English Amiga Board Amiga Lore



Go Back   English Amiga Board > Support > support.Hardware

 
 
Thread Tools
Old 24 November 2002, 21:27   #1
Jan
Junior Member
Jan's Avatar
 
Join Date: Aug 2002
Location: here
Posts: 140
Question 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?
Jan is offline  
AdSense AdSense  
Advertisement:
Old 24 November 2002, 21:36   #2
Toni Wilen
WinUAE developer
 
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 39
Posts: 13,412
Resolder line output transformer's connections (=large transformer that is connected to tube with fat red wire)

This is very very common problem..
Toni Wilen is offline  
Old 25 November 2002, 00:24   #3
LordBug
Registered User
LordBug's Avatar
 
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.
LordBug is offline  
Old 25 November 2002, 02:00   #4
Jan
Junior Member
Jan's Avatar
 
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 .
Jan is offline  
Old 25 November 2002, 02:30   #5
Jan
Junior Member
Jan's Avatar
 
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
Click image for larger version

Name:	dscf0007.jpg
Views:	157
Size:	85.8 KB
ID:	4147  
Jan is offline  
Old 25 November 2002, 08:29   #6
Toni Wilen
WinUAE developer
 
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 39
Posts: 13,412
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..)
Toni Wilen is offline  
Old 25 November 2002, 14:13   #7
Jan
Junior Member
Jan's Avatar
 
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?
Jan is offline  
Old 25 November 2002, 14:24   #8
Toni Wilen
WinUAE developer
 
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 39
Posts: 13,412
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)
Toni Wilen is offline  
AdSense AdSense  
Advertisement:
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sell: 1081 Monitor Loedown MarketPlace 0 10 January 2010 06:56
For Sale/Trade: Amiga 1081 Monitor Fingerlickin_B MarketPlace 0 24 December 2009 05:37
Amiga Monitor 1081 does not turn on dir_marillion support.Hardware 16 06 February 2009 13:39
Trade: 1081 Monitor for What You Got Fingerlickin_B MarketPlace 0 01 December 2008 00:29
1081 monitor - no analog RGB Sune Salminen support.Hardware 5 20 September 2005 19:11

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 02:13.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Page generated in 0.20178 seconds with 12 queries