iVirtualZero
Forum Replies Created
-
AuthorPosts
-
October 1, 2024 at 12:21 AM in reply to: Investigating the Black Screen Faults in the Sega Saturn #63558
It’s definitely not always, as I have repaired a bunch of Black Screen faults which indicates general hardware failure. Usually excess heat getting to the PLL damages it, but that’s not always the case. Sometimes a reflow, 1 person fixed there’s by reflowing the PLL chip though recommend to be quick with the reflow using flux and lead free solder, and or a recap, or replacing the Clock battery, PSU, bad inductors labelled L1 and beyond, or replacing the VHC04 IC fixes it or there could be a bad trace somewhere. It’s always worth diagnosing it to determine what’s really going on. I wish I had and knew how to use an Oscilloscope, since this will need a Schematic level investigation. But I do wish somebody with the skills can manage to reverse engineer the heat sensitive PLL IC’s code since there are likely substitute IC’s out there to replace it, perhaps integrate the DFO mod into it with the ability to switch from 50 to 60hz.
- This reply was modified 4 days, 7 hours ago by iVirtualZero.
- This reply was modified 4 days, 7 hours ago by iVirtualZero.
- This reply was modified 4 days, 7 hours ago by iVirtualZero.
- This reply was modified 4 days, 7 hours ago by iVirtualZero.
.
- This reply was modified 1 year ago by iVirtualZero.
- This reply was modified 1 year ago by iVirtualZero.
Yes that would be appreciated to reverse engineer it and come out with a way to clone this with a more reliable chip that isn’t heat sensitive. I have two units VA0’s that i have recapped and even with that i’m still getting a black screen. The other one i remember i damaged a bunch of traces on the bios fixing it and recapping it got it working for a bit until i randomly lost video and got a black screen. The others all of the traces are intact but i think the excess heat may have damaged the PLL. And the rest i have yet to recap and find out. I also have yet to see if replacing the EMI Filters could fix some of these. I think if i try this one last fix on these two units and nothing happens, then i will be happy to sell to you as it’s pretty much guaranteed to be a bad PLL causing it to not boot.
Yes it would be a repair dream come true. It mainly affects model 1’s and i would love to see a modern replacement for both the model 1 and the model 2. Perhaps a more custom DFO mod.
Fixed it. Redid all of this. And corrected that green wire which was going to the wrong trace.
Pictures of my work
Sega Saturn Trace Repair help. I’m still getting a black screen.
I only have a multimeter.
I have desolderd the RGB and CSync from the CPU and have soldered them to the bottom of the board. R6, R7, R8, soldered csync aswell. But i still get a Black screen. Source for install. https://shmups.system11.org/viewtopic.php?f=6&t=58863&start=270
The cable is from RetroGameCables NTSC SNES CSync 470ohm cables.
-
AuthorPosts