Have a Emerson TC2555D that has INSF . Width . Have no schmetic . Set was
DEAD . Replaced Q401 , STR30110 , C435 ,R521 , R507 , Solder R473 , R474

Some brands of STR30110 ICs do not work. For some odd reason, the output
voltage (pin 4 of the STR30110) is supposed to be 130v instead of the expected
110v. A bad new STR30110 will read 110v on pin 4 and cause low width. If this
is the case either try another brand, or try a STR30125, or 30130. Check
voltage on pin 4 to verify you are around 130v. Also make sure you used the
right value for R507 47 ohm.
Ron