Since no one, so to speak, could answer how to activate this source, I did not stay with my arms crossed and contacted a colleague from the capital and indicated how to test the source directly, and here I share the that need to do it, with certainty and security. A 10K resistor is placed between the PWR_ON pins and the pin that says 3.5v (that is, between power on and stand by). With this the source is activated, and the truth is yes, but there were no voltages of 12 and 24 I found several bad elements such as, Most Fet, SMD resistor, Input fuse, polyester capacitor, and other element principal . The fault was that only the voltage of 3.5v and not the voltages of 12v and 24v went out, therefore the TV only turned on the LED indicator and when given On it only turned off said indicator and did not turn on the TV, I hope this contribution serves, If someone out there needs values of the components changed with pleasure, I will give them to them.