TRICK REPAIR HANDPHONE to overcome defective cell phone signals

Problem: When we insert the SIM card and turn on the phone, then there is no signal or a network that appears on the phone LCD.Repair procedures:Check the first component of the antenna and antenna connector, make sure the well connected. Especially if your phone is a phone with the antenna, associated with the PCB or the mainboard through an elastic contact of two pointers, if the second pointer is in contact contact the ugly, the problem that arises is the lack of a network (no network) and a bad signal reception signals even lost (no signal). Especially with the engine knock or fall into the water, bad contacts and oxidation will occur at the contact pointer. Antenna switch is the only way to rnenerima and send a signal, if damaged or defective soldering of the pin, it would appear the problem is not the network or transmissionNext we tried to find the network on the phone with the manual method, if the method fails in this manual to find the network, so we can be sure there is a problem in RF IC (Hagar), replace the RF IC (Hagar) is then the problem will be completedNetwork can be searched by manual methods, but sometimes fail, not even able to connect well with the network. These symptoms are caused by problems of RF IC (Hagar), AUDIO IC (COBBA). If the module COBBA reveal the existence of errors, most likely was caused by his BGA soldering and units around the poor, or lack of current, while most problems Hagar units due to badIf searching for a network with the manual method on our cell phones only get 1 (one) operator / service provider cellular only, then there is a problem with IC VCO, replace the VCO IC is then the problem will be completedIf there is no problem with the manual method, check the flow path from the battery to the PA, if there is no problem with the next line we check whether the IC component of the PA to function properly. We can use multitester to test the PA, if PA was not functioning properly, we replace the PA is then the problem will be completedAfter testing and improvements to the hardware we do but the signal still does not exist / disappear, then we move on to the software. We flash phones according to the types of phones and phone software version before or with the newer software versions (upgrades)Unstable signal problems can sometimes be confusing when we are in need of phone functions which are calculated to make important calls. Signal problem is actually caused by two things namely, the quality of the signal from BTS carrier of the weak and the condition of the phone itself does have a problem in it. If the signal beam BTS does not have a problem at all then it could be ascertained, the problems are caused by cell phones.Phones that have problems with signals also have two possibilities. Problems guilty of software or hardware. The first step should be done is to make improvements to the software tuning signal. If after doing the tuning signal is still particularly a problem, then the last step is to make the turn on the switch components of the antenna, RF IC, PA, Audio and much more associated with weak cell phone signal.Switch antenna is weak, does not mean to do the turn. If it has very limited funds, then we can do the jumper switches the antenna without having to replace the PA.The equipment must be prepared in advance are:The following soldering tin 0.3 mmFluid FluxJumper cables 0.3 mm
SignalThe steps that must be done:Remove the casing of the phone to stay PCB / Board Cell PhonePrepare a jumper cable to be connected at the corresponding point on the image, precisely in PAIn the picture above, we do the jumpers on the phone 33XXAfter making jumpers, unite the parts back to normal phones.Mobile phones can now be used to capture a better signal.Trick antenna switch jumper this will affect the ability of dual-band mobile phone into one band, namely 900 MHz. This trick is very useful to get around the limitations of funds. If you do not want to lose the ability to dual-band mobile phone into a single band only, then the alternative is to make the turn with a new PA.Good luck, good luck.