[edr1924]

I need to do more checking before asking...

I had read the post before you delete it... maybe I can help.

Things to check

- Does the system stops when the TFT is removed?

No, system continues to receive data from the TX board as seen here:

ESP8266 FW Version: AT+GMR  

busy p...
 
Mode station OK
Multiple mux OK
Join AP failure
WiFi connection is OFF
15:36:13 - Station ID: A1  Unit ID: 0  Sensor ID: 0  Full Message: A10000,947,F77,0,0,
15:36:15 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,47E,0,
15:36:18 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,49C,0,
15:36:19 - Station ID: A1  Unit ID: 0  Sensor ID: 3  Full Message: A10003,118,0,0,0,
SystemInit2 DONE!
Mode station OK
Multiple mux OK
Join AP failure
15:36:38 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,46A,0,
15:36:40 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,42E,0,
15:36:43 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,42E,0,
15:36:46 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,44C,0,
15:36:47 - Station ID: A1  Unit ID: 0  Sensor ID: 0  Full Message: A10000,948,F6E,0,0,
15:36:49 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,44C,0,
15:36:50 - Station ID: A1  Unit ID: 0  Sensor ID: 3  Full Message: A10003,118,0,0,0,
15:36:52 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,49C,0,
15:36:55 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,49C,0,
15:36:58 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,49C,0,
15:37:01 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,474,0,
15:37:04 - Station ID: A1  Unit ID: 0  Sensor ID: 0  Full Message: A10000,947,F77,0,0,
15:37:05 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,438,0,
15:37:08 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,49C,0,
15:37:11 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,456,0,
15:37:14 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,4D8,0,
15:37:16 - Station ID: A1  Unit ID: 0  Sensor ID: 5  Full Message: A10005,0,0,0,600,
15:37:17 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,21C,0,
15:37:20 - Station ID: A1  Unit ID: 0  Sensor ID: 2  Full Message: A10002,0,0,4D8,0,
15:37:21 - Station ID: A1  Unit ID: 0  Sensor ID: 0  Full Message: A10000,946,F74,0,0,


- Leave display MISO unconnected

is not connected...

- Start just with the BME280 (config software accordingly)

did that, no change

- Touch the 3.3V regulator. Is it running very hot?

no, can touch is without problems.

Rgs.


I will contact you for ordering a new RX board.