Hey all -
This forum appears to be a great resource for my current project. I have done a lot of recapping on old video game systems, but I haven't tackled a power supply board or boards with voltages over 12.
Here we have the PS board for a Samsung 27" monitor from circa 2008. After a bit of flashing on first power-up occasionally over the past few years, it finally started requiring the main switch to be flipped at the AC input in order to get a picture just this past week. Even then, it would sometimes only show an image for a few seconds before powering down and cycling. Switching on and off a few more times could finally bring it back to life (until next power down). Now...it doesn't really want to power on. Smells like bad caps to me.
I have found a few threads here and there for the monitor board I am working on, and I thought I would describe my project/issue, post some pics, and also ask a couple of questions. Maybe this thread will help add to the Google results for anyone else in the future.
Questions first -
1: I have never actively discharged a large capacitor on a PCB. Do you guys tend to use a bleeder resistor for this sort of thing? I don't have any (yet). I imagine the only thing I need to worry about is the 450V 150uf, but I will differ to your other possible safety recommendations.
2: I have concerns about this... glue? (See pictures)
Plan is to replace all caps except the 450V unless additional suggestions/points are made. I can also add any pics if requested. Thanks!
This forum appears to be a great resource for my current project. I have done a lot of recapping on old video game systems, but I haven't tackled a power supply board or boards with voltages over 12.
Here we have the PS board for a Samsung 27" monitor from circa 2008. After a bit of flashing on first power-up occasionally over the past few years, it finally started requiring the main switch to be flipped at the AC input in order to get a picture just this past week. Even then, it would sometimes only show an image for a few seconds before powering down and cycling. Switching on and off a few more times could finally bring it back to life (until next power down). Now...it doesn't really want to power on. Smells like bad caps to me.
I have found a few threads here and there for the monitor board I am working on, and I thought I would describe my project/issue, post some pics, and also ask a couple of questions. Maybe this thread will help add to the Google results for anyone else in the future.
Questions first -
1: I have never actively discharged a large capacitor on a PCB. Do you guys tend to use a bleeder resistor for this sort of thing? I don't have any (yet). I imagine the only thing I need to worry about is the 450V 150uf, but I will differ to your other possible safety recommendations.
2: I have concerns about this... glue? (See pictures)
Plan is to replace all caps except the 450V unless additional suggestions/points are made. I can also add any pics if requested. Thanks!
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