Proview 986m 19" monitor

The odor notwithstanding, the smoke and hissing suggest an outgassing capacitor.

If that's not it, there /has/ to be some visible problem.

Perhaps the rhinalogical equivalent of the "stethoscope" for tracking down mechanical squeeks. A drinking straw stuffed in a nostril ? Caps can outgas at the hidden pin face , not just the "cross-hair" weak spot.

Hiss usually = something formerly sealed discharging a gas. Maybe you missed something in your visual.

Found it. C635 10uf 250V bulging slightly on top and tiny trace of black at the X center. JR

I recently 'baked' a PNY video card to try to reflow some bad solder joints. Ended up with some electrolytic s that had a black dot over the X. Replace them and now the card works. It is an NVidia 8500 chipped card with a BGA GPU. Most of the caps looked ok. I suspect the ones that dotted were part of the problem. PNY isn't known to use reliable components since their card was much less expensive than the real NVidia counterpart.

I've once seen blown fbt which had tiny hole on side. It was hard to see but obviously there must be either that or some cap. An ESR meter is a must to find out these almost failed caps, make life much easier.

br ismo