Dreamcast swirl color is driving me insane (yes you read right)

I bought this Dreamcast VA1 off ebay where some idiot took 220v to a 110v Dreamcast psu, BANG !
In 9 of 10 cases its a simple fix, but in this case...not.
Not only that the psu is blown, the motherboard was faulty too, a short on the 3,3v and 5v line.
I managed to find the problem being the A1615 transistor on the underside of the board.
Thought lucky me !
Started the thing up, it took nearly 5 Minutes till the logo appeared and it didnt go into the menu.
Well obvisiously something wrong with the bios i guesssed and swapped it for a regionfree bios (no piggyback).
This time the thing booted right to the logo, but something felt weird. I looked at the input info on my TV that said NTSC, but the color of the swirl is blue as in PAL region. I added the cable 12V->R512 and booted the region changer 1.8.1 from Dreamshell RC3. Now it gets even more weird, if i press "read" i dont get anything, if i set usa-ntsc-english press "write" and then reboot, nothing happenes.
I tried and tried, nothing worked so i decided to desolder the flash (IC502 - 29LV002) and read its contents on my programmer. Content was totally corrupted, i dont know how this even booted up. I loaded "dcus_ntsc.bin" from the Dreamshell folder on my pc into the program and reflashed it. Soldered it in the Dreamcast again and booted up...guess what...still NTSC output with blue swirl. WTF!?

Correct me if Im mistaken, but isnt the region info (121 Dreamcast for US) and all that stuff in the read only partition of the flash. Why is this thing still giving me blue swirl after i flashed the thing with us ntsc!? I even tried another 29LV002 with the same problem.
And I still cant read or write the flash with the region changer...
Reflashing the bios (IC501) works just fine.

now i have a ntsc-u board with ntsc tv output with blue pal swirl in a ntsc-j case...wow really great...

 

x

 

There is a resistor that can change ntsc or pal output from memory.

 

@Bad_Ad84
you mean the R422 ?

 

think so, its been awhile since I really did anything to a DC

 

but that is only for the output on the tv, not the internal region?

btw

i managed to get it going. i desoldered the regionfree bios, reflowed the flash area, soldered in the original bios and piggybacked the regionfree bios.
i dont know if it was a cold solderjoint on the flash or the area around it or that you cant get a reading/writing on the flash when only the regionfree bios is installed and theres the need of the original bios to set the correct hex value in the flash.
when booted up i got orange swirl with original bios, with regionfree still blue. after i booted region changer disc 1.5 with theoriginal bios, i got a reading that said it was japanese region, then swapped to american, rebooted and had orange swirl in regionfree bios too.