Hguys;i have here a Samsung Plasma Tv PN50A550 Power supply that has a blown main fuse and a huge black spot around the 2 moves resistors ,here some pics,before anything of do you guys think of it,this tv belongs to my friend and i advised him to bring the power supply only because tv is so heavy and since it was completely dead,i assumed it was the power supply issue,any thoughts thanks?
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Re: Sumsung Plasma Tv PN50A550 dead
Originally posted by Dumah Brazorf View PostIt's dust or sawdust?
Traces seems big in that area so I think you can repair the damaged ones easily.
Those resistor are inrush limiting current ones so probably there's a short after them. Check the main bridge rectifier.
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Re: Sumsung Plasma Tv PN50A550 dead
Check for short after the bridge rectifier, expecially mosfets.Last edited by Dumah Brazorf; 02-05-2018, 04:29 PM.
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Re: Sumsung Plasma Tv PN50A550 dead
Originally posted by Dumah Brazorf View PostCheck for short after the bridge rectifier, expecially mosfets.
do you know if this sumsung kit has those components included ? 20N60C3
http://www.shopjimmy.com/samsung-bn4...repair-kit.htmLast edited by ivtec; 02-05-2018, 06:37 PM.
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Re: Sumsung Plasma Tv PN50A550 dead
Its a very good chance that the contacts are bad in RLYE801 relay. The relay should short out the thermistors when the tv is running, if the contacts are bad all the current is drawn through the thermistors and they burn up.
If you don't find any shorted parts elseware, replace the mov's and the relay and it should work
I think they are SCK-801's
With the thermistors open you won't get any standby voltage if I remember
Also check FB801 fuse, if its good I suspect the standby circuit is o.k.Last edited by R_J; 02-05-2018, 07:55 PM.
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Re: Sumsung Plasma Tv PN50A550 dead
Originally posted by R_J View PostIts a very good chance that the contacts are bad in RLYE801 relay. The relay should short out the thermistors when the tv is running, if the contacts are bad all the current is drawn through the thermistors and they burn up.
If you don't find any shorted parts elseware, replace the mov's and the relay and it should work
I think they are SCK-801's
With the thermistors open you won't get any standby voltage if I remember
Also check FB801 fuse, if its good I suspect the standby circuit is o.k.
2 Sck 0512 inrush resistors, also i checked ordering these parts from different sources will cost about 40 bucks including shipment and not sure thing cause it maybe something else bad, i checked this power supply the cheapest i could find about 45 bucks,don't know ! what do you think?
http://www.buyqual.com/samsung-bn44-...8aAsolEALw_wcBLast edited by ivtec; 02-06-2018, 07:25 AM.
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Re: Sumsung Plasma Tv PN50A550 dead
If it is "FB 801" that is open, then UB801 standby ic likely bad, shorted. FE 801 is the main fuse off the a/c line. I don't where the 2 mosfets you mentioned are on the board, I don't have this schematic, I'm going by SJ pictures of the board. $45.00 is not a bad price, if you add up the parts you need to repair this one it mmight be cheaper to just replace it.
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Re: Sumsung Plasma Tv PN50A550 dead
Main fets short on these vtec kicked in yetPlease 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 !
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