Bought this Vs daughterboard a couple of weeks ago as faulty and had a couple of hours to look at it the other night:
On power up the PCB did nothing. Checked the rom, and that was fine. Noticed that an RP2A04 CPU had been swapped for the original CPU and was fairly convinced that wouldn't work. Luckily I had a working RP2A03 in my spares, so swapped that out. Started getting lines on screen. Also checked the PPU and that had failed. I had a semi working 0002 PPU that I swapped it for. Game now booting, but getting very corrupt graphics. Looked at the RAM and was convinced that had failed. Swapped for another and then game was booting, and graphics looking a lot better, but still there were issues
I could see previous work had been done on the board. The four logic chips and ram socket had been changed. Wasn't happy with the job that was done, as legs were not very well soldered.
So took all the chips and socket off, and tested each logic chip, which revealed a faulty 161. Fitted new sockets for each IC, and the ram. Powered game up an all graphics now back to normal, and game working fine
Purity2015-09-02 13:40:05
On power up the PCB did nothing. Checked the rom, and that was fine. Noticed that an RP2A04 CPU had been swapped for the original CPU and was fairly convinced that wouldn't work. Luckily I had a working RP2A03 in my spares, so swapped that out. Started getting lines on screen. Also checked the PPU and that had failed. I had a semi working 0002 PPU that I swapped it for. Game now booting, but getting very corrupt graphics. Looked at the RAM and was convinced that had failed. Swapped for another and then game was booting, and graphics looking a lot better, but still there were issues
I could see previous work had been done on the board. The four logic chips and ram socket had been changed. Wasn't happy with the job that was done, as legs were not very well soldered.
So took all the chips and socket off, and tested each logic chip, which revealed a faulty 161. Fitted new sockets for each IC, and the ram. Powered game up an all graphics now back to normal, and game working fine
Purity2015-09-02 13:40:05
