Greatings!.

Trying to debug a problem, I have narrowed to the fliptronic II on a NO fear.
When I connect the ribbon cable To fliptronic J903, game delays power up, (stay more time showing Testing) and sound board doesnt work, I mean NO sound, and Sound interface error on test report, And! I got vertical lines on the DMD display.

If I remove J903 from the fliptronic, sound board works (with sounds and all) and DMD display Its perfect.

So I guess the logic part of the flitronic board is confusing the other boards.
Tried with a working new ribbon cable, (same results).
Reflowed J903 and ribbon connector from the MPU (same results).
On my desk, I noticed that I got continuity from J904 pin1 (5v) with J904 pin 5 (ground) So I narrowed down the problem, and removed U5 (74LS244) and the continuity went away.
I replaced U4 and U6 (LM339s) no luck.
If I test with diode test j094 pin1 with pin 5 and now I get .247

Test all the Tip102 and Tip36c, and test good on board with mi DMM.

Any ideas?

THANKS!

Solved!!! Was U2 . had some kind of luck and suspected. About that ic. All good now!!!

Thanks everybody