Check the voltage on EN pin. As you changed this IC and it still does not work, most likely, there is just no enable signal. And therefore, an actual fault is somewhere else.
Thanks wrapper, the Enable pin is tied to a Delay start circuit formed by a resistor and capacitor in series over the 19V lines. The pin read 19Vdc.
However,
There is one thing I noticed. As Ton provided the datasheet, I am able to trace the circuit and noticed that a 0402 high side boast capacitor is missing [left of IC and hugging it]. I must have braided it off during the post pad desoldering process of the FR9706. But I doubt one small tiny 0402 capacitor will make me detect zero burst/pulse at any one of the pins since the OSC is a independent circuit.
Here are the Pins voltages;
Pin1 = 0.03;
Pin 2 = 1.65
Pin 3 = 19
Pin 4 = 0.086
Pin 5 = 0
Pin 6 = 0.048
Pin 7 = 0.27
Pin 8 = 19
In case you are wondering, Pin 1 voltage is correct, as other similar IC [SS = PIN 8], like the FR 9888 and the FR 9886 measured same voltage at the pin. I reckoned that my fluke meter over-loaded the 6uA, somewhat?
Ton provided datasheet traced almost identical to the circuit. According to the datasheet, the capacitor is 10nF. I have no intention of stocking 0402 capacitor and have absolutely no thrill in working with tiny creature. Will update once I can land my hand onto the 0402 cap.