saw the display "Sleep" (i had the amiga copy the WB Disk i dont want to put much wear on my original WB1.2 Disk)

But no smell no sound no smoke no appearance if the tube popped, but it has a glitter effect in just behind the glass, (mind teh glare used my iphone)

[Pat the Cat]

If the tube is undamaged, it's most likely a fault with the high voltage circuits feeding it. Line output transformer common failure, or component feeding it.  TV repair people of a certain age could probably get it going again. I don't touch the things personally

If the tube becomes unsealed and the vacuum integrity is gone, it will stop working real quick, and you would need glassblowing skills and a lot of other stuff to fix it. Having parents called Mary and Joseph might help, because quite frankly that sort of fix really is a miracle.

[paul1981]

after a month wait on a replacement Gotek Unit, went to wire it in as external drive and saw the display "Sleep" (i had the amiga copy the WB Disk i dont want to put much wear on my original WB1.2 Disk)

But no smell no sound no smoke no appearance if the tube popped, but it has a glitter effect in just behind the glass, (mind teh glare used my iphone)

Where abouts are you? Someone local may have a look at it or know of someone or some company/repair shop who can have a look at it for you.

[darkage]

Lets start building a new tube - https://www.youtube.com/watch?v=jlV-2gcO0_0

Normally if a CRT tube loses vacuum debris gets sprayed in all directions internally when it tries to implode.  Ive done it once and I had a big black spray paint effect in the centre behind the screen.       Silver specks is interesting.  Theres a phorsphor coating just behind the screen, so either something has happened to the coating or vacuum seal is gone.    

If either a CRT tube or flyback transformer is gone then you will need another unit and keep the existing one has a donor.  

time for indivision perhaps ?

[Pat the Cat]

Yeah, black area is a definitely dead tube, Silver gilints is inconclusive to me. Seen tubes with it that were dead, seen 'em working too.

[CaelThunderwing]

Where abouts are you? Someone local may have a look at it or know of someone or some company/repair shop who can have a look at it for you.

Michigan, USA

and after awhile teh picture came back on its own, (the CRT "Glow" can be seen from the backside thru the vents.) but its gone out a few times as well.

[darkage]

and after awhile teh picture came back on its own, (the CRT "Glow" can be seen from the backside thru the vents.) but its gone out a few times as well.

OK so picture sometimes goes out but it does return.  Might definitely be the flyback transformer.   You need to get that tested.   Or it could be something simple like dry solder joints not forming proper connectivity.  Normally would breakdown when unit warms up and be okay when cold.   What happens if you give it a good bang when its not working ?   does the image come back for a moment or two ?


Once I picked up a nice looking more modern flat screen CRT TV
from the side of the road, it would powerup but picture would dissappear to black screen until it cooled down.   I figured dry joints.   So I discharged power caps, and reflowed the joints within power related circuits.   Then it worked perfect after that.

Best to send to a electronics repair shop if your not experiencecd with high voltage appliances.

[spaceman88]

If it "comes and goes", probably not CRT or flyback. Most likely bad solder joints in the heater circuit. The glow you see in the neck of the of the tube is the heater it needs to warm up the red, green and blue guns in the CRT. The poor connections could be on the small board on the back of the CRT or near the flyback. They could be labeled "heater", "6.3 V" or a picture of a wire in a coil shape. They may also not be labeled at all!! I can't remember on the 1084s.

[Dandy]

Michigan, USA

and after awhile teh picture came back on its own, (the CRT "Glow" can be seen from the backside thru the vents.) but its gone out a few times as well.

Ummm - somehow reminds me of an old TV set I once had, where the tube filament was burnt-out.
When I carefully knocked on the tube neck (on the backside of the cathode ray tube) with the isolated handle of a screw driver, I sometimes succeeded to contact the loose ends of the burnt-out tube filament. Then I had a picture again - but just for a while...

That TV set also had that "glitter" effect...

If that should be the case with your monitor, you either have to replace the entire tube, or you could try to find a company that repairs cathode ray tubes. Back in the days there were companies that cut off the end of the tube neck in a vacuum, removed the old electron gun, replaced it with a new one and finally merged the tube neck with the glass socket of the new electron gun again...

[Amiwest]

If it is any help:
http://gona.mactar.hu/Commodore/monitor/Commodore_monitors_by_model_number.html
has service manual on line - or
http://amiga-manuals.xiik.net/
has schematic
I had an Commodore monitor that had a dirty analog/digital switch and operating it a few time's made it usable.
Same symptom different model