philips VCR smps HELP!!!

morpheus82 · 8th November 2006, 06:03 AM

hi all!
i've got some problems with a VCR...
when i connect it to the mains, it won't power up, but i can ear a sound from SMPS like bzzz...bzzz...bzzz...periodic with about 1 second period...everything looks ok...apart from the 56uF capacitor near the TDA(don't remember full code...) switching regulator that seems to have not so much life, but maybe it's just appearance...
anyone who got this problem?
any help is welcome!!!

wrenchone · 8th November 2006, 06:35 AM

I had a problem similar to his with my JVC VCR. It was fixed by replacing the output caps in the SMPS. They dry out, especially if the VCR is lefit in standby, as the power supply does not really shut down then. Newer supplies may be different, and actually go into some kind of power saving mode.

morpheus82 · 8th November 2006, 06:54 AM

many thanx!i've read right now in the web that the capacitor i told before sometimes causes this problem, but i will change output capacitors too to be sure!otherwise there are 5 or 6 different capacitors, 470uF each if i remember well...do i have to change all?

wrenchone · 8th November 2006, 06:57 AM

All the ones on the output side - how would you test them, anyway? Switcher-quality electrolytics are cheap these days.

8th November 2006, 06:03 AM	#1
morpheus82 diyAudio Member Join Date: Oct 2004	philips VCR smps HELP!!! hi all! i've got some problems with a VCR... when i connect it to the mains, it won't power up, but i can ear a sound from SMPS like bzzz...bzzz...bzzz...periodic with about 1 second period...everything looks ok...apart from the 56uF capacitor near the TDA(don't remember full code...) switching regulator that seems to have not so much life, but maybe it's just appearance... anyone who got this problem? any help is welcome!!!

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8th November 2006, 06:35 AM	#2
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	I had a problem similar to his with my JVC VCR. It was fixed by replacing the output caps in the SMPS. They dry out, especially if the VCR is lefit in standby, as the power supply does not really shut down then. Newer supplies may be different, and actually go into some kind of power saving mode.

8th November 2006, 06:54 AM	#3
morpheus82 diyAudio Member Join Date: Oct 2004	many thanx!i've read right now in the web that the capacitor i told before sometimes causes this problem, but i will change output capacitors too to be sure!otherwise there are 5 or 6 different capacitors, 470uF each if i remember well...do i have to change all?

8th November 2006, 06:57 AM	#4
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	All the ones on the output side - how would you test them, anyway? Switcher-quality electrolytics are cheap these days.

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