Convert MCA into MCA-Plus (Discussion)

[oscarboiro]

Hello!!! after some weeks of a lot of work at home, now i'm retourned to my hobbye.
Yesterday i take few minutes to serch components, but i have some doubts.
in the next components, i see some offers, but have different resistor values, what value is necessary?
BLM18AG (0603)
BLM18AG (0805)
BLM21AG (0805)

and, the capacitors are all to 25v? the 50v are ok?

[Go4IT]

Hey Oscar, great to know you're on it!
I put a complete BOM here in the wiki https://mk4-wiki.denkdose.de/artikel/na ... achruesten
The resistor value for BLM are all 1 kOhm.
For the caps, any voltage above 5V should do...

Good luck!

[oscarboiro]

Hey Oscar, great to know you're on it!
I put a complete BOM here in the wiki https://mk4-wiki.denkdose.de/artikel/na ... achruesten
The resistor value for BLM are all 1 kOhm.
For the caps, any voltage above 5V should do...

Good luck!

Thanks!! Tomorrow I can search the parts and prepare order to buy all.
When I have news I will write here!

[oscarboiro]

Hello, after some time disconnected and working in another proyects, today i received the last components to made this mod.
im impaciently to end work, but this mod need time and no run.

When i finish, i take a pictures of my process and result, i think everithing will be fine!!!

Thanks Go4IT, withouth your information and help this mod for me are impossible to made it.

[Go4IT]

Hey mate, i wish you much luck and hopefully success by first run!
Would be glad to see pictures of your work

[oscarboiro]

The graphics board at 99%
Only need install the oscilator, i received a wrong part and need buy another new.
The work have a good aspect, i need to improve but I’m happy with result. hope it works when i finish it.

4C316030-9421-4309-9B9B-FB5F00CF2682.jpeg

F2F8BCDD-5385-4C85-9483-767A6CAA73C3.jpeg

Thanks Got4IT

[Go4IT]

Well done, young Padawan! Those resistor-arrays are hard to solder by hand, because they are so small...
I'm really excited if it works right away. Fingers crossed!

[oscarboiro]

Today I received the oscillator and i install it.

79C0AF39-C8AC-46A9-BDC4-C36C7FE87D32.jpeg

6B6AC256-8917-4FEC-A058-56EDE6E37654.jpeg

I put the graphic board in the unit and install service pack update.

C699AB14-99B0-45A2-A791-41592F5E25A4.jpeg

After reboot, I try the video mode. But have a little
Problem with signal. I take a video:

https://drive.google.com/file/d/15a9w6L ... GtQ4oNkvyY

Now have a lot of hot in my work space, more than 35 degrees, but tonight I go to test all new components. And I hope to find a problem.

The video input is near!!!

Thanks Go4IT!!!

[oscarboiro]

After some time looking all parts, i found different part un video ADC.

from instructions need ADV7181C, and i have 1x ADV7181B

I look the graphic board of NX (DVD) and have ADV7181B

no i go to dowload datasheet and search difference in the pinout etc

is possible the problem comes from wront video ADC?

[Go4IT]

from instructions need ADV7181C, and i have 1x ADV7181B
is possible the problem comes from wront video ADC?

Definitively, they ARE DIFFERENT!
"C" is needed for MCA graphicsboard to work:

diff_adv7181c_and_adv7181b.png

I look the graphic board of NX (DVD) and have ADV7181B

Oh boy, you should have better looked at my BOM instead... such a pitty.

Besides it's interesting to know that NX-Plus uses the B-Version, we know that the NX graphicsboard is different from MCA.

So, don't let this drag you down - Go fetch a C-Version, replace it and you are there!