Bought the board from a UKvac user as full working......
Board arrived showing background parallax running in the wrong order ie mountain below the ground level also found sound was outputting constant hum even with the wiper at the lowest point.
Parallax issue caused by one of the colour roms at 6j (every prom has been 🤣cut and leg repair in a so called Dil socket)
For now stabilise the leg repair brought back the background (all proms need to be replaced)
Sound issues replaced caps C17 470uf and C19 47uf helped lower but not removed the hum, all resistors were within spec so replaced all caps in the sound circuit including the ceramic at c18 finally found the wiper itself was also causing noise so replaced that too.
All good for now but needs the proms blowing asap.
Board arrived showing background parallax running in the wrong order ie mountain below the ground level also found sound was outputting constant hum even with the wiper at the lowest point.
Parallax issue caused by one of the colour roms at 6j (every prom has been 🤣cut and leg repair in a so called Dil socket)
For now stabilise the leg repair brought back the background (all proms need to be replaced)
Sound issues replaced caps C17 470uf and C19 47uf helped lower but not removed the hum, all resistors were within spec so replaced all caps in the sound circuit including the ceramic at c18 finally found the wiper itself was also causing noise so replaced that too.
All good for now but needs the proms blowing asap.
