Monitor needs to warm up

[neil324]

Ive a got jamma cabinet, not sure what monitor is fitted. When i turn it on there is no picture for a few minutes, it can also lose it once warmed up, especially when the cabinet is knocked.

Just wondering what the problem is, maybe a lose pot.

[grantspain]

sounds like you have a dry solder joint somewhere

[neil324]

Would'nt a dry soldering joint have reared its head before now though. Pretty easy to fix, the hard problems going to be finding it right. How would a go about finding it, with a multi meter, any tips where to start.

[Kevin Mullins]

Would'nt a dry soldering joint have reared its head before now though.

A "dry" joint is usually a weaker joint that eventually cracks enough to have a noticeable effect.

Pretty easy to fix, the hard problems going to be finding it right. How would a go about finding it, with a multi meter, any tips where to start.

Shouldn't be hard to find, usually can be found visibly.
Remove the old solder, re-solder, done.

As for where to start, most monitors will have some very common areas to check, but much easier to point out if we know what model monitor you have.

[neil324]

Can't seem to ID the chassis,any ideas?

Ok its a Kortek KTM-20
 

[kardenm]

had a similar problem on a K7901. Was caused by bad solder joints on the flyback. Just resolder them all and see if that helps.

[neil324]

Just had a look at the monitor, the chassis board looked ok so then had a look a the small board at the end of tube and a solder joint had lifted from the board re-soldered it and its working fine again.

Must admit don't like poking around a monitor, with all them 'high voltage' stickers every where

Thanks for the advice.