If there is power to the supply board, it most likely needs a main board. Check ebay for the board and you tube for a video of how to replace it.
SOURCE: Samsung LN-S4051d power supply board
The replacement of the power supply is quite easy. You will have to remove the base if applicable and the back cover, once you remove it; you should see the power supply.
Click here to see how the power supply looks like and availability or Click here to find a cheaper one.
I can also repair your power supply. If you need further assistance you can write to [email protected]
SOURCE: I'm working on a sanyo 50" hdtv, It wont power on,
The power supply board have 6 capacitors dead,must have very high current going through the tv to have that many cap to died on the power supply board.U have good electronic skills trouble shoot the power supply board again,have something else is dead in there?Or try website like Ebay.com to buy a refurbish power supply board for the replacement.
SOURCE: no picture no sound just
no if the tv turns on with the remote or power switch that means you have the 5 volt standby for the main board there could be two other reason why you dont have a picture or sound the y-sustain board buffers or logic board you will need a tech to see which on of these boards are out 9 out of 10 its usually the y-sustain board with the vizio
SOURCE: Sanyo DP50747 Replaced Power Supply still not working
this issue is related to either the y sustainer and z sustainer boards, checking the fuses on the y/b will giving you a good indication, if they are open(bad) then you'll have a easy fix, if not, i would try replacing the y board first.
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