Friends I commented that I already solved the fault in the source of the TV and it was perfect, after reading in several posts I was collecting information about the operation and the protections of this TV. Here I leave these data to be helpful and knowledge in case they have any similar fault. + Overcurrent B (OCP) It occurs when pin 48 of IC001 (A Board) detects an overcurrent on the line + B (135V). If the pin 48 voltage of IC001 (A Board) is less than 1V When V. SYNC is more than seven verticals in a period, the unit will turn off automatically. + Overvoltage B (OVP) It occurs when a maximum is felt on pin 2 of IC501 (A Board). I-PROT It occurs when pin 31 of IC301 (A Board) detects an absence of the vertical deflection pulse. The power supply will turn off when the waveform interval exceeds 2 seconds. IK (AKB) If RGB * levels do not balance within 2 seconds after the power is turned on, IC301 (A Board) will detect this error. The TV will stay on, But there will be no image. * (Refers to the RGB levels of the AKB detection reference pulse that detects 1K). Zero cross Verify that the collector Q691 (GK board) 7.5V STBY goes to 0V when the appliance is switched on. In my case the solution was in the latter, after checking the q691 and nearby transistors I found a transistor q605 (2SD774-T-3) in short, this works as a regulator with a zener in its base, after replacing it the source worked but with voltage variations and this led me to the avalanche diode D614 (EZ0150AV1) which I did not find and replace it with an R2KY and the TV was perfectly fine.