iPad mini 1 slowly battery drain

I have an issue with my iPad mini 1: slowly battery drain (1% in 1 Hour). When the iPad on or off it is the same percentage battery drain. Without digitizer and screen is the same percentage battery drain. There is a Short in PCB but I don't know where. No Chip getting hot (maybe not hot enough to detect).

I turned off the iPad and I connect the battery connector to Power Supply the current goes to 0.05A and after 2 or 3 Seconds goes to 0A and then goes back to 0.05A and so on.

Please, can someone advise me where can I find the short?