When I switch on the game, some ordered lamps are dark in game over mode, where they should blink as the other ones. These lamps correspond to the row 8 of the lamp marix. I tested Q83 which grounds the lamps of the row but this one looks good.
In addition, the start button lamp is on row 8, this one works. The wiring is connected to j135 pin 9. I presume that the driver works ok, and there must be something wrong with the row wiring in the cabinet. Voltage measured on both ends of the lamps is close to zero, stable.
I removed the row connector j133 and tested the voltages on each individual wire of the female plug. I read about 15vdc on each, except the row 8 which shows about 8 vdc.
At this point I have question, if connector j133 is unplugged, these voltages do not come from the driver board, where do they come from ? Then, what can explain that the row 8 wire (nb 9) reads a value lower than the others ?
Thanks for your valuable help