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::I have a TS-940 that had the same problem (freq.drift, blank display). Was a problem on the PLL board. If I tapped/slapped the top of the transceiver or tap the PLL board, it would also cause the rig to jump off freq., warble or make the display go blank. It was caused by several broken solder joints on the bottom side of the PLL board. Using a magnifying glass I found "rings" around the component leads on the solder joints which were solder fractures. This has happended twice on my rig, both on very hot days. Now I avoid operating the rig when it gets hot in the shack (90-100 degrees) and have not had the problem since. Have owned the 940 for 13yrs now. You may want to inspect the solder joints on that board with a magnifying glass before replacing parts.
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