Question about Televison & Video
This problem is not consistent happening some other day have power but some other day no pwer.
It is likely to be a failing capacitor on the power supply board. If you do open it up, check for any bulging capacitors (small round metal cans with a plastic label.) or any that may be oozing material out the top or bottom. Those that show such stress should be replaced with High Ripple Current types of the same working voltage or slightly higher.
Posted on Oct 30, 2012
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Posted on Jan 02, 2017
SOURCE: Protron PLTV-3250 fried
A possible solution would be to obtain a schematic for the power supply. If we're technicians, this should work out for most of us.
Keyword on schematics....OBTAIN! John
Posted on Jul 24, 2008
The problem is the mainboard tried to turn on TV but failed due to internal circuit problem. Normally, the power supply board is malfuntioned.
Posted on Aug 13, 2009
I have this part for sale!! If you haven't found a solution, let me know. The only problem, is i'm in France. Depends how bad you need it i guess!
Ps it's a new item
Posted on Nov 30, 2009
I have the same television and the power supply was bad, I had no lights on the front at all so I tried replacing the capacitors on the power supply thinking that would fix it. That did not fix it and I was told that not only do the capacitors go bad but sometimes something else on the power supply board goes bad and is very hard to diagnose without the proper training, so i bought a new power supply board. I put the power supply in and I then had all the lights on the front but the red led light on the power supply was blinking and the lcd would just show the polaroid picture on the screen and would try to light the back lighting but would immediately turn off.
I took a blow dryer and slightly warmed up the 5 blue capacitors that are on the main processor board "not the power supply board". 3 of these capacitors are 470uf @ 50 volts and the other 2 capacitors are 470uf @ 25 volts. It appeared that once the warmth did it's trick, it took a few minutes after warming them, the Tv now turns on. I am going to get these five new capacitors and change them on my main processor board (not the power supply board). I am guessing that either one of these capacitors or maybe all 5 are starting to malfunction, 2 of these capacitors do appear to have a slight bulge and crease on the silver top.
Watch your screen from behind the tv when turning it on, if you see the backlight turn on for about 2 seconds when the polaroid screen appears and then turn off you may very well have the same 1-5 capacitors malfunctioning on your main processor board. With that said if you feel that the power supply board is functioning as it should be and it sounds like it is then if you do not feel comfortable changing these five blue capacitors on the main board then you could always try replacing the main processor board with a new one. I believe that www.discount-merchant.com or www.shopjimmy.com has this board. Just get the part number directly from your old board and look that number up on their website. It is heart breaking almost using process of elimination when you have to spend money buying boards to accomplish this but I can tell you this, "electronics repair just for checking it out = $100 or more and then the price of the boards so you will reach well over $200 i would think" replacing the power supply cost me $78.00 and even if i have to replace my main processor board that will cost about $60.00 so I am still only at about $138.00, a new LCD tv of this size would cost about 350.00 or more. Now this information is only good considering that you feel comfortable enough changing the circuit boards yourself, be very careful of what you touch and try to touch only the outer edges of the boards.
Posted on Dec 08, 2009
You'll find some Samsung power supply boards here : http://www.usefulparts.com/index.php?main_page=index&manufacturers_id=11&sort=20a&filter_id=98&alpha_filter_id=0
but you have to open your TV first and find out model number
Posted on May 10, 2010
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