Please see also TofPCBComments27Nov2019 as many things there are not done yet.

HV Board

• Change R20 and R21 to 10M and 1M respectively. Also change them to a larger footprint or thru-hole which is rated for > 200V
• Ground wiring around U8 and U10 is unacceptable. Use one GND via minimum for each 1-2 connections.
  • See ​http://ohm.bu.edu/~hazen/elbat_tof/2019/HV_gnd_layout.pdf
  • Similar story for -5V, -195V and
  • Same for U9 and U11 but use -195V instead