1970s Zenith Console - Troubleshooting

[ThePlague]

Hello all,

I recently acquired this 1970s Zenith. From what I can gather, the chassis is 25DC56 or 25DC57.

The seller provided video proof of it working prior to being stored in the garage for ~year. There is a slight letterbox burn in on the tube. Hopefully this won't be an issue when playing content.

Currently, I plugged the unit in for the first time and upon turning it on I smelled ozone. It is currently non-responsive. There was no audio present either or else I would suspect the HV circuit.

Does anyone have any experience or item to check on this particular chassis before I begin replacing capacitors in the power supply section?