手机电流法（Mobile current method）.docVIP

手机电流法（Mobile current method） Typically, the current is 20 -- 30 -- 120 or 180 2. CPU (50ma) -- software work (60-100ma) -- search network (around 200ma) -- standby (10-20ma jump) 3. The normal cell phone starts from 50 to 150ma and the transmitting current is 150 to 250ma, and the standby current is 10 to 15ma. 4. MTK starting current 0mA, 20mA, 50mA, 40mA, 100mA 5. Without the card, the normal current of the cell phone receiving is 0mA (low), 50mA (middle), 180mA (high), 140mA (middle) shaking, and light extinguishing 20mA. If 140mA does not shake, the lamp will go to zero, the phone will not receive 6. The order of mobile phone work is power, clock, logic, reset, reception and launch 7. Under normal circumstances, and the key - background lights first - to rise to about 50 ma work the power supply has begun -- and then rose to about 100 ma show that electrical road work RX - rose to 200 to 250 ma RX and TX have job and looking for network - and then back to about 150 ma, find a network, which have not been in standby mode, but the background light is bright, and then put out, current back to 10 to 15 ma, back and forth to specific standby, the current changes can be observed, that mobile phone work normally 8. There is no current reaction on the power button A. Mainly check whether the starting line is broken. B. Replacement of 32.768 KHZ crystals. C. replant or replace the power IC. 9. Press the power button with 5 ma or so current A. Check the VRTC real-time clock power supply, if not most of the power IC damage. B. replant or replace the CPU. 10. The power-on current is only a few milliamps, and the hands return to zero. Generally, there are problems with the clock circuit, and the common problem is 26MHZ crystal virtual welding or damage! 11. About 10mA current is 13M main clock problem: first check 13M (or 26M) power supply, and the AFC control voltage (usually about 1.5v) Power supply and AFC normal replacement of 13M circuit should ensure that the rea