dafa_123

Hello, I have an old PCChips M507 that I am unable to upgrade the BIOS. I have tried several BIOS tools and they all come back saying that the BIOS chip in Unknown. I have an EEPROM Programmer but I do not know the type of EEPROM to select. Here is a picture of the board's BIOS chip. Any help will be appreciated.

I removed the Gigabyte IC and the short is gone. If I find a working one I will replace it and hopefully the board will come back to life. Thanks everyone.

I tried to inject power on the +5vsb pin with the bench PSU and nothing is warming up. I cranked the amp up to 1 and only used around 200 mA at 5v. I think that I will mark this board as dead and use it for parts unless someone has another idea. Thanks.

Hello, My Gigabyte GA-6VXE7+ just died. It will not power up at all with a good PSU. No apparent visual damage. When I check the power rails, I see that +5vsb is connected to ground. All the others are not shorted. The damage was most likely done when the old PSU died. I tested with a known good PSU and the MB won't even power or post. the only thing I can see is that +5vsb is grounded. I've checked every component that I can check and none seem to be shorted. There are 2 capacitors and a regulator that have there pins to ground but I have removed them and tested them and they are good. The pads are still grounded even when the components marked in red are removed. Unless the issue is in the chipset, any idea where I can look?

Got it used from a friend in France. Should be getting it in a few weeks.

I am waiting for a replacement PPU.

Hello, I have a Sega Saturn that will not power up. I cannot find any schematic for the Yamaha XS205 Rev C power supply. I believe that the transformer is bad. I get continuity on the high voltage side but not on the low voltage side. On the high voltage side, I get ±160v DC but nothing on the low voltage. I am unable to find the part number of the transformer. The transformer is green and the number on top shows: XR909 A T64. Anyone know a replacement part number for that transformer? Thanks.

Indeed. I don't mind trying. I only need a schematic to built a 15kHz signal generator that can replicate the one on the SNES. I have a working SNES to compare the signal to. You don't have such a schematic by any chance?

As I suspected, on the defective SNES, I get no signal on pin 100 of PPU2 U3. When I compare to a working SNES (See picture), which gets a 15kHz signal on pin 100. Does anyone know if it would be possible to create a replacement 15kHz RSYNC using an external circuit? Would it work? Thnaks.

If I check with an oscilloscope, what kind of signal should I be getting out of pin 100? If I had a reference, I could compare.

Do you know if pin 100 of U3 is the one doing the video sync?

I checked all the lines for the PPUs and RAM and everything looks fine. I also checked the grounds and VCC and they also llook fine. When I look at the electric diagram, I see pin 100 of PPU2 U3 that says CSYNC that goes to both the RF Module and the AV out connector. Does anyone know if that is what is used to sync the image on the TV? If U3 is not sending the correct signal out of pin 100, could that be the issue? Thanks.

I have the same issue with RF.

Do you know a good RGB Mod for the SNES?

I have tested with a different PSU and cables. I have another SNES that works fine with the all my cables and both PSU that I have. Since I have the same issue with RF and RCA, the issues seems to be elsewhere.