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You more than likely have a bad power supply. The caps in the output circuit are pretty crappy and are well known for failure.
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There are two common problems that occur with the CH-300 DVD player. Either the machine will not power up at all and the power indicator won't work or after a disk has been inserted the on screen display will say "loading disk" but then say "bad disk". First remove the top cover secured wih screws, you will now be able to identify the power supply board. At the output connector measure the 5 volt output with a voltmeter. If less than 4V, than the unit will not work properly. The filter capacitors are bad. Replace C10, 2200uf@ 10V and C11, 1000uf@ 10V. Because of the limited space provided, use capacitors of the same physical size. Do not try to pigtail a larger cap in its place. The circuit will not operate properly. I can supply these if you can't find them locally.
You have not said the TYPE of CD or DVD you are trying to play.
Your manual will clearly state what can be played and what cannot. ALSO, some mfg's like mine (samsung blu-ray) provided software or firmware updates you can d/l to flash drive or burn on cd and insert.
Check manual and your mfg websit for what's available.
Reset you player by doing the following:
With the player on, hooked properly to your television, and on the correct station:
Open the tray
Close the tray (with no DVD inserted)
Hold the stop button down for a full 5 seconds
The CyberHome screen should appear. You should be able to play your dvd's now.
I had the same problem, After googling for a few minutes I found the reset procedure for this player.
1. Turn it on. 2. Eject any disk you have in there and close the tray. 3. Hold down the "STOP" button on the player (not remote) until the green light flashes red and the system reboots. 4. Insert disk and enjoy.
I have the same problem with some of the Discs I have burned. Most people say the power supply, but I have 2 of these units so I swapped the power supply to see if that was it. The problem stayed in the one machine, ruling out the power supply.
If you are using a copied disc try a real one. But this model of DVD Player is made so cheap. it sound like the laser assembly is bad or the motor that spins the disc is stuck or going out. If you are good at electroninics you could take the lid off load a disc and see if it spins if not give it a spin clockwise and see if it takes off. You probably should replace unit for price of a new one.