[weblacky]

Well...I tried some stuff but I'm afraid I'm at a stand still for now.

I assumed SRAM labels were the matching ones on the PCB stencils, and I assumed the Pin indications used the address-matrix on the underside of the PCB (BGA SRAM test pads):

   

The only issue I have is the PROCESSOR SIDE..I cannot figure out the address of pins on the CPU-side (nor have I found ANY online docs to help me).  I was hoping that the CPU used some kind of bus multiplexer to address the SRAM and have some components sitting between the CPU and SRAM BGA chips.  I cannot readily find any!!!!  Curve tracking measurements show the same zener diode signature on the SRAM to GROUND defined Pins (so the GBA chip pin interface appears to have its diode protection in place).

But I cannot make heads or tails on the CPU side.  If I KNEW my fluke 189 Continuity test voltage than I'd think about trying to FIND the corresponding pins on the test points on the underside..but I'd need to be like 1V or less to do that for my comfort zone.

I was hoping for a protection diode and addressing plexing system that might have an issue with these specific lines:


      Asterix R14K  CPU  C3D1 [Pin  AK1]  SRAM C8B7  [Pin D1]
      Asterix R14K  CPU  C3D1 [Pin AA27]  SRAM C8E6  [Pin H1]
      Asterix R14K  CPU  C3D1 [Pin AD30]  SRAM C8E6  [Pin H3]
      Asterix R14K  CPU  C3D1 [Pin AG33]  SRAM C8E6  [Pin H8]
      Asterix R14K  CPU  C3D1 [Pin AK30]  SRAM C8E6  [Pin D1]

But nothing so far...I also ASSUME this isn't a config issue because while I AM currently configured for an R16000 700Mhz CPU, this error correctly IDs the R14000 600 Mhz CPU I'm repairing...so I assume it knows it's own SRAM config.

I feel like I'm very close...sad part it that since I don't KNOW what the PIMM 5V rail was for, the fact that it was at 6.25V for a time may have actually damaged something I cannot replace.

Any docs, hints, or external help would be appreciated.