Here's the Nokia X7-00 Solution for Not Charging Problem on the USB pin connector. This may help if the phone suffered wet damaged and resulted to no charging indication when the wall charger is plug-in.
Before proceeding, ensure that the battery and the battery charger are in good working condition.
- Check all the components shown on the image below, you may start by checking the USB pin connector.
- Then the fuse, diode, capacitors and filter coil for possible open or short circuit.
- Trace each of the connection line paths from USB pins down to the components where it is directly connected.
view larger image here
Now, if happens if the above parts were already been checked and seems all were okay, the next step is to determine if the battery sense resistor is working fine. see the image below.
You can check around 5V across on the R2200 resistor when the charger is plug-in. That resistor has a 10mOhms, you may replace it if found damaged.
Before proceeding, ensure that the battery and the battery charger are in good working condition.
- Check all the components shown on the image below, you may start by checking the USB pin connector.
- Then the fuse, diode, capacitors and filter coil for possible open or short circuit.
- Trace each of the connection line paths from USB pins down to the components where it is directly connected.
Now, if happens if the above parts were already been checked and seems all were okay, the next step is to determine if the battery sense resistor is working fine. see the image below.
You can check around 5V across on the R2200 resistor when the charger is plug-in. That resistor has a 10mOhms, you may replace it if found damaged.
view larger image here
The final option is working on the EM-IC (Power IC) if the above procedures doesn't solved the charging problem. You may try to rework first the ASIC chip, then replace if necessary and or after reworking on it doesn't still fix the problem. 
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