Well we can add another 3 hours of footage, sadly a lot of this footage is going to be a bit difficult to share unless i do quite a lot of work on it (its now 20 odd gb of footage) as I was streaming it to a repair community and it got a bit sweary/busy in a few places and I spend a lot of time talking to the people watching and not a lot of time explaining what I am doing,
@NutritioN your gg is now known as the GG that will only ever run marble madness... Anyway, this one is being a nightmare! I managed to get it displaying some stuff on the old LCD after a recap (only 1 game would work at all and its display was slightly corrupt) but after a while (several hours of troubleshooting) I managed to get something that looked like it should work display wise so went ahead with the IPS install... now I can't get it to display.
I've taken off the VRAM and tested every trace, I've taken off the SDRAM and have tested every trace. All the traces below those chips and going from those chips are fine. So I put the two chips back on. I've now got the two sega IC's off the board and am testing all the traces to and from those IC's. Once I have tested all of these and am happy ill put the sega chips back on. I did notice that the card slot compared to mine has a loser connection so have done some work on that but im still not 100% convinced by it.
We know something is not right, I have just got to find out what. 90% of the traces out of the cart slot head over to the vram IC so that's the main culprit right now, the remaining traces head over to the sega IC closest to the cart slot which is the audio chip. Tomorrow ill put it onto my GG to see if it works, next im not 100% on the cart slot and don't trust it but ive tested the life out of it and it 'Seems" fine but im still not 100% confident in it. There are basically 8 main parts to the puzzle, there are 6 IC's, the cart slot and then the traces on the board. This GG also has this odd thing that I havent had on any other board yet and it smells rancid when working on it almost like fish. I did some googling and it's apparently from caps that have emptied their electrolyte fluids so before i work on it tomorrow im going to give the board a bath in deionised water just in case that helps us out.
Little break down of what we know:
Things we know 100% work
- recapped power board - Tested in my GG
- recapped sound board - Tested in my GG
- LCD screen.- Tested in my GG
- contrast wheel is working and changing screen brightness so im pretty sure the screen daughter board is working.
Mainboard working:
- vcc rail is perfect, a perfect 5.1v. The GG powers up perfectly and has no power issues. Our issues are somewhere in it's data lines. That's either it's not making good contact with carts as the most basic down to a faulty IC or two as a worst case.
Mainboard not working:
- Audio - Something is very wrong with audio and I have not yet managed to get any recognisable audio out of the GG. This is tied somewhat to a working video so atm im putting this to the side.
- Video - You can see above I have had some sort of video, just not reliable video of any sort (bar around 10 mins where I had perfect ish video for that 10 mins on only 1 of my 8 or so games though.)
I'm going to go all out though and will make this GG work, even if I have to transplant every IC one at a time onto my GG to work out which one is faulty or even swap out it's cart slot, whatever it is I will find it, there are only so many components on the board and im willing to transplant them onto my GG one at a time to test them if that is what it ends up taking.