Badcaps.net Forum
Go Back   Badcaps Forums > Electronics Theory and Troubleshooting > Power Supply Design and Troubleshooting
Register FAQ Members List Social Groups Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 03-02-2009, 07:45 AM   #1
_polarix_
New Member
 
Join Date: Mar 2009
Posts: 5
Default Yuyang YP2632T: oil from cap ?

Hi all.
I have an LG LCD TV model 26LX2R.

When I have removed the power supply, i have noted some oil in back of the PCB.
I have alreay readed here that samxon caps have this problem after they bulg.

The question is that I cannot see any bulged cap.

Can you help me with some advise to find the bulged cap ?

Image of the board

Thank you
_polarix_ is offline   Reply With Quote
Old 03-02-2009, 09:03 AM   #2
linuxguru
Badcaps Veteran
 
Join Date: Apr 2005
Posts: 1,048
Default Re: Yuyang YP2632T: oil from cap ?

The cap right next to the Yuyang text is suspect, and caps can leak through the bottom seal as well.
linuxguru is offline   Reply With Quote
Old 03-03-2009, 01:53 AM   #3
_polarix_
New Member
 
Join Date: Mar 2009
Posts: 5
Default Re: Yuyang YP2632T: oil from cap ?

Thank you for you advice.
I have removed C133 cap but I can see no oil under it. It seems clean.

With a ohm tester it seems to charge before going in open-circut.
Is it possible to test its goodness ?
_polarix_ is offline   Reply With Quote
Old 03-03-2009, 03:59 AM   #4
shadow
Badcaps Veteran
 
Join Date: Feb 2007
City & State: Melbourne, Victoria
My Country: Australia
Posts: 725
Default Re: Yuyang YP2632T: oil from cap ?

To test a capacitor you will need at least an ESR meter.

Most failures in capacitors cause high ESR which leads onto critical components not functioning correctly.

It may also be useful to have a capacitance meter. This meter can be bought standalone or it can be part of a multimeter.

Some failures of capacitors cause the capacitance of the capacitor to drop below the tolerance for the component. This does not happen very often because capacitors (especially the electrolytic variety) have a large tolerance range and this is taken into account within the circuit. Capacitance type failures are usually uncommon (in comparison to ESR type failures).
shadow is offline   Reply With Quote
Old 03-03-2009, 06:12 AM   #5
_polarix_
New Member
 
Join Date: Mar 2009
Posts: 5
Default Re: Yuyang YP2632T: oil from cap ?

Ok.
I have removed some suspect caps and then put back them again (the same !).
I have replaced a Samxon 2200uF 10V (this seems to be a very problematic one) with a Daewoo equivalent one (I guess).

Than i put back PSU in the tv and now the lcd power on very well !!
But only one time !!
On the next times... the 5VSB-led turns off slowly when I press the ON/OFF butto on the lcd for some seconds.

May I be sure that the problem is some capacitor?

Thank you.
_polarix_ is offline   Reply With Quote
Old 04-23-2009, 03:16 AM   #6
_polarix_
New Member
 
Join Date: Mar 2009
Posts: 5
Default Re: Yuyang YP2632T: oil from cap ?

For all.
I have replaced every caps on the board.
Now, it works very well.
Thank you all.
[Solved]
_polarix_ is offline   Reply With Quote
Old 04-23-2009, 10:52 AM   #7
Wizard
Badcaps Veteran
 
Join Date: Mar 2008
Posts: 2,297
Default Re: Yuyang YP2632T: oil from cap ?

Are you using quality capacitors from our badcaps capacitor list not just blithely replacing it with another crappy capacitors?

Cheers, Wizard
Wizard is offline   Reply With Quote
Old 04-23-2009, 05:47 PM   #8
370forlife
Large Marge
 
370forlife's Avatar
 
Join Date: Aug 2008
City & State: Kalamazoo, MI
My Country: United States
Line Voltage: 0-120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 2,890
Send a message via AIM to 370forlife
Default Re: Yuyang YP2632T: oil from cap ?

He said he replaced those with daewoo's, so I'm guessing he will have the same problem soon enough.
__________________


Quote:
Originally Posted by JFK
The American, by nature, is optimistic. He is experimental, an inventor and a builder who builds best when called upon to build greatly
370forlife is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 03:52 PM.


Badcaps.net Technical Forums 2003 - 2014
Powered by vBulletin ®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

Did you find this forum helpful?