Atari Lynx troubleshooting?

[nasune]

So a long time ago I bought two Lynxes, and managed to get one working unit out of the deal (one didn't work at all, and the other worked, but somehow they managed to melt the battery compartment so transferring the mainboard of the working one into the shell of the broken one gave me a working unit). And yesterday I came across a usb mod for the lynx, which I decided to try on the non working unit since, from what I've read, a main point of failure is the power circuit on those things (which should be bypassed by doing the mod). Failing the mod (although it's a very simple one) wouldn't cost me anything since the unit didn't work to begin with.
The mod itself seems to work, but all I'm getting is a black screen and a popping sound on startup. After opening it up again and removing the shielding (plus installing a wire between pin 31 and 33 on the cartridge connector), with a purely visual inspection, nothing seems to be wrong except for one capacitor (I think it was C39) that had some corrosion on the legs. Could this one cap be the culprit, or should I check some other points first? (in order to prevent me from ordering and replacing the cap only for it to be for naught).

edit: After a little poking around, it seems that C39 is part of the power array which is bypassed by using the usb mod. Which leaves me at step one with no idea what the issue could be.

 

[nasune]

While this is a necro bump (as well as a double post I'm afraid), I do have some new information. After removing the shield to check the chips underneath it appears that the Suzy chip might be faulty. While there is no visual damage, the chip gets quite a bit warmer than any of the surrounding chips (not scalding hot (at least not for the minute that it was on) but warm to the touch). Does anyone know whether there is anything in the surrounding area that could lead to this, or is it indeed just the chip? (the power array is bypassed so whatever the issue is, that's not it)

If it is indeed the chip in question then that'll be the end of that (for two reasons: one I don't have a hot air rework station, and two: the replacement chips I could find were more expensive than just buying another Lynx).