I'm new here and i hope to find some help with the following problem.
I own a Fat PS2 (SCPH-30004 R which is a PAL-Version with a GH-013 Board) with a MODBO V2.1 Modchip. After fixing some problems with spareparts of other PS2 i had here around (Changeing the lensloop because of burned coils and adjusting the laser potentiometers to 1100 Ohms(now perfect reading PS1 and PS2 games and backups),Modding with the chip i found in another PS2 (i searched in the web where to mount it and mounted it at the best place with shortest wiring connections)) .
When I wanted to test the PS2 i noticed that when i press start(controller) while switching on the box the chip shows "Disabled" what is correct so far, but then it hangs and nothing happens, when I reset my PS2 the Chip is activated again and works fine. The Problem is that i am not able to boot the PS2 normaly without chip, because it does not matter how short the time is I press the Reset-Button it is everytime a full reset.
I tried to change the resistance between reset-Pad and modchip from 33K (normal chip setup) Ohms up to 500 k Ohms in two steps of 250 k Ohms without efect, I tried to connect without resistor (0 Ohms) without effect and I tried to solder the G (not neccessary until V8) and H (for NTSC Versions) pins which normaly are not used in my Version to ground without effect.
So I hope some of you have some other Ideas to fix my problem.
Now I also tested to use better Ground and VCC (3,3V) wirings also without effect, now I am really going crazy.