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The unit has a color controller PC board that switches between BW and Color. The fact that you still show color at all indicates the circuit is complete and the BW exists independently by itself. In some cases, the problem is due to connecting cables. Change out the current set and see if that presents a solution. Make certain all connections are firm and tight. Other than that, internal data switches pose a problem and the circuit needs to be traced using test equipment to locate the problem.
Did you possibly switch where your wires are hooked up? I just tried hooking my player up to a new tv and I had a black and white picture at one point. Make sure your video wires hook to the proper colored ports.
The company that made these has gone out of business, so you cannot get a replacement. However, I have a used 702 which I can sell to you for $45+shipping. It has all the parts, in original box.
I also have a used PDV-705 (this model has a remote control, plus S-Video & more), which I will sell for $60+ shipping. Both have been thoroughly tested and all works great. I can email you photos. Email me at [email protected]
good luck and warm regards,