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Old 11-24-2009, 02:56 AM   #1
davmax
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Default LG L1717 Monitor cap failure

I had a L1717 come in for repair. It is not an easy monitorto open up. First two screws must removed from what appears to be the stand mounting. These screws actually retain the front bezel, once removed the bezel can be prised off by first levering on the stand and lifting the back cover away from the bezel. The bezel can then be removed to gain access.

The cap problem. The power supply main filter cap 680uF 25V was blown apart. It was a a low grade (low ripple rating) Samxon. The rest of the Samxons gave no indication of stress. Apparently the main cap was not able to sustain the ripple long term (3-4 years). It was replaced with a Rubycon ZL that has great ripple ratings and all works fine.
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Old 12-12-2009, 12:18 AM   #2
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Default Re: LG L1717 Monitor cap failure

Hi i have this exact same monitor, same problem.
Would it be possible, or not advisable to replace the capacitor with a 1000uf 25v?
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Old 12-12-2009, 12:54 AM   #3
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Default Re: LG L1717 Monitor cap failure

Quote:
Originally Posted by rkelly
Hi i have this exact same monitor, same problem.
Would it be possible, or not advisable to replace the capacitor with a 1000uf 25v?
Not advisable for sure, get one that as +/- 50 uf or closer.
i dont usually post but that jumped out at me.
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Old 12-12-2009, 01:19 AM   #4
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Default Re: LG L1717 Monitor cap failure

Thanks, i'll wait till my next order and get an appropriate cap for this screen.
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Old 12-12-2009, 06:36 AM   #5
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Default Re: LG L1717 Monitor cap failure

Quote:
Originally Posted by rkelly
Hi i have this exact same monitor, same problem.
Would it be possible, or not advisable to replace the capacitor with a 1000uf 25v?
if its a proper low esr type go ahead.i often use panasonic fm in 1000/25 as that 680 is an oddball.
only problem with this sub is size.check clearances.
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Old 12-12-2009, 11:05 PM   #6
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Default Re: LG L1717 Monitor cap failure

I put the 1000uf in and its working just fine. Its a Hitano EXR series which i use for all my recapping, never had an issue with them, but allways use the same voltage / uf rating of the old cap. Thanks for the replies.
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Old 12-13-2009, 12:17 AM   #7
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Default Re: LG L1717 Monitor cap failure

why that brand?

that brand sounds bad to me.

i'd use:

samxon
rubycon
panasonic
nichicon
chemicon
sanyo

try not to cut corners... its bad when the square factory turns out circles.
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Old 12-13-2009, 12:31 AM   #8
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Default Re: LG L1717 Monitor cap failure

Its easy for me to get those capacitors. I get them from a wholesaler here in Australia called "WES components". I don't buy enough to get an account with bigger suppliers who might get different brands.

But I have not had any trouble with them yet, so i guess they are alot better than the ones i'm replacing.

The one that failed in this particular monitor was a Samxon, so i'd rather not use any of those.
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Old 12-13-2009, 02:02 AM   #9
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Default Re: LG L1717 Monitor cap failure

Samxon are usually fine, except for GF series.
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Old 12-13-2009, 02:21 AM   #10
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Default Re: LG L1717 Monitor cap failure

Quote:
Originally Posted by c_hegge
Samxon are usually fine, except for GF series.

Yes it was a GF. I don't recap professionally (for customers), moreso as a hobby, saving things that are destined for the garbage, so if the Hitano's give up over time, i'll just recap them again.
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Old 12-14-2009, 10:00 PM   #11
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Default Re: LG L1717 Monitor cap failure

Hitano is decent, IIRC.
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Old 10-03-2010, 03:26 PM   #12
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Default Re: LG L1717 Monitor cap failure

ive had one of these (LG 1717S) for a while and couldnt figure out the problem.....unit would intermittantly not turn on...power supply would come up, but the power switch would not do anything.....

except occasionally....it would fall into a "groove" and work for a while....sometimes after playin with it...couldnt tell if I was actually doin anything....

I used an esr meter to find the worst caps, none of which were really horrible, and it turned out that a small cap on the line side of the switching supply was causing the pblm....not a really bad cap, not bulged...not exceptionally high in esr, cant really figure it...a small electrolytic 33uf at 50V....i put in a 47uf at 25V and measured the voltage at the cap...never went over 12V so ill leave it for a while and see what happens....

ive never seen anything on the line side of a switcher cause a problem like this....if theres a problem on that side, the whole power supply is usually out...and the unit was puttin out the 12 and 5...crazy.
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Old 01-16-2011, 09:25 PM   #13
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Default Re: LG L1717 Monitor cap failure

what other capacitor can i use if i can not find the 680uf 25v 105 on this site?
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Old 01-16-2011, 10:40 PM   #14
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Default Re: LG L1717 Monitor cap failure

Quote:
Originally Posted by cloudyminded View Post
what other capacitor can i use if i can not find the 680uf 25v 105 on this site?
If the dimensions are okay, check out this one at badcaps.net

Samxon 680uF 35v 10x20mm GT Series

http://www.badcaps.net/store/product...roducts_id=111
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Old 02-03-2011, 01:12 AM   #15
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Default Re: LG L1717 Monitor cap failure

Just replaced a bad(leaking) SAMXON GF 680uF 25v on a power supply for an LG monitor. (this should be a nice solid replacement http://search.digikey.com/scripts/Dk...name=P12390-ND)

Fwiw, I get my caps from DigiKey.com (if I can't find them on badcaps.net... ;-)

So far I've had great success with Panasonic FMs.

Happy capping!

AIP0157 LCD Power Board For L1719S,L1719C or L1919S

Last edited by thegeeknme; 02-03-2011 at 01:39 AM.. Reason: added power board model and applicable monitor models
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Old 02-03-2011, 06:40 AM   #16
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Default Re: LG L1717 Monitor cap failure

bad idea to replace only the leaking one.
Samxon GF are replace on sight. all of them.
they die like flies for some reason.. unlike other samxon series..

also, LG apparently likes to use these as i've seen them in about 2 dozen of LG LCD monitors.. (17-22")
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Old 01-08-2014, 04:13 AM   #17
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Default Re: LG L1717 Monitor cap failure

Quote:
Originally Posted by kena999 View Post
ive had one of these (LG 1717S) for a while and couldnt figure out the problem.....unit would intermittantly not turn on...power supply would come up, but the power switch would not do anything.....

except occasionally....it would fall into a "groove" and work for a while....sometimes after playin with it...couldnt tell if I was actually doin anything....

I used an esr meter to find the worst caps, none of which were really horrible, and it turned out that a small cap on the line side of the switching supply was causing the pblm....not a really bad cap, not bulged...not exceptionally high in esr, cant really figure it...a small electrolytic 33uf at 50V....i put in a 47uf at 25V and measured the voltage at the cap...never went over 12V so ill leave it for a while and see what happens....

ive never seen anything on the line side of a switcher cause a problem like this....if theres a problem on that side, the whole power supply is usually out...and the unit was puttin out the 12 and 5...crazy.

Hi there, i also have a 1717s which is dead. when i plug it in, the green led shows up for a fraction of second, then dies. I read what you guys did on this forum and i managed to diassembly the thingie. Now thing is, im looking on the power supply and 2 components are foamy. one says c102 and the other is a th101 i guess. I am new in this and have no skills, i would like to know what would the replacements be, and where would i buy them in romania. I can solder, i did it before. Thank you, i feel like im blind and trying to put a nail into a wall. (i guess its kinda like that).
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Old 01-08-2014, 04:19 AM   #18
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Default Re: LG L1717 Monitor cap failure

Can you post pictures of your boards - a close up of C102 so we can establish what "foamy" means.
Do you have a multimeter
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Old 01-08-2014, 04:38 AM   #19
abstractcult
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Default Re: LG L1717 Monitor cap failure

Quote:
Originally Posted by selldoor View Post
Can you post pictures of your boards - a close up of C102 so we can establish what "foamy" means.
Do you have a multimeter
Sadly no, i do not have a multimeter, i just moved in a new rent place. Also by foamy i mean leaked i guess. I did manage to take pics of the board, the c102 and another leaked one which says th101. i also took a pic of the whole board. im attaching them. Thx for your reply !
Attached Images
File Type: jpg whoe board.jpg (1.25 MB, 46 views)
File Type: jpg th101.jpg (1.07 MB, 33 views)
File Type: jpg c102.jpg (1.19 MB, 29 views)
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Old 01-08-2014, 04:54 AM   #20
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Default Re: LG L1717 Monitor cap failure

There is good news and bad news.

Good news is "foamy" means nothing it is just glue to hold the parts in place.

Bad news is there are very very few tests we can do without a multimeter.
Cant actually think of any except testing fuses with a battery and bulb.

and secondly I have to go out now so cant even talk you through that.

Meter will be essential - in uk I can get a cheap one for 3 and they are
similar in US.
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