[Kenwood] TS-930 Dispaly Problem

[Dennis McGrew]

After being turned on for about 3 hours the frequency display of my TS-
930 blanks out when I rapidly spin the main tuning knob "Down" in
frequency. I have adjusted both pots on the main shaft encoder pcb,
even subbed a spare encoder to no avail. I've put jumpers in all the
via's, reflow soldered all joints on the digital pcb, and replaced all
the components in the signal path from the encoder to the
microprocessor. The display does not fail when cold or when I spin the
main tuning knob "UP" in frequency. Other than replacing the digital
pcb, can anyone offer a solution to this problem? Thanks!