My father in-law brought me an old StarVision 15″ TV for me to fix the other day with no picture problem. I asked him where he got it from and he told me he got it from the Maritime college. One of the captains gave it to him. He told me to fix it so that he could watch it in his room.
Anyway I did a trouble shoot which I will tell you how to do. Switch on the TV and listen for the static rush that indicates that high voltage is present. It’s the voltage charge from the flyback transformer. Another way is to put your arm near the glass screen to feel if the hair on your skin will stand. See if the power light in front of the screen is on.
This TV did not have any static from the high voltage charge but the red power light or LED was on. That’s a good sign and it can be fixed quickly. Now you have to unscrew the cover off and take a look at the circuit board if any of the capacitors are swollen or signs of burns and heat. OK this board looked good.
At this stage you need to check if the line voltage to the Horizontal Output IC is 110 volts DC. You need a multimeter to perform a voltage test. Stick the black lead to a large heatsink on the board and the red lead to one of the points of the flyback primary winding just look for two big bolts of solder where the flyback is connected onto the board. The other eight solder joints are arranged in a semi circular formation. The line voltage is actually coming out of the large filter capacity. If you don’t read 110vdc and get 80vdc and below until you see a zero, then the 3 PIN IC is bagarap. That’s the ic connected to the flyback. It charges the flyback primary winding to produce the high voltage the screen needs to glow. There are several ways to check the components but I was lucky enough to find the solution. Sometimes it will take longer. Olsem yu yet.