ddonaldson
Member
Nintendo Vs Unisystem Rom Chip Swap > No picture
What was supposed to be a 30 minute rom swap has turned into a three-hour ordeal.
I recently acquired a set of Vs. Duck Hunt roms. After reading carefully on how to remove my working Vs. Excitebike chips, i used a flat head screw driver to slowly and carefully pry them out straight up, very slowly.
One of the Vs. Duck Hunt chips had bent pins. No problem, I straightened them back up using the old mechanical pencil trick.
After I inserted the rom chips in the correct order on SW part of the PCB.
I powered it up; I heard a mechanical click (coming from either the front or the monitor) and then the screen was a light blue color. No Duck Hunt, No sound.
Reseated the chips, then the screen whet white. No duck hunt, no sound other than that single mechanical click again.
I reversed the orientation of the IC, thinking I read the manual wrong. No picture, No Duck Hunt, no sound.
I removed the additional IC (the unmarked one, that sits right next to the named IC). No picture, Duck Hunt, no sound. Reinserted the IC the correct way. Still nothing.
Thinking the chips were bad, I put the Vs. Excitebike Chips back in. The pins on these roms are super straight and very clean! Power up - No picture, no Excitebike, no sound.
I reverse the direction of the IC (thinking I had it wrong). I powered up the machine, and now the screen is purple. No sound. Mechanical sounding click.
After reviewing the boards and the diagram for the 10th time, I reorient the main IC chip to the correct placement. No picture, no Excitebike Hunt, no sound. I reseated all the chips and connectors a few times. Nothing. I know those pins are making contact in the sockets, they are a very tight fit.
Does anyone know what's wrong? Did I just f'up my Vs. Board? Is there a way to use a multimeter to check?
I have been building PCs for the last 10 years or so, and I had the PCB on a fabric-covered footstool to keep it from getting grounded. I discharged myself too before I touched anything. I heard no other electronic sounds, no snaps, no smoke, no smells.
Thanks a million in advance.
Dan
What was supposed to be a 30 minute rom swap has turned into a three-hour ordeal.
I recently acquired a set of Vs. Duck Hunt roms. After reading carefully on how to remove my working Vs. Excitebike chips, i used a flat head screw driver to slowly and carefully pry them out straight up, very slowly.
One of the Vs. Duck Hunt chips had bent pins. No problem, I straightened them back up using the old mechanical pencil trick.
After I inserted the rom chips in the correct order on SW part of the PCB.
I powered it up; I heard a mechanical click (coming from either the front or the monitor) and then the screen was a light blue color. No Duck Hunt, No sound.
Reseated the chips, then the screen whet white. No duck hunt, no sound other than that single mechanical click again.
I reversed the orientation of the IC, thinking I read the manual wrong. No picture, No Duck Hunt, no sound.
I removed the additional IC (the unmarked one, that sits right next to the named IC). No picture, Duck Hunt, no sound. Reinserted the IC the correct way. Still nothing.
Thinking the chips were bad, I put the Vs. Excitebike Chips back in. The pins on these roms are super straight and very clean! Power up - No picture, no Excitebike, no sound.
I reverse the direction of the IC (thinking I had it wrong). I powered up the machine, and now the screen is purple. No sound. Mechanical sounding click.
After reviewing the boards and the diagram for the 10th time, I reorient the main IC chip to the correct placement. No picture, no Excitebike Hunt, no sound. I reseated all the chips and connectors a few times. Nothing. I know those pins are making contact in the sockets, they are a very tight fit.
Does anyone know what's wrong? Did I just f'up my Vs. Board? Is there a way to use a multimeter to check?
I have been building PCs for the last 10 years or so, and I had the PCB on a fabric-covered footstool to keep it from getting grounded. I discharged myself too before I touched anything. I heard no other electronic sounds, no snaps, no smoke, no smells.
Thanks a million in advance.
Dan

