Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old June 1st 19, 03:11 PM posted to sci.electronics.repair
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Default Bulging caps by design?

Getting inside a TV for the all too common reason, to divert the crappy
internal speakers to something decent, ie larger for some bass, externally.
3 caps on the ps marked "G-LUX" 470uF, 10V gold and black all with
exactly the same degree of bulge. No problem with the TV. Google images
shows none of that type. No other G-Lux examples on the boards to
compare with. They have the incised Y type of end to the cap.

While inside took some data, perhaps useful for someone sometime.
Beko 22WLP530HID, 2008
video board BEKO ELEKTRONIK XZT190-R-3
main ICs
NEC DE1115GM
Sony CXD1968BR
MSJ7286
D2516AETA
ps board Grundig XST194-1V-0
LG Display LC220WEI


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Old June 1st 19, 05:58 PM posted to sci.electronics.repair
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Default Bulging caps by design?

On Saturday, 1 June 2019 15:11:12 UTC+1, N_Cook wrote:
Getting inside a TV for the all too common reason, to divert the crappy
internal speakers to something decent, ie larger for some bass, externally.
3 caps on the ps marked "G-LUX" 470uF, 10V gold and black all with
exactly the same degree of bulge. No problem with the TV. Google images
shows none of that type. No other G-Lux examples on the boards to
compare with. They have the incised Y type of end to the cap.

While inside took some data, perhaps useful for someone sometime.
Beko 22WLP530HID, 2008
video board BEKO ELEKTRONIK XZT190-R-3
main ICs
NEC DE1115GM
Sony CXD1968BR
MSJ7286
D2516AETA
ps board Grundig XST194-1V-0
LG Display LC220WEI


Lytic caps don't bulge by design. If they're bulging, they're going into failure.


NT
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Old June 1st 19, 06:56 PM posted to sci.electronics.repair
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Default Bulging caps by design?

On Sat, 01 Jun 2019 15:11:10 +0100, N_Cook wrote:

Getting inside a TV for the all too common reason, to divert the crappy
internal speakers to something decent, ie larger for some bass, externally.
3 caps on the ps marked "G-LUX" 470uF, 10V gold and black all with
exactly the same degree of bulge. No problem with the TV. Google images
shows none of that type. No other G-Lux examples on the boards to
compare with. They have the incised Y type of end to the cap.

While inside took some data, perhaps useful for someone sometime.
Beko 22WLP530HID, 2008
video board BEKO ELEKTRONIK XZT190-R-3
main ICs
NEC DE1115GM
Sony CXD1968BR
MSJ7286
D2516AETA
ps board Grundig XST194-1V-0
LG Display LC220WEI

These caps are known for failing. Replace all of them.
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Old June 1st 19, 10:02 PM posted to sci.electronics.repair
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Default Bulging caps by design?

On Sat, 01 Jun 2019 15:11:10 +0100, N_Cook wrote:

Getting inside a TV for the all too common reason, to divert the crappy
internal speakers to something decent, ie larger for some bass, externally.


I prefer to use a hi-fi or entertainment contrivance that already has
proper external speakers and better bass/treble controls. I usually
need to couple it through an isolation xformer to avoid hummmmm caused
by a ground loop.

3 caps on the ps marked "G-LUX" 470uF, 10V gold and black all with
exactly the same degree of bulge.


G-Lux is the abrev for G-Luxon capacitors:
https://www.google.com/search?q=g-luxon+capacitors
They merged with Teapo Electronic Company of Taiwan in 2005:
http://www.teapo.com/Web-En/History-en.aspx
which means those caps were probably some of the first caps out of the
factory in China.

Beko 22WLP530HID, 2008


The TV is 11 years old. Maybe it's time to replace the bulging caps.
If you can make them fit, I suggest a higher voltage rating.
--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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Old June 2nd 19, 12:33 AM posted to sci.electronics.repair
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Default Bulging caps by design?

In article ,
says...

The TV is 11 years old. Maybe it's time to replace the bulging caps.
If you can make them fit, I suggest a higher voltage rating.



Higher voltage is ok, but higher temperature is probably better. I
think 105 deg C is the higher ones now.



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Old June 2nd 19, 03:33 AM posted to sci.electronics.repair
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Default Bulging caps by design?

On Sat, 1 Jun 2019 19:33:08 -0400, Ralph Mowery
wrote:

In article ,
says...

The TV is 11 years old. Maybe it's time to replace the bulging caps.
If you can make them fit, I suggest a higher voltage rating.


Higher voltage is ok, but higher temperature is probably better. I
think 105 deg C is the higher ones now.


Yep. 105C is better.

In computahs, I've been replacing bulging electrolytics with aluminum
polymer caps. They're substantially more expensive, but that's not an
issue for simple recapping of a motherboard, where the quantities of
caps used are small. Most of the better motherboards already use
polymer caps instead of electrolytics, especially near the rather warm
CPU. I have yet to replace a polymer capacitor, while electrolytic
replacements are epidemic.

Here's the Mouser selection of 470uf 16v polymer caps:
https://www.mouser.com/Passive-Components/Capacitors/Aluminum-Electrolytic-Capacitors/Aluminum-Organic-Polymer-Capacitors/_/N-bmaie?P=1z0wrk5Z1z0z7l5Z1yx4aw3
Unfortunately, 16v is as high a voltage that can be commonly found.
Mouser only has one cap rated at 25v:
https://www.mouser.com/ProductDetail/KEMET/A750MS477M1EAAE015?qs=M6jHmRuQorU%252BFZ0HJe9oAQ%3 D%3D

No clue what's happening in the TV business. My guess(tm) is that
they continue to use the cheapest parts possible on the assumption
that using expensive parts, which might outlast the other overheating
parts in the TV, is bad design economics.

"Bad Electrolytic Capacitor Teardown"
https://www.youtube.com/watch?v=tKphKWAkeSU (4:32)



--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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Old June 6th 19, 03:36 PM posted to sci.electronics.repair
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Default Bulging caps by design?



Getting inside a TV for the all too common reason, to divert the crappy
internal speakers to something decent, ie larger for some bass, externally.


I prefer to use a hi-fi or entertainment contrivance that already has
proper external speakers and better bass/treble controls. I usually
need to couple it through an isolation xformer to avoid hummmmm caused
by a ground loop.



TVs these days have Class D balanced drivers feeding the speakers with little filtering.

This makes it a PITA to get audio out if the set does not already have that feature.

I needed to use small audio transformers and low pass filters to get the switching freq down.

And after all that, there still was no bass, I had to find a hidden sub menu to change the audio mode to full range.

mark
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Old June 30th 19, 02:07 PM posted to sci.electronics.repair
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Default Bulging caps by design?

I prefer to use a hi-fi or entertainment contrivance that already has proper external speakers and better bass/treble controls.

Bass and treble ? I have a design that will blow your mind. If your public email is good I'll send you the print. Once I find it.

We are talking +/- 20dB, bass turnover continuously variable from about 40 to 400 Hz, treble has the same +/- 20dB with the turnover continuously variable from about 3KHz to 7KHz.

The only thing I am working on now is to decrease the effect of the treble when the turnover is lowered, meaning it boosts more frequencies. The reason is that if you got it set to 7K that 20dB boost is not that much, it is just bringing to you that sweet timbre. Take it to 4KHz and we are talking blowing tweeters fast like. So when I am done it is only going to have +/- 20 when set to the highest turnover.

Actually I am pretty sure I can just put some cutable jumpers on the board to allow the full range at all settings for those who get their tweeters wholesale...

It is a different approach to tone controls and I think I saw it implemented in some unit somewhere, but not as advanced as mine. No variable turnover..

I used to have the circuit values figured out but I lost it dammit. Doesn't matter I can figure it out again fast enough.

Actually if I get it up and send it you'll see because of the topology the values are very easy to figure.

Worse comes to worse I got it on paper and I can just scan it, where it was anyway, there is no Spice file of it.
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Old June 30th 19, 07:39 PM posted to sci.electronics.repair
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Default Bulging caps by design?

On Sun, 30 Jun 2019 06:07:08 -0700 (PDT), Jeff Urban
wrote:

I prefer to use a hi-fi or entertainment contrivance that already
has proper external speakers and better bass/treble controls.


Bass and treble ? I have a design that will blow your mind.
If your public email is good I'll send you the print. Once I find it.


My email in the signature works. However, please don't send me your
design. I'm not into audio (pro or prosumer) and really don't have
the time to look at it, analyze it with LTSpice, critique it, build
it, or test it. Good luck with your design.

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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Old July 6th 19, 09:50 PM posted to sci.electronics.repair
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Default Bulging caps by design?


On Sun, 30 Jun 2019 06:07:08 -0700 (PDT), Jeff Urban
wrote:

I prefer to use a hi-fi or entertainment contrivance that already
has proper external speakers and better bass/treble controls.


Bass and treble ? I have a design that will blow your mind.
If your public email is good I'll send you the print.


Are there graduate lab students or corporate scientists who’ve seen it and it’s results? Who are they and what are their findings?


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