JWIN DVD player horizontal control

Check video plugin to see if connect good on both tv and dvd player. You might try unplugging and re plug. If that doesn't help you might try another plug wire not sure if you have rca or HDMI plugs.

volume + on remote control

Static interference can cause that issue, check the cabling from any devices attached. (DVD players, sat/cable boxes, gaming systems)

I recomend that you clean the lens to see if that makes a difference.
Also you might want to look at my Tip on dealing with DVD's that jump.

Are you playing wide-screen movies on a 4x3=1.33:1 (standard=SD) TV? DVD output by default is SD. Even 16x9=1.78:1 (HD) movies with have top and bottom bars. Many "wide-screen" DVDs are squeezed horizontally so that you have to stretch them. Many theatrical releases are up to 2.7:1 or so. Side bars indicate you have the DVD output set for 4x3 and your TV is HD-like. There are usually controls for the screen format on HD TVs--no controls on SD TV. Hey, early movies were 1:1--take them side bars. More on aspect ratio (AR) in Wiki, I bet. With letterbox of SD you can get "pillar box" with black on all 4 side. Get a better source and/or choose a different AR. -Ken

i would like the code for this jd-vd141 dvd player

1- Open tray
2- Press setup
3- Press 1 3 8 9
4- Use Up/Down key from remote control to change the Region
5- Press setup

I have the Denon 2900 (about 4 years of use) and until recently, suffered from the same (growing) problem. CD's were very difficult to start/read. I recently found advice which I tried and was succesful with. It was manually cleaning the laserlens. I took away the outer housing by unscrewing all off the on top (6), side (4) and the back (2) bolts. After that I took out the top plate of the laserunit which took two very little screws taking out. Now you are looking at the cd-tray with the lens. Take a very soft and clean cloth and moisten it a little bit with clean water (be very carefull with the moistening, don't allow any waterdrop to come out of the cloth into the laserlens while cleaning! Carefully clean the lens and dry it with a dry part of the same cloth. Replace the top plate and the outer housing and the player will recognize the discs like it's new again. Good luck! Robert Jan, The Hague the Netherlands

Turn unit power on
with dvd draw closed and with no disc
press 9735
hidden menu appears
select REGION 0
exit setup
for multi zone compatibility and enjoy...

I had the same problem, don't try to hard it won't solve the problem. Just buy a new cheap one and it even will read more formats.