The chip is powered with a negative voltage, to be tied to pin 27 (Vdd) of the MN6076 chip. The chip's reference voltage is tied to pin 28 of the chip (Vss), which is the reference for the positive voltage supply. The inverse powering is due to the fact that the chip is designed to drive electro-fluorescent displays directly. In any case, What you need is to tie 4 10K resistors, right at the chip. all 4 resistors have one end tied together, and then tied to pin 27 of the chip. Then, the other end of the resistors are to be tied, individually, to the the following pins: 29, 30, 31, and 36. That should solve most issues with these units.
What is shown above looks correct, but needs one more pull-down, the one to pin 36. This cures the issue with the unit tending to run fast, thinking that it is set for 50 Hz, when the switch is set to 60 Hz, allowing the pin to float to an indeterminate level, due to failing internal pull-down..
Be careful, and if you do not understand my post, do nothing until you do understand.
Good luck,
Rich P