Samsung UN46D7000 tv still isn't turning on. I've already replaced the power board (I think the original was fried in a power surge).There's no standby light either.

1. Make sure the back lights are OK, to do so, unplug the cable between the power supply & the main board, apply the AC power to the power supply, if the back lights are OK, it should light up.
2. If the back lights are OK, i will try a new main board first.

my experience with this unit is that it is highly susceptible to surges. I have replaced the same input board on one set twice. Samsung does not Support this unit very well. Parts are available but very difficult to find someone who will sell them to you. I suggest a repair shop or replace the set.

Power surges can do major damage to multiple boards, it is possible you have other faulty boards. You will need a multimeter at the very least to be sure.

There is a chance the power supply is fried. However, I've seen some Samsung power supplies that have fusible resistors in the power supply for added protection. So your main fuse could be ok, but there could be an additional fusible resistor in the board as well. Also be aware, depending on where the surge entered the TV, you could also have a defective main board. Not trying to rain on your parade, but surge damage can sometimes be severe.

If the power indicator doesnt come on at all then chances are its the power board if the standby supplies are not present.

I have this exact same model "UN46D7000LFXZA" with the exact same problem and I also replaced the power board expecting that since that is where the clicking was coming from that would fix it even though there were no swollen capaciters. However, it didn't and the board is from a working pull so I knew that was not the issue. What I did is I unhooked the main board connection from the power board and turned it on to test a hunch, and instantly the LEDs powered on and no more clicking. I just received a main board in the mail switched it out a few minutes ago to confirm it was indeed a main board problem. I got mine for $114.99 on eBay after confirming that the part numbers that were slightly different were interchangable. I lost all of the firmware upgrades changing out the main board obviously but downloading and installing those is a small price to pay for finally having a working 3D TV back for less than the cost of the extended warranty.
I would suggest carefully trying the same thing and disconnecting your main board and make sure your LEDs light up. I bet they will. I was just guessing at the main board but since there are only two boards left after the power board was replaced and the other board should have no affect on the power board to my knowledge I think this will fix your issue too.

Few mins will not resetting tv and recovering power supply board from it protection modes that quick.Tries tv unplug,replug it back like about an hour later for tv resetting it back to the factory setting.The tv should get out it protections modes and might work again.If tv still have the same problems,than enough high currents got in the tv and kill ur tv power supply board.That the board where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish power supply board for the replacement.

Hello,

yes, it could be a power surge,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.

All these can be checked on the power supply board.

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Regards.

Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Good luck.

you may need to replace the powerboard in the unit. it sounds like it might have fried already or is on the verge of it.