Question from Joe: Hey guys,

I finally got my monitor issues fixed! It ended up I had two ground wires on my Jamma harness that had been cut and just twisted together. When I touched them to check the connection the picture came in perfectly. Now I have as good as new looking monitor. The TV tube swap was so easy once I found a compatible TV. I was able to leave everything on the new tube, the yoke, grounding wire and degaussing wire. I only had to splice the yoke wires to the old connector and plug everything else in. The picture looks great!

Now my issue is no sound. I have checked the pot which is soldered on the sound board. The voltage going through it changes when I turn the knob, so I assume it is OK. I did a continuity test on all the wires to the speakers and they seem to be good. I checked that the speakers actually worked. I also checked the voltage at the Jamma harness as specified in the operator’s manual. I have also checked the ribbon cable between the sound board and pcb. I made sure the red line was plugged into the # 1 pin on both boards. I thought the cable may be bad so I did some improvising and found a new hard drive ribbon cable and plugged it up in place, with no change. I tried reseating the chips on the sound board and all the traces looked good. I have not examined the pcb yet.

Do you have any suggestions on what I should try next?

By the way my voltages at the Jamma harness are: 11.86, 4.82, and -5.23. I know the 5 volt is more important to be right on than the 12 volt, but is the positive or negative 5 volt more important.

I love all your videos and podcasts.

Keep up the good work,
Joe