"N_Cook" wrote in message
...
Half hour into a presentation , a varying small section of the picture
would break . Perhaps due to PbF problem , but did not seem to be
vibration sensitive. If anything , it varied with picture content.
About 90 percent of the image was sync'd properly, and the interference
moved about , so the information was there.

RoHS solder is a likely suspect - while you go over the soldering, watch out
for nasty smells when you heat electrolytic capacitor leads.

Its often the smaller electrolytics that can cause this sort of thing, and
the end seal often leaks around one of the leads - sometimes that lead
corrodes right through.

The best I can describe the smell; a sort of cross between burning rubber
and cat pee.