PS2 Modchip Problem (Loud fan upon flipping power switch, no lights)

I have a v7 USA PS2 that I'm installing a Modbo 4.0 to. So far it isn't working; About 1-2 seconds after plugging in the system to the wall and flipping the power switch, the fan starts spinning louder than I've ever heard it spin. While it's spinning, neither of the eject/power LEDs are illuminated and the system isn't outputting anything to the screen. I'm still learning my way around with soldering, but I believe I did a decent job getting all the wires done. The one part that I fucked up on was the ground pin outlined in the diagram. Instead I used a spot on the grounding on the outside of the board. I can't spot any shorts or overflow of solder, but a few spots might need a better connection (probably the CX point)

Here's some pictures. I hope I didn't fry the system
http://imgur.com/a/YYhgI#rA5hT

If you need a better picture of any of the points to see them more clearly, let me know.
Thank you for reading this

 

I don't see any obvious bridging anywhere but my first bet is something is bridged on the BIOS as the PS2 will refuse to boot if anything is wrong there. Either that or your wires are too long somewhere and I've personally see long wires cause some very unusual behaviors before.

Another possibility is a cold joint or three.

 

I think the BIOS might be the culprit in this case, yes. I took a multimeter and it showed low resistance between the pin furthest to the left (Facing the modchip) and the one impatiently next to it (the "P" point). This pin (the one to the left of P) shows higher resistance than every other pin on the bios chip, which makes me think it's bridged a little. While testing ground to the other pins on the chip, the readout said something like ~350. Between P and the point next to it, it read ~75. It must be making enough of a connection to trip it up.

Edit: The pin i
m talking about that's next to the P pin is actually VCC (not ground).

Edit2: My dad (who is a radio engineer), said everything except the SX pin looked fine. Didn't suprise me as that was by far the hardest point to solder to, as it's very small and cramped. I'll try fixing it later tonight and report back if anything works.

Also, If I were to remove the 3.3V and GND connections to the ModBo, would that essentially disable it? I want to see if the console still works while bypassing the chip.

 

Test the PS14 fuse, This sometimes blows as the result of a failed mod or a shorted laser. When the fuse blows it usually takes the BA5815FM with it, disables the video output, all meaningful drive functionality, and the eject button/light. However I remember the power button and red/green light still worked when those blew and the fan speed was normal.
Edit: PS11 can blow it too.

 

Thanks for the suggestion, I'll test them later tonight. If I DID blow a fuse, can I replace the fuse and be good to go if the rest of the mod is ok?

Also, I reconnected the SX pin and it didn't help.

 

Check the fuses, replace the fuses, and remove the modchip for testing purposes. If it works then try to reinstall the chip.

Keep in mind that if the BA5815FM is blown it'll need to be replaced.

 

Ok, I tested each fuse and they're all fine. But how do I test the BA5815FM?

Also, Do I need to completely remove every wire i've connected to the motherboard or can I just remove the modchip's power source? Maybe I should have my Engineer Major friend help me with this haha.

 

Remove the wires entirely and clean up any remnants of solder. At this point making sure the PS2 still works will save a lot of possible headaches when it comes to further troubleshooting.

 

I removed the chip and all the wires but the system still doesn't work . Not sure what to at this point, as I can't spot any visible bridges.

 

At this point I think my best option is to swap the motherboard in this system for my old v7's motherboard. My old V7 was ruined by a failed laser replacement and has a blown vibration fuse (which iirc is not that unusuall for V7s?), but is otherise OK.