Bungled LCD install, need help diagnosing 5V problem

[Justsomedude]

I've seen some great and helpful replies here, and I'm hoping someone can help me revive a Lynx 2 that I've accidentally destroyed...  I did the capacitor kit and 5v replacement parts and tested fine with original screen. So while installing a BV lcd, I had to swap it back and forth between another unit (thought I had a bad LCD, I did not). While reinstalling the lcd in my V2, I accidentally tied the 5V and GND backwards. Yeah, my bad, should have used different colors. The unit powered on, game booted with slightly scrambled screen, then slowly dimmed. This is when I took it apart and noticed I tied the power backwards. I swapped the LCD and it's fine, the problem is definitely the Lynx. 

 

Now there is no response with power on button. When I tie 5v to C41, the system boots the game (can hear sound) but no screen output, slight flash on boot.

 

I tried another 5V kit because I had one on hand. Still no power button functionality. However, when I tied C41 to 5v, now the system booted the screen, slightly scrambled again, and slowly dimmed. Just like when I first powered it backwards. This only happened once, so something in that 5v kit fried I think.

 

Anyone willing to help me troubleshoot this? I really think it's repairable, and I have a donor board if neede

 

THANK YOU!

[+-^CrossBow^-]

Is this using the solderless kit from Ben or the older style that had to be soldered into place?

 

Not sure about the screen dimming out part, but if you can get it to power on bypassing the power section through C41, then it is likely an issue with U6 since you've already replaced out the more common parts in the power stage section.

[Justsomedude]

It was the new solderless type, but I did not have the ribbon cable, so was soldering it. So I was using the 5V solder position (from the cartridge slot). So I'm thinking whatever is immediately downstream of that point is what fried