I change my tv main board & the other boards and now it only light up nothing else work, its a Samsung 55 curve model # UN55JU6700FXZA. Any idea what is the problem? and how to fix it?

SOURCE: how hard it is to replace by yourself main board Samsung LN-T4065

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.

SOURCE: On Samsung main board model bn94-01708u with no video.

Hi, I think you need to replace the video card.
Thanks! mannu_rakesh

SOURCE: Samsung HD 42inch TV Model No. PS42S5H Y Board

Your board numbers should start with LJ92. They will cross to both Samsung and LG. Oh, your model number goes nowhere, double check it.

SOURCE: I have philips plasma tv model #42PF9630A with ambient light

last time I had seen these syptoms on Philips plasma it was bad panel. Replace tv panel is too expensive to replace.

SOURCE: my model tv is Samsung model LNS4692DX/XAA

Hello: The problem is on the power supply, there are two capacitors on the power supply near the plug that goes to the mainboard, these caps will look swollen at the top on them compared to the other capacitors in the circuit, if you know how to unsolder and resolder parts then this is a simple fix. The value of the capacitors on the board are 1000uf rated at 10 Volts, replace them with 1000uf rated at 16 Volts instead so this will not happen again. You can find them at any local electronics parts store, (Radio Shack) for instance..There will be two of them that look puffy at the top,they should all be flat so spotting them should be very easy...
Thks: Have a Happy Holiday...