Question about Samsung LN-S4051D 40 in. LCD Television
Replaced power and main board still wont turn on
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Posted on Jan 02, 2017
You need to do some more diagnosing of the problem. If you get sound and change channels take a bright flashlight and place it again the screen. Look for an image around the edge of the flashlight.
If you see an image that means the LCD controller board (TCON) is probably good.
The problem is probably one of three causes;
1) Inverter board is bad
2) CCFT (cold cathode fluorescent light) are bad.
3) Power to the inverter board is bad. You can also check the connectors.
Posted on Mar 30, 2009
To solve this type of problem, you need a piece of white chalk. Draw a line around the area where the set is at. Call a priest - and lay the poor thing to rest!!!! This isn't the first time Samsung has "dropped" junk onto its' customers. Their dvd players also had problems with their DSP I.C.s that would over heat and cause the video playbacks to "break up". Don't waste any more time or money on the product!!!!!
Posted on May 18, 2010
The power board is the usual culprit but I have also seen the main board, T/Con board or the panel itself cause this problem. I would recomend calling a trained tech to figure out the problem. You could spend hundreds of dollars on parts and still not fix it. You can call 1-800-samsung to find nearest service center.
Posted on May 21, 2010
you will need to check weather the 24vdc supply for the inverter board is good no drop voltage. if no supply check the power supply board. then you should check if their is a inv_on signal at the power inverter board around 3v-4.4vdc . if goes out during power on tried to disconnect the supply going to the inverter board to ensure if their is a shorted parts in the inverter board. if the inverter_on signal also goes out even with out inverter board connected that was mean you have problem in the processor board.
Posted on Nov 02, 2012
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