Monitor 1081 problem

Jan · 24 November 2002, 21:27

Sometimes and without any warning my Commodore 1081 monitor completely loses its picture. It's like somebody pulled the plug, the screen goes black, but the sound still works. After punching and hitting the monitor a little (just a little!

), the screen often returns, but only to go black after a while again.

When I opened the case I noticed a spool which is glowing when the monitor works correctly, but once the screen goes black, the glowing stops. Somewhere in the monitor there must be a loose contact that is causing this picture failure. Somebody told me that this monitor has certain solder spots that often broke, which could cause this problem. But does anybody know where these spots are?

Maybe somebody has experienced the same problem on his monitor or just heard about this problem and can help me here?

Toni Wilen · 24 November 2002, 21:36

Resolder line output transformer's connections (=large transformer that is connected to tube with fat red wire)

This is very very common problem..

LordBug · 25 November 2002, 00:24

Be very careful playing near the fly-back transformer (the one Toni mentioned). It has about 15000 volts coming off of it. Some parts near it (like the capicitors) might be charged that high too. Let it sit unplugged for a few days before doing anything.

Jan · 25 November 2002, 02:00

Yeah I have a lot of respect for these monitors

. My uncle is an electrician and he told me that they sometimes even after days still contain enough electricity to blow your lights out forever

. So I'll be careful, and thanks for your help

.

Jan · 25 November 2002, 02:30

Hmm, seems I need some more help as I can't figure out what Toni's referring to. I've attached a picture of my 1081, can anyone tell me what needs to be fixed?

Toni Wilen · 25 November 2002, 08:29

Oops. It is gray not red wire. (I forgot because most tv's and monitor's use red wire) Follow the wire from tube's "suction cup"-connector and you'll find the transformer

Monitor is safe to operate if you don't go near the "suction cup"-connector. (it could still have 20+kv high voltage..)

Jan · 25 November 2002, 14:13

Just to be on the safe side here

If I'm not mistaken, this should be the transformer, right?
And these...

...solder spots inside the square should be the ones that I have to re-solder? All spots? That's strange because I don't see anything broken there. Is it just that I have to put solder on all those spots again and everything should be fine?

Toni Wilen · 25 November 2002, 14:24

Quote:

solder spots inside the square should be the ones that I have to re-solder? All spots? That's strange because I don't see anything broken there. Is it just that I have to put solder on all those spots again and everything should be fine?

Usually but not always there are visible circular cracks in solder. Resolder them and also look other nearby larger solder pads with magnifying class. (especially those that connect to heatsinked components)

e5frog · 06 August 2015, 05:10

Fixed one of those today, it was a 1081, it worked for about a minute or so then the glow disappeared from the neck and image slowly faded. Waiting a few minutes and turning it on made it work again - for about as long. Tried swapping PSU with a working 1081, and I thought the problem was fixed but after 10 minutes it faded down again just like before.

When inspecting the solder joint on this well screwed down flyback I saw several cracks around the pins after resolder I haven't had any problems for the last eight hours of on-time. Problem seems to be fixed.

Dripped some iso in the back pots an exercised them as well as there was some flicker when turning them. Final detail was adjustment of the neck rings, there was a little bleeding of colors.

Now everything is fine.

24 November 2002, 21:27	#1
Jan Junior Member Join Date: Aug 2002 Location: here Posts: 140	Monitor 1081 problem Sometimes and without any warning my Commodore 1081 monitor completely loses its picture. It's like somebody pulled the plug, the screen goes black, but the sound still works. After punching and hitting the monitor a little (just a little! ), the screen often returns, but only to go black after a while again. When I opened the case I noticed a spool which is glowing when the monitor works correctly, but once the screen goes black, the glowing stops. Somewhere in the monitor there must be a loose contact that is causing this picture failure. Somebody told me that this monitor has certain solder spots that often broke, which could cause this problem. But does anybody know where these spots are? Maybe somebody has experienced the same problem on his monitor or just heard about this problem and can help me here?

25 November 2002, 02:30	#5
Jan Junior Member Join Date: Aug 2002 Location: here Posts: 140	Hmm, seems I need some more help as I can't figure out what Toni's referring to. I've attached a picture of my 1081, can anyone tell me what needs to be fixed? Attached Thumbnails

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24 November 2002, 21:36	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,515	Resolder line output transformer's connections (=large transformer that is connected to tube with fat red wire) This is very very common problem..

25 November 2002, 00:24	#3
LordBug Registered User Join Date: Jul 2002 Location: Someplace Posts: 88	Be very careful playing near the fly-back transformer (the one Toni mentioned). It has about 15000 volts coming off of it. Some parts near it (like the capicitors) might be charged that high too. Let it sit unplugged for a few days before doing anything.

25 November 2002, 02:00	#4
Jan Junior Member Join Date: Aug 2002 Location: here Posts: 140	Yeah I have a lot of respect for these monitors . My uncle is an electrician and he told me that they sometimes even after days still contain enough electricity to blow your lights out forever . So I'll be careful, and thanks for your help .

25 November 2002, 08:29	#6
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,515	Oops. It is gray not red wire. (I forgot because most tv's and monitor's use red wire) Follow the wire from tube's "suction cup"-connector and you'll find the transformer Monitor is safe to operate if you don't go near the "suction cup"-connector. (it could still have 20+kv high voltage..)

25 November 2002, 14:13	#7
Jan Junior Member Join Date: Aug 2002 Location: here Posts: 140	Just to be on the safe side here If I'm not mistaken, this should be the transformer, right? And these... ...solder spots inside the square should be the ones that I have to re-solder? All spots? That's strange because I don't see anything broken there. Is it just that I have to put solder on all those spots again and everything should be fine?

06 August 2015, 05:10	#9
e5frog The Headstrong Join Date: May 2010 Location: Älvängen / Sweden Age: 49 Posts: 273	Fixed one of those today, it was a 1081, it worked for about a minute or so then the glow disappeared from the neck and image slowly faded. Waiting a few minutes and turning it on made it work again - for about as long. Tried swapping PSU with a working 1081, and I thought the problem was fixed but after 10 minutes it faded down again just like before. When inspecting the solder joint on this well screwed down flyback I saw several cracks around the pins after resolder I haven't had any problems for the last eight hours of on-time. Problem seems to be fixed. Dripped some iso in the back pots an exercised them as well as there was some flicker when turning them. Final detail was adjustment of the neck rings, there was a little bleeding of colors. Now everything is fine.

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