Nokia X7-00

Nokia X7-00 Not Charging Problem Solution

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.

Nokia X7-00 Charging components

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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.

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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.

Thursday

Nokia X7-00 Display Problem Solution

Here's a troubleshooting hints for Nokia X7-00 LCD Display problem such as blank display or no display at all and otherwise a corrupted or garbled display. This solution may help you for easy repair procedures.

Note: This only works if you can still hear something on the phone like tones, incoming alerts and not on a white screen problem or hang up on white screen situation.

The quick step to fix display problem, is that you have to verify a working LCD, just replace the LCD screen module at once just to ensure that the LCD is working or not and then proceed to hardware troubleshooting after confirming that the LCD is still fine. Just locate the highlighted components shows on figure solution picture below and do have a careful check up on each one of them one by one.

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- Check the display pin connector, clean it, rework or re-solder it if necessary.
- Check the capacitors and coils, replace if necessary, and then check the VBAT voltage and the VIO voltage on it. Those are the supply voltages for the display
- Check the two DSI line choke filters
- If those parts above already checked and seems nothing wrong, the problem possibly exist on the Display UI chip. Reworking or replacing it will only fix the display problem

For damaged or lifted display pin connector or due to wet or water damaged, here's the tracing guide if you might think that the problem lies on a broken display signal line paths.

view larger image here.