30 Jun '12, 12am

Some Flyback converter expertise?: I did find an open fuse on the motherboard, caused by a shorted upper MOSFET

Some Flyback converter expertise?: I did find an open fuse on the motherboard, caused by a shorted upper MOSFET

Bouyed by success in reviving an LCD monitor last year, I now find myself having spent $80 on an LCD TV with little hope of recovery. I'd like to learn a bit about a subject I believe is at the heart of the problem; off-line flyback converters. I would be very happy if any EETimes reader with flyback converter design expertise could offer some hints on what may be happening here. The set, a 5 year old Dell w2607C LCD that I received for free, exhibited the amber flashing LED symptom commonly complained about on various websites. After finding the full service manual with schematics on the web along with availability of third-party capacitor replacment kits for the PSU board, I figured the set could be restored with little more than $10 and a couple hours work. I did find an open fuse on the motherboard, caused by a shorted upper MOSFET in a local 1.2V DC converter. Althoug...

Full article: http://www.eetimes.com/message-board/other/4376499/Some-F...

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