The antenna of phone can be connected if correct

 The antenna of phone can be connected if correct.
Can then amplifier removed, and then two thin (approximately 10cm) were welded to the receiver front-end and transmit signal output (amplifier input of the VCO output), then dial 112 test machine, if you can play telephone, then the amplifier have a problem; or play no telephone, they should focus on examination of the IF IC and VCO. Emission current; as follows: dial 112 when you press the launch button, the current no change. This failure in the logic part, the general CPU no output TX-ON signal, the audio IC (CPU, IF ICs) without TX-l / Q signal output), chip (font) data does not, and audio ICs (CPU IF ICs) Weld can check each small part. If the cell phone signal is unnecessary to be blocked, the power supply switch of the host of phone should be shut off.
To the machine or boot to set the screen, or sometimes given version, and a mess of software failure, if you do not have the software you can use MTK48 programmer unlock method of repair of machinery, very simple, MTK unlock the address of friends should know, 4M, 8M, 16M, and so on. This repair method is to update the chip data, in general, the software under normal use conditions, are caused by the chip failure, so we adopt this solution to a fault caused by the chip data, this address to clear into the FF, then put it back pressing power chip data will re-establish, so that does not resolve? Placing position of phone should be correctly chosen to avoid the shielding dead zone.
But when you write the software to back up in case of bad with the fixed version when to have it fixed, can not make it not open, so back up, this CPU feature is very powerful, fault, one of the most common a boot low battery, then shut down. This failure causes the CPU battery detection feet do not get the battery data, that is the power of the CPU pick the measured foot to the battery + problem, and they are mostly connected by an exclusion (1004) , exclusion deterioration or false welding causes up to bad, the CPU board break. 6205 the power to pick up the measuring pin D6, A6 (charge capacity pick test) 6217,6218,6219 the power to pick the measured foot the D6, C6 (charge capacity pick test)]. The place of origin of phone is Guangdong.
MP3 phones sound classic kill failure all the head ringing amplifier Weld, a long time listening to music, the amplifier fever caused by Weld. The amplifier is very small glass film welding time to pay attention, remember the direction of the IC and the high temperature should be removed and then remove the plastic and then welding. MT series emission shutdown solutions to launch the shutdown, the first power source tone 4. 5V or so, try to see the launch will not shut shutdown if the shutdown, bad amplifier. If you do not shut down, the amplifier is not bad, personally think that should still be IF and CPU (personal meaning). The output of antenna of phone can be adjusted from 0 Watt to 3Watt for each antenna.