Philips plasma keeps blowing VS FETs (Samsung ps-424-ph PSU)
Good day folks. I've recently fixed a 42 inch Philips plasma display (or so I thought) which had 2 shorted FETs that drive the Vs. Trouble is the repair only lasted a few days: now the same FETs are dead-shorted again (along with the fuse, of course). The power board is a Samsung ps-424-ph (I can provide photos if need be), but what could be overloading the Vs bus to cause such behaviour in the first place ? The X/Y boards have their fuses intact. Does this happen when PDPs get old and begin drawing more power ? The FETs are FQA24n60.
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Wattevah... -
Re: Philips plasma keeps blowing VS FETs (Samsung ps-424-ph PSU)
Did you replace the driver for the transistors and related capacitors for it ? have serviced a few of them supplies one with shorted pfc fets. I replaced all surrounding capacitors (smaller ones) and the driver for it the caps go high esr causing a noisy input to the controller and it will see a lower in put in general which can throw the controller off and cause it to throw a wobbly killing the fets.
My advise replace the controller and smaller capacitors in that area.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/ -
Re: Philips plasma keeps blowing VS FETs (Samsung ps-424-ph PSU)
Thanks for the info, though those are not the PFC FETs - they're the Vs FETs...anyway, same concept, I got the gist. The controller is on a small riser board, but I don't think it's worth the headache at this point - already wasted too much money on this thing, so I'll just give it back to the guy and that's that - end of story.... The caps on the other hand could be bad, since I haven't replaced any. Makes sense, since they're at the top of the cabinet where all the hear rises...tough with no ESR meter :|Wattevah...Comment
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Re: Philips plasma keeps blowing VS FETs (Samsung ps-424-ph PSU)
Here's the PSU in question - rings any bells ? The FETs are on the heatsink right next to the green transformer at the middle-top. The controller is the riser to the right of that. I'm guessing the cap I should've replaced is that small one next to the riser. There's also a solid polymer one on the riser itself...Attached FilesWattevah...Comment
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