Tp.ms6486t.pb753 Schematic -

The main transformer outputs secondary voltages (typically and +24V/or backlight rail ). The 12V rail is further stepped down to power the digital logic components:

(1.1V–1.2V) and RAM (1.5V) rails after pressing the power button. If these do not appear, the processor is not sending the Power_On signal. tp.ms6486t.pb753 schematic