china made DVD player

[nido]

Hello!
Is there anybody from you who come across with the problem of this china made DVD player?
It can play perfectlly on VCD format disk but can not play on DVD format disk, everytime you insert a DVD format disk, it marked on LCD no disk, which is supposed to be a DVD a player. Before it's good you can play anything on this player from CD format, VCD to DVD, but after a month of used this problem came-up. Definitelly not the lens problem,I already try to swap it.
Is there any idea who can help?
Thanks in advanced.

[Guest]

dvd player has 2 gain control / separate trimmer for VCD and DVD .,remove disk , close the tray ,wait for the optical to initiate &watch the laser diode to light-up., 1st light is high intensity,next is low intensity.chk for this. if high intensity is visible chk if the consistency of light do not break during tracking movement. if this happen, replace optical cable. or better yet do some adjustment for the gain. but very careful this job is pro. alike. look for the website contain repairing sony playstation 2 ,this are similar in procedure... good luck

[Guest]

do not look directly into lens look from the side at 45% angle at least twelve inches away