Member Avatar for engrjd91

i have an android phone.
Qmobile Noir A9...
my bottom touch keys are not working..
but when i connect a charger they probably works some how....

can some one tell me that whats the problem behind that ?

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Dani AI

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Brief diagnostic guidance for capacitive navigation keys that behave differently when charging: the symptom usually points to either a software issue (an app, a firmware glitch or corrupted system cache) or a hardware/electrical issue (capacitive-sensor grounding, charger/USB interference, loose ribbon or moisture). Start with safe, non-destructive checks and only move to resets or opening the phone if software steps fail.

Troubleshooting checklist:

  • Boot into Safe Mode (common Android shortcut: long-press Power, then long-press "Power off" to show "Reboot to safe mode" where available) to rule out third-party apps.
  • Test with different power sources and cables (original wall charger, a different wall charger, and a PC USB port). If the buttons only work with certain chargers, that strongly suggests a grounding or charging-circuit interaction.
  • Wipe the system cache from recovery (no data loss) before attempting a factory reset.
  • Back up personal data, then try a factory reset only if software diagnostics still point to a software fault.
  • If hardware is suspected: remove any screen protector or case, dry/clean the button area, and avoid DIY board-level repairs unless experienced. Common shop fixes include reseating/replacing the capacitive-button flex cable or repairing a failing touch controller.

Technical note: capacitive buttons sense changes in capacitance relative to the device ground. A charger can alter that reference or inject noise, making a failing sensor or poor grounding behave differently when connected.

Following 's line of thought, check recent installs and use Safe Mode first. As considered, a factory reset is a last resort after backup. If the problem persists across chargers and in Safe Mode, the issue is very likely hardware and requires repair.

Recommended Answers

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Member Avatar for BigPaw

What was the last app you installed before this started happening? If there isn't an app you can pin it down to, then it could be an update.

There's an app called "AppMgr III" that allows you to view your files by installation date, among other things. (somebody might be able something better, I've never needed to use this)

Member Avatar for engrjd91

i have designed my own application for my phone...
first i removed the privelege of installing apps outside from key store...
than i installed it....

that was the last app on my phone which i installed!

are you sure its not an hardware problem?
should i restore my factory settings?

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