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Old 09 October 2012, 14:04   #1
Akira
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A1200 composite video plug faulty

I have noticed that my composite video plug has gone faulty. The full brightness or proper colors of the screen are not displayed until I move the plug a bit around . It's not a cable problem as this has happened with other cables.

Is this a cold solder on the composite plug, it broke or what? And how would I fix it?
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Old 09 October 2012, 15:06   #2
grobda
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quite possibly a 'dry joint' ie the solder is broken around the contact. solution is to take out the motherboard and reflow the joint - that is melt the solder so it makes a proper contact again. it can be helpful to melt a little extra solder in.

its not a tough job, just needs care dissembling the amiga, preferably with an esd wristband on, and not to be a complete doofus with the soldering iron.
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Old 09 October 2012, 15:06   #3
pandy71
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Quote:
Originally Posted by Akira View Post
I have noticed that my composite video plug has gone faulty. The full brightness or proper colors of the screen are not displayed until I move the plug a bit around . It's not a cable problem as this has happened with other cables.

Is this a cold solder on the composite plug, it broke or what? And how would I fix it?
Cold joint, broken joint - inspect soldering areas around plug with magnifying glass or perhaps just resolder (only resin and soldering iron required)
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Old 09 October 2012, 15:24   #4
Akira
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Thanks guys, I have no fear of soldering irons anymore, I have done much worse jobs with these Amigas

I will give it a try this weekend and see how it works!
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Old 09 October 2012, 16:07   #5
roy bates
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it could also be the inside of the actual socket,if you look closely inside the socket theres a part that touches the centre pin on the phono plug.

if you can see it through the socket then its ok if its too far too the right or left obviosly it wont touch the centre of the plug.
#its the left side of the socket#

if its not that then its a bad solder joint,or an electrical problem.

Last edited by roy bates; 09 October 2012 at 16:28.
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Old 12 October 2012, 02:37   #6
8bitbubsy
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When resoldering, for best result remove all the old solder, and resolder with leaded rosin core tin using a high-wattage iron, because the ground plane needs stable and warm heat to desolder.
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