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I have received a few days ago two SDI boards (bt656) to modify two Pioneer 444 dvd players. I modified the first one no problem, perfect image. Day after same work on the other one, but I connect it to my iScan hd+ and get no SDI signal. I rechecked player but all was ok, note this is the fourth 444 I modify.


Then I tested the other sdi board and again no success, while in the first player both boards are ok! Also note that while I can't get sdi signal, svideo analog output is perfect, so no shorts on the 8 bits. Power supply is ok, led on board is on.

For desperation I installed a shielded cable on clock, and tried changing the flat cable with soldered single wires, and finally modified the 82 ohm resistor at the end of the sdi chip to 75 Ohm, all with no success!

I really don't know what to now! Suggestions???
 
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