Dead phone lights

Mobile no lights or led lights are not lit, then first we need to conduct inspections and testing of LED components and the track is lost or not. For testing we can do:

* We use a scale manually multitester xl on the LED legs, but with reversed poles with cables from our multitester, atrtinya: multitester red wire connected to the negative pole of the LED and the black wire connected to multitester positive pole of the LED
* When connected to multitester, if the LED components in good condition, then the LED will automatically light, if you damage the LED components, LED components can not be burned, so you need to replace your damaged LEDs by a new
* If all LEDs on the PCB is on your phone all the time you check and test by using multitester but when your phone switched on but the LED light still would not start then check whether the positive path () from the battery to the LED light is still good, if the track do cut jumper system on the disconnected lines then we check whether the path from the IC controller (IC UI) to the LED light is still good, if the line is broken then do a system jumpers on the break point was
* If the LED component and the path they are in good condition, but the phone still no LED lights, then try to check and test if the controller IC (IC UI) is still good, if it turns out Controller IC (IC UI) is still good, it is sufficient just panasi IC controller (IC UI) by using blowers carefully
* If your UI IC was the old one was damaged, then you need to change your phone UI IC with a new
* Turn on your phone, your phone will have LED lights again

Sim Card Problems:
IC Power Module (CCONT) works not only for power supply modules throughout the engine, but also the communication circuits between SIM card and the CPU. If the soldering is bad and damage in parts of the module IC Power (CCONT), a problem on the SIM card when the SIM card is inserted and the power is turned on, the message 'SIM card is not accepted', if the contact does not fit in the SIM card socket, display appears "Please insert SIM card '. Other damage that may occur:

* SIM card reader, check whether the plate on the SIM card is bent or dirty that can interfere with the SIM konseksitas of itself, change if you feel necessary
* Inspect and test the resistance and the SIM lines to ground, wharusnya value not less than 200kS
* Check and test whether VSIM voltage rises to 3 / 5 volts after turn on your phone. If the voltage matches VSIM but your phone can not recognize the SIM card, check whether the SIM lines connected to ground or cut off, also check the mechanical view of the driver's license reader. If the voltage increases in VSIM idak the expected value, replace the IC Power (CCONT). If still wrong after replacing IC Power (CCONT), probably due to path or broken PCB.
* If the "driver's license cards are not accepted" LCD display on your phone, but the setting is a SIM lock or no lock driver's license is set, then the IC Audio (COBBA) needs to be replaced. Remember that you must rewrite the data SIM lock and tune the value of Rx / Tx after replacing IC Audio (COBBA)