greetings I have this screen lg 32lx310 that came from another workshop with the faulty source in the diagrams that I got does not appear said plate whose number is TU78Q28B which has a zener diode in short (dz-505) and not its value changed the regulator and would like to know its original name (IC500) would like the help of someone who knows these values ​​or has the diagram thank you very much