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Nokia 5530 Xpress Music Ringer Solution

Related fix solution for : Nokia E73 No Network Signal Solution
Here's a solution for Nokia E73 with no network signal problem.

If ever tried to fix this problem, you must first restore, update the the device flash firmware before do a hardware repair attempt.
Nokia 5530  Ringer solution
If the problem still exist and confirmed that the problem is not on a flash firmware, you may then proceed to hardware troubleshooting.
The following solution below shows the RF circuit (radio frequency) of Nokia E73 mode PCB board layout, and being labeled to easily determine which part needs to check first.

Nokia E73 No Network Signal Solution

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The RF circuit is composed of chips or integrated circuit (IC). In troubleshooting RF signal problem you may need to have a frequency counter to make it easy to repair, but you may also fix it by doing it manually.
First, check the all supply voltages that feeds to each of the RF circuit chips like the RF power amplifier and RF IC.  There is an RF power supply controller that also feeds the secondary supply other than the battery supply voltage of 3.7 volts.

If these supply voltage is not present it means that the RF power management IC is faulty. rework or replace it if necessary.
If all the supply voltage is okay, check the RF clock oscillator or try to replace it.
If the clock is okay, rework the RF Power Amplifier (PA) replace if necessary.
And the RF IC will be the last chips needs to rework or replace for further troubleshooting.
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