Hello,

I have an old RGB Philips Monitor model CM11342 which all of a sudden started to shrink the display into one horizontal line after 10 minutes from being turned on and this for a few seconds.. Then each 40 to 60 sec the same think happens.
Any clue what could be wrong ? Any capacitors need to be replaced ?

Thanks,

Shad

Usually when its getting that bad I just replace the monitor. The older ones aren't really worth fixing unless its something really simple. If your attempting to fix it yourself also look for cold solder joints. They can cause a lot of problems.