Charging Troubleshooting - Nokia 301 Service Manual

RM-839; RM-840; RM-841
BB Troubleshooting and Manual Tuning Guide
No current when pressing power on key

Charging troubleshooting

Troubleshooting flow
When inserting the USB adaptor into the phone, the phone will detect a valid voltage if charger output
voltage is 4V – 6.5V. Charging is enabled by SW when charger voltage is between 4V-6.5V. But if something
is wrong with the voltage detect/measurement circuit, then the phone cannot correctly identify the
charger.
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