Each DVD player has 2 service menus, a testing menu where you can run tests to see if all is operating correctly. Then there is the one that you can make ajustments. I am deliberatly hiding that one from you, you don't know enough about the geometrical balance of colors alone and would ruin your player.
I did this once in my Sony changer and got 2 discs stuck in the center and had to destroy one to get them both out, I know better now. If you can't even afford a receiver how are you going to *feel* if I give you the knowledge and you mess this player up so much, that you destroy the player?
I am not bragging to you but I have over $53,000 into my Home Theater! I own 1,132 Region 1 discs at $25 each plus shipping, just taking 1,000 times $25= $25,000 + shipping for plastic. I am the one that can order a **** load of speakers, a receiver and Dolby Decoder and think nothing of it.
I prefer to listen with Sennheiser 5 sounds from low impedance headphones, I use Denon top of the line AHD-750 with 30 Ohm impedance headphones that go for $175 plus shipping. I don't have a receiver by choice. If you can't even afford a stereo, don't play around trying top get you DVD-A to DVD video or you won't have a nice christmas at all!