I find it curious that the display and the band went dead. the display is pretty far removed from the band circuity. Is the display still out? Is it only black on 30M?
Do you hear anything on 30?
I don't know anything about your rig either, but some things are almost "givens" in the design and failure modes HF radios.
The 30 meter PLL Unit oscillator, Q2, has failed. This resulted in the PLL Unit to change from LOCK to UNLOCK for "30 meter band ONLY". When this happens the display will go dark. the 30 meter VCO will be turned OFF, and the band in question will no longer TX and RX. This is normal and can happen to one band ONLY!! The PLL, when it changes from LOCK to UNLOCK, will turn the display OFF and that's also normal. Switching to another band that works the PLL Unit switch to LOCK state, turning the display back on, and the TX/RX works. Again, this is all normal.
I recommend you troubleshoot the PLL Unit's failed 30 meter circuit, Q2, on the PLL Unit board. Read the alignment section in the service manual for the PLL Unit and VCO oscillators. Study the block diagrams in the service manual how the PLL Unit works so you learn how the PLL Unit works..
If you don't have the TS-130 service manual, you can download it from my website in the Manuals, Docs, and Mods page.