Re: 10 year old Vizio VO370M has intermittent flickering backlight
The tubes are snapped in with clips soldered directly to the inverter board, and the snaps are definitely making contact - it's very hard to remove each tube from the clip. I think the contacts are good, actually.
Thanks for all the advice. The idea of filming while testing is a great one, I'll try that next time I try to fix something like this. Even if I haven't fixed this one I'm definitely learning some useful skills!
I'm going to call it on this one and send it to the recycler.
xeos
Member
Last Activity: 11-05-2021, 03:46 PM
Joined: 04-26-2014
Location: ca
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Re: 10 year old Vizio VO370M has intermittent flickering backlight
I took photos by quadrants starting where you requested. In doing so I noticed something that might be an issue: some of the joints looks pitted almost like the solder didn't melt completely? see last two photos for closeup. There's no evidence that these joints are loose and the holes are tiny so I'd be surprised that they don't work, or that they would only work intermittently, but it's a place to start. See anything else worth touching up at the same time? The area with the transformers looks perfect, none of...Leave a comment:
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Re: 10 year old Vizio VO370M has intermittent flickering backlight
Where would you measure if you had a good meter? The largest cap, or somewhere else?Leave a comment:
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Re: 10 year old Vizio VO370M has intermittent flickering backlight
I'm not sure how a digital meter differs from a volt meter / multimeter? are you saying something like a low-end oscilloscope?
I do not have any schematics.Leave a comment:
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Re: 10 year old Vizio VO370M has intermittent flickering backlight
I'm trying my best to parse that message but either I'm misunderstanding what you are saying, or perhaps it was voice transcribed and one or more of the words was autocorrected wrong?
I think what you mean is the power supply could be the cause and if I measured in the right place I'd see a change in voltage? unfortunately, my voltmeter doesn't see any change in voltage, but it has a serious lowpass filter that would probably hide anything slightly transitory.Leave a comment:
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Re: 10 year old Vizio VO370M has intermittent flickering backlight
entire screen.Leave a comment:
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Re: 10 year old Vizio VO370M has intermittent flickering backlight
Very interesting. I can confirm that the tubes are snapped into this model as well. But they are snapped tight, no loose ones. In fact it was quite a challenge to remove the CCFL driver board they were so tight.Leave a comment:
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Re: 10 year old Vizio VO370M has intermittent flickering backlight
Thanks for the suggestion!
caps all look flat - though the metal heat sink makes it a royal pain to check. I can us my T4 super-budget esr meter to check further but it will take a lot of desoldering given that heatsink placement :-(
I don't see any solder cracks.
Voltage looks steady, but my voltmeter has a pretty heavy lowpass filter so it would need to be flickering at like 1hz to see anything. This flicker is more like 20-30hz.Leave a comment:
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Re: 10 year old Vizio VO370M has intermittent flickering backlight
power and mainboard attached....Leave a comment:
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10 year old Vizio VO370M has intermittent flickering backlight
I have this Vizio VO370M TV that I'd like to save because it has very low input lag (as good as the most expensive TVs sold today!, [url]https://alantechreview.blogspot.com/2020/09/vizio-vo370m-review-input-lag.html[/url]), but it has a very annoying issue: sometimes the backlight flickers (or is just kind of dim). The flicker is slower than 60hz, so we aren't just talking some kind of motion compensation).
I was hoping maybe it was a power board issue (aka failing caps) but I opened it up and I don't see any that look bad. I have a budget capacitance/ESR meter if it's worth checking... -
Re: Extra lines and missing lines in Samsung ln46c630; panel looks fine
ps the panel exhibits what I can only call spreading: if you draw some bright rectangles in one region the pixels near it will gradually gain in brightness too over the period of a few seconds, like the pixel "whiteness" is diffusing out to nearby pixels.Leave a comment:
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Re: Extra lines and missing lines in Samsung ln46c630; panel looks fine
it's very hard to see said board, and it's not clear what parts (all of them?) I might need to remove in order to get to it. But there's no sign of water ingress anywhere around the bottom of the set, no rusty metal on stains.
meanwhile, I think you are right about the panel being the issue. The T-con has two output ribbons cables so I tried unplugging each in turn. While the majority of the unplugged side was black/blank the horizontal lines did not completely disappear. I've not actually seen...Leave a comment:
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Re: Extra lines and missing lines in Samsung ln46c630; panel looks fine
ps I read [url]https://www.badcaps.net/forum/showthread.php?t=43030&highlight=ln46c630[/url], and tried tapping all over the main board with no change to the lines whatsoever. I didn't try heating any components.Re: Extra lines and missing lines in...ating any compLeave a comment:
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Extra lines and missing lines in Samsung ln46c630; panel looks fine
I have a Samsung smart TV, ln46c630 from 2011, with both vertical and horizontal lines corrupted. The panel looks physically fine, as does the rest of the tv housing. I got it from somebody who was putting it out for recycling pickup so I don't know the history, other than their comment that it WAS NOT dropped. Pictures attached of the issue and the boards inside. Yes, the board are abnormally dusty. But nothing obviously burnt or any bad caps.
At the least it seems like the power supply is good since I'm getting a well lit picture and the set seems to work properly, what I can... -
Re: Samsung UN46H6201 TV: is power board or LED failing?
Here's the model number of the board. Sorry the other photo wasn't sharp enough.
The backlight does not come up when the other boards are not connected (just the LEDs). But the board isn't putting out 42vdc or whatever one should expect on those pins so I'm not sure that's a definitive test of the backlights being the issue. Like I say it *looks* like rather than a "short" 3 of the strips failed "open"....Leave a comment:
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Re: Samsung UN46H6201 TV: is power board or LED failing?
I just want to add that I've already had feedback on my poor LED testing methodology:
[INDENT]neilc6
Badcaps Veteran
Default Re: Samsung UN46H203AF Bad Backlights and Bad Power Supply
You cannot test LED strings by measuring resistance though you can test individually for shorts. You need to put in diode mode and test each one individually or use a LED tester. With this model, you will likely have 80 to 90% of them shorted.[/INDENT]
HOWEVER, if the strip tests open, doesn't...Leave a comment:
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Samsung UN46H6201 TV: is power board or LED failing?
I have a UN46H6201 with (at least) a dead backlight. It will power on and display a faintly visible setup image when illuminated by a flashlight, so I'm pretty sure the mainboard and tcon are fine. The question is if I need to replace the LEDs and or power board, or both just to be safe?
The board does not appear to be powering the LEDs. If I check the connector 6203 in the first photo, I find that there's only about half a volt between pins 11 and 10 (is that the right way to test? are these in series or parallel? I've been hesitant to poke around and test all pin combos because... -
Re: how often are bad capacitors responsible for LED monitor failures?
Fair point. If they are unrepairable you'd see more tossed, eh? Meanwhile a pretty nice TV costs $200, which is wicked cheap. It's hard to get excited about repairing now that it's getting complex. I still hate the waste, though.Leave a comment:
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Re: how often are bad capacitors responsible for LED monitor failures?
idk I see a lot of tvs thrown away. I don't think self repair is a big concern for them.Leave a comment:
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Re: Samsung UN46H203AF Bad Backlights and Bad Power Supply
I tried this test: plugging in the power board to teh LEDs but not to the mainboard. LEDs do not light. I tried measuring VDC on the pins supplying power to the LED strips. It was not easy to make good contact but best as I could tell there was only half a volt between the + and - pins. Meanwhile, the singed diode showed 280vdc, and the oversized blue 450v/100uf cap showed 380vdc. so it seems like it's not delivering power to the LEDs.Leave a comment:
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