How to modify a set top DVD/Blu Ray player for 12V operation

Do you have a schematic or datasheet for your DVD?

Clem

No schematic but I do have photos of the power supply board, both sides, so I can reverse engineer the schematic.  It may be simpler for me to just measure strategic test points on the board, remove AC, and then inject 12V where the supply provides that and see if I get a functioning unit.  The power supply not only provides +12V, but also Vcc (probably 5V or 3.3V) for the main circuit board as well as 5V for a USB connection and pass through for the power and eject buttons, LED, and IR sensor.

Pins to the main board are labeled +12V, GND, IROUT, Vcc, GND, USBP, USBM, USB_Vcc, VSTB, VSCK, LED, and GND, so these should help a lot, too.

I'm not a blu-ray expert but suspect this is about as simple as a power supply could get for these devices.

Oh, and schematics seem to be available out there for a fee.

John

Hi John,

Post the pictures that you have for the board. Hopefully the power supply board is separate and not integrated with the main board.  From what you describe the power supply is probably a switch mode power supply (SMPS). If it is a SMPS just injecting 12 volts where it presently is will not generate the other voltages that you may need. They will likely come from unique taps on the high frequency transformer. Once you identify what is needed for voltages, most likely, you will have to use separate DC to DC converters to get to the other voltages. There are small DC to DC variable voltage converters low cost converters available from e-bay that could be used. If you are able to purchase that schematic that you mentioned it might eliminate some of the guess work.

John W.

I didn't want to turn this into a problem solving session as I'd like to enjoy the work myself - I just started it out as a suggestion for the show (though I am convinced it really is quite trivial for that).  Anyway, here are the pix, grabbed from an ebay auction of the same model board as I've not removed my board yet. - john

From what I can see this is a quite simple SMPS and only has a single voltage output of 12 volts. If there is further voltage conversion being done it is on the other boards and probably as needed to power logic. I would be surprised if this board is capable of much over 2 amps at 12 volts. It will be fun to follow your progress as you do your project so please post some more pictures and details of how it turns out.

John

From what I can see this is a quite simple SMPS and only has a single voltage output of 12 volts. If there is further voltage conversion being done it is on the other boards and probably as needed to power logic. I would be surprised if this board is capable of much over 2 amps at 12 volts. It will be fun to follow your progress as you do your project so please post some more pictures and details of how it turns out.

John