I've seen lots of same Hitachi RPTV sets with same convergence problems.
The most common defected part is the digital convergence module(aka CHIP BOARD). Factory asks $300 for a new one. I fixed one module by replacing E2prom(SMT) and some leak SMT capacitors on that board.
After you have E2prom and caps replaced, Enter service mode by shorting 2 test pins (behind focus pack).
It will take another 2-3 hours to get pre initialized convergence DONE!