Game Gear Shut Down problem after caps change...

Hi all!
I recently changed all the caps of a nonfunctional game gear (Mother board, Audio board & Power board), it was a routine job that I have performed many times before, but this one acts very weirdly now.
When I started it, either with batteries or via the SEGA 9V 500mA AC adaptor, both video and audio worked fine, but when I connected the audio jack to the PC speakers the game gear turned off.
When I restarted it, the LCD turned on without displaying anything and no audio but after a few secs both the power led and LCD shut down and it persists with each try now.

I tried the motherboard with a different working audio board & power board but the same problem persists.

So, I changed all the caps again with different ones in case I had ran into a defective one, but again the game gear worked for a few secs and again it shut down after some time and the same phenomenon persists.

If I leave the game gear off for some hours and start it, it will work but again after some time it will shut down and the same problem will repeat itself.
I have careful checked the main mother board for any other defective components including the 2 fuses on the side of the LCD, but I have not been able to isolated anything defective which would explain this behavior.


If anybody has an idea of what could be wrong and how I could fix this, I would highly appreciate it.
Thanks in advance.

Some photos:

 

Those caps on the audio board look quite a mess. I would first of all remove all the audio caps clean the pads and replace with new ones.

I always replace those when re-capping Game Gears. If the issue is still happening I'd check for shorts from the audio jack.

 

The caps on the audio board have been replaced. I tried it without any audio board connected to it and the same problem occurs.
I'll check the audio jack it self for shorts and I'll re-install the audio caps again and clean the pads again.

 

I would redo the caps in your second picture and try to start it without the audio board.