[TechAssist] need help w/DVD Player SMPS
- From: "Stefaan Van Slycken" <vanslycken@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 19 Aug 2003 22:13:57 +0200
Hi.
I drew up the SMPS schematic from a Terratec DVD player, but I've found these
"stand-alone" SMPS in more than one cheap DVD player (mostly these have a
"computer-like" DVD player unit, one with a standard SCSI cable and the typical
PC power supply cable).
You can find this schematic at
http://users.pandora.be/vanslycken/dvdvoeding.bmp - it's about 200k. I hope
it's a bit legible.
THE PROBLEM WITH THIS UNIT is that it tries to start over and over again, a
couple of caps on the secondary were blewn and there was a bad contact on a
diode on the primary side (indicated with a (*) on the schematic). I suspect
the problem is on the primary, I've tried taking out the +5V line diode, and it
still does the same. It's in some kind of "burst mode", tries to start up with
1 second intervals.
The +310V on the primary side capacitor is good too, and I measured every diode
for shorts or opens, but they all seem OK. I'm out of ideas...
I haven't been working on this kind of stuff without a service manual very
long, so I'd appreciate any help.
kind regards,
Stefaan Van Slycken
Van Slycken Elektro - Waasmunster, Belgium.
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