OK I pulled the SAMS & its newer than the set I was thinking about.
C442 is probably the same part in yours.
ABL If I am wrong someone please correct me, its been YEARS !
Samples the low end of the HV winding. If the HV draws too much
current the ABL will pull down the video drive to prevent blooming etc.
Failure may cause low or no video or blooming, retrace etc.
BUT in 40 yrs I dont remember any problems there. Thats MANY thousands
of TV's !
For now keep in mind from Q401 on its direct coupled all the way to the CRT
so anything throwing off the DC voltages will be reflected down the line.
If it were me I would check transistors for leakage & voltages then
shot gun all the little 'lytics. Its a high parts count area so may be quite a challenge.
Good Luck
Zeno
LFOD !