There's no reason why low voltage would show banding unless one bank of pixel drivers - which are embedded in the glass - is dead or dying. In that case, as RobS says, turning down the brightness can sometimes restore a full picture, as the anode drivers can cope with the lower voltage in their dying state.

The bands are because the pixel drivers built into the glass do alternate column pairs (column 0 & column 127 are paired, then 1&2, 3&4... 125&126). Each pair of columns are driven by a set of 64 anode drivers, one for each pixel in that set. Both anode drivers get the same data shifted into them for every line, but the blanking signals turn the set you're not refreshing off - this then reverses for the next pair of columns.

All the pixels are driven by the same pixel data line from the main board, so if you have any display then the data is ok. By the same token, the frame sync line must be ok as must the line sync - otherwide you'd see gibberish.

The only thing I can think of - if it isn't the driver in the glass that has died - is that the blanking select pins aren't being driven correctly. This comes out of the display PIC (pin 6, IC4), goes through the PEEL (coming out as two non-overlapping signals, BK1 and BK2 on pins 12 & 13 of IC1) on the display board, and then into the display on pins 4 & 23.

These signals should look about the same (on a 1 ch scope) and like two signals which are never low at the same time if you look at them together. If one of them is high all the time, then that's why you're getting stripes. I think. ISTR that Stu at Eutronix saw something like this but the signals looked ok.

Hugo