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The dual battery was just a test for 10 minutes.
I reinstalled the chip and now works as before.
Not a power section problem.

The pcb is triple-checked and cleaned with isoprop,
most of the components have been replaced, just to make sure everything is ok.
There is no short circuit in the pcb.

I have a feeling that it is possibly a topology issue, due to the lack of the crunch gain pot.
The tracks around the pot are not connected or grounded, so they form an antenna or something,
that affects the clipping stage.

Still investigating....

The whine is only heard when using passive pickups, there has to be something wrong with the input section.
My strat has EMG installed and I hear no whine (all pots @10).
Note that the leds in the clipping section are lightly on when the whine occurs.
I have tried shielded cable but nothing changes.

No special mod, 2 switches (bypass and boost), just haven't used the crunch pot and
shorted the switch on the high-gain side

If not just a whine, it is an oscillation in the 2nd stage where the clipping occurs.

Here it is

Hello guys,
I have just finished boneyard and it really rips, it really nails the tone I am after!!!

I am experiencing the same problem, lots of whine without an obvious reason.
The whine goes away only when I turn down the tone knob or by lowering the gain or level.
It is not the max chip to blame. For testing, I altered the circuit to use double 9v batteries and
the whine is still there and very loud.
I have tried all the fixes madbean mentioned but nothing seems to make the whine go away.
Any ideas?