Hi and welcome to Beoworld! I checked the BV1 service manuals available on Beoworld, and unfortunately they don't go down to circuit board level.  BV1 was one of the early B&O products that moved to a system of 'module replacement' rather than component level repair, with faulty modules being sent back to the factory. If the BV1 was based upon an earlier B&O TV then there may be a similar service manual available, but failing that I would think that a good old fashioned TV repairer (if you can find one) could has a good guess at the component required.  Or perhaps a Beoworld member has a BV1 that they are prepared to look inside.