MITSHIBISHI VS50501 NO BLUE RASTER

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I have been working on a Mitshibishi VS50501.  The tv was dead.  I found a coolant leak and I drained, resealed and refilled the crt's.  I cleaned the circuit board and the tv came on.  Only the red and green crt's would come on.  The blue heater came on, but no raster.  Has anyone ran into this type of problem?  Thanks.