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#1 |
New Member
Join Date: Jul 2015
City & State: Wisconsin
My Country: usa
I'm a: Knowledge Seeker
Posts: 7
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![]() Hi Folks
I'm in need of some direction regarding cap replacement.After 12 trouble free years of bang and boom,my JBL E250P blew out C72 (6.8uf 100v non-polar blah,blah, blah) you guys know the deal here. If understand correctly,guys are replacing this cap with a film cap.I will no doubt ask some stupid questions but it can't be helped. After all the searching I'm getting bug eyed,a headache and pulling out whats left of my hair. So,let the fun begin,is this what I'm looking for? http://www.digikey.com/product-detai...F1685-ND/56410 Here come some stupid questions. 1. How to tell the polarized from non-polarized film caps,if they come both ways that is,I don't see anything in the specs (warned you about the ?'s) 2. Does lead length and spacing matter here? 3. How close to the board should these be attached. Thanks |
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#2 |
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: 20,082
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![]() film caps arent polarised
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#3 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 34,692
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![]() If you look at the old electrolytics bi-polar original cap, you will see that it is a lot smaller than the replacement film cap type, JBL uses the electrolytics type because it is cheaper but they do not last, that cap is part of the Class D power amplifier output filter cap.
You should also replace the C73 4.7uF at the same time. See service manual. See if you have room to put those two new caps in place of the old one, just try to keep the lead length as short as possible and you will be fine. JBL is not the only company that cheap out on these caps by using electrolytics in stead of film caps. I have seen so many failure of these caps in the output filter section of these Class D amplifiers.
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Never stop learning Basic LCD TV and Monitor troubleshooting guides. http://www.badcaps.net/forum/showthr...956#post305956 Voltage Regulator (LDO) testing: http://www.badcaps.net/forum/showthr...999#post300999 Inverter testing using old CFL: http://www.badcaps.net/forum/showthr...er+testing+cfl Tear down pictures : Hit the ">" Show Albums and stories" on the left side http://s807.photobucket.com/user/budm/library/ TV Factory reset codes listing: http://www.badcaps.net/forum/showthread.php?t=24809 Last edited by budm; 07-25-2015 at 09:57 PM.. |
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#4 | |
New Member
Join Date: Jul 2015
City & State: Wisconsin
My Country: usa
I'm a: Knowledge Seeker
Posts: 7
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![]() Quote:
Thanks to all for getting back. |
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#5 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 34,692
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![]() I do not see any TECH TIP in the service manual regarding to the cap values changed from what are shown in the diagram, may be you should contact JBL to see if they release any service bulletin for this model.
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#6 |
New Member
Join Date: Jul 2015
City & State: Wisconsin
My Country: usa
I'm a: Knowledge Seeker
Posts: 7
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![]() It's all over the net,but does not bother me.Right now trying to find film replacement for C73 4.7uf 50v but the filters show 100 and 250 for options,is ok to go higher on the volts?
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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: 20,082
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![]() yes, if you can make it fit.
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#8 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 34,692
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![]() Is your chirping? To go 10 times less capacitance seems like a big change that I would think JBL will have service bulletin out.
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#9 |
New Member
Join Date: Jul 2015
City & State: Wisconsin
My Country: usa
I'm a: Knowledge Seeker
Posts: 7
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![]() They all do it,but I think it's by design.Someone may have figured out a way to quiet it down.How about the other part of my question about the volts on the 4.7 C73.Thanks
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#10 |
New Member
Join Date: Jul 2015
City & State: Wisconsin
My Country: usa
I'm a: Knowledge Seeker
Posts: 7
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![]() They all do it,but I think it's by design.Someone may have figured out a way to quiet it down.How about the other part of my question about the volts on the 4.7 C73.Thanks
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#11 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 34,692
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![]() Higher Voltage is fine but the body size will increase with the higher Voltage rating.
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#12 |
New Member
Join Date: Jul 2015
City & State: Wisconsin
My Country: usa
I'm a: Knowledge Seeker
Posts: 7
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![]() Thanks for help guys,I may end up going with a known good brand elec for C73 just save one headache.
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#13 |
New Member
Join Date: Dec 2018
City & State: Hamburg
My Country: United States
I'm a: Knowledge Seeker
Posts: 2
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![]() I know this very helpful post is 3+ years old. Apparently Film type capacitors have gone down in price because unlike what was posted in terms of JBL being too chip to use Film type caps, film caps seem to be a LOT less expensive than the older type. I can buy 100 Film type capacitors for less than I can buy 1 Electrolytic capacitor with the same rating. It has me concerned now that I am not buying the right thing. Oh well what's the worst that can happen? Fry the rest of the Amp board? Its not working anyway. Electrocute myself? Can't find the upside to that one. Burn down my house and the houses surrounding mine? I'm insured.
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#14 | |
New Member
Join Date: Dec 2018
City & State: Hamburg
My Country: United States
I'm a: Knowledge Seeker
Posts: 2
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![]() Quote:
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#15 |
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: 20,082
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![]() polypropylene film.
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#16 |
Badcaps Veteran
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 1,151
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![]() Polypropylene are hard to find in low voltage. They are usually >250V and physically big, and ~4X the cost of Polyester/Mylar.
Anyone know what this cap does in the JBL? Crossover? |
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