I just ran the tests for the Sega CD and it said I had bad program RAM. Would anyone be able to tell me the ID number or where it is physically located on the board? I want to see if I can replace it and get it working.
I'm not very good with schematics. However what I did find on Console5's site is the list of ICs.
- IC101: 315-5632
- IC102: DRAM: TC511664BJ-80
- IC103: DRAM: TC511664BJ-80
- IC104: SRAM: CXK5864CM-70LL
- IC105: SRAM: CXK5864CM-70LL
- IC106: CD Error Correction LSI: LC89515
- IC107: DRAM: 424270-80 or MN414270SJ-08
- IC108: SRAM: LH5P832N-10
- IC109: SRAM: LH5P832N-10
- IC110: 315-5476A
- IC111: BIOS ROM: MPR-15764-T
- IC112: SRAM: MB8464A-80L
- IC113: CPU: MC68HC000FN12
- IC114: Battery Backup IC: MB3790
- IC115: HC74
- IC116: HC86
- IC201: DAC: LC7883KM
- IC202: DAC: LC78815M
- IC203: OpAmp: JRC 3403A
- IC204: OpAmp: JRC 3403A
- IC205: OpAmp: JRC 3404A
- IC301: +5 Regulator: NEC 2405
Program RAM is 4 banks of 131072. So it should be the dual chips at:
- IC108: SRAM: LH5P832N-10
- IC109: SRAM: LH5P832N-10
Keep in mind anything in the path form the CPU to the program RAM could be damaged: traces, logic, etc.