Philips service mode tv flat with no damage to the black lines under and the longer growing upwards. First check the voltage supply B + 115v. vertical IC voltage 15V CT. video voltage 180v. all normal stresses, I continue checking on the physical condition yoke, and turn out ok. I check elco and resistors in series and the results smua vertical components in good condition.
I try to replace vertical ic but same result. I try to turn on the tv in a long time and there is a voltage difference v-int on cold and hot conditions, it seems there is damage to the mylar on v.int condensator 33n value that if the hot conditions its value decreases. I change and the results tv philips 21 "flat back to normal.
service manual philips tv