DP47840 will not power up

1. open the back cover of the TV, disconnect the cable between the main board & the power supply.
2. Apply the AC power to the power module, if the back lights are not light up, change the LED strips (IF the back lights are bad, in some case, the power supply also been damaged), If the back lights are light up, please change the main board.

Yes,this problem are related to the main Tuner signal board,must change the main Tuner signal board,to solved this problem.Put back your old power supply board too might be still good,but some time the power supply board must have to be replace too,becaused it got corrupted by the data from the main CPU from the main Tuner signal board.

hi, i take it you've checked the fuse in the plug, there's usually a glass fuse inside the washer power supply not sure where the circuit board is located in your machine but they usually sit at the bottom of the machine if it has blown make sure you put the same rated fuse back in. if blows again the there's a dead short somewhere hope it helps

regards
shaun

This set is a 50" plasma. first check the AC power fuse on the filter board then: if it is bad: check the power supply by marking and, removing all the cables; (so you can put them back in the correct spot) except the filter board to power supply cable; that connects to the Power supply board. Then: replace the blown AC fuse and, re-power: If the power supply blows the fuse: again, the power supply is bad and, must be replaced or, repaired. If the fuse does not blow: turn off the set then: on again, reconnecting and, disconnecting each board cable in turn, untill the fuse blows again this cable leads to the bad board; replace or, repair the board that blows the AC fuse every time the bad board is connected, irregardless of which other cable to the power supply may be connected also; or, not.

in the printer there is a power supply board.there is a same type of 3amp fuse on the power supply board.if there is any kind of overheating in the power then the fuse in the plug and fuse on the power supply board blows out.in some cases only fuse on power supply board blows out.this fuse is placed on the board for safety reasons.because in the older model printers when this short circuit problem was happening at that time whole board used to blow out.so in the new model of printer a fuse is placed on the board ,so if any overheating or any power outage or any short circuit occurs.the fuse blows out instead of whole power supply board. You just need to replace the fuse on the power supply board by disassembling the printer.the power supply board is the green color square shaped board.its the board to which your power wire of printer is connected. the fuse is available at any local electric hardware shop.its not any special kind of fuse. This will help. Thanks please keep updated. please please do rate the solution positively .thank you for using fixya

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.

if you feel the power supply is good then the next item would be the main pcb. if the back light is coming on with no video then the t-con board is bad but power supply seems to be most common for me.

maybe its the power supply failing

change the power plug and try again if not working then change the power supply.

Blows AC fuse on plug-in is a direct short in power supply...
check components with ohmmeter to find short....Check MOV
across AC line by measuring across AC fuse clip.......T.