Sounds like a pip module or comb filter with the video distortion but here
are some repair world tips hope they can help:

Results

TELEVISION HITACHI 46UX10BF AP23 chas Intermittent no start up, and
vertical collapse. Replace C659 1uf@50v
TELEVISION hitachi 50ux10b 50ux11k 46ux10 HV sync bad, red color , dark,
b/w picture sometimes comb filter bad c201 1u /50v,c217 1u/50v, c101
10u/16v like pip module bad, but
TELEVISION hitachi 46ux12b dead/blows 5a line fuse shorted d901 full
bridge/d3sba60/nte530'?
TELEVISION HITACHI 46UX12B....AP33 RELAY CLICKS SET DOE'S NOT COME ON ZD
932 30V ZENER 2339231
TELEVISION HITACHI 46UX10BF Customer can't converge from remote control
Replace IC003 and IC004
TELEVISION HITACHI 46UX10BF Audio has a hum Leaky Q4013 and Q4008
TELEVISION Hitachi 46UX10BF Loss of color Check X501,C508, and M301
TELEVISION HITACHI 46UX10BA Slow to come on C916, C917, C921, C940,
C973, C974
TELEVISION HITACHI 46UX10BF Dead, hi voltage starts, shuts down, SMPS
squeals.
SMPS:C926(1uf@50),C939(10uf@50),C916&C917(47uf@25) )

TELEVISION HITACHI 46UX17K INTERMITTANT WON'T COME ON OR JUST DEAD REG.
IC STRM6511
TELEVISION HITACHI 46UX10BF Rolls 1st hour on. On Comb Filter Mod.
replace 2-10uf@50, 2-1uf@50SMD and solder MF001 Crystal
TELEVISION HITACHI 46UX17K NO SOUND REPLACE IC4001 PN 2004591 ON MTS BRD

TELEVISION HITACHI 46UX10BF PIP PICTURE VERTICAL ROLL PIP BOARD REPAIR
KIT AVAILABLE?MANY MODELS PN: X480125

Best regards --

Motorman