SMPS Fault

Tripmaster · 23rd October 2009, 09:05 AM

Hi

Please excuse this non-audio related question.

I have just replaced a potentiality faulty reservoir cap in an LCD display. I hooked up a light bulb tester and the bulb glows brightly, and flickers in time with the switching power supply.

I didn't use the bulb tester before changing the cap so I am unsure if the bulb would have flashed in the same way.

EDAC EP2200

Any help will be appreciated?

Thanks

Richard

Hurtig · 23rd October 2009, 09:26 AM

Be carefull!! SMPS is not for dummies

Not that I say that you are...

They often involve quite large high voltage capacitors, that will tickle quite hard....

Hurtig · 23rd October 2009, 09:27 AM

Be carefull!! SMPS is not for dummies

Not that I say that you are...

They often involve quite large high voltage capacitors, that will tickle quite hard....

Tripmaster · 23rd October 2009, 09:30 AM

Quote:

Originally Posted by Hurtig

Be carefull!! SMPS is not for dummies

hard....

You are not too far from the truth

Yes it's a 150uf 450v cap!

Tripmaster · 27th November 2009, 02:20 PM

Hi there

It turned out to be the inverter.

Thanks for your help!

luka · 27th November 2009, 05:45 PM

cool!

Tripmaster · 21st October 2011, 03:57 PM

Wow, almost two years to the day of my last post my second display panel has failed. I swapped out a few of the components from the original monitor to locate the faulty part, and this time its the smps. An identical supply is pictured in the first post.

I noticed a pulsating whine when trying to power up the screen, and think it was coming from the smps. I tried cycling the power quickly a couple of times and the screen would display briefly. When the screen first failed it blew a fuse, this was replaced and it didn't happen again.

Any suggestions?

Thanks

Richard

Th3 uN1Qu3 · 22nd October 2011, 01:18 PM

Some pics of the power supply and part numbers on the ICs, mosfets and diodes please. I assume you do have a multimeter. Use a 100W bulb in series with this supply, that looks like a big monitor.

23rd October 2009, 09:05 AM	#1
Tripmaster diyAudio Member Join Date: Feb 2008 Location: UK	SMPS Fault Hi Please excuse this non-audio related question. I have just replaced a potentiality faulty reservoir cap in an LCD display. I hooked up a light bulb tester and the bulb glows brightly, and flickers in time with the switching power supply. I didn't use the bulb tester before changing the cap so I am unsure if the bulb would have flashed in the same way. EDAC EP2200 Any help will be appreciated? Thanks Richard

27th November 2009, 02:20 PM	#5
Tripmaster diyAudio Member Join Date: Feb 2008 Location: UK	Hi there It turned out to be the inverter. Thanks for your help! __________________ Richard My photostream: http://www.flickr.com/photos/59839778@N04/

21st October 2011, 03:57 PM	#7
Tripmaster diyAudio Member Join Date: Feb 2008 Location: UK	Wow, almost two years to the day of my last post my second display panel has failed. I swapped out a few of the components from the original monitor to locate the faulty part, and this time its the smps. An identical supply is pictured in the first post. I noticed a pulsating whine when trying to power up the screen, and think it was coming from the smps. I tried cycling the power quickly a couple of times and the screen would display briefly. When the screen first failed it blew a fuse, this was replaced and it didn't happen again. Any suggestions? Thanks Richard __________________ Richard My photostream: http://www.flickr.com/photos/59839778@N04/

22nd October 2011, 01:18 PM	#8
Th3 uN1Qu3 diyAudio Member Join Date: Feb 2010 Location: Bucharest	Some pics of the power supply and part numbers on the ICs, mosfets and diodes please. I assume you do have a multimeter. Use a 100W bulb in series with this supply, that looks like a big monitor. __________________ "Audio grade" components simply means that they failed at a more critical job.

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23rd October 2009, 09:26 AM	#2
Hurtig diyAudio Member Join Date: Feb 2005 Location: Denmark - Århus	Be carefull!! SMPS is not for dummies Not that I say that you are... They often involve quite large high voltage capacitors, that will tickle quite hard....

23rd October 2009, 09:27 AM	#3
Hurtig diyAudio Member Join Date: Feb 2005 Location: Denmark - Århus	Be carefull!! SMPS is not for dummies Not that I say that you are... They often involve quite large high voltage capacitors, that will tickle quite hard....

27th November 2009, 05:45 PM	#6
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	cool!

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