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#1 |
Badcaps Veteran
Join Date: Oct 2005
City & State: Rockhampton, Queensland, Australia
My Country: Australia
Line Voltage: 240VAC 50Hz
I'm a: Hobbyist
Posts: 2,011
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![]() https://www.productsafety.gov.au/rec...0%9D-smart-tvs
I can't seem to find any infomation about this problem affecting overseas models.
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My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics. |
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#2 |
Member
Join Date: Jun 2022
City & State: Nazareth, Pennsylvania
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Knowledge Seeker
Posts: 63
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![]() Can't be too safe, though, right?
I wonder if it was the design of the circuit board or the quality of / a defect in the capacitors. |
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#3 | |
master hoarder
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 11,249
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![]() Quote:
![]() I don't think the design of the circuit would be at fault here. At least according to the article, it's the X-caps that fail... and X-caps are only used to filter line RF / EMI to/from the TV. So they are connected to line voltage only. With that said, I'm more inclined to think the X-caps themselves are failing. But why? -Now that's another question. ![]() Would have been nice if these consumer warning sites provided more details. I'm sure an EE or qualified tech (or a team, rather) has already determined the issue. Would be nice if they shared details with the public, though. But I guess that will never happen. Unplug you TV and call tech support. ![]() ![]() |
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#4 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 29,107
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![]() maybe the voltage is underrated or they are before the switch.
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#5 |
Badcaps Veteran
Join Date: Aug 2005
City & State: San Jose, CA
My Country: USA, Unsure of Planet
Line Voltage: 120VAC, 60Hz & 115VAC, 400Hz
I'm a: Professional Tech
Posts: 3,505
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![]() I wonder if the problem is partly not doing well with lower quality power and/or lots of thunder storms, as some parts of Oz might have.
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#6 |
Badcaps Veteran
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 3,245
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![]() It's an old issue? bad quality X-caps that they already were giving free power board replacements back in 2020 for the issue.
I think it got escalated to recall status because the koreans just keep putting this kind of stuff off. Affected LG TVs are giving a pop-up recall message. Everything is downstream of the fuse... but... "T12A" ![]() So the cap does smoke bad when it breaks down and shorts, before the fuse pops I guess. "Certain 65” and 77” LG Smart TVs manufactured between February 2016 and September 2019. "Affected models include those manufactured in 2016: • 65E6 • 65G6 • 77G6 2017: • 65B7 • 65C7 • 65E7 • 65G7 • 65W7 • 77W7 2018: • 65W8 • 77C8 • 77W8 2019: • 65W9 • 77C9 • 77W9 |
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#7 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 29,107
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![]() 275v caps in a 250v country?
yea, that just screams "long service life" ![]() |
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#8 |
Badcaps Veteran
Join Date: Aug 2005
City & State: San Jose, CA
My Country: USA, Unsure of Planet
Line Voltage: 120VAC, 60Hz & 115VAC, 400Hz
I'm a: Professional Tech
Posts: 3,505
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![]() IIRC, back when agency-approved X caps were commonly rated for 250 VAC, European mains voltages could range up to 264 VAC. That said, even with a nominal 240 or 250 VAC, a 275 VAC cap is going to experience surges above that rating - due to inductive surges when motors kick in, due to large load changes, due to lightning, etc..
The failure mechanism here is cumulative over time. Surges cause arc-overs that "self heal" (= the metallization is cleared back from the hole) that leave a tiny amount of conductive carbon residue. These small conduction points accumulate until the cap heats into a sort of thermal runaway and sudden unpleasant things happen. |
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#9 |
Badcaps Veteran
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 3,245
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![]() The "275V" marking is part of the Class X2, meaning it's rated for use across mains, up to 275VAC plus transient overvoltages.
X2 is impulse rated to 2.5kV (X1 to 4kV) but there is a MOV first in the LG power supply it looks like to clamp far below that. The parts see mains all the time 24/7. So the caps are likely failing due to crappy quality. Like a Rifa situation. They are physically quite small for their ratings which is always too good to be true when they are half the size of competing parts. The recall is for 9,400 sets I think, just part of a production run. |
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#10 | |
Badcaps Veteran
Join Date: Jul 2004
City & State: North Springfield, Vermont
My Country: USA
Line Voltage: 118-127V 59-63.5 Hz-> actualizo: pérdido de voltaje
I'm a: Knowledge Seeker
Posts: 6,197
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![]() Quote:
A thunderstorm also killed the Crotched Mountain campus internet in July, 2001. The internet was down for easily roughly 1 week to possibly 2 weeks! ![]() That was on top of random power outages due to the at least one of the campus generators, along with PSNH (Public Service of New Hampshire) at that time. But most of the power troubles that were campus-generator-related, was mostly 2000 and maybe 2001, IIRC. The campus generator setup that they had, is famous for getting us through the ice storm of January, 1998!
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#11 |
Solder Sloth
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 8,138
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![]() Has anyone seen a fire caused by a Rifa?
I suppose the problem is that it causes bad publicity even if it doesn't cause a fire, it sure causes a lot of smoke that may imply fire but it never catches on fire. I've heard of plenty of old Tek scopes smoke up and keep ticking due to bad Rifas... of course people are scared if they will cause additional damage by running their scope after the Rifa goes up in flames... |
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#12 |
Badcaps Veteran
Join Date: Jul 2004
City & State: North Springfield, Vermont
My Country: USA
Line Voltage: 118-127V 59-63.5 Hz-> actualizo: pérdido de voltaje
I'm a: Knowledge Seeker
Posts: 6,197
|
![]() IIRC, saw them in videos. They are common in Apple IIs! (and Apple IIIs most likely)
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#13 |
Solder Sloth
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 8,138
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![]() Tektronix scopes too. I wonder if the spot welder has them ...
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