Page 2 of 2
Re: STFM RAM Diagnostics
Posted: 09 Feb 2021 11:18
by tzok
If you have an oscilloscope, try to observe address lines and Din/Dout lines of DRAM chips while rebooting the system. Look for lines that are always high or always low, or never reach the right voltage levels.If a chip is faulty it may short Din/out (D/Q), or its address lines to GND or Vcc, and then isolating it by disabling CAS/RAS signals won't help much.
MT1259.png
Re: STFM RAM Diagnostics
Posted: 09 Feb 2021 12:03
by Steve
tzok wrote: 09 Feb 2021 11:18
If you have an oscilloscope, try to observe address lines and Din/Dout lines of DRAM chips while rebooting the system. Look for lines that are always high or always low, or never reach the right voltage levels.If a chip is faulty it may short Din/out (D/Q), or its address lines to GND or Vcc, and then isolating it by disabling CAS/RAS signals won't help much.
MT1259.png
Thanks tzok :) that's great info