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Old 16 August 2013, 22:35   #1
trydowave
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I think my Commodore 1984S monitor just died :(

Hi all. I was just playing a game on the ol Commodore 1084S monitor and the screen went blank and it started to make this high pitch squealing sound. I turned it off and back on but I got the same thing again?

Does anyone know if this is the sign of a dead tube?

Cheers
Tony
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Old 16 August 2013, 22:40   #2
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Flyback transformer or a power Capacitor
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Old 16 August 2013, 22:43   #3
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Bugger. Do you know if these things are repairable? I really don't want to go fiddling at the back of it in fear of getting electrocuted.
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Old 16 August 2013, 22:46   #4
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Caps can be replaced, not sure on the transformer, may need a replacement
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Old 16 August 2013, 23:52   #5
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The flyback is not repairable, only replaceable. Equivalent 3rd party parts are still available if you google around. Make sure you get the right one. There are a few different models of the 1084 around and the flybacks are not interchangeable.
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Old 17 August 2013, 14:23   #6
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mine did exactly the same about 3 months ago, i called local tv repair shops in my area and only one guy was comfortable repairing it on the condition he could source parts which he gave me a 20% chance of getting. wanted over a hundred quid for the repair and parts though, so sadly it ended up in the bin and forced to search ebay for a local replacement (which i've not found yet)
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Old 17 August 2013, 15:07   #7
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The high voltage section of CRT units is nasty, it can also be that the flyback transistor has gone short but they can be a bit difficult to test as they sometimes have internal resistors. HR Dieman sell replacement flybacks. It can still be other passive components but when flybacks go they usually have arcing somewhere on the unit through a crack in the case but this isn't a guarantee that it's failed.

http://www.hrdiemen.com/reparation/flyback/index
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Old 17 August 2013, 22:12   #8
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I'm not repairing it myself because if the electricity involved not to mention my complete lack of knowledge about monitor or tv repairs. At £100 fixing it isn't really an option either. Its a shame to throw it but I don't know what else to do.

Cheers anyway for the advice.
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Old 01 September 2013, 03:22   #9
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Might get flamed for this but scoot over to Amibay.

There are people over there that have fixed their own monitors.

Sure I read a nice thread a weeks back where a chap fixed his 8833MkII with a new flyback and its now working good as new

Keeping it local (in the uk) and within the community will mean its repaired and done right! TV Repair shops just seem to come out with the same answer everytime "CHUCK IN THE BIN!" I really hate that one with a vengeance!!!!

lol grump mode over.
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Old 01 September 2013, 09:01   #10
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Well here's a thread where we're telling him to replace the flyback, someone even pasted a link to an online store selling them. :-D

But thanks for the amibay advertisement anyway. ;-)
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Old 01 September 2013, 10:55   #11
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Sure, get an amateur to replace a flyback without warning them of things like accumulated charge in the ultor cap. Electronic techs get paid for a reason.
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Old 01 September 2013, 19:03   #12
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Quote:
Originally Posted by trydowave View Post
Hi all. I was just playing a game on the ol Commodore 1084S monitor and the screen went blank and it started to make this high pitch squealing sound. I turned it off and back on but I got the same thing again?

Does anyone know if this is the sign of a dead tube?

Cheers
Tony
Most probably the LOPT (a.k.a. Flyback). When the Flyback dies, most times also brings the switching transistor down to the grave with it all along.

What I'd do: check the flyback, then the transistor (inside the shield at the back of the CRT), then any old capacitors. I'd probably end up replacing them all.

A word of advice though: if you never knew about flybacks and high-voltages, you shouldn't try to go and replace it yourself. Give it to an experienced technician.

Last edited by pkersey; 01 September 2013 at 19:11.
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Old 01 September 2013, 20:19   #13
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Quote:
Originally Posted by Loedown View Post
Sure, get an amateur to replace a flyback without warning them of things like accumulated charge in the ultor cap. Electronic techs get paid for a reason.
Yes that is true! so get out there and find a good competent person who is qualified. It just seems alot of them these days cannot be arsed or will charge some ott price for the sake of it. Maybe it is only around the area I live? its this throw-away attitude I do not like!

Anyway be safe and go with the chap that is trained up. Shame as there was a guy who ran a tv shop across the road from me but he retired 6years ago

He was a good guy n all!
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Old 01 September 2013, 21:38   #14
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Sure, get an amateur to replace a flyback without warning them of things like accumulated charge in the ultor cap. Electronic techs get paid for a reason.
I'm not a professional, but yet somehow I have managed to fix a bunch of monitors and have discharged many tubes without dying.

Sure, there's lethal voltage in there and if you don't know what you're doing / are not comfortable with the thought, leave it to the pros.

But even then, it doesn't mean that it is impossible to do at home. These are relatively stupid devices after all, well within the understanding of a hobbyist.

There's people doing stuff inside Amiga power supplies and yet no-one bats an eyelid. If you're careless, there's mains voltage present in a PSU and a lot of it, since the fuse doesn't give up that easily when you manage to complete the mains circuit with your body. Now when we're talking about the charges stored in CRT monitors, it's suddenly a lot more lethal? You unplug both before working in there and in the case of a CRT, you also discharge the tube before doing anything.

Last edited by Jope; 01 September 2013 at 21:43.
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Old 03 September 2013, 07:39   #15
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The word lethal is often thrown around when CRT monitor repair is being discussed. I wouldn't be surprised if no one has ever died from being shocked by one, I'm certainly not suggesting it isn't unpleasant but it's unlikely to kill you or cause you any sort of permanent injury.

Discharge correctly, and it's as no more dangerous than working on any other piece of electronic equipment. Of course, I don't know why you would waste your time with one of these things when a far better CRT TV can be obtained for nothing.
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Old 03 September 2013, 07:56   #16
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I'm not a professional, but yet somehow I have managed to fix a bunch of monitors and have discharged many tubes without dying.

Sure, there's lethal voltage in there and if you don't know what you're doing / are not comfortable with the thought, leave it to the pros.

But even then, it doesn't mean that it is impossible to do at home. These are relatively stupid devices after all, well within the understanding of a hobbyist.

There's people doing stuff inside Amiga power supplies and yet no-one bats an eyelid. If you're careless, there's mains voltage present in a PSU and a lot of it, since the fuse doesn't give up that easily when you manage to complete the mains circuit with your body. Now when we're talking about the charges stored in CRT monitors, it's suddenly a lot more lethal? You unplug both before working in there and in the case of a CRT, you also discharge the tube before doing anything.
The difference between a well designed PSU and a CRT is that the PSU will drain the mains cap(s) in a matter of seconds as opposed to a CRT that can store a nasty charge for some considerable time. My responses aren't designed to be offensive but I am the sort of person who is always blunt.
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Old 03 September 2013, 15:52   #17
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Quote:
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The difference between a well designed PSU and a CRT is that the PSU will drain the mains cap(s) in a matter of seconds as opposed to a CRT that can store a nasty charge for some considerable time. My responses aren't designed to be offensive but I am the sort of person who is always blunt.
Then again many CRTs have discharge circuitry in them that discharges the tube on powerdown. (can't remember for sure about the 1084 and am too lazy to look it up)

Naturally if your chassis is borked, there's a big chance that the tube is still charged, hence it must be always be discharged before any work is to be done.. So yes, but not always.

I'm sort of on the same lines as Hewitson that it isn't quite as lethal as people say. I've never tried it myself and don't recommend it, but most professional TV repairmen have been zapped a few times in their life.. :-)
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Old 03 September 2013, 21:31   #18
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i was always told amps were more dangerous than voltage,but then again ive never been struck by lightning.

i think its better to discharge the tube before working on it.
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Old 03 September 2013, 21:51   #19
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Agree with some of the comments on here, like anything, don't just leap in there but do the research so you know what you're doing (particularly the discharge bit) and you will be fine.

As for TV repair people I'm afraid it's a dying art, and the only people left in the industry are making no money or rightly charge a fortune for their services. No more repairing 20 sets a day for £30 a time and making money. No wonder people are advising to chuck them. Blame the supermarkets!

Lastly, a BIG TV? have you actually LOOKED at the picture quality from one of these monitors? It far exceeds anything I've ever seen from any TV. I even used to watch TV through one it's that good. I dunno why, perhaps the tubes were a completely different grade.
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