never had one of these, that’s a capacitor, right? also don’t know what capacitance this is, tried searching but came up short
edit: OK, since it’s 1000V I guess this isn’t electronics, askelectrics doesn’t exist yet?
edit 2: top view
edit 3: the whole mess
(dogdammit lemmy, can’t you tell me what image size isn’t too large, I hafta guess?!)
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The Yellow “Carlo DMB” is a capacitor, yes. The 1000V marking tells you it can be charged up to 1000 Volts!!! That can be dangerous!
For me it looked burned from the outside, but its hard to tell from the picture. Looks like something went very hot around it.
added top view in OP, all the other components that looked charred got cleaned up with a brush, this is the only one which looked damaged. currently waiting for the TV to empty all the capacitors before I attempt to remove the board.
The capacitor rating is 203j, that’s 0.02uf at 5%. It doesn’t LOOK burnt to me. Is this a CRT board?
thank you! isn’t CRT, it’s a LED TV power supply.
I’m reaching my limit here (I do small electronics) but that cap looks like it’s on the primary side of power in, so it’s rated for power line in. (Hence the high voltage rating).
What is the tv doing/not doing? If any of the LEDs (power led) turn on at all, I would guess that it’s not that side of the circuit. (I don’t know much about TVs, but these are always the questions I ask for troubleshooting)
Edit: looking at the debris near that part, something went. is the fuse okay? Is the mess localized around there?
fuse OK. turns on, backlight works, image has lines all over and after a while (30 sec when left overnight off power, 10-15 secs when left a couple hours) it starts fading the image to black with the backlight still on. inspected visually all components, this is the only one that looks suspicious.
And the end of the electrolytic cap looks okay? (The blue can). If that thing spit out over all the parts, maybe it can explain the mess.
Otherwise, it feels like something is heating up in an undesired way. This could be something downstream of some filtering capacitor that is now dead?
If you had a thermal camera, it would tell you a lot, but not necessarily point at the bad part. Can you get more run time with a fan? (Not a permanent solution)
sounds like the tft panel connection is not good anymore? connection of the tft driver to the panel. maybe fpc directly soldered on driver board. device heats up and connection goes bad until fade to black?
The fact that a capacitor is marked with a 1000V label does not necessarily mean that 1000V are present on its terminal (but you should use caution). I don’t think the voltage makes it out of the realm of electronics.
It’s quite hard to answer your question, as the board is quite dirty and you provided a single picture. You could check for continuity and capacitance value with a multimeter
Hard to tell, a couple of the other components also look dirty. Are they just dusty, or is there some residue from a blown-up part?
What device are we looking at? I’m guessing some kind of power supply? What is the failure mode You’re trying to fix?
TV power supply. added top view in OP, a buncha surrounding components were dirty as well but a brush cleaned them up. this is the only one that seems burned. at this point I’m just looking for obviously busted stuff.
Don’t want to segue too much, but is your goal here to repair the board or to repair the TV?
Nothing really looks totally busted, but the board has several parts that look mildly rough. Like I hate that fuse, but is it just dirty? If your goal is to do your part to not contribute more ewaste to the world and learn new things, I love it, but if you just want a working TV… new boards can frequently be crazy cheap, may be a plan especially if not sure what’s actually wrong with this one.
got this thing almost free so I’m taking my time. can’t afford to call a repairdude so I’m looking into learning how to fix it. had success with a previous find, replaced a coupla caps for backlight and got an awesome TV for less than $2.
so step 1, look for obviously busted caps and burned out shit and this post is to that end. if that fails, I’m on to step 2, determine if this can be repaired at all; like, if it’s the panel, give up right there. maybe learn something for the next one. and on and on.
If that’s the case, I’d replace the fuse at least if you can get one cheap. Good luck sourcing that cap though, probably looking at finding one with compatible specs instead of the exact part and if you choose right that’s probably fine. I hate doing this kind of work, so probably better people to talk to, but from what I can see and if I had to fix it, I’d replace the fuse and then see how I feel.
Looking at the streaks around el28, could the large blue electrolytic have failed?
Or the orange guy next door.
Nothing looks burnt here, just heat marks, which would be totally expected after a few decades if the appliance heats a bit during normal use.
Capacitor like these rarely fail for no reason and if it was subject to over voltage you’d probably have a lot of other things fried, they’d be some of the last things I’d check.
I’d take the board off and try checking for the sneaky shite like tin whiskers or dry joints.