HDMI Dissappeared after storm but the component still works on tv- is this repairable or cost effective

The HDMI processor section circuit should be troubleshooted. Work is a skilled one. Contact any experienced service technician. If you are not familiar with electronics, do not attempt to repair. Whether you suffer fatal electrical shock! Instead, contact the nearest service center

If you are mechanically inclined and have tools you can unplug and remove the back of the set. Photograph all stickers on the board with HDMI connectors. This is usually called the "Main Board". Search Youtube for instructions to read the board's part number. Then search online stores for that part. You may find a used board taken from a working set with broken LCD panel. Buy online only if the seller will allow you to return it for a refund if it does not fix your set.