Tv doesn't come on

The brown stuff you see is excess flux and is not hurting anything,you need to check the horizontal output transistor for a short,sometimes this transistor goes bad because loose conections in the horizontal driver transformer and could have been intermitant,if the transistor is shorted it likely took the safety resistor that gives him the volts to operate.It seem you are familiar with tv service but some measurements need to be made with a meter to check for a short.If the transistor is bad it need to be replaced with an exact replacement,check for loose conection anyway very carefully,some are hard to see.