Samsung 305T, backlights work, black screen 90% of time
Hey folks, I have this neat older monitor that I'd like to preserve. It still has a very functional resolution and size (2560 x 1600 @ 30"). These are notorious for having overheating scaling chips on the T-con, yet I don't think that is my problem as the screen is simply black (or it occasionally works) and T-con failures are colorful, right? At least, there are telltale artifacts and such before they fail completely, correct? I never had any hint of it going bad. Just lots of instances where I would have to shut it off, fiddle with the DVI, and plug it back in to get a signal. I'm honestly not sure the plugging had any effect more than the power cycling. Although, if there is a bad connection in a solder somewhere, the plugging may have moved it slightly enough to make contact.
Taking it apart, I found some obviously bad caps on the PS board, so I recapped all the capxons except the large main cap and two Rubycons. This changed nothing. I since pulled the two Rubycons and the large main to test. The Rubycons (35V1000uf) test at Vloss 0.5~0.8, C is at ~930uf, and ESR is 0.00-0.01ohms. The main (450V150uf) tests at Vloss 1, C is ~135uf, and ESR is 0.46ohms. Should I replace these?
I'm starting to think the problem lies in the main, or the ribbon connectors.