I have 3 decices. Mitubishi tv, rca soundbar, and lg smart blue ray. I purchased the soundbar as only 1 speaker works on tv

[Melondy]

Help connecting lg blueray, mitsubisi tv, cable box and rca soundbar

 

[americanaudiophile]

Without model numbers no way to be exact. In general connect the bluray to the TV with HDMI. Depending on what kind of audio output the TV has and the inputs the soundbar has you might need a DAC like this one
http/www.parts-express.com/parts-express-dac-digital-to-analog-converter-%2851-compatible%29--180-999
If the TV has analog audio outputs you would need a stereo audio cable with the right connectors on the ends.