Re: Samsung LNT3242HX/XAA T-Con and power supply issues

Well, all of the obviously failed caps were made by a single manufacturer that I had never heard of, which strongly suggests that these failed because of a bad electrolyte formula (capacitor plague), rather than because somebody at Samsung under-specified the components. They're from the right era for capacitor plague.

As for not swelling, that's true, but usually if small caps fail because of hydrogen pressure, they blow the vent and spew electrolyte everywhere, or else they blow the bottom cap and spew electrolyte...

None of the small caps look swollen. Of course, that doesn't mean they aren't bad, necessarily....

Re: Samsung LNT3242HX/XAA T-Con and power supply issues

Oh, I forgot to mention that the picture looks normal for the first second or two. And after leaving it unplugged, it looks normal for as much as ten or fifteen seconds before the rising blue wipes out all deep blacks. This makes me wonder if the failure could be thermal in nature, like a bad solder joint somewhere, but I have no idea where to begin looking, and SMT soldering is really not my thing. :-D

In January, I did a partial recap of my LNT3242HX/XAA because it would not power on. Several caps were swollen, and out of an abundance of caution I replaced every cap on the board that was made by that manufacturer (except possibly some tiny ones that are pretty unlikely to fail). A couple of weeks ago, the set started misbehaving, with the blackest parts of the picture bizarrely showing up as bright cyan. The picture is otherwise normal except for those cyan sparkles in black areas (or cyan over the entire screen if you unplug the HDMI cable).

Suspecting a bad T-Con board, I ordered...

Re: New Members - please post your introductions here

Hi. I'm joining the board to ask about a T-CON failure shortly after a power supply failure, and a general question about supply ripple tolerances in a Samsung TV. I'm a software engineer by trade, but I've recapped a fair number of things in my day.