Hello friend franciscovallarta, thank you very much for your contribution, Yes, the source is exactly the same, I will measure those voltages and comment results
The voltage on the CNL 802 connector is 196 to 250 v (this is not uniform)
I disconnected the card and connected it alone
The previous voltages correspond to the source card that originally had the screen. The current card that I placed (the same number) has the following voltages: 13 v, 5.4v, and 186.5v, but it still does not turn on. What could be wrong? : The main, the Leds, or the Display ?, or the same source is the one that is failing. Regards!
Just to thank everyone in the forum who helped me with their valuable comments and at the same time I inform them that the problem was the LEDs, they placed it badly and were not correct. Thank you very much to all.