RX .TX CONNECTORS.
1 Find GND from phone.
2 Dead phone phone must be 80% software. We should power on phone and take multimeter put it to voltage.
3 multimeter (-) line put it GND and with (+) line check each connectors
, and usually Tx= 1.8v to 2.8v and Rx=1.7v to 2.7v
or
WHEN PHONE IS POWERD OFF TX AND GND WITH MULTIMETER MAKING BEEP
(DIOD TEST OPERATION), WHEN PHONE POWERED ON IT WILL SHOW LIKE DIOD
RESISTANS 600-700 OHM BETWIN TX AND GND
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